(PDF) Goodship v. Polyvinyl Alcohol.. Materials, Processing and Applications (RRR191, Smithers Rapra Press, 2009)(ISBN 184735095X)(141s)

Expert overviews covering the science and technology of rubber and plastics

ISSN: 0889-3144

Volume 16, Number 12, 2005

E. Ogur

Polyvinyl Alcohol: Materials, Processing and Applications

Report 192

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Item 1Macromolecules33, No.6, 21st March 2000, p.2171-83EFFECT OF THERMAL HISTORY ON THE RHEOLOGICAL BEHAVIOR OF THERMOPLASTIC POLYURETHANESPil Joong Yoon; Chang Dae HanAkron,University

The effect of thermal history on the rheological behaviour of ester- and ether-based commercial thermoplastic PUs (Estane 5701, 5707 and 5714 from B.F.Goodrich) was investigated. It was found that the injection moulding temp. used for specimen preparation had a marked effect on the variations of dynamic storage and loss moduli of specimens with time observed during isothermal annealing. Analysis of FTIR spectra indicated that variations in hydrogen bonding with time during isothermal annealing very much resembled variations of dynamic storage modulus with time during isothermal annealing. Isochronal dynamic temp. sweep experiments indicated that the thermoplastic PUs exhibited a hysteresis effect in the heating and cooling processes. It was concluded that the microphase separation transition or order-disorder transition in thermoplastic PUs could not be determined from the isochronal dynamic temp. sweep experiment. The plots of log dynamic storage modulus versus log loss modulus varied with temp. over the entire range of temps. (110-190C) investigated. 57 refs.

GOODRICH B.F.USA

Accession no.771897

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Previous Titles Still AvailableVolume 1Report 1 Conductive Polymers, W.J. Feast

Report 2 Medical, Surgical and Pharmaceutical Applications of Polymers, D.F. Williams

Report 3 Advanced Composites, D.K. Thomas, RAE, Farnborough.

Report 4 Liquid Crystal Polymers, M.K. Cox, ICI, Wilton.

Report 5 CAD/CAM in the Polymer Industry, N.W. Sandland and M.J. Sebborn, Cambridge Applied Technology.

Report 8 Engineering Thermoplastics, I.T. Barrie, Consultant.

Report 10 Reinforced Reaction Injection Moulding, P.D. Armitage, P.D. Coates and A.F. Johnson

Report 11 Communications Applications of Polymers, R. Spratling, British Telecom.

Report 12 Process Control in the Plastics Industry, R.F. Evans, Engelmann & Buckham Ancillaries.

Volume 2Report 13 Injection Moulding of Engineering Thermoplastics,

A.F. Whelan, London School of Polymer Technology.

Report 14 Polymers and Their Uses in the Sports and Leisure Industries, A.L. Cox and R.P. Brown, Rapra Technology Ltd.

Report 15 Polyurethane, Materials, Processing and Applications, G. Woods, Consultant.

Report 16 Polyetheretherketone, D.J. Kemmish, ICI, Wilton.

Report 17 Extrusion, G.M. Gale, Rapra Technology Ltd.

Report 18 Agricultural and Horticultural Applications of Polymers, J.C. Garnaud, International Committee for Plastics in Agriculture.

Report 19 Recycling and Disposal of Plastics Packaging, R.C. Fox, Plas/Tech Ltd.

Report 20 Pultrusion, L. Hollaway, University of Surrey.

Report 21 Materials Handling in the Polymer Industry, H. Hardy, Chronos Richardson Ltd.

Report 22 Electronics Applications of Polymers, M.T.Goosey, Plessey Research (Caswell) Ltd.

Report 23 Offshore Applications of Polymers, J.W.Brockbank, Avon Industrial Polymers Ltd.

Report 24 Recent Developments in Materials for Food Packaging, R.A. Roberts, Pira Packaging Division.

Volume 3Report 25 Foams and Blowing Agents, J.M. Methven, Cellcom

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Report 26 Polymers and Structural Composites in Civil Engineering, L. Hollaway, University of Surrey.

Report 27 Injection Moulding of Rubber, M.A. Wheelans, Consultant.

Report 28 Adhesives for Structural and Engineering Applications, C. O’Reilly, Loctite (Ireland) Ltd.

Report 29 Polymers in Marine Applications, C.F.Britton, Corrosion Monitoring Consultancy.

Report 30 Non-destructive Testing of Polymers, W.N. Reynolds, National NDT Centre, Harwell.

Report 31 Silicone Rubbers, B.R. Trego and H.W.Winnan, Dow Corning Ltd.

Report 32 Fluoroelastomers - Properties and Applications, D. Cook and M. Lynn, 3M United Kingdom Plc and 3M Belgium SA.

Report 33 Polyamides, R.S. Williams and T. Daniels, T & N Technology Ltd. and BIP Chemicals Ltd.

Report 34 Extrusion of Rubber, J.G.A. Lovegrove, Nova Petrochemicals Inc.

Report 35 Polymers in Household Electrical Goods, D.Alvey, Hotpoint Ltd.

Report 36 Developments in Additives to Meet Health and Environmental Concerns, M.J. Forrest, Rapra Technology Ltd.

Volume 4Report 37 Polymers in Aerospace Applications, W.W. Wright,

University of Surrey.

Report 38 Epoxy Resins, K.A. Hodd

Report 39 Polymers in Chemically Resistant Applications, D. Cattell, Cattell Consultancy Services.

Report 40 Internal Mixing of Rubber, J.C. Lupton

Report 41 Failure of Plastics, S. Turner, Queen Mary College.

Report 42 Polycarbonates, R. Pakull, U. Grigo, D. Freitag, Bayer AG.

Report 43 Polymeric Materials from Renewable Resources, J.M. Methven, UMIST.

Report 44 Flammability and Flame Retardants in Plastics, J. Green, FMC Corp.

Report 45 Composites - Tooling and Component Processing, N.G. Brain, Tooltex.

Report 46 Quality Today in Polymer Processing, S.H. Coulson, J.A. Cousans, Exxon Chemical International Marketing.

Report 47 Chemical Analysis of Polymers, G. Lawson, Leicester Polytechnic.

Report 48 Plastics in Building, C.M.A. Johansson

Volume 5Report 49 Blends and Alloys of Engineering Thermoplastics, H.T.

van de Grampel, General Electric Plastics BV.

Report 50 Automotive Applications of Polymers II, A.N.A. Elliott, Consultant.

Report 51 Biomedical Applications of Polymers, C.G. Gebelein, Youngstown State University / Florida Atlantic University.

Report 52 Polymer Supported Chemical Reactions, P. Hodge, University of Manchester.

Report 53 Weathering of Polymers, S.M. Halliwell, Building Research Establishment.

Report 54 Health and Safety in the Rubber Industry, A.R. Nutt, Arnold Nutt & Co. and J. Wade.

Report 55 Computer Modelling of Polymer Processing, E. Andreassen, Å. Larsen and E.L. Hinrichsen, Senter for Industriforskning, Norway.

Report 56 Plastics in High Temperature Applications, J. Maxwell, Consultant.

Report 57 Joining of Plastics, K.W. Allen, City University.

Report 58 Physical Testing of Rubber, R.P. Brown, Rapra Technology Ltd.

Report 59 Polyimides - Materials, Processing and Applications, A.J. Kirby, Du Pont (U.K.) Ltd.

Report 60 Physical Testing of Thermoplastics, S.W. Hawley, Rapra Technology Ltd.

Volume 6Report 61 Food Contact Polymeric Materials, J.A. Sidwell,

Rapra Technology Ltd.

Report 62 Coextrusion, D. Djordjevic, Klöckner ER-WE-PA GmbH.

Report 63 Conductive Polymers II, R.H. Friend, University of Cambridge, Cavendish Laboratory.

Report 64 Designing with Plastics, P.R. Lewis, The Open University.

Report 65 Decorating and Coating of Plastics, P.J. Robinson, International Automotive Design.

Report 66 Reinforced Thermoplastics - Composition, Processing and Applications, P.G. Kelleher, New Jersey Polymer Extension Center at Stevens Institute of Technology.

Report 67 Plastics in Thermal and Acoustic Building Insulation, V.L. Kefford, MRM Engineering Consultancy.

Report 68 Cure Assessment by Physical and Chemical Techniques, B.G. Willoughby, Rapra Technology Ltd.

Report 69 Toxicity of Plastics and Rubber in Fire, P.J. Fardell, Building Research Establishment, Fire Research Station.

Report 70 Acrylonitrile-Butadiene-Styrene Polymers, M.E. Adams, D.J. Buckley, R.E. Colborn, W.P. England and D.N. Schissel, General Electric Corporate Research and Development Center.

Report 71 Rotational Moulding, R.J. Crawford, The Queen’s University of Belfast.

Report 72 Advances in Injection Moulding, C.A. Maier, Econology Ltd.

Volume 7Report 73 Reactive Processing of Polymers, M.W.R. Brown,

P.D. Coates and A.F. Johnson, IRC in Polymer Science and Technology, University of Bradford.

Report 74 Speciality Rubbers, J.A. Brydson.

Report 75 Plastics and the Environment, I. Boustead, Boustead Consulting Ltd.

Report 76 Polymeric Precursors for Ceramic Materials, R.C.P. Cubbon.

Report 77 Advances in Tyre Mechanics, R.A. Ridha, M. Theves, Goodyear Technical Center.

Report 78 PVC - Compounds, Processing and Applications, J.Leadbitter, J.A. Day, J.L. Ryan, Hydro Polymers Ltd.

Report 79 Rubber Compounding Ingredients - Need, Theory and Innovation, Part I: Vulcanising Systems, Antidegradants and Particulate Fillers for General Purpose Rubbers, C. Hepburn, University of Ulster.

Report 80 Anti-Corrosion Polymers: PEEK, PEKK and Other Polyaryls, G. Pritchard, Kingston University.

Report 81 Thermoplastic Elastomers - Properties and Applications, J.A. Brydson.

Report 82 Advances in Blow Moulding Process Optimization, Andres Garcia-Rejon,Industrial Materials Institute, National Research Council Canada.

Report 83 Molecular Weight Characterisation of Synthetic Polymers, S.R. Holding and E. Meehan, Rapra Technology Ltd. and Polymer Laboratories Ltd.

Report 84 Rheology and its Role in Plastics Processing, P. Prentice, The Nottingham Trent University.

Volume 8Report 85 Ring Opening Polymerisation, N. Spassky, Université

Pierre et Marie Curie.

Report 86 High Performance Engineering Plastics, D.J. Kemmish, Victrex Ltd.

Report 87 Rubber to Metal Bonding, B.G. Crowther, Rapra Technology Ltd.

Report 88 Plasticisers - Selection, Applications and Implications, A.S. Wilson.

Report 89 Polymer Membranes - Materials, Structures and Separation Performance, T. deV. Naylor, The Smart Chemical Company.

Report 90 Rubber Mixing, P.R. Wood.

Report 91 Recent Developments in Epoxy Resins, I. Hamerton, University of Surrey.

Report 92 Continuous Vulcanisation of Elastomer Profiles, A. Hill, Meteor Gummiwerke.

Report 93 Advances in Thermoforming, J.L. Throne, Sherwood Technologies Inc.

Report 94 Compressive Behaviour of Composites, C. Soutis, Imperial College of Science, Technology and Medicine.

Report 95 Thermal Analysis of Polymers, M. P. Sepe, Dickten & Masch Manufacturing Co.

Report 96 Polymeric Seals and Sealing Technology, J.A. Hickman, St Clair (Polymers) Ltd.

Volume 9Report 97 Rubber Compounding Ingredients - Need, Theory

and Innovation, Part II: Processing, Bonding, Fire Retardants, C. Hepburn, University of Ulster.

Report 98 Advances in Biodegradable Polymers, G.F. Moore & S.M. Saunders, Rapra Technology Ltd.

Report 99 Recycling of Rubber, H.J. Manuel and W. Dierkes, Vredestein Rubber Recycling B.V.

Report 100 Photoinitiated Polymerisation - Theory and Applications, J.P. Fouassier, Ecole Nationale Supérieure de Chimie, Mulhouse.

Report 101 Solvent-Free Adhesives, T.E. Rolando, H.B. Fuller Company.

Report 102 Plastics in Pressure Pipes, T. Stafford, Rapra Technology Ltd.

Report 103 Gas Assisted Moulding, T.C. Pearson, Gas Injection Ltd.

Report 104 Plastics Profile Extrusion, R.J. Kent, Tangram Technology Ltd.

Report 105 Rubber Extrusion Theory and Development, B.G. Crowther.

Report 106 Properties and Applications of Elastomeric Polysulfides, T.C.P. Lee, Oxford Brookes University.

Report 107 High Performance Polymer Fibres, P.R. Lewis, The Open University.

Report 108 Chemical Characterisation of Polyurethanes, M.J. Forrest, Rapra Technology Ltd.

Volume 10Report 109 Rubber Injection Moulding - A Practical Guide,

J.A. Lindsay.

Report 110 Long-Term and Accelerated Ageing Tests on Rubbers, R.P. Brown, M.J. Forrest and G. Soulagnet, Rapra Technology Ltd.

Report 111 Polymer Product Failure, P.R. Lewis, The Open University.

Report 112 Polystyrene - Synthesis, Production and Applications, J.R. Wünsch, BASF AG.

Report 113 Rubber-Modified Thermoplastics, H. Keskkula, University of Texas at Austin.

Report 114 Developments in Polyacetylene - Nanopolyacetylene, V.M. Kobryanskii, Russian Academy of Sciences.

Report 115 Metallocene-Catalysed Polymerisation, W. Kaminsky, University of Hamburg.

Report 116 Compounding in Co-rotating Twin-Screw Extruders, Y. Wang, Tunghai University.

Report 117 Rapid Prototyping, Tooling and Manufacturing, R.J.M. Hague and P.E. Reeves, Edward Mackenzie Consulting.

Report 118 Liquid Crystal Polymers - Synthesis, Properties and Applications, D. Coates, CRL Ltd.

Report 119 Rubbers in Contact with Food, M.J. Forrest and J.A. Sidwell, Rapra Technology Ltd.

Report 120 Electronics Applications of Polymers II, M.T. Goosey, Shipley Ronal.

Volume 11

Report 121 Polyamides as Engineering Thermoplastic Materials, I.B. Page, BIP Ltd.

Report 122 Flexible Packaging - Adhesives, Coatings and Processes, T.E. Rolando, H.B. Fuller Company.

Report 123 Polymer Blends, L.A. Utracki, National Research Council Canada.

Report 124 Sorting of Waste Plastics for Recycling, R.D. Pascoe, University of Exeter.

Report 125 Structural Studies of Polymers by Solution NMR, H.N. Cheng, Hercules Incorporated.

Report 126 Composites for Automotive Applications, C.D. Rudd, University of Nottingham.

Report 127 Polymers in Medical Applications, B.J. Lambert and F.-W. Tang, Guidant Corp., and W.J. Rogers, Consultant.

Report 128 Solid State NMR of Polymers, P.A. Mirau, Lucent Technologies.

Report 129 Failure of Polymer Products Due to Photo-oxidation, D.C. Wright.

Report 130 Failure of Polymer Products Due to Chemical Attack, D.C. Wright.

Report 131 Failure of Polymer Products Due to Thermo-oxidation, D.C. Wright.

Report 132 Stabilisers for Polyolefins, C. Kröhnke and F. Werner, Clariant Huningue SA.

Volume 12Report 133 Advances in Automation for Plastics Injection

Moulding, J. Mallon, Yushin Inc.

Report 134 Infrared and Raman Spectroscopy of Polymers, J.L. Koenig, Case Western Reserve University.

Report 135 Polymers in Sport and Leisure, R.P. Brown.

Report 136 Radiation Curing, R.S. Davidson, DavRad Services.

Report 137 Silicone Elastomers, P. Jerschow, Wacker-Chemie GmbH.

Report 138 Health and Safety in the Rubber Industry, N. Chaiear, Khon Kaen University.

Report 139 Rubber Analysis - Polymers, Compounds and Products, M.J. Forrest, Rapra Technology Ltd.

Report 140 Tyre Compounding for Improved Performance, M.S. Evans, Kumho European Technical Centre.

Report 141 Particulate Fillers for Polymers, Professor R.N. Rothon, Rothon Consultants and Manchester Metropolitan University.

Report 142 Blowing Agents for Polyurethane Foams, S.N. Singh, Huntsman Polyurethanes.

Report 143 Adhesion and Bonding to Polyolefins, D.M. Brewis and I. Mathieson, Institute of Surface Science & Technology, Loughborough University.

Report 144 Rubber Curing Systems, R.N. Datta, Flexsys BV.

Volume 13Report 145 Multi-Material Injection Moulding, V. Goodship and

J.C. Love, The University of Warwick.

Report 146 In-Mould Decoration of Plastics, J.C. Love and V. Goodship, The University of Warwick.

Report 147 Rubber Product Failure, Roger P. Brown.

Report 148 Plastics Waste – Feedstock Recycling, Chemical Recycling and Incineration, A. Tukker, TNO.

Report 149 Analysis of Plastics, Martin J. Forrest, Rapra Technology Ltd.

Report 150 Mould Sticking, Fouling and Cleaning, D.E. Packham, Materials Research Centre, University of Bath.

Report 151 Rigid Plastics Packaging - Materials, Processes and Applications, F. Hannay, Nampak Group Research & Development.

Report 152 Natural and Wood Fibre Reinforcement in Polymers, A.K. Bledzki, V.E. Sperber and O. Faruk, University of Kassel.

Report 153 Polymers in Telecommunication Devices, G.H. Cross, University of Durham.

Report 154 Polymers in Building and Construction, S.M. Halliwell, BRE.

Report 155 Styrenic Copolymers, Andreas Chrisochoou and Daniel Dufour, Bayer AG.

Report 156 Life Cycle Assessment and Environmental Impact of Polymeric Products, T.J. O’Neill, Polymeron Consultancy Network.

Volume 14Report 157 Developments in Colorants for Plastics,

Ian N. Christensen.

Report 158 Geosynthetics, David I. Cook.

Report 159 Biopolymers, R.M. Johnson, L.Y. Mwaikambo and N. Tucker, Warwick Manufacturing Group.

Report 160 Emulsion Polymerisation and Applications of Latex, Christopher D. Anderson and Eric S. Daniels, Emulsion Polymers Institute.

Report 161 Emissions from Plastics, C. Henneuse-Boxus and T. Pacary, Certech.

Report 162 Analysis of Thermoset Materials, Precursors and Products, Martin J. Forrest, Rapra Technology Ltd.

Report 163 Polymer/Layered Silicate Nanocomposites, Masami Okamoto, Toyota Technological Institute.

Report 164 Cure Monitoring for Composites and Adhesives, David R. Mulligan, NPL.

Report 165 Polymer Enhancement of Technical Textiles, Roy W. Buckley.

Report 166 Developments in Thermoplastic Elastomers, K.E. Kear

Report 167 Polyolefin Foams, N.J. Mills, Metallurgy and Materials, University of Birmingham.

Report 168 Plastic Flame Retardants: Technology and Current Developments, J. Innes and A. Innes, Flame Retardants Associates Inc.

Volume 15Report 169 Engineering and Structural Adhesives, David J. Dunn,

FLD Enterprises Inc.

Report 170 Polymers in Agriculture and Horticulture, Roger P. Brown.

Report 171 PVC Compounds and Processing, Stuart Patrick.

Report 172 Troubleshooting Injection Moulding, Vanessa Goodship, Warwick Manufacturing Group.

Report 173 Regulation of Food Packaging in Europe and the USA, Derek J. Knight and Lesley A. Creighton, Safepharm Laboratories Ltd.

Report 174 Pharmaceutical Applications of Polymers for Drug Delivery, David Jones, Queen's University, Belfast.

Report 175 Tyre Recycling, Valerie L. Shulman, European Tyre Recycling Association (ETRA).

Report 176 Polymer Processing with Supercritical Fluids, V. Goodship and E.O. Ogur.

Report 177 Bonding Elastomers: A Review of Adhesives & Processes, G. Polaski, J. Means, B. Stull, P. Warren, K. Allen, D. Mowrey and B. Carney.

Report 178 Mixing of Vulcanisable Rubbers and Thermoplastic Elastomers, P.R. Wood.

Report 179 Polymers in Asphalt, H.L. Robinson, Tarmac Ltd, UK.

Report 180 Biocides in Plastics, D. Nichols, Thor Overseas Limited.

Volume 16Report 181 New EU Regulation of Chemicals: REACH,

D.J. Knight, SafePharm Laboratories Ltd.

Report 182 Food Contact Rubbers 2 - Products, Migration and Regulation, M.J. Forrest.

Report 183 Adhesion to Fluoropolymers, D.M. Brewis and R.H. Dahm, IPTME, Loughborough University.

Report 184 Fluoroplastics, J.G. Drobny.

Report 185 Epoxy Composites: Impact Resistance and Flame Retardancy, Debdatta Ratna.

Report 186 Coatings and Inks for Food Contact Materials, Martin Forrest, Smithers Rapra.

Report 187 Nucleating Agents, Stuart Fairgrieve, SPF Polymer Consultants.

Report 188 Silicone Products for Food Contact Applications, Martin Forrest, Smithers Rapra.

Report 189 Degradation and Stabilisation of Polymers, Stuart Fairgrieve, SPF Polymer Consultants

Report 190 Electrospinning Jon Stanger, New Zealand Institute for Plant and Food Research

Nick Tucker, New Zealand Institute for Plant and Food Research

Mark Staiger, University of Canterbury, New Zealand

ISBN: 978-1-84735-095-4

Polyvinyl Alcohol: Materials, Processing and Applications

Vannessa Goodship and Daniel Jacobs

RR191 Title page.pdf 1 13/8/09 15:27:59

Polyvinyl Alcohol: Materials, Processing and Applications

Contents

1. Introduction ................................................................................................................................................3

2. Application Scope ......................................................................................................................................4

3. Manufacture ...............................................................................................................................................6

4. Polymer Chemistry .....................................................................................................................................7

4.1 Viscosity in Solution ........................................................................................................................7

5. Water Solubility ........................................................................................................................................8

6. PVAL Film Properties ...............................................................................................................................9

6.1 Barrier Proporties .................................................................................................................................9

6.2 Other Film Properties .........................................................................................................................10

6.2.1 Mechanical Properties .......................................................................................................10

6.2.2 Plasticiser Effects ..............................................................................................................10

6.2.3 Oil and Solvent Resistance ...............................................................................................10

6.2.4 Water Sensitivity and Hygroscopy ...................................................................................10

6.2.5 Adhesion Characteristics...................................................................................................10

6.2.6 Antistatic ...........................................................................................................................10

7. Solution Processing ..................................................................................................................................10

8. Melt Processing ........................................................................................................................................11

8.1 Extrusion ........................................................................................................................................12

8.2 Injection Moulding ........................................................................................................................12

8.3 Film Moulding ...............................................................................................................................12

8.4 Blow Moulding ..............................................................................................................................13

9. Packaging .................................................................................................................................................13

9.1 Active Packaging ...........................................................................................................................13

10. PVAL in Medicine: Hydrogels ................................................................................................................13

11. Biopolymers .............................................................................................................................................14

12. Blends .......................................................................................................................................................15

13. Blends of PVAL .......................................................................................................................................15

13.1 PVAL-Starch Blends .....................................................................................................................15

13.2 Other Blends ..................................................................................................................................16

13.2.1 PVAL/Gelatin Blends .......................................................................................................16

Polyvinyl Alcohol: Materials, Processing and Applications

The views and opinions expressed by authors in Rapra Review Reports do not necessarily reflect those of Smithers Rapra Technology or the editor. The series is published on the basis that no responsibility or liability of any nature shall attach to Smithers Rapra Technology arising out of or in connection with any utilisation in any form of any material contained therein.

Author contact details: Vannessa Goodship WMG, Univeristy of Warwick, Coventry, CV4 7AL

Daniel Jacobs WMG, Univeristy of Warwick, Coventry, CV4 7AL

14. Degradability ............................................................................................................................................17

14.1 Biodegradable Plastics ...................................................................................................................18

14.2 Oil-Based Naturally Degradable Polymers ....................................................................................18

14.3 Photo-degradable Plastics ..............................................................................................................18

15. Plastics and Biodegradable Plastics Disposal ..........................................................................................19

15.1 Composting ....................................................................................................................................20

15.2 Incineration ....................................................................................................................................21

15.3 Landfilling ......................................................................................................................................21

16. Conclusion ................................................................................................................................................21

References ........................................................................................................................................................22

Abbreviations and Acronyms ..........................................................................................................................22

Subject Index ...................................................................................................................................................00

Company Index ................................................................................................................................................00

Polyvinyl Alcohol: Materials, Processing and Applications

Poly(vinyl alcohol): Properties, Applications and Disposal

This review report is produced to provide a concise introduction to poly(vinyl alcohol); the material itself, processing, applications and disposal. It will also consider comparable properties of similar materials with which this material is likely to compete. The definitions and requirements of materials that wish to operate in the ‘green’ arena will also be introduced.

Poly(vinyl alcohol) is the most commercially important water soluble plastic in use. It is tasteless, odourless, it will biodegrade and is biocompatible. As well as being soluble in water, it is slightly soluble in ethanol, but insoluble in other organic solvents. As environmental concerns over the disposal of plastic wastes have grown and focus has switched towards product life cycle and disposal, poly(vinyl alcohol) has a readymade and viable disposal route. In light of increasing environmental legislation, this will allow it to be utilised in non-traditional areas of use. With increasing interest in the use of biodegradable and sustainable alternatives for mass applications, poly(vinyl alcohol) provides an interesting point of comparative study on a oil-based synthetic material with the properties of a ‘green polymer’.

It is also be readily blended with a number of natural materials and can exhibit properties that are compatible with a range of applications. The inclusion of natural fibres and fillers can give further improvements in mechanical properties without compromising overall degradability. Therefore, the potential benefits of this material given its water soluble characteristics are huge, but this must be offset against practical considerations of its long term life cycle in changeable environmental conditions.

In the future biodegradable materials could be used within a variety of product applications, but there are, at present, significant penalties in terms of performance, cost and availability. The predominant benefit which can be attributed to biopolymer usage is that the materials themselves can be biodegradable. This of course makes them an increasingly attractive proposition for manufacturers who are faced with increasingly stringent EU legislative requirements when it comes to the environmental performance of their products, or those who wish to tap the market of the environmentally conscious consumer. This review will try to capture current and future trends in this area.

1. Introduction

Like all common polymers poly(vinyl alcohol) can be abbreviated. However, unlike polymers such as polypropylene (PP), in which the abbreviations are universally used, poly(vinyl alcohol) does not have a singularly recognised abbreviation. Therefore according to various literature sources it is referred to as PVAL, PVOH or PVA and therefore all these terms, although confusing, are correct in the context of the standards to which they were used.

The terminology that shall be used here is PVAL in accordance to British Standard BS EN ISO 15023-1:2006 (a.1).

Poly(vinyl alcohol) and its properties have been known to scientists for a long time. It was first prepared by Hermann and Haehnel, Germany, in 1924. It is made by hydrolysing polyvinyl acetate (PVA or PVAc – dependent on where you look).

Worldwide consumption of PVAL had reached several hundred thousand tonnes annually in 2006; this is widely predicted to increase by about 2.5% annually between 2006 and 2011. There are a number of worldwide producers of this material with the majority of production based in Asian countries. China has the largest share of the market as of commercial trading figures for 2006 with 45% of the entire market with this figure likely to expand. Japan and the United States are also both large producers and consumers of PVAL materials. Kuraray (Japan) is the largest single manufacturer of PVAL accounting for 16% of all world capacity and offering over 50 different grades of this material.

Trade names for PVAL (PVOH or PVA) include Elvanol (DuPont), Mowiol (Kuraray) and Poval (Kuraray).

The material exists in the marketplace as fully hydrolysed, medium hydrolysed or partially hydrolysed copolymers or custom blends. Most of the market is dominated by sales of the fully hydrolysed grade of material. This difference in hydrolysis will be explained in Section 4. In line with international standards, grades of this material are presented in terms of the degree of hydrolysis and the viscosity in water at specified conditions. An indication of the range of hydrolysis levels available in the marketplace is shown in Table 1.

Polyvinyl Alcohol: Materials, Processing and Applications

Using 2008 commercial prices as a general guide, PVAL materials are priced according to viscosity.

Low viscosity materials (classed as having a viscosity less than 0.01 Pa-s), were trading for half the price per tonne (150 Euros), than high viscosity materials (>0.03 Pa-s) which were trading at 300 Euros per tonne. Medium viscosity materials (0.01-0.03 Pa-s) were trading at 200 Euros. However, like all oil-based plastics prices are highly variable.

2. Application Scope

The major uses of PVAL depend on region. In the United States and Western Europe the majority of PVAL is consumed in the production of poly(vinyl butyral) (PVB). This is used in the inner layer of laminated safety glass for automobile window screens. It is made by reacting PVAL with butyraldehyde [CH3(CH2)2CHO] and this market is one which is expected to grow in the future.

PVAL finds other uses in a broad range of products produced for example as a protective colloid in the manufacture of polymer emulsions. Other applications include: the binding of pigments and fibres, dip coated articles, protective strippable coatings, the manufacture of detergents and cleansing agents, adhesives, emulsion paints, and solution cast film. These applications all involve the use of the PVAL in solution as its thermal degradation at about 150 °C (crystalline melting point of PVAL ranges from 180 °C to 240 °C), limits its ability to be used in conventional thermoplastic processing equipment without modification. When PVAL is plasticised, it

is possible to avoid thermal dehydration however, some properties are sacrificed.

In China the largest market is as a polymerisation aid in emulsified polyvinyl acetate and polyvinyl chloride (PVC). Therefore, much of the PVAL produced today is used as a protective colloid in the manufacture of polymer emulsions.

The use of emulsifying agents improves the quality of synthesis of PVC and helps properties such as the ability to absorb plasticisers and the production of uniform grain sizes. Other materials commonly used as emulsifying agents are methyl cellulose derivatives or combinations. Two PVAL materials of differing molecular weight may be used together synergistically improving the process.

In the formation of emulsified polyvinyl acetate, PVAL acts as a protective colloid. PVAL has excellent properties in emulsion such as ‘wet tackiness’, high strength and it is highly resistant to creep. As with the formation of PVC, the structure of the PVAL affects the emulsion performance of the polyvinyl acetate. For this process, PVAL with an active surface is also required, therefore partially hydrolysed grades are utilised which have residual acetate groups which are hydrophobic in nature.

In Japan Vinylon spun fibre is the biggest use of PVAL. It is used in a variety of applications from the manufacture of traditional Japanese dress, canvas, cement reinforcement, agriculture, fishing nets, ropes and paper making (which is the largest market). It can be produced by either dry or wet spinning. This is a different process to spinning from a melt, which is called melt spinning and used for production of fibres

Table 1 Selection of grades of PVAL offered by KurarayGrade Viscosity

DIN 53015 (a.2) (mPa-s)*

Degree of hydrolysis (saponification) (mol. - %)

Partially hydrolysed Mowiol 3-85 3.4-4.0 84.2-86.2

Partially hydrolysed PVA 220 27.0-33.0 87.0-89.0

Partially hydrolysed PVA 225 45.0-52.0 86.5-89.0

Medium Hydrolysed PVA CST 24.0-30.0 95.5-96.5

Medium Hydrolysed PVA 613 14.5-18.5 92.5-94.5

Fully hydrolysed PVA 117 25.0-30.0 98.0-99.0

Fully hydrolysed Mowiol 4-98 4.0-5.0 98.0-98.8

Fully hydrolysed Mowiol 56-98 52.0-60.0 98.0-98.8

*of a 4% aqueous solution at 20 °C

Polyvinyl Alcohol: Materials, Processing and Applications

such as polyethylene (PE), PP, polyamide (PA) and polyester. In the case of vinylon a spinning solution is used with most production then carried out by wet spinning. The product is staple fibre. The solution is spun into fibres which pass through a water bath before being drawn and cut into fibres. Dry spinning uses hot air instead of water, drawing and then collection of the filament yarn onto spindles. Vinylon is characterised by a lighter weight (specific gravity of 1.3) than natural fibres such as wool or cotton. It is abrasion resistant, durable and resistance to weathering, chemicals and rotting and has properties similar to cotton in fibre form.

Demand is also increasing for PVAL fibres as a safer replacement for asbestos fibres and in the use of polarising optical films for liquid crystal displays (LCD) (a.3). The PVAL material is used for optical applications which effectively prevent reflection of light at the surface of image display devices such as plasma display panels (PDP), cathode ray tubes (CRT) and LCD, and exhibits excellent scratch resistance. The film, used for preventing reflection of light has excellent scratch resistance and can be produced at a low cost. In a typical application, the film is formed by successively laminating a hard coat layer, a first high refractivity layer, a second high refractivity layer, and a low refractivity layer.

The water solubility and biodegradability of this material are the key properties for its usage. This has also attracted the recent attention of a packaging industry keen to address environmentally friendly solutions to the issue of plastic waste. This will be discussed in Section 5.

Other important areas where PVAL water solubility is used include textile sizing agents – the PVAL is applied to protect the textile fibres during production (such as knitting or weaving and so on), then once made the garment can be washed to remove the PVAL.

PVAL adhesives are used widely with cellulose materials as they give excellent adhesion to them. They are, therefore, used in a range of applications from postage stamps, labels, paper bags to book binding and make an ideal glue for papercraft activities.

Commercially, PVAL is the most important plastic for production of water soluble film. It is characterised by excellent film-forming, emulsifying, and adhesive properties. It has a high tensile strength, good flexibility, good oxygen barrier properties and good solvent resistance properties.

All the applications so far involve the use of the PVAL in solution as its thermal degradation is about 150 °C (crystalline melting point of PVAL ranges from 180 °C to 240 °C). Therefore until recently this limited its ability to be used in conventional thermoplastic processing equipment. However, when PVAL is plasticised, it is possible to avoid thermal dehydration. Melt processing applications are discussed in Section 8.

Therefore, PVAL finds use in variety of market sectors such as (a.3):

PVAL was investigated in the 1970s for use in controlled release of agrochemicals using combinations with pesticides. It is also used in current production of seed tapes. For these kind of applications the polymer must degrade without impact (be it chemical or biological) to the surrounding environment. Therefore, degradation and disposal issues will also be discussed later in the review.

PVAL is used in the manufacture of laundry bags and hamper liners for use in health care facilities. The filled bag is sealed shut with an attached adhesive strip. When placed in the washer, the adhesive and bag break down completely during the hot washing and disinfection. The bags are impervious to bacteria and viruses during normal use, as well as resistant to gases, solvents, and cool liquids, reducing the risk of contamination and thereby protecting hospital staff.

In food industries, PVAL is used as a binding and coating agent. The film coating is used in applications where moisture barrier protection properties are required. PVAL protects active components and other ingredients from oxygen, e.g., tablet coating formulations intended for products such as food supplement tablets.

Other more unusual products include the biodegradable PVAL pet waste bag for picking up pet waste and eco-disposal. It can be placed in the bin or flushed down the toilet. For lazy (or inept) golfers, there are water soluble golf balls made from PVAL. For golfers not willing to look for their balls, these can be abandoned on courses

Polyvinyl Alcohol: Materials, Processing and Applications

Figure 1 Molecule of PVAL (left) and chemical representations (right and centre)

to biodegrade naturally. For those who wish to practise their swings while at sea, they can be hit straight into the sea to dissolve.

This variety of sectors and applications areas are possible because poly(vinyl alcohol) has a number of useful and tailorable properties. It is odourless and non-toxic, it has excellent film forming, emulsifying, and adhesive properties. It also has good resistance to grease, oils and a large number of solvent materials. It has good mechanical performance with high tensile strength and flexibility, it also has high oxygen and aroma barrier properties. However, these properties are all dependent on the level of humidity. Water, which acts as a plasticiser, causes a reduction in tensile strength, but also increases the elongation and tear strength of the material.

The sheer range of applications for this material make it an interesting material of study. However, first a more fundamental introduction to PVAL manufacture and material properties will be given.

3. Manufacture

The first commercial production of PVAL was by the company Wacker (Germany) with the trademark Synthofil, which was used as medical sutures. In 1930, Japanese researchers Sakurada, Yazawa and Tomanari successfully wet spun PVAL. In 1950 this was realised commercially as Vinylon fibre (see Section 2). This fibre has high heat resistance amongst other interesting properties.

Unlike other members of the vinyl group, PVAL is not polymerised from a monomer in direct polymerisation, but prepared by hydrolysis of poly(vinyl acetate) (PVAc) in alcohol solution. This is a rubbery, synthetic polymer and partial or complete hydrolysis of the PVAc is used to prepare PVAL. The reaction proceeds via free radical mechanism or suspension polymerisation. Partial or complete hydrolysis removes acetate groups from the PVAc. The resultant material PVAL has the same degree of polymerisation as the original PVAc material. Therefore by varying the degree of polymerisation of the original PVAc a number of different grades of material with different properties can be produced. The reaction can be controlled to produce any degree of replacement of acetate groups. Other materials can be used to produce co-polymer materials which also replace the acetate group. Monomers such as ethylene and acrylate esters are commercially used in this way.

Once converted from PVAc the hydrolysed alcohol product is typically in the 87% to 99% range. If it is above 98% it can be considered to be fully hydrolysed with an expected crystallinity value of 40-50% Highly but not fully hydrolysed PVAL has a degree of crystallinity of 30-40% and a melting point of 225 °C. The reduced crystallinty in partially hydrolysed grades is due to the residual acetate groups. Other factors affecting crystallinity are the amount of plasticiser and water present in the compound. The production process used (acid or base catalysed) also has an effect. A lower crystallinity means lower strength but increased water solubility compared to fully hydrolysed (higher crystallinity) grades which can be considered as hom*opolymers as opposed to mixed vinyl acetate and vinyl alcohol copolymer. Chemical representations commonly used to represent PVAL are shown in Figure 1.

Polyvinyl Alcohol: Materials, Processing and Applications

4. Polymer Chemistry

The physical characteristics and specific functional uses depend on the both the degree of polymerisation and hydrolysis produced. PVAL is classified into classes namely: partially hydrolysed and fully hydrolysed.

PVAL is crystalline in nature, this is unusual since it is an atactic linear polymer, meaning the positioning of the side chains of secondary alcohol groups is random. This is generally accompanied by an inability to crystallise. In fact PVAc is not crystalline, but PVAL which contains smaller hydroxyl groups, is typically crystalline regardless of stereoregularity. This is because hydroxyl groups do not disrupt the crystalline lattice structure as their small size allows them to ‘slot’ in. However, in contrast, the presence of residual acetate groups greatly diminishes the crystal formation and the degree of hydrogen bonding because of their more bulky nature.

Therefore, polymers that are highly hydrolysed have a high tendency to crystallise and to undergo hydrogen bonding. As the degree of hydrolysis increases, the molecules will very readily crystallise, and hydrogen bonds will keep them associated if they are not fully dispersed prior to dissolution. At degrees of hydrolysis above 98%, manufacturers of PVAL advocate a minimum temperature of 96 °C to ensure that the highest molecular weight components have enough thermal energy to go into solution.

Increasing levels of hydrolysis leads to increasing crystallinity

This also allows a level of control to be exerted over the crystallinity produced and the physical characteristics and specific functional uses of PVAL vary with this property. The crystallinity affects the water solubility, strength, gas permeability and thermal characteristics. Since the crystallinity is dependent on both the degree of hydrolysis and the average molecular weight of the polymer it also depends on the degree of polymerisation that occurs.

The level of hydrolysis will therefore have a direct effect on the properties and it is necessary to distinguish these materials into levels (partially, medium, fully hydrolysed). The actual degree of hydrolysis depends on how many percentage mol of residual acetate groups remain, as PVAL is characterised by the presence of the polar OH groups in the structure. For ISO 15023 (a.1), the level must be equal to or above 70%.

Because PVAL refers to the material that can be both fully and partly hydrolysed, it can actually be considered in partially hydrolysed cases to be a co-polymer of vinyl acetate and vinyl alcohol monomer (which does not actually exist). The monomer components may be distinguished if necessary using the convention V-AL and V-OAc.

Therefore PVAL is characterised by the presence of polar alcohol (OH-groups), and these groups give rise to reduced water solubility and also allow other reactions to take place.

Increasing hydrolysis leads to:

In many cases, however, a partially or fully hydrolysed material may be used for the same application. For example in adhesives, where water resistance is required, a fully hydrolysed material may be used and where water resistance is not an issue, a partially or fully hydrolysed material may be used.

It is a water-soluble synthetic polymer that is it is made from petrochemicals. So although it is biodegradable, it is not a biopolymer. A biopolymer is a material made from a biomaterial such as plant starch. This distinction will be discussed in Section 10.

4.1 Viscosity in Solution

In water solution partially hydrolysed PVAL (88% and below) has a stable viscosity which does not change over time. However, the viscosity of a solution of highly hydrolysed material will show a gradual increase in viscosity over time, and if left long enough may even gel. This tendency to increase in viscosity over time, increases fairly linearly with concentration.

The films produced from partially hydrolysed solutions are characterised with poor water and heat resistance. Those from fully hydrolysed grades have the opposite properties being water and creep resistant properties. Through the use of additives it is possible to stabilise or destabilise those changes in viscosity which occur.

Polyvinyl Alcohol: Materials, Processing and Applications

5. Water Solubility

The main use of PVAL is when it is dissolved in water. Poly(vinyl alcohol) is among a group of water-soluble plastics that have a long history of use in niche applications. Many of these polymers are biologically stable when they are in the solid state but will biodegrade readily once they are dissolved. As PVAL is formed by hydrolysis of PVAc, by controlling the degree of hydrolysis, its solubility can be modified, which results in grades that will dissolve only in hot or cold water. Some grades can be mass produced by extrusion, injection moulding or film blowing (to produce potentially readily disposable components), but others must be cast from solution.

Single dose laundry blocks or liquids have become commonplace in many households. These are water soluble films used for the packaging (as you will find if you accidentally get them wet, they become very sticky.) Surprisingly the first use of water soluble packaging was in the 1960s, this was for carrying harmful chemicals in agriculture. It is relatively more recently that they have become such a commonplace item for household detergents and cleaning items.

As already mentioned, the solubility depends on a number of factors such as the degree of polymerisation and degree of hydrolysis. The degree of hydrolysis is particularly important because of the inherent chemical structure. The many hydroxyl groups mean it has a high affinity for water and the hydrogen bonding between the hydroxyl groups impedes the overall solubility.

In contrast, partly hydrolysed PVAL contains acetate groups. This acts in the opposite way to weaken the hydrogen bonding and increase solubility and there is a relationship between temperature of solubility and presence of acetate groups. Therefore, the behaviour of PVAL in solution is quite complex.

However, generally a partially hydrolysed version of the same material will be more soluble at a lower temperature with solubility increasing as hydrolysis levels increase.

Commercial water-soluble films can be tailored to dissolve in water at very specific temperatures.

PVAL is not the only water soluble polymer on the market. Other water soluble polymers are shown in Table 2.

Table 2 Water-soluble polymersType Production Source

PVAL Synthetic* Non-renewable*

Ethylene vinyl alcohol (EVOH)

Synthetic* Non-renewable*

Cellulose acetate

Natural Renewable (cellulose)

Chitosan Natural Renewable (invertebrates)

* made from fossil fuels

The term non-renewable source refers to the use of fossil fuels, which are finite in nature. PVAL and EVOH are highly unusual, synthetic crude oil-based polymers in that they dissolve in water. EVOH is most commonly used as an oxygen barrier layer in multi-layer film packaging (see Section 7.1) although it is expensive to use and the high price limits its applications elsewhere. PVAL is also the only polymer consisting of a carbon-carbon backbone that biodegrades. Polymers made from renewable resources include plant-based materials such as plant starch (which can be renewed by re-planting crops) and animals sources such as chitosan (found in insect exo-skeletons). Chitosan also has good gas barrier properties and is used as a coating for other biodegradable polymers and edible coatings. Both cellulose acetate and chitosan are water-soluble.

The water solubility of polymer materials means that they can end up as pollutants in water ecosystems (river, ocean) and affect aquatic life if they are not monitored and removed. Removal is done by microorg*sms for PVAL and other similar potentially water soluable pollutants include polyacylics, polycarboxylates, polyethers and polyglutamic. For PVAL, research as far back as 1936 (a.6) found that PVAL in waste water was biodegraded by a phytopathogenic organism of fungal origin, Fusarium lini. The by-products being water and carbon dioxide. Since then many studies have been carried out on PVAL degradation in both aerobic conditions and soil samples with satisfactory results. The actual biodegradation mechanisms are beyond the scope of this review however the reader is referred to a survey carried out by Chiellini and co-workers (a.7) in 2003 for an overview of this subject.

The solubility of PVAL makes a big difference to the final application. For example consider three alternative PVAL materials that can be considered as very soluble, moderately soluble and slightly

Polyvinyl Alcohol: Materials, Processing and Applications

soluble. A guide to potential applications based on this property is shown in Table 3.

Table 3 Solubility as application guideVery soluble Moderately

solubleSlightly soluble

Pharmaceutical capsules which dissolve to release drugs

Loose fill packaging

Food packaging

Medical sutures Agricultural films

Diaper films

Detergent single dose blocks

Single use food service items

Medical containers

Life span short Life span: medium

Life span: high – must survive until disposal

As we have seen, the solubility of PVAL depends on both the molecular weight and the level of hydrolysis. To add to this, PVAL that is partly hydrolysed is less dependent on temperature to be soluble. For highly hydrolysed grades however, it may be necessary for solutions to reach temperatures just under 100 °C before dissolution occurs. For disposal of items such as food packaging, diaper films and medical containers, left to degrade in the environment, it is unlikely that they would ever reach high enough temperatures to dissolve in rain water for example. It is therefore, necessary to consider whether degradation by environmental conditions or degradation by dissolving into water is the required outcome. Methods of degradation will be covered later in Section 14.

Partially hydrolysed PVAL is easier to dissolve than fully hydrolysed PVAL

6. PVAL Film Properties

PVAL is the most commercially important water soluble film, therefore, it is worth taking a look at the major properties of these materials.

Given their water soluble nature it is probably not surprising that the first consideration is that the resultant mechanical properties depend on humidity. High humidity produces a film which is soft and tough. Low humidity gives a hard and brittle material. These depend initially on the degree of polymerisation since tensile strength and elongation increase with degree of polymerisation

and partly hydrolysed materials are weaker than fully hydrolysed materials.

A higher degree of polymerisation gives increasing strength, but humidity has the effect of a plasticiser, swelling the structure to make it softer and tough.

6.1 Barrier Proporties

PVAL materials have excellent oxygen barrier properties (and also act as a barrier to carbon dioxide and nitrogen). These values are comparable to the performance of EVOH and much better than the common commodity packaging materials listed in Table 4.

Table 4 Oxygen permeability of common materials and PVAL (30 μm film, 50% humidity)

Material Oxygen Permeability (ml/m2/day)

Hot water soluble PVOH 0.24

Warm water soluble PVOH 0.36

Cold water soluble PVOH 1.85

EVOH 0.29-2.4

Nylon 6 26-38

PET 40-80

PVC 50-390

High-density polyethylene (HDPE)

1700-2400

PP 2,000-10,000

Low-density polyethylene (LDPE)

12,000

An increase in dissolution temperature (and crystallinity) improves the performance of the oxygen barrier. However, the downside is the affinity to water. Water vapour will permeate through the films and therefore PVAL is a poor barrier to water vapour. Interestingly this is the opposite of polyethylene which allows oxygen to pass through its structure but not water vapour. Wet PVAL film has little strength but a dry film has good tensile properties.

PVAL has found application as a barrier layer in flexible packaging but not in rigid packaging (such as bottles) where EVOH and PA are utilised. Whilst aluminium of micrometer thickness is traditionally used in flexible packaging, creating a virtually perfect barrier, using plastics by lamination or co-extrusion gives high (but not perfect) barrier performance but at a better cost

Polyvinyl Alcohol: Materials, Processing and Applications

performance. Other flexible packaging barrier materials used in this way include poly(vinylidene chloride) (PVDC), EVOH or PA.

However, it needs to be considered that PVAL, EVOH and PA are only effective barriers in a dry state. Therefore, sandwich constructions in which they are protected by materials with water barrier properties are necessary to maintain the oxygen barrier properties of these materials.

6.2 Other Film Properties

6.2.1 Mechanical Properties

Degree of polymerisation affects both the tensile strength and elongation film properties, so that as the degree of polymerisation increases so does the strength. The tensile strength also increases with a rise in the degree of hydrolysis.

However, as well as these factors, the humidity also has a marked effect on physical properties.

At low humidities, PVAL film is hard and brittle, whilst at high humidity it is soft and flexible due to the plasticising effect of the water vapour. This dependence is greater for partially hydrolysed grades than for those that are fully hydrolysed.

Humidity leads to increased flexibility and softness.

6.2.2 Plasticiser Effects

Water acts as a plasticiser for PVAL whether by the action of humidity or as a solution. At low humidities the same effect can be achieved by glycols which serve to prevent the PVAL film from becoming hard and brittle. For thermal processing techniques such as injection moulding it is necessary to add plasticiser to prevent premature degradation. These will be discussed further in the thermal processing section.

6.2.3 Oil and Solvent Resistance

PVAL is highly resistant to oils (animal, vegetable or mineral origin) and organic solvents (aromatic and aliphatic hydrocarbons, esters, ethers and ketones). This resistance like many of the other properties of PVAL is

affected by the degree of polymerisation and the degree of hydrolysis.

6.2.4 Water Sensitivity and Hygroscopy

PVAL films will swell and take up water if immersed. Partially hydrolysed grades have higher levels of hygroscopy and solubility to water vapour than fully hydrolysed grades.

These factors and the rate of swelling can all be decreased by heat treatment which increases the crystallinity of the film.

6.2.5 Adhesion Characteristics

As the degree of hydrolysis increases there is a change in the relative number of acetate and hydroxyl groups present. This in turn creates changes in the adhesion character of the film.

When used as an adhesive agent, low degrees of hydrolysis give adhesion to hydrophobic surfaces, higher degrees of hydrolysis lead to adhesion to hydrophilic (strong affinity for water) surfaces.

6.2.6 Antistatic

PVAL is resistant to static build up and this property can be useful in packaging applications where atmospheric dust is present.

7. Solution Processing

The spinning of Vinylon fibres from solution, primarily of interest only to the Japanese market has already been discussed. Another process using PVAL in solution to spin fibres is electrospinning. In this case very thin, nano-sized fibres can be produced, allowing the resultant fibres to be used in a range of medical and filtration applications. The major drawback with electrospinning is the volumes that can be produced. If large volume equipment comes onto the market, this type of manufacture could be applicable to more than just niche markets.

Since many applications described here are carried out in solution, it is worth considering how these

Polyvinyl Alcohol: Materials, Processing and Applications

solutions are made. These methods can also be used to differentiate between a fully hydrolysed and partially hydrolysed grade.

It has been shown that the solubility is dependent on two factors, degree of polymerisation and hydrolysis. Fully hydrolysed grades are not really soluble at room temperature so a stirred water/PVAL mixture will need to be heated to nearly boiling to ensure full dissolution.

For partially hydrolysed grades, the plasticiser effect of the water and solubility means the solute (PVAL in this case) tends to form lumps if prepared in the same way as fully hydrolysed grades, therefore in this case, the PVAL should be added slowly to the solution whilst stirring. The temperature can be raised if necessary to speed this process up.

Whilst solution concentrations obviously vary from application to application, a 10% solution is a very common dilution rate for PVAL and can therefore be considered as an indicator of the levels of PVAL used in solution for the purposes here.

8. Melt Processing

PVAL has a decomposition temperature of 180 °C. However it does not melt below 180 °C, and has a melting point range of between 180 and 240 °C. Some properties are shown in Table 5. Therefore thermal processing of PVAL presented a considerable challenge worldwide.

Table 5 Properties of PVALProperty Typical value

Density 1.19-1.31 g/cm³

Melting point 180-240 °C (dependent on degree of hydrolysis)

Boiling point 228 °C

Degradation temperature (unplasticised)

180 °C

Unplasticised PVAL degrades at temperatures above 180 °C due to water elimination from the chemical structure. Further degradation can cause discoloration and crosslinking to occur as the hydroxyl and acetate side groups are eliminated. Whilst the melting point of PVAL can vary between 180-240 °C depending on the level of hydrolysis, the effect of the relatively

low degradation reaction temperature means that melt processing applications a limited to only materials with low hydrolysis levels or materials that a heavily plasticised (which generally meant sacrificing the useful properties inherent in the PVAL materials in the first place).

Therefore, until the last decade, the unwelcome onset of thermal and shear degradation during melt processing of PVAL limited the use of conventional thermoplastic melt technology. Application of PVAL was limited to aqueous solutions and cast films. However, advances in PVAL polymer formulation mean that the properties of PVAL can now be retained during thermoplastics processing and it is possible to produce water-soluble, non-toxic, biodegradable plastics by conventional thermoplastics forming techniques. A brief description of some of these techniques follows.

Extrusion

Process for producing either pellets for other heat forming processes such as injection moulding, sheets (which can also be used for thermoforming) or profiles such as tubes, pipes and rods.

Film blowing

Process for producing thin films products such as shrink wraps and carrier bag film.

Injection Moulding

High shear and pressure process for production of complex and mass produced components such as mobile phone covers, lids, automotive door handles, motorcycle helmets.

Thermoforming

Low pressure process which deforms sheet material into relatively simple shapes such as trays, cups and shallow tubs.

Blow Moulding

Inflation production process which produces hollow articles such as bottles, containers and tanks.

Melt spinning

Production of thin fibre strand produced from molten plastic passed through a multi-holed profile. (This is not to be confused with spinning from a solution, as in the production of Vinylon fibre or electrospinning which produces PVAL nano-fibres and is also a solution process.)

Polyvinyl Alcohol: Materials, Processing and Applications

PVAL melt processing temperatures tend to range between 180 and 240 °C. This depends on the level of hydrolysis and specific formulation and additives used. Generally fully hydrolysed grades, which have higher melting points, require higher temperatures to be used. They also tend to be harder to process. To improve the processibility of PVAL it is necessary to use a plasticiser and lubricants which lower melt temperature and viscosity and therefore allow lower processing temperatures to be utilised. The degree of degradation is strongly influenced by acetate groups which liberate acetic acid during processing which catalyses further degradation to occur. Higher levels of hydrolysis 98 mol% are more resistant to degradation that 88 mol%. Temperature rather than shear appears to be a dominant factor in this.

In such applications, the basic PVAL must be plasticised so as to reduce its melting point, and obtain a thermal processing window for processing. In general plasticisers, such as glycerol, polyethylene glycol, sorbitol and other compounds have been used.

Mowiflex TC is an example of a thermoplastic melt processable material currently sold by Kuraray. This can be used to produce blown and sheet film as well as injection moulded components. As expected of PVAL, it is moisture sensitive and sold in moisture resistant bags, however, it can be dried if needed at 60-80 °C for 6-8 hours using conventional air drying equipment. Therefore, it can be treated like other moisture sensitive materials such as Nylon routinely used in processing.

8.1 Extrusion

Tubing and hoses produced by extrusion retain many of the properties recognisable from solution processing. They are highly flexible and retain excellent solvent resistance to oils, greases and other chemicals.

Processing is carried out on standard extruders with low residence times. Keeping residence times as low as possible is one key factor in successful processing of PVAL materials. Thermal damage produces discoloration of PVAL products, as it does with many other thermoplastic components.

8.2 Injection Moulding

For injection moulding of PVAL, recommended mould tool temperatures are in the 70-80 °C range with melt temperatures ranging from 190-220 °C. This is similar

to parameters used to process polyethylenes. This can be performed on conventional equipment using hot or cold runners to produce a variety of moulded components. With the fast cycling time possible with injection moulding it is possible to mass produce a variety of components and products very rapidly and economically.

An example component is exhibited in the Science Museum, London, UK. This is a biodegradable mobile phone casing developed by researchers at the University of Warwick's, Warwick Manufacturing Group, in conjunction with PVAXX Research & Development Ltd. A water soluble mobile phone case was the component. However, this idea had a twist. By imagining the components end-of-life and burying the case after use with a sunflower seed beneath it, the phone biodegraded and the sunflower seed began to grow and eventually flowered. This was timed with the growing awareness of the problem of plastic waste and sustainability, as well as the newly introduced European Union WEEE Directive (waste electrical and electronic equipment) (a.8) which covered the ever growing problem of electrical waste. Therefore, discarded mobile phones were a hot topic and this application captured public attention. However, problems of water proofing the product for use (in rain or wet environments for instance), mean as yet this application is not in commercial production.

8.3 Film Moulding

An extrudable PVAL material for blown film application was marketed by A. Schulman, Akron, USA under the name Aquasol. It is reported to have the same physical properties as the cast film and could be used in conventional polyolefin melt equipment. The target market to be biodegradable replacement for LDPE (a.9). Most of the market in these film applications is for disposable packaging.

Table 6 shows a typical range of properties shown by various grades of PVAL in comparison to other film materials. Most marked here is the tear strength and tensile strength which is actually comparable to that produced by a polypropylene material. PVAL materials also show good puncture resistance and impact strength. However performance is markedly affected by the degree of hydrolysis and therefore the crystallinity of the base material as well as the molecular weight, distribution and branch structure.

Polyvinyl Alcohol: Materials, Processing and Applications

Blow up ratios may vary according to supplier of PVAL material. According to Kuraray, the grade Mowiflex TC can achieve a blow up ratio (inflation ratio) of 1:8.

8.4 Blow Moulding

While PVAL can be used as a barrier layer in multi-layer bottles, generally EVOH is used for rigid packaging applications as produced by blow moulding. For example, with PET bottles, EVOH can be used as a barrier layer to keep the carbonated contents fizzy. Another commonly used barrier layer is PVDC, however, the use of these materials as packaging materials is generally declining due to environmental issues. Therefore other materials such as EVOH, PVAL, coated PP films, Nylon resins called MXD6, and PET films which are silica- or alumina-coated are becoming more popular for gas-barrier purposes.

Recently, various types of oxygen scavengers have been developed and applied as active packaging materials. In fact, PET bottles having oxygen barrier or scavenging properties are now used in the production of plastic beer bottles in Europe and the United States.

Because of the environmental interest in the problems of plastic waste disposal and the inherent solubility and biodegradable nature of PVAL, interest in this material has heightened for these processes which are capable of high production rates.

9. Packaging

Biodegradable packaging is a direct response to the problem of waste packaging and disposal using petroleum-based synthetic plastics. Material performance and cost are the main barriers to increased biodegradable market share as consumer acceptance

of these materials is growing. Legislative demands for sustainability and biodegradable disposal such as composting are also drivers towards the use of biodegradable materials (see Section 15). The major problem with waste packaging here has to do with product life cycles. Packaging materials have expected lifetimes which are very short – days or weeks. A plastic used in construction on the other hand, such as PVC window frames are expected to last for decades. Therefore, discarded packaging makes up a considerable proportion of the plastic waste stream. This is therefore an ideal outlet for biodegradable plastics which can be used for packaging items such as food films, single use food containers, disposable plates and cutlery and bottles. These products can be mass produced through processes such as injection moulding, blow moulding and film blowing if cost effective and reliable supplies of biodegradable materials are available. However, this is not always the case.

9.1 Active Packaging

Active packaging is where a packaging system actually does more than simply package food. One such example would be to transfer antimicrobal agents from a carrier film and into the food to maintain a predetermined and useful concentration to help with food safety or food preservation for example. For such purposes, properties such as diffusion, polymer swelling and dissolution are important. The properties of PVAL make it a polymer of interest for such new applications. Antimicrobotic release systems described here have until now mainly been used in medical and pharmaceutical applications.

10. PVAL in Medicine: Hydrogels

Hydrogels are 3-dimensional crosslinked hydrophilic polymer networks which do not dissolve in water

Table 6 Properties of PVAL and common films at 25 μmProperty PVAL Cellophane PVC LLDPE OPP

Light transmission (%) 60-66 58-66 48-58 54-58 70-86

Light reflected (%) 81 60 80 22 80

Tear strength (Elmendorf) (g/mil) 260-3000 20-40 390-780 290-980 4-6

Tensile Strength (MPa) 40-90 55-131 20-76 17-19 25-30

Elongation at break (%) 110-400 - 5-250 50-600 70 -100

LLDPE – linear low-density polyethylene OPP – orientated polypropylene

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at body temperatures but swell when exposed to an aqueous medium (a.5).

PVAL is one of the most well known hydrogel materials and can be caused to crosslink as required. PVAL has good biocompatilbility and this has meant it has found application in a variety of medical applications including contact lenses, implants, drug delivery systems, medical implants and also wound dressing.

Hydrogels in wound dressings can incorporate useful features such as pain control, ease of changing, transparency to allow monitoring of healing, absorbtion and prevention of fluid loss, bacterial barriers, good oxygen permeability, and good handling or control of drug dosage. Hydrogels provide an interesting comparison to the field of active packaging whereby the packaging is also incorporating useful features.

As a biocompatible material PVAL is also of interest for surgical grafts and implants as well as medical devices.

11. Biopolymers

Biopolymers is short for biological polymers. These are polymers which occur in nature produced by microorganisms, plants and animals.

In the 1970s, the first impacts of the energy crisis began to focus the development of alternatives to traditionally employed materials. The response was to begin active research in the area of biopolymers. As early as the 1980s, the main advantage for using biopolymers became their capacity to decompose under natural

conditions. Continued apprehensions regarding the increased cost of crude oil due to the uncertainty of global supply is compounded by the ongoing concerns regarding the current political climate. These drivers have forced manufacturers and government to consider alternative solutions to reduce dependence upon oil. Bio-based alternatives to fossil fuel feedstocks are growing across the globe, and the growth in biopolymer development is finding increased favour within many industrial sectors. Improvements in economies of scale and sales growth of between 20-30% per year would indicate that biopolymers may soon be competing with commodity polymers (a.17).

Therefore, biopolymer itself is a term which can be used to describe a wide range of materials. There are two categories into which a material can fall in order to be classified as such:

material or

Carbohydrates, proteins and polyesters (which are produced by microorganisms) are all found abundantly in nature. Not surprisingly, these materials are all naturally biodegradable. Common examples of each is shown in Table 7.

There are a large variety of materials which can be categorised as a biopolymer. These often take on other names such as low environmental impact polymers, or green polymers, but for the purposes of this report, the term biopolymer shall be used. Within the category of polymers which are produced from bio-feedstocks, there are three types of biopolymer - those which are

Table 7 Examples of polymers in natureBiopolymer Plants sources Examples Animal source Example

Carbohydrates Polysaccharide Cellulose Starch Chitin

Glycosaminoglycans Hyaluronan

Proteins Amino acids Soy protein Wheat gluten

Amino acids Collagen Casein Keratin

Polyesters Produced by bacteria Lactic acid – found in microorganisms and animals

PHA Polymerisation of lactic acid makes poly(lactic acid) (PLA)

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naturally occurring within the environment (including those from polysaccharides, polypeptides and lipids), those which are manufactured synthetically - i.e., they are man made biopolymers in an attempt to address the problems and issues which are currently being faced, and then hybrid, composite materials which are beyond the scope of this review. There are opportunities to employ petrochemical based materials in order to develop a hybrid composite which can extend product ranges and enhanced competitiveness.

Increase in the production, and subsequent use of biopolymers could be attributed partly to the increasing awareness of the damage to the environment caused through the use of fossil resources, which are widely recognised as being a finite feedstock (a.18). Security of supply, particularly within the current political and economic climate is another significant factor.

Some natural polymers can also be extracted and chemically modified to produce thermoplastics. For example, Polymerisation of lactic acid makes poly(lactic acid) (PLA).

With the exception of poly(lactic acid) (PLA) these polymers are all naturally produced by nature. In the case of PLA, a monomer from nature, lactic acid, is polymerised by man to produce PLA. So it could be argued that this is a type of synthetic material however, it retains its biodegradability and has a renewable source. It is therefore generally considered to be a biopolymer. Therefore this section also includes polymers from renewable resources that can be polymerised to create biopolymers that are biodegradable and may be naturally produced or synthetically produced.

Biopolymers may be synthetic or naturally occurring in origin, but in order for them to be of significant benefit to the manufacturing sector they have to be competitive on financial, performance and also availability criteria.

To switch from a biopolymer to a bioplastic it is necessary to add additives, just like conventional polymer to plastic processes. Therefore, bioplastics are plastics manufactured using biopolymers with other additives, however, they do not necessarily retain the biodegradability properties of the biopolymer.

The major advantage of using biodegradable materials is that they can be naturally diposed of through processes such as composting. But the biodegradability of raw materials does not necessarily mean that the product or package made from them (e.g., coated paper) is itself compostable.

However, there is widespread interest for biopolymers and bioplastics among consumers. The public perception is that conventional plastics are environmentally unfriendly. The brand of ‘sustainability’ can provide an image benefit. However, for manufacturers the environmental benefits of biodegradable packaging must be reflected in cost advantages, if large scale applications are to become feasible. Therefore, in the short term, it may be preferable to communicate the functional advantages of biodegradable packaging rather than its compostability.

Biopolymers can have advantages for waste processing. Coated paper (with for example, polyethylene) is a major problem product for composting. Although such materials are usually banned from inclusion in organic waste under separate collection schemes, some of them usually end up in the mix. The paper decomposes but small scraps of plastic are left over in the compost. The adoption of biopolymers for this purpose would solve the problem.

Whether the use of a bioplastics will contribute to a more sustainable society is a question that will have to be studied by a representative life cycle analysis (LCA) of each application and by comparison with existing applications. Representative LCA are needed at material and product levels; they must make allowance for future developments in biopolymers and take account of all relevant environmental impacts associated with the complete product life cycle, including the depletion of raw materials, the agricultural use of fertilisers and pesticides, transportation, utilisation and waste disposal. Biopolymers can be categorised as either:

Naturally occurring

Naturally occurring biopolymers are those which are formed organically by the earth's natural resources, with the most common natural biopolymers being derived from starches and celluloses. Starch is found in corn, potatoes and wheat and is therefore offers a potential opportunity for farmers wishing to develop non-food crops. Cellulose is the most plentiful carbohydrate in the world. Natural biodegradable polymers are generally produced in nature by all living organisms and as a class, they represent truly renewable resources since they are predominantly biodegradable, even if this process is slow as they are produced in nature (a.20). The synthesis of these materials involves enzyme-catalysed, chain growth polymerisation reactions of activated monomers, which are typically formed

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within cells by complex metabolic processes (a.19). Predominantly these polymers are formed from one of the three following categories:

These protein materials tend not to be soluble, so they are more often employed in their natural form. Prime examples of these include wool, silks and collagens. Gelatin, however, is a water-soluble biopolymer and as such has significant implications for use within a number of industries, particularly pharmaceutical and medical applications.

celluloses, etc)

Polysaccharides include the biopolymers which can be categorised as starch, cellulose and chitin based. Cellulose and starch based biopolymers have attracted the most interest due to their wide availability and relative low cost, but other complex carbohydrates are also of interest.

Starch is the primary carbohydrate reserve in both plant tubers and seed endosperm. The largest source of starch worldwide is from maize, but other contributors to the starch stocks include wheat, potato and rice. It is an attractive proposition to biopolymer developers due to its abundant stock and subsequent low cost. Starch films have been employed particularly within packaging films, and the biopolymer Mater-Bi, manufactured by Novamont is predominantly starch-based. Corn starch is the raw material from which poly(lactic) acids (PLA) are derived. Thermoplastic starch and starch blends such as with PVAL and aliphatic polyesters are available.

Naturally produced polyesters including PVB, polyhydroxy butyrate (PHB) and poly(hydroxybutyrate-co-hydroxylvaleratevalerate) (PHBV).

Celluloses are also well represented within nature in amongst other forms, wood and paper. Cellulose is a polysaccharide as it is derived from sugars - it is repeated units of the monomer glucose. Cellulose biopolymers have been used for packaging particularly for confectionery and cigarettes.

Chitin is a naturally occurring material found in the animal kingdom, in the shells of crustaceans and insects. In its original form, chitin is not soluble, but chitosan (partly deacetylated chitin) is. Both materials have found favour in the cosmetic industry due to their water-retaining and moisturising properties.

These materials constitute those derived from oils and fats. Triglycerides are extracted from sunflowers, rape and soya oils. Cashew nut shell liquid is also employed from this classification. The development of rape and soya oils has lead to an increased volume production for use within non-food alternatives and this has had a subsequent impact upon the overall material cost through an increase in global demand (a.19).

Synthetic

Synthetic biopolymers are those which are not found naturally occurring and as a result are artificially manufactured by man. Generally these are derived from fossil fuel materials, much in the same way as traditional commodity polymers. These materials include polycaprolactone (PCL), PVAL and EVOH.

Polycaprolactone (PCL) have been available in differing forms since the mid 1970s, but whilst the low melting point of the material makes thermally accelerated degradation an increasingly attractive proposition, it means that the material cannot be used in applications that will generate some heat. Current uses for PCL include orthopaedic casts and adhesive mould agents. Other aliphatic polyesters include polybutylene succinate (PBS). Aliphatic-aromatic copolyesters and hydro-biodegradable polyesters such as modified PET are also available.

12. Blends

A blend is a combination of two or more materials whose objective is to achieve a superior performance from the composite than is available from the separate constituents. Natural polymers have been introduced in different kinds of blends as both polymers and as fillers in order to improve biodegradability. Starch has been used widely for this reason due to its low cost and large availability in the market.

Blend materials are produced by processing of starch with biodegradable polymers such as PVAL, PLA, PCL and PHB plastics (PHBV) to mention but a few. Other natural polymers blended with biodegradable polymers to produce biodegradable composites materials include: cellulose, pectin, chitosan, lignin, soy protein and wheat gluten.

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13. Blends of PVAL

13.1 PVAL-Starch Blends

PVAL can be blended with thermoplastic, water-

soluble starch, (e.g., potato starch) to produce readily

biodegradable plastics. The blends show only one

melting point, which is lower than those reported for

either blend component. This suggests a miscibility

between the two components. Some PVAL-starch

blends commercially available are shown in Table 8.

Degradation occurs via hydrolysis and biodegradation

of the sugar molecules. Water, plasticisers (such as

glycerol and sorbitol) and other processing aids are used

to prepare the blends which allow a reduction in the cost

of the material but with many of the useful properties

of the PVAL retained. As both materials are available

individually, manufacturers are able to produce their

own custom blends.

These materials have found applications in packaging.

For example, a water-soluble starch/PVAL compound

including silicate nanoclay is used in Australia for

thermoformed candy trays (a.10).

A further application for this material is in loose fill

packaging materials. These are expanded products

with densities ranging from 0.01 to 0.1 g/cm3. Water

solubility can be achieved in under three minutes.

Table 8 Starch-PVAL Blends Commercially Available

Polymer Type Tradename Origin

Starch-PVAL blends Novon Japan

Novon USA

Mater-bi Italy

Thermoplastic starch (TPS) cannot be drawn into a film

by itself as it is too sticky. However, in combination

with PVAL, thin film (less than 200 μm) is easier

to process than with PVAL alone. This is because

the TPS improves the melt strength and elongation

properties. These blends also show improved moisture

absorption in humid conditions and offer considerable

more resistance to some chemicals than basic PVAL

film formulations.

Whilst the TPS improves the viscosity characteristic

for film blowing, it is offset by a drop in tensile strength

and puncture strength. Also the water solubility time

is increased as the wet strength decreases. This can

be seen in Table 9.

These materials are suitable for many mainstream

PVAL water soluble applications such as hospital

and medical disposal bags, dissolvable packaging

for detergents and other cleaning items (toilet

blocks, tablets detergents) and others already listed

in this review. However, these blends are cheaper

to produce.

Table 9 Properties of PVAL and TPS Property Test Method PVAL 1 PVAL 2 PVAL/TPS 1 PVAL/TPS

TPS content (%) 0 0 50 50

Film thickness (μm)

50 40 50 40

Tensile strength Dry (MPa)

ASTM D882 (a.11)

40 75 25 35

Tensile strength Wet (MPa)

ASTM D882 (a.11)

15 0.5

Elmendorf tear, kg (N)

ASTM D1004 (a.12)

3.0 0.45 1.50 1.00

Solubility Properties –dissolution time (s/˚C)

ASTM D5226 (a.13)

60/10 70/65 100/10 185/65

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13.2 Other Blends

Whilst PVAL-starch blends are sold commercially there are other blends of interest being developed. Blending has long been done with conventional plastic materials and the benefits are clear, by varying specific amount of the components a number of varying and tailor made properties can be produced.

Therefore blending a biodegradable but synthetic material with a biopolymer is therefore a new avenue for polymer manufactures to explore. A whole range of polymers and copolymers have been examined by academia. It has been found cellulose and PVAL form compatible blends whilst starch, gelatine and lignocellulosic materials produce incompatible PVAL blends.

13.2.1 PVAL/Gelatin Blends

Gelatin has a natural polymer source (amino acid) and is actually denatured collagen.

Gelatin is obtained from animal skin and bones and waste gelatine disposal is an issue in its own right. Diversion of waste gelatine into other applications is therefore advantageous. Like PVAL, gelatine possess film forming properties and is used in a variety of applications where this property can be utilised, such as sausage casings, thickening agent (food industries), as an adhesive in book making and as drug capsules (pharmaceutical). The combination of the two materials is therefore of interest. Two different areas of research with the materials are outlined next, one in agriculture and one in medical applications.

PVAL alone can act as a soil conditioner, gelatine alone can act as a nitrogen fertiliser. The combination of the two could provide self-fertilising films (a.14). It would also increase water permeability of films but keep their mechanical integrity. The components are immiscible on a macromolecular level but regardless of this, the film properties of a cast solution are improved by material combination if PVAL levels are kept at 80% or more. However, it appears that the more biodegradable gelatine is rendered less active by the addition of PVAL whose own biodegradability remains relatively unchanged by the addition of gelatin.

When combined in solution and cast as a film, PVAL-gelatin forms a hydrogel membrane. One potential application for this material has been identified by researchers as a moist wound dressing (temporary

artificial skin) (a.15). The resultant membrane showed interesting properties: being superabsorbent and compatible with human blood and further research is ongoing in this area.

14. Degradability

The issue of degradability and biodegradability of plastics and biomaterials can be confusing. There are a number of materials that can be degraded but not biodegraded. Therefore it is worth clarifying what these terms actually mean:

Degradation of plastic: a change in the chemical structure resulting in failure of physical properties or appearance.

Degradable plastic: a plastic which undergoes degradation at specific environmental conditions. This is determined by a standard test method and specified change over time of the property measure (such as physical property or appearance). Examples of this type of degradation could for example be photodegradation, biodegradation or composting.

Photodegradable plastic: where degradation is the result of daylight.

Biodegradable plastic: one which degrades over time, through the action of nature. In the correct conditions, naturally occurring organisms such as bacteria, algae and fungi can metabolise the material to biomass. However, those materials derived from fossil fuels can also result in carbon dioxide being released into the environment during the degradation process.

Compostable plastic: where degradation occurs during composting by biological processes at a suitable rate and leaves no visible or toxic residues. The resultant degradation products are biomass, carbon dioxide and water.

Oxidatively degradable plastic: is a plastic in which the degradation results from the action of oxidation.

Hydrolytically degradable plastic: a plastic in which the degradation results from hydrolysis.

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According to the American Society for Testing and Materials (ASTM), polymers are biodegradable if degradation results from the action of naturally occurring micro-organisms such as bacteria, fungi, and algae. As we have seen, biodegradable polymers can be produced from natural materials such as starch and cellulose, as well as from polymers that are derived from petrochemical feedstocks.

Biopolymers like polyester and starch-based polymers are being pushed as an environmentally friendly alternative to petroleum-based polymers, which may take hundreds of years to naturally biodegrade. Biopolymers can be produced without toxic by-products and biodegrade quickly, leaving a minimal human footprint on the environment. However, like the issue of degradability there is often confusion over the terms biopolymer, bioplastics and biodegradability.

A bioplastic is made from a renewable natural biological polymer source (plant, animal or microorganism), however, materials are also available in the marketplace that have both bio-origin and petroleum based materials. Equally, materials may mix biopolymers with non-bioadditives. So while some materials may be 100% fully fledged biological plastic (including all the additives and the polymer), others may be a combination.

A further confusion comes with the fact that just because a bioplastic has components of a biopolymer, it does not necessarily biodegrade as the original source material did. On the other hand a petroleum-based plastic such as PVAL is water soluble, but does not have the ‘green’ credentials often credited to bioplastics. Biopolymers can be made into any number of material types, such as thermoplastics, thermosets, elastomers, just like their oil-based counterparts. Therefore biopolymer, bioplastic and biodegradable are not the same thing and it should not be assumed (although mainly it does) that one necessarily follows from the other. PE can be produced from oil feedstocks, however, it can also be produced by using sugar. PE which has been produced by the sugar route is a biopolymer, that produced by oil is not. However, neither are biodegradable, though they can be made to degrade over time through the use of additives. This sort of controlled degradation of synthetic polymer is well known, especially for PE films.

A biodegradable plastic is one which degrades through the action of nature. That is through naturally occurring organisms such as bacteria, algae and fungi. This mechanism could occur through mechanisms such as composting, soil burial, anaerobic digestion, marine and freshwater environments or exposed to the environment as litter.

The final option of the disposal of litter through biodegradation is attractive. The persistence of plastic products discarded in the environment is a major problem. The majority of these wastes come in the form of packaging which has a short life cycle. Therefore, biodegradable materials, especially in the packaging industry are becoming an important strategy for the future removal of plastic waste from our environment.

There are currently three different types of biodegradable materials that can be readily identified in the marketplace:

polyethylene oxide).

as maize, corn and starch which are biodegradable. (These will be discussed in more depths in Section 14.1).

14.1 Biodegradable Plastics

A biodegradable plastic has been defined in Section 14 as when the degradation is the result of naturally occurring microorganisms (e.g., algae, bacteria or fungi) and a compostable plastic as one in which the degradation also occurs by biological processes but in a specified composting environment (a.10, a.16).

A number of different definitions of biodegradable plastics have been published by different organisations. However, most of the definitions of biodegradation are based on the same concept: the action of micro-organisms on the material and its conversion into carbon dioxide or methane and water.

For example, under EN 13432 (a.17) the scope of testing for packaging includes assessment of four factors. These are:

Biodegradability, disintegration during biological treatment, the effect on the biological treatment process and the effect on the quality of the resultant compost.

Some of the factors considered include:

Before assessment materials must be characterised by their constituent parts including the presence of any heavy metals, volatile solids and the organic carbon content amongst others.

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Disintegration in a biological waste treatment process can be either aerobic or anaerobic but must occur without any detrimental affects on the process itself.

For anaerobic biodegradation testing the maximum testing time can be 2 months, for an aerobic biodegrading test the maximum degradation exposure time is 6 months.

After degradation has occurred the compost would be sieved for residues and not more than 10% of the original dry weight of the material shall fail to pass through a < 2mm sieve fraction for an acceptable disintegration to have occurred.

Composting plastics are required to leave no toxic residues, biodegradation is generally less specific. It is therefore important to consider degradation in light of the specific standards and test methods for the materials being considered.

14.2 Oil-Based Naturally Degradable Polymers

As we have seen it is not only biopolymers than can degrade in the environment. Synthetic materials can be made to degrade by the use of additives or by being soluble in water. There are two main types of polymers in this category, PVAL and EVOH. Like PVAL, EVOH is also a water-soluble synthetic plastic and is commonly used in multilayer film packaging (film and blow moulding) in conjunction with cheaper materials as an oxygen barrier layer. It is a high cost material whose pricing presents a considerable barrier to expansion into the degradable plastic market.

14.3 Photo-degradable Plastics

A further type of the way plastics can be degraded is through the use of daylight. This is called photodegradability, The ultraviolet (UV) radiation present in daylight can be used to photodegrade synthetic polymers which contain suitable formulations. This type of degradation can therefore be triggered in polymers such as PE. By incorporating light sensitive materials into plastic formulations either through the use of copolymers or additives it is possible to induce bond breakage of the carbon backbone. Plastics left exposed to UV light, therefore, breakdown becoming increasingly weak and brittle as the bonding breaks down. This also makes the residual components more likely to degrade further from other environmental

effects such as abrasion or mechanical impact. Since their effectiveness to degrade is effected by the intensity of the UV exposure, factors such as weather conditions and location are major factors in the process. Photodegradable plastics remain most useful in applications that remain problematic to littering an obvious example being plastic bags.

However, it should be noted that while most synthetics do not naturally degrade in the environment at useful timescales, they can be made to be degrade much faster if this is required. Controlling this rate is another issue and one which is beyond the scope of this review. However photodegradation is an example of controlled degradation in action.

15. Plastics and Biodegradable Plastics Disposal

Much of European environmental policy on plastics and biodegradable materials has come from European Union legislation. Environmental Action Programmes (EAP) have been in place for over 30 years now. There have been six versions which have developed increasingly as our understanding of environmental protection has advanced. Therefore from the first through to the current sixth EAP, increasing legislative requirements have been developed for the benefit of EU citizens.

However, a midterm report on the sixth EAP published in April 2006 stated that ‘the EU was still not yet on the path towards genuine sustainable development’. Therefore further legislation is still likely in waste management. In the context of this review, areas of interest to future markets of PVAL derive from tougher legislation in the areas of The Landfill Directive and Sustainable Development, both objectives in EAP 6.

For sustainable development the key themes is to promote both sustainable production and consumption. This should encourage the growth of environmental degradation as a waste disposal option. The EU intends to support research and encourage further adoption of Integrated Product Policy (IPP) programmes which are aimed at reducing environmental impact associated with particular products and services. Therefore, manufacturers in member states will be encouraged to reduce impact throughout the life cycle of their products. The EU has already adopted IPP philosophy is legislation which can be seen in both the End-of-Life (ELV) Vehicle Directive (a.18) and even more obviously in the WEEE Directive (a.8), however, these

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are sectors in which PVAL is not expected to have great impact in the foreseeable future. (Though given advances in material technology, applications such as PVAL mobile phone cases may one day be seen.)

The 1999 EU Landfill Directive (Directive 1993/31/EC) which took a further three years to become transposed into English law, will have widescale implications for how plastic waste is disposed of in future, certainly within the UK which has been heavily reliant on this form of waste disposal. Biodegradable municipal waste going to landfill must be drastically reduced, dropping to just 35% of that produced in 1995 by 2020. Whilst this legislation is not aimed at just plastics but all materials, it is clear that disposal by other means, i.e., composting facilities, are being encouraged by such legislation.

The waste management hierarchy is:

1. Prevention

2. Re-use

3. Recycling

4. Recovery (including energy recovery)

5. Safe disposal

Therefore the sensible approach in dealing with plastic waste is to reduce the amount of waste at source. For waste already generated, control should be exercised over the life cycle from design, production and usage. For bioplastics, re-use and recycling will be less of an option as the preferred disposal would be for biomass production. However, this also throws up issues of energy usage as a durable oil-based plastic once produced may be recycled several times before being recovered for energy via incineration. A one use biopolymer would be made, used, and then discarded. These are issues which must be considered in adoption of these materials. Is it worth putting all that energy into making them to immediately discard them and turn them back to biomass?

The type of biodegradable plastic employed for any application should dictate the disposal route. This may be by standard plastic reprocessing, landfill or open environments. A compostable material needs composting facilities and water soluable and/or water degradable materials need water or waste water treatments. Contamination of conventional plastics recycling routes could be a significant risk in future as biopolymers become more established in the market place.

Consider the effect of a photodegradable HDPE on HDPE recyclate. It would remain undetected in feedstock and be recycled with non-degradable plastics.

However, once these materials are reused for example as containers, they would retain the potential to degrade and disintegrate under daylight. Consumers would not be too happy if their water butts or compost bins disintegrated. Therefore, widescale use of degradable plastics has the potential to undermine the growing confidence in recycled plastics. Effective methods for control of sorting degradable and non-degradable plastics will be necessary to ensure this does not happen if there is a significant change in degradable plastic usage. Labelling to inform consumers of where to dispose of their plastics is one such method,

There are several identifiable environmental benefits that may potentially be derived from the use of biodegradable plastics compared to non-degradable plastics. These are:

such as PVAL increases the soil organic content as well as water and nutrient retention, while reducing chemical inputs and suppressing plant disease.

environmental benefits in many cases: the use of potentially sustainable resources and reduced greenhouse gas emissions.

However, it should be remembered that there is potential for adverse environmental risks with biodegradable plastics. Despite their nature, they still require time in order to decompose completely. There are significant concerns that with current low levels of consumer education, biodegradable plastics may be seen as being suitable for disposal through any means available, and in some cases predictions are that littering will even rise as a result of their use and subsequent incorrect disposal. However, there are specific requirements regarding degradation, and indeed, in many cases the contamination of traditionally employed polymer waste streams with biomaterials is another considerable problem to be overcome. One potential method of resolving this issue is the development and implementation of some form of labeling or decoration to ensure consumers are aware of the correct disposal routes.

A further consideration is that biodegradable plastics which end up in landfills may also prove problematic as they are unlikely to degrade under such highly packed conditions and could prove as persistent as standard plastics wastes in landfill sites. Furthermore, there is potential for methane to be released during the degradation process with some biopolymers which would clearly exacerbate global environmental issues.

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European legislation promoting sustainability will continue to be an important market driver. However, high costs relative to conventional plastics, concern about performance of biodegradable plastics, and limited production capacity have restricted market expansion to less than 1%. However, certainly in Europe, bioplastics are viewed as a large potential market for starch-based crops like corn, wheat, potatoes and peas. Currently, bioplastics applications account for only a few, serving mostly the low end loose fill packaging and high end surgical/medical devices and cosmetic packaging markets. However, if mandatory biodegradable regulations are enacted, the European markets could expand quickly.

Consumer education on sustainability, recycling and degradability should be encouraged allowing the public to have a clear picture of the options available rather than the limited viewpoints that are expressed by national newspapers for instance.

This will allow for a clearer determination of appropriate waste disposal methods such as composting, incineration and landfilling.

15.1 Composting

Compost is the natural, aerobic (oxygen using) and exothermic (heat producing) process which occurs with the breakdown of organic matter derived from animals and plants. Bacteria, fungi, insects and animals which inhabit soil break down the material and as a result biomass/humus, carbon dioxide (or methane) and water are formed. The resulting biomass can then be used to facilitate further plant growth with the use of the soil like residues, which contain significant levels of useful bacteria and nutrients and the volume of organic waste sent to landfill is also reduced.

For composting to become a major part of our waste disposal infrastructure a large number of commercial composting facilities will be required. Under waste management regulations these, like landfill sites, are likely to require licenses to ensure correct environmental standards are adhered to. It will also need a shift in the way waste is sorted. However, putting our plastic waste onto the compost heaps in our gardens may be some time away.

15.2 Incineration

Incineration, whilst not used as a major waste disposal option in the UK is the primary waste disposal route for a number of countries. Japan for example, where landfill space is limited, disposes of over 90% of its waste in this manner. Scandinavian countries also strongly favour this method of waste disposal over landfill.

The reason is that the content of municipal waste including plastic wastes, are a good source of fuel. Plastics are made from oil reserves after all. Further, the energy created by incineration can be used to generate electricity and therefore this method of disposal is often termed energy recovery. Whole cities can be powered by burning wastes by this method. However, countries who favour land filling such as the UK, do not currently have the incinerator capacity available to make widescale switches in their waste disposal strategy.

Modern technology ensures problems of emissions are minimised but often incinerators are of concern to the residents living nearby for fear of air pollution and new installations often therefore attract strong protests. Incineration does not eliminate all waste but substantially reduces it. The residues still need to be disposed of, usually by landfilling.

Plastics disposed of by incineration leave no residue. However, the use of fillers and additives may reduce the energy produced as the polymer percentage is reduced. Western Europe generates around 100 million tonnes of solid waste annually of which around 7% is plastics. However new technologies for disposal are emerging for plastic materials with heat generation, most notably methods of pyrolysis which have been developed to recover chemical fractions of the plastics which can be used as fuels or chemical feedstocks. Reinforcements where present such as glass and carbon fibre can also be collected by similar methods. At present there are technologies for collecting the polymer and technologies for collecting the fibre but not as yet, a single combined solution. However, research is ongoing in this area of materials recovery. For thermoset materials, which cannot be recycled, this could be the most appropriate method of future waste disposal. The strength and durability of thermoset composite materials makes them highly unlikely to be replaced by biopolymer composites in the near future.

Polyvinyl Alcohol: Materials, Processing and Applications

15.3 Landfilling

In the UK landfilling has been the principal means in which waste has been handled (over 80% of our waste goes to landfill), this is in contrast to some other European countries that favour incineration (with energy recovery) to dispose of their waste. However, following EU legislation, namely the EU Landfill Directive, strategies for diverting biodegradable municipal waste from landfill must be implemented.

Because of the reliance on landfilling in the UK, they were given four years longer to implement the targets (an offer extended to all EU Member States land filling at levels over 80%).

Waste considered hazardous, non hazardous and inert must be separated by landfill operators and a single site can only be licensed to accept one type of waste. Landfill operators are also, as of October 2007, required to treat non-hazardous waste. This can include any biological, chemical, physical or thermal process which reduces volume or hazard. This can include sorting, to encourage recycling or energy recovery.

The underlying principles of landfill operation remain the same: to prevent or reduce negative effects of land filling which threaten either the environment or human health.

16. Conclusion

PVAL is unique among synthetic polymers. Although made from oil-based feedstock, this polymer has an inherent ability to be biodegraded. With properties once regarded as a scientific curiosity and a niche market which utilises its inherent water solubility and with biocompatibility and biodegradable credentials, this material is likely to expand further into markets in which biopolymers and biodegradable materials (namely short life consumer products and medical applications) are likely to dominate in future.

With biodegradable plastics materials likely to become more valuable as land fill operations seek to divert such waste, it is unclear how this may affect the prospects for biodegradable plastics in the marketplace unless prices become more commercially comparable with traditional commodity plastics. Blending of materials may provide one method to limit the cost penalties but the wide scale implications for waste disposal and expanding recycling

capacity if such materials are used is also uncertain. However with increasing pressure for sustainability to be bought to bare from the EU, significant shifts both in the marketplace and disposal infrastructure will have to occur to meet the waste targets.

References

a.1 BS EN ISO 15023-1, Plastics - Poly(vinyl alcohol) PVAL Materials - Part 1: Designation System and Basis for Specification, 2006.

a.2 DIN 53015, Viscometry - Measurement of viscosity by means of the rolling ball viscometer by Hoppler, 2001.

a.3 Japan Chemical Week, 2006, 47, No.2385, 8.

a.4 N. Preston, Flexible, 2006, 4, 5, 40.

a.5 M. Kokabi, M. Sirousazar and Z.M. Hassan, European Polymer Journal, 2007, 43, 3, 773.

a.6 F.F. Nord, Naturwiss 1936, 24, 763.

a.7 E. Chiellini, A. Corti, S. D’Antone and R. Solaro, Progress in Polymer Science, 2003, 28, 963.

a.8 The European Directive on WEEE (Directive 2002/96/EC)

a.9 Plastics Technology, 2004, 50, 10, 32.

a.10 Plastics Technology, 2007, 53, 2, 60.

a.11 ASTM D882, Test Method for Tensile Properties of Thin Plastic Sheeting, 2002.

a.12 ASTM D1004, Test Methods for Tear Resistance (Graves Tear) of Plastic Film and Sheeting, 2008.

a.13 ASTM D5226, Practice for Dissolving Polymer Materials, 2003.

a.14 E.R. Kenaway P. Cinelli A. Corti S. Miertus and E. Chiellini, Macromolecular Symposia, 1999; 144, 351.

a.15 K. Pal, A.K. Banthia and D.K. Majumdar, AAPS PharmSciTech, 2007, 8, 1, Article 21.

a.16 A. Srivastava, Popular Plastics and Packaging, 2004, 49, 1, 87.

a.17 EN13432, Packaging - Requirements for Packaging Recoverable Through Composting

Polyvinyl Alcohol: Materials, Processing and Applications

and Biodegradation - Test Scheme and Evaluation Criteria for the Final Acceptance of Packaging, 2005.

a.17 G. Scott, Polymer Degradation and Stability, 2000, 68, 1.

a.18 End-of-Life Vehicle (ELV) Directive [Directive 2000/53/EC]

a.18 M. Heyde, Polymer Degradation and Stability, 1998, 59, 1-3, 3.

a.19 R.Chandra and R. Rustgi, Progress in Polymer Science, 1998, 23, 1273.

a.20 P. Nayak, Review of Macromolecular Chemistry

and Physics, 1999, 39, 3, 481.

Abbreviations and Acronyms

ASTM American Society of Testing and MaterialsCRT Cathode ray tube(s)EAP Environmental Action Programme(s)ELV End-of-life vehicleEU European UnionEVOH Ethylene vinyl alcoholHDPE High-density polyethyleneIPP Integrated product policyLCA Life cycle analysis(es)LCD Liquid crystal display(s)LDPE Low-density polyethyleneLLDPE Linear low-density polyethyleneOPP Orientated polypropylenePA PolyamidePBS Polybutylene succinatePCL Poly- -caprolactonePDP Plasma display panel(s)PE PolyethylenePET Polyethylene terephthalatePHA PolyhydroxyalkonoatesPHB PolyhydroxybutyratePHBV Poly(hydroxybutyrate-co-

hydroxylvaleratevalerate)PLA Poly(lactic acid)PP PolypropylenePVAc Polyvinyl acetatePVAL Poly(vinyl alcohol) PVB Poly(vinyl butyral)PVC Polyvinyl chloridePVDC Poly(vinylidene chloride)TPS Thermoplastic starchUV Ultraviolet

References and Abstracts

Abstracts from the Polymer Library Database

Item 1Advanced Functional Materials18, No.19, 2008, p.2946SURFACTANT-FREE SELF-ASSEMBLED PVA-IRON OXIDE/SILICA CORE-SHELL NANOCARRIERS FOR HIGHLY SENSITIVE MAGNETICALLY CONTROLLED DRUG RELEASE AND ULTRAHIGH CANCER CELL UPTAKE EFFICIENCYHu S-H; Liu D-M; Tung W-L; Liao C-F; Chen S-Y

The synthesis of surfactant-free self-assembled poly(vinyl alcohol)(PVA)-iron oxide/silica core-shell nanocarriers by encapsulation of monodispersed magnetic iron oxide particles derived by high temperature decomposition of ferric acetylacetonate and a model hydrophobic drug such as ibuprofen using PVA as binder followed by coating with a thin shell of silica by hydrolysis and condensation of tetraethyl orthosilicate is described. The products were characterised by FE-SEM TEM SQUID magnetometry and XRD and their controlled drug release properties under an external magnetic field were investigated by UV-visible spectroscopy. 28 refs.

Taiwan National Chiao Tung UniversityTAIWAN

Accession no. 1030215

Item 2Advanced Functional Materials18, No.19, 2008, p.2855A NOVEL CROSS-LINKED POLY(VINYL ALCOHOL) (PVA) FOR VASCULAR GRAFTSChaouat M; Le Visage C; Baille W E; Escoubet B; Chaubet F; Mateescu M A; Letourneur D

The fabrication of crosslinked poly(vinyl alcohol)(PVA) films by aqueous solution casting in the presence of sodium trimetaphosphate as crosslinking agent and their characterisation by DMA and by biocompatibility via cell culture studies is described. The fabrication of small diameter tubes based on the crosslinked PVA films via a gluing procedure with cyanoacrylate adhesive was investigated and their evaluation as potential vascular grafts by in-vitro and in-vivo testing is discussed in terms of mechanical properties such as compliance elasticity and resistance to mechanical stress compatible with circulatory blood flow. 31 refs.

INSERM; Montreal University; Paris VII Universite; Paris XIII UniversiteCANADA; EUROPEAN COMMUNITY; EUROPEAN UNION; FRANCE; WESTERN EUROPE

Accession no. 1030209

Item 3Polymer49, No.21, 2008, p.4740TRANSITION OF HYDRATION STATES OF POLY(VINYL ALCOHOL) IN AQUEOUS SOLUTIONWenbo Li; Yun Zheng; Rongshi Cheng

A straightforward method for determination of the hydration number of polymer in aqueous solution based on ice-melting technique of DSC is proposed. The simple yet precise method has been applied to determine the hydration number of poly(vinyl alcohol) (PVA) in aqueous solution covering a wide range of concentrations from 0.005 to 0.3 g(solute)/g(solution) for three samples with different molar masses. The hydration number of PVA maintains a constant lower value of 2.5 when the concentration exceeds 0.2 g(solute)/g(solution). It increases to a value of 7 when the concentration decreases to the overlap concentration C*of the polymer where C*was estimated as the reciprocal of its intrinsic viscosity. For solutions of C<C* the hydration number keeps constant again at the value of 7. This behaviour evidently demonstrates that PVA has two hydration states one occurs at the dilute regime and the other occurs at concentrated regime. The concentration dependent transition from one state to another is treated mathematically by a quantitative formula which involves two parameters: one denotes the transition concentration and the other denotes the width of the transition region. The transition concentration decreases linearly with increasing molar mass resembling the behaviour of molar mass dependence of overlap concentration. The structural features for the two states of hydrated PVA are briefly discussed. 19 refs. Copyright (c) 2008 Elsevier Ltd.

Nanjing University; South China University of TechnologyCHINA

Accession no. 1029966

Item 4Polymer Preprints2008, 49, No.2, p.343SYNTHESIS OF POLY(VINYLACETYLENE) BLOCK COPOLYMERS AS PRECURSORS FOR NANOCARBON MATERIALSAimi J; McCullough L A; McGann J; Kowalewski T; Matyjaszewski K

Poly(vinylacetylene) (PVA)-containing block copolymers were synthesised via activators regenerated by electron transfer (ARGET) atom transfer radical polymerisation (ATRP). The active acetylenic hydrogen atom in vinylacetylene was substituted by the trimethylsilyl group in order to prevent 14-polymerisation. In the hom*opolymerisation of trimethylsilyl-protected

References and Abstracts

vinylacetylene (VA-TMS) it was found that a lower temperature prevented side reactions and gave a well-controlled polymer with low polydispersity. The desilylated hom*opolymer of PVA-TMS was easily crosslinked to give an insoluble polymer. A block copolymer of PMMA-b-PVA was also synthesised by ATRP. This block copolymer seemed miscible thus block copolymerisation overcame the insolubility of the deprotected hom*opolymer. Nanocarbon materials could be prepared by pyrolysis of PVA-containing block copolymers. 7 refs.

Carnegie-Mellon University; Washington D.CUSA

Accession no. 1029567

Item 5Journal of Applied Polymer Science110, No.3, 2008, p.1784KINETIC STUDY OF THE FREE-RADICAL POLYMERIZATION OF VINYL ACETATE IN THE PRESENCE OF DEUTERATED CHLOROFORM BY 1H-NMR SPECTROSCOPYSemsarzadeh M A; Abdollahi M

Real time nuclear magnetic resonance spectroscopy was used to study the kinetics of the free radical polymerisation of vinyl acetate using deuterated chloroform as chain transfer agent and azobisisobutyronitrile as initiator. Effects of the concentrations of initiator and solvent on reaction kinetics were evaluated and kinetic parameters such as rate and transfer constants and initiator efficiency were calculated. It was shown that both temperature and solvent concentration affect initiator dissociation rate constant but initiator concentration does not. The solvent concentration was found to have an effect on both initiator efficiency and termination rate constant. 60 refs.

Tarbiat Modarres UniversityIRAN

Accession no. 1029333

Item 6Journal of Applied Polymer Science110, No.3, 2008, p.1632INFLUENCE OF HIGH PRESSURE GASES ON POLYMER-SOLVENT THERMODYNAMIC AND TRANSPORT BEHAVIORJones A T; Danner R P; Duda J L

The use of soluble gases as co-solvent in the devolatilisation process for removal of residual solvents and monomers in the polymerisation process was investigated using either carbon dioxide or ethylene with polystyrene or polyvinyl acetate. The introduction of the gas was found to reduce polymer solubility and increase solvent diffusivity and ethylene was found to have the most effect. Gas chromatography was used in the analysis of solvent removal and the work demonstrated the potential for increasing production rates in polymerisation process by exchanging the

normal non-interacting gases such as nitrogen or air by a soluble gas. 18 refs.

Pennsylvania State UniversityUSA

Accession no. 1029314

Item 7Polymer Reprints49, No.2, 2008PHOTOINDUCED LIVING RADICAL POLYMERIZATION WITH HIGHLY ACTIVE MANGANESE COMPLEXKoumura K; Satoh K; Kamigaito M

Efficient controlled radical polymerisation of vinyl acetate (VAc) methyl acrylate (MA) or styrene (St) occurred in the presence of a system comprising ethyl iodoacetate or ethyl 2-iodo-2-methylpropanoate and dimanganese dodecacarbonyl under visible light irradiation. The polymerisation of VAc was rapid and efficient and gave a polymer with a controlled molecular weight even at a low concentration of Mn2(CO)10. The polymerisations of MA and St also gave polymers with controlled molecular weights. 4 refs.

Nagoya University; Washington D.C. JAPAN; USA

Accession no. 1029046

Item 8Pharmaceutical Technology Europe20, No.10, 2008, p.32PVA COPOLYMER: THE NEW COATING AGENT FUJII T; NOAMI M; TOMITA K; FURUYA Y

The commercial development of a copolymer of vinyl alcohol with acrylic acid and methyl methacrylate as a sprayable film coating agent for tablets and microparticles is described. The copolymer was characterised by solubility and viscosity in water DSC oxygen permeability the strength of film adhesion to the tablet core drug dissolution properties and impact strength and the results are discussed in comparison with those for hydroxypropyl methylcellulose as control in terms of pharmaceutical applications. 10 refs.

Shionogi and Co.Ltd.JAPAN

Accession no. 1028318

Item 9Journal of Materials Science43, No.17, 2008, p.5898TWO-STEP SYNTHESIS OF POLYACRYLAMIDE/POLY(VINYL ALCOHOL)/POLYACRYLAMIDE/GRAPHITE INTERPENETRATING NETWORK HYDROGEL AND ITS SWELLING CONDUCTING AND MECHANICAL PROPERTIESFan S; Tang Q; Wu J; Hu D; Sun H; Lin J

References and Abstracts

The two-step synthesis of poly(acrylamide)/poly(vinyl alcohol)(PVA)/polyacrylamide/graphite interpenetrating network hydrogels by initial radical polymerisation of acrylamide in the presence of PVA and graphite micropowder with potassium persulphate as initiator followed by a subsequent radical polymerisation of acrylamide and NN'-methylene bisacrylamide as crosslinking agent is described. The hydrogels were characterised by FTIR TGA electrical conductivity and tensile properties and the effects of PVA graphite and crosslinking agent contents on swelling properties of the hydrogels are discussed. 39 refs.

Huaqiao UniversityCHINA

Accession no. 1028239

Item 10FujianKey Laboratory of Polymer Materials Composites Part A39, No.10, 2008, p.1638CELLULOSE NANOFIBER REINFORCED POLY(VINYL ALCOHOL) COMPOSITE FILM WITH HIGH VISIBLE LIGHT TRANSMITTANCEChunyi Tang; Haiqing Liu

In this paper we presented the fabrication and characterisation of poly(vinyl alcohol) (PVA) composite film reinforced with high volume of electrospun cellulose nanofibrous mat (CNM). Its visible light transmittance and mechanical properties were examined in relation to fibre content in the composite. Optimal CNM content in the composite was found to be 40wt% in terms of its overall properties. This composite film exhibited visible light transmittance of 75% and its mechanical strength and Young's modulus were increased by 50% and 600% respectively as compared to neat PVA film. 22 refs.

Fujian Normal UniversityCHINA

Accession no. 1028058

Item 11Materials Letters 62, No.28, 2008, p.4380 MECHANICAL STRENGTH IMPROVEMENT OF POLYPROPYLENE THREADS MODIFIED BY PVA/CNT COMPOSITE COATINGSBo Zhao; Jing Wang; Zijiong Li; Ping Liu; Da Chen; Yafei Zhang

Poly (vinyl alcohol)/carbon nanotube (PVA/CNT) composite was coated on the surface of polypropylene thread for toughness enhancement. Multiwall carbon nanotubes (MWNTs) were treated in acid and alkali to get water-soluble nanotubes and then embedded into poly (vinyl alcohol) (PVA) matrix resulting in polymer-carbon composite with hom*ogeneous nanotube dispersion. The stress-strain measurements show that the tensile strength and toughness of the PVA/CNT coated thread increased by

117% and 560% respectively. These results are supportive of good interfacial bonding between the carbon nanotubes (CNTs) and polymer matrix. 10 refs.

Shanghai Jiao Tong UniversityCHINA

Accession no. 1028026

Item 12Adhesive & Sealant Council Inc.2008, 70 papersWAC & EXPO 2008

Proceedings of the 2008 World Adhesive Conference and Expo held Miami Fl. 20-23 April 2008 Seventy papers were presented at the 2008 World Adhesive Conference. Topics addressed include: advancing end-use technologies; international regulations update; reactive adhesives; REACH: Understanding and compliance; advances in formulation; future trends in pressure-sensitive adhesives; and renewable resources.USA; WORLD

Accession no. 1027981

Item 13Journal of Polymer Science: Polymer Chemistry Edition46, No.19, 2008, p.6407PARTICLE NUCLEATION IN HIGH SOLIDS BATCH MINIEMULSION POLYMERIZATION STABILIZED WITH A POLYMERIC SURFACTANTBohorquez S J; Asua J M

The nucleation of polymer particles in the miniemulsion polymerisation of vinyl acetate and vinyl ester stabilised with PVOH was studied. The effect of costabiliser type PVOH concentration and type and concentration of initiator on the extent of droplet nucleation were studied. Droplet nucleation was maximised by improving miniemulsion stability and using efficient initiators. 35 refs.

Basque Country UniversitySPAIN

Accession no. 1027661

Item 14Estadual Polymer49, No.19, 2008, p.4066MULTIPLE HYDROPHILIC POLYMER ULTRA-THIN LAYERS COVALENTLY ANCHORED TO POLYETHYLENE FILMSSilva R; Muniz E C; Rubira A F

A novel procedure has been developed to covalently graft multiple hydrophilic polymer ultra-thin layers to functionalised polyethylene surface. Polyethylene films have been functionalised by two methods chromic acid oxidation and maleic anhydride grafting to produce surfaces containing reactive groups carboxylic acid and

References and Abstracts

anhydride respectively. The reactive groups formed in the functionalisation were used to anchor a poly(vinyl alcohol) (PVA) ultra-thin layer by thermal esterification. After anchoring PVA a second ultra-thin layer constituted of poly(acrylic acid) (PAA) was also anchored. The second layer was anchored by thermal esterification between PVA hydroxyl groups and PAA carboxylic acid groups. The procedure presented in this work allows the formation of an ultra-thin layer. The macromolecule anchoring reactions occur only at the interfaces consequently only the macromolecules in contact with the interface are anchored. The formation of the ultra-thin layer and the surface characteristics have been analyzed through XPS ATR-FTIR SEM and AFM data. 41 refs.

Maringa Universidade EstadualBRAZIL

Accession no. 1027532

Item 15Journal of Applied Polymer Science110, No.2, 2008, p.1136PREPARATION OF A MULTISTRUCTURAL FILM WITH CM-CHITOSAN AND PVA AND IN VITRO ORNIDAZOLE RELEASE FROM THE CARRIERLing Chong Wang; Xi Guang Chen; Cheng Sheng Liu; Li De Li; Qiu Xia Ji; Le Jun Yu

Using ornidazole as a model drug carboxymethyl chitosan drug-containing microspheres (CCMS) were prepared by a method involving emulsification solidification and drug loading. A multistructure drug system was then synthesised by incorporating these microspheres into polyvinyl alcohol (PVAl). The multi-stage system allowed control of drug loading encapsulation efficiency and drug release. Drug release from the combined system of CCMS and PVAl was slightly faster than from CCMS alone and followed a profile of a burst release followed by gradual release of the remaining drug. Microspheres were characterised using optical microscopy a particle size analyser and swelling measurements. Drug loading was determined by ultraviolet visible spectroscopy and drug release studies were carried out in-vitro. 22 refs.

Qingdao Ocean University; Qingdao UniversityCHINA

Accession no. 1027503

Item 16Journal of Applied Polymer Science110, No.2, 2008, p.695POTENTIAL APPLICATIONS OF POLY(VINYL ALCOHOL)-CONGO RED AQUEOUS SOLUTIONS AND HYDROGELS AS LIQUIDS FOR HYDRAULIC FRACTURINGVega I; Fernandez E; Mijangos C; D'Accorso N; Lopez D

A comparison was made of the viscoelastic properties of hydrogels and solutions based on congo red crosslinked

polyvinyl alcohol (PVA) or guar gum/borax complexes. Effects of concentrations of PVA and congo red and of the degree of hydrolysis on viscoelastic properties were also evaluated. The application of the PVA/Congo red system as a hydraulic fracturing liquid rather than the more commonly used guar gum/borax system was discussed and some advantages were reported. 20 refs.

Buenos Aires UniversityARGENTINA; EUROPEAN COMMUNITY; EUROPEAN UNION; SPAIN; WESTERN EUROPE CSIC;

Accession no. 1027450

Item 17Journal of Sol-Gel Science and Technology47, No.3, 2008, p.243POLYMER/SILICATE COMPOSITES: NEW MATERIALS FOR SUBSURFACE PERMEABLE REACTIVE BARRIERSHarrup M K; Jones M G; Polson L; White B

The fabrication of composite membranes of polyacrylonitrile poly(ethylene oxide) poly(ethylene glycol) poly(vinyl acetate) and poly(vinyl alcohol) with silica and ammonium molybdophosphate as sequestrating agent and their characterisation by DMA TGA ESEM and caesium sequestration studies is described. The applications of the membranes as materials for sub-surface permeable reactive barriers are discussed in terms of the requirements of water permeability mechanical strength selective metal sequestration and ease of use. 26 refs.

Idaho National LaboratoryUSA

Accession no. 1027385

Item 18Harbin Northeast Forestry University Polymer Composites29, No.9, 2008, p.998PREPARATION AND CHARACTERIZATION OF CARBOXYMETHYL POLYVINYL ALCOHOL-GRAPHITE NANOSHEET COMPOSITESYu C; Li B

Carboxymethyl polyvinyl alcohol (CMPVA) was prepared by introducing carboxymethyl groups to polyvinyl alcohol (PVA) with chloroacetic acid. Graphite nanosheets (NanoG) were obtained by treating expandable graphite at a high temperature in a muffle furnace and then sonicating it in an aqueous ethyl alcohol solution. Nanocomposites of CMPVA with NanoG were prepared by dispersing NanoG in a CMPVA aqueous solution with the aid of sonication and then casted on plastic film to remove water. Carboxymethyl groups were proved to be linked to PVA by Fourier transform infrared (FTIR) spectra and the degree of carboxymethyl substitution on the PVA was 2.77% determined by conductometric titration. Experimental results show that carboxylate anions in introduced carboxymethyl groups facilitate the dispersal

References and Abstracts

of NanoG with positive charges in the CMPVA solution. The CMPVA matrix was detected by X-ray diffraction (XRD) and FTIR spectra to be less crystal into which NanoG tend to disperse. Scanning electron microscopy was used to characterize the structure of the graphite and morphology of the composites to prove that NanoG was 40-70 nm thick. The percolation threshold of CMPVA/NanoG composites at room temperature was as low as 0.80 wt%. 30 refs.CHINA

Accession no. 1027294

Item 19ANTEC 2008. Proceedings of the 66thAnnual Technical Conference held Milwaukee Wi4th-8th May, 2008, p.2227ADHESION OF PLASTICS WITH BONE: A COMPARATIVE STUDY USING COMMERCIALLY AVAILABLE ADHESIVES AND BIODEGRADABLE POLYMER MELT ADHESIVESShrivastava A; Weinzwig J; McCarthy S

Biodegradable bone substitutes can be secured to bone surfaces using several techniques. One such technique is by using adhesives to glue the bone plates to the bone surface. This phenomenon has a potential of replacing the existing screws and the associated complex techniques and equipment. A time-based study comparing the adhesion of bone plates with bone using commercially available adhesives and biodegradable polymer melt adhesives was performed and the load bearing capacities were measured. This paper demonstrates and compares the effective use of adhesives and melt blends replacing the existing fixation techniques involved in craniomaxillofacial surgery. 18 refs.

Lowell Massachusetts University; Massachusetts Lahey Clinic Medical CenterUSA

Accession no. 1026247

Item 20ANTEC 2008. Proceedings of the 66thAnnual Technical Conference held Milwaukee Wi4th-8th May, 2008, p.2148INJECTION-MOULDED POLYMER SCAFFOLD FOAMSKramschuster A; Turng L S

In this research injection moulding was combined with a novel material combination supercritical fluid processing and particulate leaching techniques to produce highly porous structures that have the potential to act as scaffolds for tissue engineering applications. The foamed structures moulded with polylactide (PLA) and polyvinyl alcohol (PVOH) with salt as the particulate were processed without the aid of organic solvents which can be detrimental to tissue growth. Macropores approximately 200 microns in

diameter and porosities of approximately 75% are reported and discussed. 18 refs.

Wisconsin-Madison UniversityUSA

Accession no. 1026231

Item 21Colloid and Polymer Science286, No.5, 2008, p.525HIGH SPIN/LOW SPIN PHASE TRANSITIONS OF A SPIN-CROSSOVER COMPLEX IN THE EMULSION POLYMERIZATION OF TRIFLUOROETHYLMETHACRYLATE (TFEMA) USING PVA AS A PROTECTIVE COLLOID

Suzuki A; Fujiwara M; Nishijima M

The magnetic properties of an Fe(II) spin-crossover complex near its high spin/low spin phase transition in the emulsion polymerisation of TREMA using PVAl as a protective colloid was investigated and comparisons made when sodium lauryl sulphate was employed as surfactant. The morphological properties of the emulsion particles were characterised by dynamic light scattering atomic force microscopy high resolution electron microscopy and scanning transmission electron microscopy. The effects of amine groups in the ligand and the central metal ion in the spin-crossover complexes in the emulsion particles on the high spin/low spin phase transition were also evaluated. The phase transition was considered to be bistable. 19 refs.

Shiga Prefecture University; Japan National Institutes of Natural Sciences; Tohoku UniversityJAPAN

Accession no. 1025915

Item 22Materiale Plastice45, No.2, 2008, p.217REFRACTIVE INDEX OF POLYVINYL ALCOHOL (PVA) ISOTROPIC FOILS MEASURED BY AN INTERFEROMETRIC METHOD BASED ON FABRY-PEROT ETALONDumitrascu L; Dumitrscu I; Dorohoi D-O

The theory behind and interferometric method for refractive index determination are described and the method which utilises a Fabry-Perot Etalon optical instrument is applied to the determination of the refractive index of PVAl films with and without small amounts of potassium iodide. 12 refs.

Jassy, Cuza Al.I. UniversityEASTERN EUROPE; RUMANIA

Accession no. 1025842

References and Abstracts

Item 23Polymer Degradation and Stability93, No.8, 2008, p.1554ELECTRON IRRADIATION INDUCED MICROSTRUCTURAL MODIFICATIONS IN BACL2 DOPED PVA: A POSITRON ANNIHILATION STUDYHarisha A; Ravindrachary V; Bhajantri R F; Ismayi; Sanjeev G; Poojary B; Dutta D; Pujari P K

Thin films of pure and 10wt% BaCl2 doped poly(vinyl alcohol) (PVA) were prepared by solution casting method. These films were subjected to electron irradiation for different doses ranging from 0 to 400kGy in air at room temperature. The effect of electron irradiation on the optical and free volume related microstructures of these polymer films was studied using positron annihilation lifetime spectroscopy FTIR and UV-vis techniques. The FTIR spectral studies indicate that the electron irradiation induces chemical modifications within the doped PVA which results in chain scission as well as cross-linking of the polymer. The positron lifetime study on these irradiated polymers shows that the chain scissions and cross-linking within the polymer matrix affect the free volume content and hence the microstructure. The UV-vis optical absorption studies show that the induced microstructural change by electron irradiation also modifies the optical properties. Using UV-vis spectra the optical energy band gap was estimated and it decreases with increase in electron dose. A correlation between positron results and optical results is obtained and electron irradiation induced microstructure modifications within the doped polymer are understood. The results highlight the usefulness of positron annihilation technique in the study of the microstructure of irradiated polymers. 25 refs.

Mangalore University; Bhabha Atomic Research CentreINDIA

Accession no. 1025565

Item 24European Polymer Journal44, No.8, 2008, p.2737SYNTHESIS OF ISOTACTIC STAR-SHAPED POLY(VINYL ALCOHOL)Jeon H J; Tak J P; Kim J H; Youk J H

Isotactic 6-armed star-shaped poly(vinyl alcohol) (PVA) with a narrow molecular weight distribution was successfully prepared by the living cationic polymerisation of 6-armed star-shaped poly(tert-butyl vinyl ether) (PTBVE) and subsequent acidic ether cleavage. The PTBVE was synthesised using hexa(chloromethyl) melamine (HCMM) as a hexafunctional initiator and ZnI2 or ZnCl2 as an activator in toluene/MC (1/1 v/v) at -70 deg.C. A better living stability of PTBVE was obtained in the ZnCl2 activator system. The number average molecular weight and the polydispersity index of the 6-armed star-shaped PTBVE polymerized with ZnCl2 at -70 deg.C for 24h were 156000g/mol and 1.47 respectively. The

fraction of the mm sequence of the resulting PVA was 52%. 15 refs.

Inha University; Yonsei UniversityKOREA

Accession no. 1025241

Item 25European Polymer Journal44, No.8, 2008, p.2489CELLULOSE WHISKERS REINFORCED POLYVINYL ALCOHOL COPOLYMERS NANOCOMPOSITESRoohani M; Habibi Y; Belgacem N M; Ebrahim G; Karimi A N; Dufresne A

Nanocomposite materials were prepared from copolymers of polyvinyl alcohol and polyvinyl acetate and a colloidal aqueous suspension of cellulose whiskers prepared from cotton linter. The degree of hydrolysis of the matrix was varied in order to vary the hydrophilic character of the polymer matrix and then the degree of interaction between the filler and the matrix. Nanocomposite films were conditioned at various moisture contents and the dynamic mechanical and thermal properties were characterized using dynamic mechanical analysis and differential scanning calorimetry respectively. Tensile tests were performed at room temperature to estimate mechanical properties of the films in the non linear range. All the results show that stronger filler/matrix interactions occur for fully hydrolyzed PVA compared to partially hydrolyzed samples. For moist samples a water accumulation at the interface was evidenced. The reinforcing effect was found to be all the higher as the degree of hydrolysis of the matrix was high. 40 refs.

Grenoble Institut National Polytechnique; Tehran UniversityEUROPEAN COMMUNITY; EUROPEAN UNION; FRANCE; IRAN; WESTERN EUROPE

Accession no. 1025219

Item 26Journal of Membrane Science322, No.1, 2008, p.74MODIFICATION AND CHARACTERIZATION OF SEMI-CRYSTALLINE POLY(VINYL ALCOHOL) WITH INTERPENETRATING POLY(ACRYLIC ACID) BY UV RADIATION METHOD FOR ALKALINE SOLID POLYMER ELECTROLYTES MEMBRANEJen Ming Yang; Hung Zen Wang; Chun Chen Yang Chang

Semi-crystalline poly(vinyl alcohol) was modified by UV radiation with acrylic acid monomer to get interpenetrating poly(acrylic acid) modified poly(vinyl alcohol) PVAAA membrane. The stability of various PVAAA membranes in water 2M CH3OH 2M H2SO4 and 40 wt% KOH aqueous media were evaluated. It was found that the stability of PVAAA membrane is stable in 40 wt% KOH

References and Abstracts

solution. The PVAAA membranes were characterized by differential scanning calorimetry X-ray diffraction and thermogravimetry analysis. These results show that (1) the crystallinity in PVAAA decreased with increasing the content of poly(acrylic acid) in the PVAAA membranes. (2) The melting point of the PVAAA membrane is reduced with increasing the content of poly(acrylic acid) in the membrane. (3) Three stages of thermal degradation were found for pure PVA. Compared to pure PVA the temperature of thermal degradation increased for the PVAAA membrane. The various PVAAA membranes were immersed in KOH solution to form polymer electrolyte membranes PVAAA-KOH and their performances for alkaline solid polymer electrolyte were conducted. At room temperature the ionic conductivity increased from 0.044 to 0.312 S/cm. The result was due to the formation of interpenetrating polymer chain of poly(acrylic acid) in the PVAAA membrane and resulting in the increase of charge carriers in the PVA polymer matrix. Compared to the data reported for different membranes by other studies our PVAAA membrane are highly ionic conducting alkaline solid polymer electrolytes membranes. 41 refs.

Gung University; Taipei Ming Chi University of TechnologyTAIWAN

Accession no. 1024307

Item 27Polymeric Materials: Science & Engineering2008, p.539ESTABLISHMENT OF NANOFIBER PREPARATION TECHNIQUE BY ELECTROSPINNINGMiyake H; Higashiyama Y; Yamash*ta Y

Some nanofibre electrospinning practical difficulties and their solutions are briefly discussed. Issues discussed include: the anti-bacterial effect of titania in poly(ethylene terephthalate); nozzle blockage when electrospinning concentrated chloroform solutions of poly(lactic acid); increasing output by using multiple nozzles but which increases the difficulty of solvent removal and nozzle cleaning; and the deposition of nonwoven fibre in thicknesses > 10 mm. 5 refs.

Shiga PrefectureUniversityJAPAN

Accession no. 1023887

Item 28European Polymer Journal44, No.7, 2008, p.2146IMPROVED OXYGEN BARRIER PERFORMANCE OF POLY(VINYL ALCOHOL) FILMS THROUGH HYDROGEN BOND COMPLEX WITH POLY(METHYL VINYL ETHER-CO-MALEIC ACID)

Labuschagne P W; Germishuizen W A; C Verryn S M; Moolman F S

Hydrogen bonding between poly(methyl vinyl ether-co-maleic acid) (PMVE-MA) and poly(vinyl alcohol) (PVOH) has resulted in films with lower oxygen transmission rates (OTR) than pure PVOH. In the range 20-30% (w/w) PMVE-MA complexation between the two polymers in the blend was maximized as shown by viscometry Fourier Transform Infrared Spectroscopy (FTIR) and Differential Scanning Calorimetry (DSC) analysis. OTR measurements have shown that the maximum interpolymer complexation ratio also correlates with the lowest OTR values of the resulting film. The improved oxygen barrier properties are believed to be a combination of the relatively intact PVOH crystalline regions as shown with X-ray diffraction (XRD) and a higher degree of hydrogen bonding in the amorphous regions of the PVOH and PMVE-MA films as indicated by glass transition temperature (Tg) shifts. This leads to denser amorphous regions that reduces the rate of gases diffusing through the polymer film hence the reduced OTR. 27 refs. Copyright (c) 2008 Elsevier Ltd.

CSIR; Pretoria UniversitySOUTH AFRICA

Accession no. 1023538

Item 29Polymer Materials Science and Engineering24, No.4, 2008, p.128PREPARATION OF PVA FLUORESCENCE FIBER AND GLUTARALDEHYDE ACETALIZATIONYuan Sun; Xin-Hua Deng; Dong-Cai Bian

A photochromic pigment was blended with a solution of PVAl and fluorescent fibres produced therefrom by wet spinning. The fibres were acetalised with glutaraldehyde and the hot water resistance tensile strength fracture behaviour and fluorescence of the acetalised fibres investigated and compared with the unacetalised fibres. The acetal fibres exhibited green fluorescence upon excitation with UV light. 7 refs.

Tianjin Polytechnic UniversityCHINA

Accession no. 1023258

Item 30Journal of Macromolecular Science AA45, No.4-6, 2008, p.271MISCIBILITY STUDIES ON CHITOSAN/POLY(VINYL ALCOHOL) BLENDS

The miscibility of blends of chitosan with various proportions of poly(vinyl alcohol)(PVA) in buffer solution was investigated at several different temperatures by measurements of viscosity ultrasonic velocity density and refractive index. Based on the viscosity data the interaction and thermodynamic parameters were calculated to determine the miscibility of the blend in solution and the

References and Abstracts

effects of blend composition on miscibility are discussed in terms of interactions between carbonyl groups of chitosan and hydroxyl groups of PVA. 29 refs.

Kuvempu University; Mysore UniversityINDIA

Accession no. 1022864

Item 31PMSE Preprints98, 2008, p.670PREPARATION AND CHARACTERIZATION OF HYDROXYETHYL CHITOSAN (HEC)/POLYVINYL ALCOHOL (PVA) COMPOSITE MEMBRANEZheng H; Zou X; Wang S

Membranes comprising blends of hydroxyethylchitosan and poly(vinyl alcohol) were prepared by casting solutions containing various amounts of the two polymers. The composite membranes showed good mechanical properties and because of the good biocompatibility of the component polymers the membranes are potentially useful as controlled-release membranes in transdermal drug-delivery systems. 11 refs.

Wuhan University of TechnologyCHINA

Accession no. 1022833

Item 32PSME Preprints98, 2008, p.666PREPARATION AND CHARACTERIZATION OF PHYSICALLY CROSSLINKED POLY(VINYL ALCOHOL)/CARBOXYMETHYL CELLULOSE HYDROGELSGuanghua He; Hua Zheng; Fuliang Xiong; Runxiang Zhao

Phys ica l ly c ross l inked po ly(v iny l a lcohol ) /carboxymethylcellulose (PVA/CMC) hydrogels were prepared by means of several freeze/thaw cycles and their structure and morphology was characterised by means of IR spectroscopy scanning electron microscopy and differential scanning calorimetry. The CMC and PVA showed good miscibility in the composite hydrogels and the CMC perturbed the formation of PVA crystallites. The composites hydrogels showed good pH-sensitive properties in a basic environment and the swelling rate increased with increasing CMC content at a pH of 7.4 whereas higher freeze/thaw cycle times resulted in a lower swelling rates. 8 refs.

Wuhan University of TechnologyCHINA

Accession no. 1022832

Item 33Plastics Science and Technology36, No.6, 2008, p.44

EFFECT OF PVA ON PROPERTIES OF STARCH/CHITOSAN OXALATE COMPOSITE AND ITS FILMLin Baofeng; Wang Wei; Du Yumin; Li Lei

Starch/chitosan oxalate composites containing various amounts of PVAl and films thereof were prepared and the viscosity dehydration rate particle size distribution structure heat stability and compatibility of the composites investigated as a function of PVAl content. 13 refs.

Guangxi University; Wuhan UniversityCHINA

Accession no. 1022498

Item 34Polymer49, No.13-14, 2008, p.3176STRUCTURAL RELAXATION OF POLYVINYL ACETATE (PVAC)Svoboda R; Pustkova P; Malek J

Structural relaxation of polyvinyl acetate (PVAc) was studied by mercury dilatometry and differential scanning calorimetry. Tool-Narayanaswamy-Moynihan (TNM) and Adam-Gibbs-Scherer (AGS) models were used to fit numerous experimental data. Single set of volume and enthalpy relaxation parameters describing all performed experiments was found for each model. Comparison of volume and enthalpy relaxation was made on the basis of TNM parameter values. The famous volume relaxation measurements made by Kovacs [Fortschr Hochpolym Forsch 1963; 3:394-507] were successfully fitted using the same set of parameters. Furthermore several non-fitting methods of TNM parameters' estimation (including e.g. peak-shift method or inflectional analysis) were applied to our data and their critical comparison is outlined. For most methods a good agreement with curve-fitting results was achieved. 47 refs.

Pardubice UniversityCZECH REPUBLIC

Accession no. 1022151

Item 35Polymer Degradation and Stability93, No.7, 2008, p.1323SYNERGISTIC EFFECT OF AMMONIUM POLYPHOSPHATE AND LAYERED DOUBLE HYDROXIDE ON FLAME RETARDANT PROPERTIES OF POLY(VINYL ALCOHOL)Zhao C X; Liu Y; Wang D Y; Wang D L; Wang Y Z

A novel flame retardant system of poly(vinyl alcohol) (PVA) is prepared via using ammonium polyphosphate (APP) and layered double hydroxide (LDH). The flammability of PVA composites containing APP-based LDH at a 15wt.% global percentage showed that the flame retardancy of all PVA/APP/LDH samples increase with the increase of LDH concentration in the range of

References and Abstracts

0.1-1.0wt.% and reach a LOI value of up to 33 and UL-94 V-0 rating for most composites. Thermo-gravimetric analysis reveals that PVA/APP/LDH samples show higher initial decomposition temperature in comparison with PVA/APP composite. The morphology and structures of residues generated during LOI test were investigated by scanning electronic microscopy (SEM). Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) were used to analyze the composition of the residue formed after thermo-oxidation to support a fundamental analysis for the mechanism of char formation. The test of mechanical properties demonstrated that LDH can enhance tensile strength Young's modulus and elongation at break of PVA/APP composites. 40 refs.

Sichuan UniversityCHINA

Accession no. 1022123

Item 36Journal of Membrane Science319, No.1-2, 2008, p.298EFFECT OF VARYING POLY(STYRENE SULFONIC ACID) CONTENT IN POLY(VINYL ALCOHOL)-POLY(STYRENE SULFONIC ACID) BLEND MEMBRANE AND ITS RAMIFICATION IN HYDROGEN-OXYGEN POLYMER ELECTROLYTE FUEL CELLSSahu A K; Selvarani G; Bhat S D; Pitchumani S; Sridhar P; Shukla A K; Narayanan N; Banerjee A; Chandrakumar N

Poly(styrene sulphonic acid) (PSSA) content in poly(vinyl alcohol) (PVA) and PSSA blend membrane is varied and its effect on proton conductivity is studied at varying relative humidity (RH) values. The maximum proton conductivity is observed for the PVA-PSSA membrane with about 35 wt% PSSA at all humidity values. At 30% RH value the conductivity of PVA-PSSA blend membrane is 1.20x10^-^3 S/cm which is about two orders of magnitude higher than the conductivity value of 2.27x10^-^5 S/cm observed for pristine PVA membrane. Water self-diffusion coefficients and water release kinetics of these materials have been characterized by nuclear magnetic resonance (NMR) imaging technique which validate the use of this membrane in polymer electrolyte fuel cells (PEFCs). A peak power density of 210 mW/cm^2 at a load current-density of 500 mA/cm^2 is achieved for the PEFC with the optimized PVA-PSSA membrane as electrolyte compared to a peak power density of only 38 mW/cm^2 observed at a load current-density of 80 mA/cm^2 for the PEFC with pristine PVA membrane as electrolyte while operating at 75 deg.C with H2 and O2 feeds to the fuel cell maintained at atmospheric pressure. 29 refs.

India Central Electrochemical Research Institute; Indian Institute of Science; Indian Institute of TechnologyINDIA

Accession no. 1022084

Item 37Materials Letters62, No.20, 2008, p.3555ELECTROSPUN CROSSLINKED POLYVINYL ALCOHOL MEMBRANEEnlong Yang; Xiaohong Qin; Shanyuan Wang

The electrospinning of polyvinyl alcohol (PVA) was performed with maleic anhydride (MA) as a cross linker to fabricate slightly soluble nanofibre membrane. The solubility morphology and thermal behaviour of electrospun PVA and PVA/MA membranes were characterized by water durability test scanning electron microscope (SEM) and differential scanning calorimeter (DSC) respectively. Water durability test demonstrated that 8% PVA/MA (20/1 mole/mole) membrane had the least average mass loss and standard deviation. SEM images showed that fibres in PVA/MA membrane had a larger average diameter compared to those in PVA membrane. DSC investigated that crystal structure was formed in PVA/MA membrane. The results show that rapid evaporation of water and high electric field during electrospinning process may promote crosslinking of PVA and MA. 15 refs.

Shanghai Donghua UniversityCHINA

Accession no. 1022066

Item 38Wacker World Wide8, No.1, 2008, p.10SPARKLING MURAL ENHANCEMENTS

The commercial development of new creative designs of wall-coverings with a unique appearance and distinctive light effects by incorporation of proprietary poly(vinyl acetate)(PVAC) beads of various grain sizes is described. The light effects are discussed in terms of the particle shape size and optical brilliance of the PVAC particles. No refs.

Wacker Chemie GmbHEUROPEAN COMMUNITY; EUROPEAN UNION; GERMANY; WESTERN EUROPE

Accession no. 1020656

Item 39ICIS Chemical Business273k, No.21, 2008, p.50CHEMICAL PROFILE: VINYL ACETATEBurridge E

Vinyl acetate monomer is mainly used in PVA which has applications in water-based paints adhesives acrylic fibres paper coatings and non-woven binders. PVOH used in packaging film and glass laminates is the second-largest user. Supply in Europe has returned to more normal levels following an unprecedented series of outages last year that tightened global markets. Stocks have recovered and availability is good but demand has weakened in the second quarter as the economic slowdown hits consumption

References and Abstracts

notably in the paints and adhesives sector. Most end-use markets are mature and growth in the largest applications are tipped to track GDP or slightly below. There is strong growth in EVOH barrier resins EVA polymers and PVB although these are smaller-volume products.

EUROPE-GENERAL;USA

Accession no. 1020542

Item 40Polymer Engineering and Science48, No.5, 2008, p.853MULTIOBJECTIVE OPTIMIZATION OF POLYMERIZATION REACTION OF VINYL ACETATE BY GENETIC ALGORITHM TECHNIQUE WITH A NEW REPLACEMENT CRITERIONSadi M; Dabir B; Shahrabadi A

A multiobjective optimisation procedure based on genetic algorithm has been developed to determine optimum operational conditions of polymerisation reaction. In this article by using a new selection criterion to choose the next generation members with better quality optimisation efficiency is improved and the number of generations to obtain Pareto optimal set reduced. In this proposed method a novel replacement criterion based on ranking level information and proximity of solutions to the Pareto optimal front is used to choose the next generation members. The polymerisation of vinyl acetate has been chosen as an example. Two objective functions which used in this study are maximization of the weight average molecular weight up to the desired value and minimization of the residual initiator concentration. A Pareto optimal set of objective functions has been obtained by application of a Pareto set filter operator. Furthermore the influence of genetic algorithm parameters on the efficiency and convergence of genetic algorithm is studied by changing cross over and mutation probabilities. Because of the flexibility and generality of genetic algorithm this optimisation method is a useful technique with lots of potentials in determination of optimum value of operation parameters. 31 refs.

Amir Kabir University of TechnologyIRAN

Accession no. 1019157

Item 41Polymer Degradation and Stability 93, No.4, 2008, p.800THE THERMAL DEGRADATION OF POLY(VINYL ACETATE) AND POLY(ETHYLENE-CO-VINYL ACETATE) PART I: EXPERIMENTAL STUDY OF THE DEGRADATION MECHANISMRimez B; Rahier H; Van Assche G; Artoos T; Biesemans M; Van Mele B

The thermal degradation mechanism of poly(vinyl acetate) (PVAc) and poly(ethylene-co-vinyl acetate) (EVA) copolymers was investigated with solid-state NMR thermogravimetry coupled with mass spectrometry and differential thermal analysis. Between 300 and 400 deg.C acetic acid is eliminated (deacetylation) leaving a highly unsaturated residue or polyene. The deacetylation of PVAc is autocatalytic. Upon incorporation of ethylene entities into the polymer backbone autocatalysis disappears. Between 400 and 500 deg.C the polyene will degrade further by chain scission reactions in inert conditions or aromatise in an oxidative environment into a char and oxidised eventually into CO2 beyond 500 deg.C. In inert conditions the deacetylation step as well as the chain scission reaction shows endothermic effects. In an oxidative environment large exothermal effects are found for each degradation step. This indicates the occurrence of additional oxidation reactions during deacetylation an important reorganisation of the polyene during char formation and oxidation of the latter into CO2. 22 refs.

Brussels Vrije UniversiteitBELGIUM; EU; EUROPEAN COMMUNITY; EUROPEAN ECONOMIC COMMUNITY; EUROPEAN UNION; WESTERN EUROPE; WESTERN EUROPE-GENERAL

Accession no. 1018792

Item 42Materiale Plastice45, No.1, 2008, p.106ORDER DEGREE OF POLYVINYL ALCOHOL (PVA) FILMS ESTIMATED BY A SPECTRAL METHODDorohoi D O; Dumitrascu L; Dumitrascu I

Polyvinyl alcohol films were coloured with pyridinium ylides dried and stretched under heating. The visible electronic spectra of the stretched films under linearly polarised visible radiation were studied with the electric field intensity parallel and perpendicular to the stretching direction and the effect of the degree of stretching on the dichroism of the coloured films evaluated. A linear dependence between film birefringence and the degree of order of small molecules was established. 14 refs.

Jassy Cuza Al.I. UniversityEASTERN EUROPE; RUMANIA

Accession no. 1018410

Item 43Macromolecules41, No.7, 2008, p.2368ORGANO-COBALT MEDIATED LIVING RADICAL POLYMERIZATION OF VINYL ACETATEPeng C H; Scricco J; Li S; Fryd M; Wayland B B

Polymerisation of vinyl acetate initiated by sources of azo-radicals in the presence of cobalt(II) tetramesitylporphyrin [(TMP)Co] showed an induction period followed by an

References and Abstracts

organocobalt-mediated living radical polymerisation (LRP). The induction period corresponded to the conversion of (TMP)Co into an organocobalt porphyrin derivative. The living character of the polymerisation at low vinyl acetate conversions was demonstrated by a linear increase in molecular weight with conversion the production of hom*opolymers of relatively low polydispersity and the formation of block copolymers with methyl acrylate. Deviations from ideal LRP occur as a result of radical termination and chain-transfer events at moderate conversion of vinyl acetate (VAc). Mechanistic studies showed that the radical polymerisation of VAc is controlled by a degenerative transfer mechanism involving organocobalt complexes as the transfer agents. Radical polymerisation reactions of vinyl acetate and methyl acrylate mediated by organocobalt complexes were compared by means of kinetic studies. 25 refs.

Pennsylvania UniversityUSA

Accession no. 1018009

Item 44Polymer Testing27, No.3, 2008, p.360EFFECT OF SILICA NANOFILLERS ON ISOTHERMAL CRYSTALLIZATION OF POLY(VINYL ALCOHOL): IN-SITU ATR-FTIR STUDYLee J; Jin Lee K; Jang J

Isothermal crystallisation behaviour of poly(vinyl alcohol) (PVA) in the presence and absence of silica nanoparticles was systematically investigated using in-situ attenuated total reflectance Fourier-transform infrared (ATR-FTIR) spectroscopy. The content size and surface characteristics of silica nanoparticles were considered as main factors affecting the crystallisation behaviour and the effect of annealing time and temperature was also examined. First very low concentrations of silica nanoparticles (less than 0.5 wt%) could accelerate the crystallisation process whereas higher silica loadings reduced the degree of crystallisation. In the PVA/silica (0.5 wt%) nanocomposites 22-nm silica nanoparticles provided the most suitable interparticle space for nucleation and crystal growth. Compared with hydrophobic silica nanoparticles hydrophilic silica nanoparticles are favourable to achieve higher crystallinity due to the increased chemical affinity in the nanocomposites. The degree of crystallisation became higher with increasing annealing time and it was also enhanced in a high-temperature region. When 0.5 wt% of 22-nm silica nanoparticles was used as a nucleating agent for the crystallisation of PVA the crystallinity of nanocomposites was ca. 20% higher than that of pristine PVA. 70 refs.

Seoul National UniversityKOREA

Accession no. 1017945

Item 45CSIRO Composites Science and Technology68, No.6, 2008, p.1453KEY INTERACTIONS IN BIODEGRADABLE THERMOPLASTIC STARCH/POLY(VINYL ALCOHOL)/MONTMORILLONITE MICRO- AND NANOCOMPOSITESDean K M; Do M D; Petinakis E; Yu L

A series of thermoplastic starch/poly(vinylalcohol)(PVOH)/montmorillonite (Na-MMT) micro- and nanocomposites which exhibit intercalated and highly exfoliated structures have been developed. Fourier transform infrared (FTIR) spectra of the thermoplastic starch and starch nanocomposites showed a number or variants in H-bonding between starch chains PVOH and Na-MMT during extrusion processing. The addition of small amounts of PVOH to the starch nanocomposite produced a very ordered intercalated structure. The relative concentrations of PVOH and Na-MMT could be directly correlated to changes in intergallery spacings. Although good dispersion of clay platelets was important in improving mechanical properties in these nanocomposites the interfacial interactions of filler and matrix played just as important a role (the more agglomerated composites) containing both Na-MMT and PVOH showed significant increases in tensile strength (up to 67% increase) and tensile modulus (up to 85% increase) as compared to the more well dispersed composites without PVOH. The improvements in properties could be attributed to both interfacial interactions and the disruption of the retrogradation (recrystallisation process). 35 refs.AUSTRALIA

Accession no. 1017910

Item 46Polymer Preprints2008, 49, No.1, p.1073STIMULI-RESPONSIVE MECHANICALLY DYNAMIC POLYMER COMPOSITESShanmuganathan K; Capadona J R; Tyler D J; Rowan S J; Weder C

Nanocomposites were prepared from polyvinyl acetate and microcrystalline cellulose whiskers obtained from maritime biomass by solution mixing. Filler levels up to 20 weight percent were evaluated. Composites were compression moulded and samples were evaluated using dynamic mechanical thermal analysis and swelling measurements. Significant mechanical reinforcement of the PVAc was obtained above the glass transition temperature but swelling in water also increased with whisker density. 21 refs.

Case Western Reserve University; Cleveland Louis Stokes DVA Medical Center USA

Accession no. 1017338

References and Abstracts

Item 47Polymer Preprints2008, 49, 1, p.1040PAMPS/PVA ELECTROSENSITIVE HYDROGEL FIBRESXia Feng; Li Chen; Leilei Ju; Yiping Zhao; Jing Dong

Synthesis of hydrogel fibres by spinning and coagulation of blend fibre from mixed solutions of polyvinyl alcohol (PVOh) and polyacrylamidomethylpropane sulphonic acid (PAMPS) is described. Swelling properties and electrosensitive performance of loss of water under an applied voltage were investigated and it was observed that swelling ratio decreased with an increase in salt concentration in water. Some crosslinking between PAMPS and PVOh occurred due to generation sulphonic acid ester in the process. 9 refs.

Tianjin Polytechnic UniversityCHINA

Accession no. 1017320

Item 48Polymer Preprints2008, 49, 1, p.1032MODIFIED PVA AS THERMAL-RESPONSIVE POLYMERS FOR LAYER-BY-LAYER ASSEMBLYYuanfeng Pan; Hong Lu; Huining Xiao; Guanglei Zhao; Beihai He

Synthesis of vinyl alcohol-sodium acrylate copolymers and their subsequent treatment with acetaldehyde in acid solution resulted in vinyl alcohol copolymers with temperature responsive properties and good solubility at low temperatures. Copolymers were characterised using nuclear magnetic resonance spectroscopy atomic force microscopy and turbidity measurements. The effects of the degree of acetalysis and of molecular weight and comonomer ratios on lower critical solution temperature were examined. Layer by layer assembly on rayon fibre and on silicon wafers was examined and resulted in the surfaces becoming temperature sensitive. 5 refs.

South China University of Technology; New Brunswick UniversityCANADA; CHINA

Accession no. 1017316

Item 49Macromolecules41, No.4, 2008, p.1289EFFECT OF SILICA NANOPARTICLES ON THE LOCAL SEGMENTAL DYNAMICS IN POLY(VINYL ACETATE)Bogoslovov R B; Roland C M; Ellis A R; Randall A M; Robertson C G

Over a range of concentrations of nanosized silica particles mixed into polyvinyl acetate it was shown that although both bound and occluded filler levels increased

the thermal properties such as glass transition relaxation times and thermal expansion coefficient of the polymer was unaffected. Samples were evaluated using modulated differential scanning calorimetry transmission electron microscopy Mooney viscosity measurements and rheological measurements. 69 refs.

US Naval Research Laboratory; Bridgestone AmericasUSA

Accession no. 1016426

Item 50ACS Polymeric Materials: Science & Engineering, Spring Meeting 2007. PSME Preprints 96, 2007, p.722TEM STUDIES OF WHEAT GLUTEN/THIOLATED POLY(VINYL ALCOHOL) BLENDSDong J; Dicharry R; Parnasi R; Asandei A D

A reactive modifier for wheat gluten was synthesised based on a multifunctional polymeric thiol prepared by esterification of poly(vinyl alcohol) (PVA) with 3-sulphanylpropanoic acid and the morphology of the blends of the modifier with wheat gluten was examined by transmission electron microscopy. Blends of the thiolated PVA with wheat gluten mixtures showed a more hom*ogeneous morphology than did PVA/wheat gluten blends. The smaller domain size suggests that the wheat gluten and starch phases are mixed better in the presence of the thiolated PVA modifier which after reaction with the gluten behaves as a compatibiliser. 12 refs.

Connecticut UniversityUSA

Accession no. 1016300

Item 51ACS Polymeric Materials: Science and Engineering, Spring Meeting 2007PSME Preprints, Proceedings of a conference held Chicago I1, 25th-29th March96, 2007, p565.STRUCTURAL DIFFERENCES IN AEROGELS PREPARED WITH DIFFERENT CLAY MINERALSJohnson J R III; Schiraldi D A

Aerogels were prepared from sodium montmorillonite and refined and unrefined hectorite and used to produce composites with poly(vinyl alcohol) (PVA). Dioctahedral montmorillonite produced aerogels with a very low density with relatively poor mechanical properties. Trioctahedral hectorite produced a much-stronger aerogel and the PVA/hectorite aerogel composites were much stronger than the unsupported aerogel. 17 refs.

Case Western Reserve UniversityUSA

Accession no. 1015336

References and Abstracts

Item 52Journal of Materials Processing Tech.200, No.1-3, 2008, p.331SHEAR AND ELONGATIONAL FLOW PROPERTIES OF THERMOPLASTIC POLYVINYL ALCOHOL MELTS WITH DIFFERENT PLASTICIZER CONTENTS AND DEGREES OF POLYMERIZATIONLin C A; Ku T H

In this paper thermoplastic polyvinyl alcohol (TPVA) was prepared by plasticisation using glycerin which has good thermo-resistance and outstanding compatibility with polyvinyl alcohol (PVA). First the measurements of shear flow properties of TPVA with different plasticiser contents and degrees of polymerisation were performed and the analysis and evaluation of the rheological parameters including non-Newtonian index and flow activation energy were carried out. Results show that both the higher plasticiser contents and the lower degrees of polymerisation of TPVA lower the melt viscosity and led to an increase in non-Newtonian index and flow activation energy. Moreover the change in the plasticiser contents of TPVA had a larger effect on the variation in non-Newtonian index. There was also an obvious variation in the flow activation energy between the samples with different degrees of polymerisation. Furthermore the melt spinning method was used to test the elongational flow properties of TPVA. Test results indicate that the TPVA melts with higher plasticiser contents or lower degrees of polymerisation were higher in fibre velocity and elongation rate but lower in elongational resistance. Moreover the elongational resistance increased with an increasing elongation rate. Also it reached a plateau value exhibiting a downward concave curve except the sample with the lowest degree of polymerisation that exhibited a slight sigmoid curve. 20 refs.

Taiwan Feng Chia University; Toko UniversityTAIWAN

Accession no. 1015078

Item 53Polymer Materials Science and Engineering23, No.6, 2007, p.164THE EFFECT OF CROSSLINKING AGENTS ON THE CORN STARCH ACETATES AND PVA BIODEGRADABLE FILMS PROPERTIESGuang-Hua Zhang; Xiao-Feng Zhou; Zhi-Chao Lai ShanxiUniversity

Corn starch acetates with low degrees of esterification were synthesised by reacting corn starch with acetic acid/acetic anhydride and used in the manufacture of crosslinked biodegradable PVAl films. The effects of type of crosslinking agent glyoxal dosage cure temperature and cure time on film properties were studied and the microstructure particle shape degree of crystallinity and heat stability of the films determined by scanning electron microscopy X-ray diffraction and thermogravimetry. The

mechanical and water-retaining properties of the films were also investigated. 5 refs.

Shanxi UniversityCHINA

Accession no. 1014790

Item 54Industrial and Engineering Chemistry Research47, No.3, 2008, p.509EFFECTS OF REVERSIBLE ADDITION FRAGMENTATION TRANSFER ON BRANCHING IN VINYL ACETATE BULK POLYMERIZATIONPinto M A; Li R; Immanuel C D; Lovell P A; Schork F J

The formulation of a detailed mathematical model for branching due to chain transfer to polymer in reversible addition-fragmentation chain transfer (RAFT) polymerisation of vinyl acetate is described in which the traditionally accepted mechanism for RAFT polymerisation is modified by inclusion of a relaxation process. Based on the detailed model numerical studies were undertaken to demonstrate the effectiveness of the proposed mechanism as an explanation for the observed reduction in branching in RAFT polymerisation. 70 refs.

London Imperial College of Science Technology & Medicine; Georgia Institute of Technology; Manchester University; Maryland UniversityEUROPEAN COMMUNITY; EUROPEAN UNION; UK; USA; WESTERN EUROPE

Accession no. 1014335

Item 55Journal of Applied Polymer Science108, No.1, 2008, p.34STRUCTURE AND PROCESSABILITY OF IODINATED POLY(VINYL ALCOHOL). IV. DRAWABILITY OF THE FILMS IODINATED AT SOLUTION BEFORE CASTINGShin E J; Lee Y H; Choi S C PusanDong-A

The drawability of films of poly(vinyl alcohol) (PVA) films iodinated in solution before casting from aqueous solutions of 10 wt % PVA was examined at 20-60 degC. The yield and breaking loads were much lower and the breaking elongation was higher than the corresponding values for untreated PVA films and unoriented PVA films iodinated after casting. The maximum draw ratios of the films with weight gains of 15.2 39.8 83.2 117 and 140.1% were 4.5 5.5 8.5 8.0 and 7.5 respectively at 20 degC. The crystallinity of all the films increased at the maximum draw regardless of the crystallinity before drawing. The crystalline structure returned to that of the original PVA crystalline lattice on deiodination. The amorphous orientation and initial modulus increased with the maximum draw ratio whereas the orientation of crystals was constant. The orientation and moduli increased up to a weight gain of 83.2% for which the highest draw ratio and initial modulus were 8.5 and 7.1 GPa respectively and

References and Abstracts

then decreased. 9 refs.

University; Pusan National UniversitySOUTH KOREA

Accession no. 1014189

Item 56CNRS Journal of Polymer Science: Polymer Chemistry Edition46, No.6, 2008, p.2062METAL NANOCOMPOSITE FILMS PREPARED IN SITU FROM PVA AND SILVER NITRATE. STUDY OF THE NANOSTRUCTURATION PROCESS AND MORPHOLOGY AS A FUNCTION OF THE IN SITU ROUTESClemenson S; Leonard D; Sage D; David L; Espuche E

Cast-hybrid films composed of PVAL and silver nitrate were treated by thermal annealing UV irradiation and chemical reduction by a borohydride solution to obtain nanocomposite films. The nanostructuration process was studied as a function of the treatment conditions and discussed as a function of the mobility state of the polymer chains in the nanocomposite matrix during treatment. A hom*ogeneous dispersion of crystalline silver nanoparticles was obtained by thermal annealing above and below Tg. Different morphology and silver conversion were achieved by chemical reduction in a borohydride solution. 29 refs.EUROPEAN COMMUNITY; EUROPEAN UNION; FRANCE; WESTERN EUROPE

Accession no. 1013786

Item 57Plastics Rubber and Composites36, No.6, 2007, p.254EFFECT OF PVA CONTENT ON MORPHOLOGY SWELLING AND MECHANICAL PROPERTY OF CROSSLINKED CHITOSAN/PVA NANOFIBREZhou Y S; Yang D Z; Nie J

The fabrication of crosslinked chitosan/poly(vinyl alcohol) blend nanofibres via electrospinning with heat mediated chemical crosslinking using triethylene glycol diacrylate as crosslinking agent and the characterisation of their structure morphology and mechanical properties by ATR-FTIR SEM and tensile testing is described. The effects of PVA content on morphology swelling and mechanical properties of the products were investigated and the results are discussed in terms of intermolecular hydrogen bonding and potential applications in tissue engineering. 30 refs.

Wuhan University; Beijing University of Chemical TechnologyCHINA

Accession no. 1013527

Item 58Materials Letters

62, No.6-7, 2008, p.828THERMAL RADIATIVE PROPERTIES OF ELECTROSPUN SUPERFINE FIBROUS PVA FILMSHuijun Wu; Jintu Fan; Xiaohong Qin; Guoge Zhang

This paper reports on an experimental investigation of the thermal radiative properties of electrospun superfine fibrous PVA films containing or without containing TiO2 nanoparticles. Fourier transform infrared spectroscopy was used to measure the spectral transmission of the superfine fibrous PVA films from which the Rosseland extinction coefficients and thermal radiative conductivities of the samples were then calculated. The results showed that electrospun fibrous PVA and PVA/TiO2 films had significantly greater Rosseland extinction coefficients and lower thermal radiative conductivities than the conventional polymer foams (e.g. PE and PU). The field emission scanning electron microscopy (FE-SEM) images showed that the electrospun PVA fibres had the diameters in range of 150-300 nm. The super fineness of the fibres in the PVA films is believed to be the main reason for the reduction of thermal radiative conductivity. The study also showed that the addition of TiO2 nanoparticles can increase the thermal insulating performance of the electrospun fibrous materials. 17 refs.

Hong Kong Polytechnic University; Shanghai Donghua UniversityB.V. CHINA; HONG KONG

Accession no. 1013062

Item 59ACS Polymeric Materials: Science & Engineering. Fall Meeting, 2007PSME Preprints, Proceedings of a conference held Boston, MA, 19th-23rd Aug97, 2007, p.26NOVEL SEMI-CRYSTALLINE PVA HYDROGEL AS LOAD-BEARING CARTILAGE SUBSTITUTEBodugoz-Senturk H; Oral E; Jeeyoung Choi; Jean Hsiang Kung; Macias C E; Muratoglu O K

Highly creep resistant poly(vinyl alcohol) (PVA)-poly(ethylene glycol) (PEG) gels were prepared by a combination of the theta-gel process (which is based on solvent driven gelation) dehydration and high-temperature annealing. The PVA gels containing PEG maintained their opacity through annealing and showed large pores under confocal imaging whereas the hydrogels which did not contain PEG turned translucent and no pores were visible. Thus the use of PEG during thermal annealing was beneficial in maintaining a high equilibrium water content. These PVA-PEG hydrogels were potentially useful as load-bearing cartilage substitutes. 2 refs.

References and Abstracts

Massachusetts General HospitalUSA

Accession no. 1012836

Item 60Plastics Rubber and Composites36, No.7-8, 2007, p.283NEW TECHNOLOGY FOR THERMAL PROCESSING OF POLY(VINYL ALCOHOL)Chen N; Li L; Wang Q

To improve the thermal processability of poly(vinyl alcohol) (PVA) the use of water and an (unspecified) amido group-containing compound (Ac) that has a complementary structure to PVA and can complex to it through hydrogen bonding was examined. Water and Ac can control the supramolecular structure of PVA confine its crystallisation and decrease its melting point thereby widening the window for thermal processing of PVA. In this way melt spinning of PVA fibres extrusion blowing of PVA films and extrusion blow moulding of PVA containers can be realised to give high-performance PVA fibres with a tensile strength of over 1.9 GPa blown films with good mechanical properties and transparency and PVA containers with good gasoline-barrier properties and thermal resistance. Compared with conventional wet processing of PVA solution the thermal processing technology adopted for modified PVA is much simpler more effective and cheaper. 41 refs.

Sichuan UniversityCHINA

Accession no. 1012293

Item 61Journal of Polymer Science: Polymer Chemistry Edition46, No.1, 2008, p.203PREPARATION AND CHARACTERIZATION OF MONODISPERSE SUPERPARAMAGNETIC POLY(VINYL ALCOHOL) BEADS BY REVERSE SPRAY SUSPENSION CROSSLINKINGChengli Yang; Yueping Guan; Jianmin Xing; Guobin Shan; Huizhou Liu

Magnetic poly(vinyl alcohol) (PVA) beads were prepared by a reverse spray suspension crosslinking process. Hydrophilic nanoparticles of Fe3O4 were mixed with PVA glutaraldehyde and water to form an aqueous phase that was sprayed into vegetable oil under nitrogen pressure to form a water-in-oil emulsion that was then crosslinked by addition of hydrochloric acid as a catalyst. The resulting magnetic PVA beads showed good properties when the PVA concentration was 10% and the oil phase temperature was controlled at 40 degC. The magnetic PVA beads were monodisperse and had a high saturation magnetisation. Fourier transform infrared and X-ray photoelectron spectroscopy showed that proved that Cibacron Blue molecules could be covalently immobilised on the surfaces

of the magnetic PVA beads. Protein affinity separation experiments showed that the magnetic PVA beads may be useful as carriers for large-scale protein separation. 210 refs.

Beijing Chinese Academy of Sciences; Georgetown University; Beijing University of Science & TechnologyCHINA; USA

Accession no. 1011490

Item 62European Polymer Journal43, No.12, 2007, p.4882MICROSTRUCTURE AND FREE VOLUME EVALUATION OF POLY(VINYL ALCOHOL) NANOCOMPOSITE HYDROGELSParanhos C M; Soares B G; Machado J C; Windmoller D; Pessan L A

A new type of organic/inorganic nanocomposite hydrogel was prepared by introducing small amount of natural montmorillonite (MOM) into a poly(vinyl alcohol) (PVA)/sulphonated polyester (PES) system. The crystalline structure and crystallinity degree were determined by differential scanning calorimetry (DSC) and wide angle X-ray spectroscopy (WAXS). The presence of PES leads to an increase in the crystallinity degree of the PVA matrix and a significant decrease in the melting temperature. The addition of small amount of clay (1-5%) resulted in an increase of the average crystallite dimension crystallinity degree and melting temperature as compared to the PVA/PES system. The presence of the clay resulted in a substantial increase on the free volume size as suggesting by positron annihilation lifetime spectroscopy (PALS). This result suggests a lower packing efficiency of the PVA chain and the formation of a PVA-MOM interfacial layer. This interfacial layer and the increasing of the mobility of the PVA chain by the presence of the clay reflects also in a decrease of the glass transition temperature determined by dynamic mechanical analysis. 42 refs.

Rio de Janeiro Universidade Federal; Minas Gerais Universidade Federal; Sao Carlos Universidade FederalBRAZIL

Accession no. 1011204

Item 63Journal of Applied Polymer Science107, No.4, 2008, p.2509CYCLIC UREAS AS SOLVENTS FOR ESTERIFICATION OF POLY(VINYL ALCOHOL) AND VINYL ACETATE-VINYL ALCOHOL COPOLYMERS WITH ACID CHLORIDESFernandez M D; Fernandez M J

Esterification of polyvinyl alcohol (PVAl) or polyvinyl acetate (PVAc) using dinitrobenzoyl chloride in a dimethylpropyleneurea solvent resulted in the associated vinyl nitrobenzoate copolymer. Copolymers were characterised using Fourier transform infrared spectroscopy

References and Abstracts

differential scanning calorimetry and determination of the degree of alcoholysis by both nuclear magnetic resonance spectroscopy and titration. Whilst copolymers formed from PVAc were blocky those from PVAl proved to be random. Changes of glass transition temperature with composition were linear in the case of the PVAC and PVAc derived copolymers but displayed a negative deviation in the case of the PVAl and PVAl copolymers. 29 refs.

Pais Vasco UniversidadEUROPEAN COMMUNITY; EUROPEAN UNION; SPAIN; WESTERN EUROPE

Accession no. 1010613

Item 64Reactive and Functional Polymers68, No.1, 2008, p.133SWELLING AND VISCOELASTIC PROPERTIES OF POLY(VINYL ALCOHOL) PHYSICAL GELS SYNTHESIZED USING SODIUM SILICATEMitsumata T; Hasegawa C; Kawada H; Kaneko T; Takimoto J I

A physically crosslinked poly(vinyl alcohol) (PVA) gel was synthesised from mixed aqueous solutions of PVA and sodium silicate (SS) using freeze/thaw techniques. The infrared spectroscopy swelling and viscoelastic properties of the resultant gel have been investigated. The infrared spectrum of the resultant gel was as in the spectrum of PVA gel without SS. The resultant gel showed that the absorbing band due to stretching of hydroxyl groups shifted to a lower wave number indicating the enhancement of hydrogen bonding between hydroxyl groups in PVA. Dynamic viscoelastic measurements showed that the storage modulus of the resultant gel was 1 order of magnitude higher than that of PVA gel without SS. The degree of swelling Q varied with the SS concentration cSS as Q~CSS-v (0.12 < and < 0.37). The storage modulus at 1Hz E' changed by the degree of swelling Q satisfying with a power low as E'~Q-3.8. Microphotographs of the gels in a dry state showed that PVA network developed extensively as increasing the SS concentration. These results obtained strongly indicate that the resultant gel consists from only PVA not composites of PVA and SS. It can be considered that SS hastens the aggregation or crosslinking of PVA chains; as a result physically crosslinked gels with close network and high elasticity were obtained. Reswelling experiment showed that the degree of swelling by the reswelling for the resultant gel was approximately 10 which was less than 1/6 of the original value of the degree of swelling. 13 refs. JAPAN

CREST; AIST; Yamagata University; JAPAN

Accession no. 1010275

Item 65Polymer International57, No.1, 2008, p.35

THE EFFECT OF NANOSCALE VANADIUM PENTOXIDE ON THE ELECTRICAL AND MECHANICAL PROPERTIES OF POLY(VINYL ALCOHOL)Mahmoud W E; Hafez M; El-Aal N A; El-Tantawy F

Poly(vinyl alcohol) (PVA) loaded with vanadium pentoxide (V2O5) nanoparticles is successfully prepared at room temperature and ambient pressure. Transmission electron microscopy is used to characterise the final product. It is found that V2O5 nanoparticles are well dispersed and uniform in shape and that the diameter of the particles is confined to within 8 nm. Addition of small amounts (0.2-1 wt%) of nanoparticulate V2O5 to PVA increases the electrical conductivity as well as the elastic modulus. The deformation behaviour after preparing the nanocomposites irrespective of V2O5 concentration is similar to that of the unfilled elastomer implying that the mechanism of large deformation is mainly governed by the matrix. 22 refs.

Suez Canal UniversityEGYPT

Accession no. 1009328

Item 66Macromolecules40, No.24, 2007, p.8750GELATION-INDUCED PHASE SEPARATION OF POLY(VINYL ALCOHOL) IN MIXED SOLVENTS OF DIMETHYL SULFOXIDE AND WATERTakahashi N; Kanaya T; Nishida K; Kaji K

Time-resolved light-scattering measurements are performed on poly(vinyl alcohol) (PVA) in mixed solvents of dimethyl sulphoxide (DMSO) and water with various mixing ratios after quenching from 100 to 25 deg.C to examine the physical gelation process. A broad scattering peak characteristic of phase separation appears in the light-scattering profiles after a certain incubation time and the peak position moves to higher values with annealing time. The results contradict the theoretical predictions and experimental observations for usual phase separation systems. The growth kinetics significantly depend on the mixing ratio of DMSO and water showing that the solvent quality is also a factor affecting the phase separation kinetics during gelation. The unusual phase separation kinetics is discussed in terms of gelation-induced phase separation. 27 refs.

Japan Atomic Energy Agency; Kyoto UniversityJAPAN

Accession no. 1009316

Item 67E-PolymersNo.141, 2007, p.1SYNTHESIS AND CHARACTERIZATION OF POLY(VINYL ALCOHOL)-BORIC ACID BEADS FROM PVA WITH SEVERAL HYDROLYSIS

References and Abstracts

DEGREESDe Melo A; Borges D L G; Debacher N A; Curtius A J

PVAl-boric acid beads were prepared by the dropwise addition of PVAl aqueous solutions to a boric acid solution under constant stirring and controlled temperature. Different temperatures for bead formation as well as PVAl with different degrees of hydrolysis were used and tested. PVAl with several degrees of hydrolysis were characterised with respect to molecular mass and intrinsic viscosity while characterisation of PVAl-boric acid beads was carried out using TGA and SEM. The results obtained with TGA showed that structural changes occurred in PVAl following the reaction with boric acid and that the spheres formed were thermally stable whereas SEM analysis demonstrated that symmetric sphere-like beads were formed with significant porosity which were suitable for use as solid supports in effluent treatment. Trace element extraction tests were carried out using inductively-coupled plasma mass spectrometry. Without the addition of a chelating agent no significant extraction occurred from acidic solutions while after the addition of ethylene diamine tetraacetate less than 10% of the trace element content was extracted from the aqueous phase by the PVAl-boric acid beads. After the addition of ammonium OO-diethyldithiophosphate however over 10% of As Co Cr Fe Sr and Zn and 40% of Cd and 70% of Pb were extracted from acidic solutions even without any further optimisation. The results showed that the PVAl-boric acid beads synthesised were potential alternatives for trace element extraction in effluent treatment. 18 refs.

Santa Catarina Federal UniversityBRAZIL

Accession no. 1009211

Item 68Macromolecules40, No.22, 2007, p.8277STRUCTURE MODEL OF A POLY(VINYL ALCOHOL) FILM UNIAXIALLY STRETCHED IN WATER AND THE ROLE OF CRYSTALLITES ON THE STRESS-STRAIN RELATIONSHIPMiyazaki T; Hoshiko A; Akasaka M; Sakai M; Takeda Y; Sakurai S

A structure model of a poly(vinyl alcohol) (PVA) film during uniaxial stretching in water is proposed. It contains the strain-induced crystallisation in the interfibrillar extended amorphous regions formed with increasing the strain. It is found that the lamellar stacks in the film contribute to the system hardening which is attributed to the extension of the interfibrillar amorphous regions as precursors of the microfibrils formed with increasing the strain. As a result the system hardening induces the effective molecular chain extension. This may contribute to a high degree of orientation of PVA-iodine complexes when the PVA film is stretched in a KI/I2 aqueous solution. 34 refs.

Nitto Denko Corp.; Kyoto Institute of TechnologyJAPAN

Accession no. 1007588

Item 69Iranian Polymer Journal16, No.7, 2007, p.439INVESTIGATION OF REACTION CONDITIONS FOR PREPARATION OF MEDIUM MOLECULAR WEIGHT POLY(VINYL ALCOHOL) AS EMULSIFIERSoltani S; Asempour H; Jamshidi H

The synthesis of poly(vinyl alcohol) of medium molecular weight by free radical polymerisation of vinyl acetate using 22'-azobisisobutyronitrile as initiator followed by saponification of the resulting poly(vinyl acetate) is described. The products were characterised by molecular weight (intrinsic viscosity) degree of hydrolysis (titration) pH and viscosity of aqueous solutions degree of branching (proton NMR) and FTIR and the effects of different polymerisation and saponification reaction conditions on the products are discussed in terms of emulsifier applications. 23 refs.

Iran Polymer & Petrochemical Institute; Amirkabir University of TechnologyIRAN

Accession no. 1006728

Item 70Composites28, No.5, 2007, p.674OPTIMIZATION OF WATER ABSORPTION OF STARCH/PVA COMPOSITESZou G; Qu J; Zou X

The thermoplastic starch/PVA (SP) composites are prepared by a single-screw extruder. This article presents a study of the influence of the formulation on the hydrophilicity of SP composites. An orthogonal array and the analysis of variance (ANOVA) are employed. The results of ANOVA show that the water absorption (WA) of the SP composites with increasing amount of starch but glycerol and citric acid (CA) are useful in decreasing the WA of the SP composites. Some interactions are come into being between the factors and the most important one is the interaction between WCA and WB. From the results of experiment increasing the amount of CA and borax can improve the mechanical properties of SP composites and decrease the water absorption of SP composites by crosslinking starch and PVA which was confirmed by thermal analysis. 24 refs.

South China University of TechnologyCHINA

Accession no. 1004750

References and Abstracts

Item 71European Polymer Journal43, No.9, 2007, p.3933CRYSTALLIZATION KINETICS OF PHB/PVAC BLENDS USING TIME RESOLVED DIELECTRIC SPECTROSCOPYMadbouly S A; Mansour A A; Abdou N Y

Crystallisation kinetics of poly(hydroxy butyrate) PHB and its blends with poly(vinyl acetate) PVAc have been thoroughly investigated using broadband dielectric technique over a wide range of frequencies (10-2-105Hz) as functions of crystallisation temperature and blend composition. The dielectric strength of the amorphous segments DELTAepsilon which is directly proportional to the volume fraction of the mobile amorphous phase in the blend decreases exponentially with increasing the crystallisation time. However on the other hand the dielectric strength of the rigid amorphous segments DELTAepsilonalpha' which is related to the percentage of crystallinity in the blend increases dramatically with increasing crystallisation time. A great variation in the dynamical constraints of relaxation segments with increasing crystallisation time has been observed as a result of different environments which would lead to a variation in the consistency of the cooperative regions. The value of the dielectric constant epsilon' decreases dramatically with increasing crystallisation time after that it reaches an equilibrium value at the end of the crystallisation process. This dramatic decrease in the value of epsilon' as a result of crystallisation at a given crystallisation temperature is taken as an accurate evaluation for the amount of the amorphous phase that has undergone crystallisation considering the theoretical approach of Avrami. The Avrami exponent n is found to be crystallisation temperature Tc independent (n~3) indicating a three-dimensional crystal growth for pure PHB. The crystallisation rate constant k increases greatly with increasing Tc due to the high crystallisation rate. In the blend the value of n is found to be concentration dependent (n~1.8-3.2). The different values of n indicate that the shapes of the growing crystals are affected by blend concentration. For n~1.8 the crystals can either grow sporadically as rods or instantaneously as disks while for n~3 a three-dimensional crystal growth takes place.58 refs.

Cairo UniversityEGYPT

Accession no. 1004524

Item 72Polymer Preprints. Papers are presented at the ACS meeting held Washington, DC, August2005, 46, No.2, p.389REVERSIBLE ADDITION-FRAGMENTATION CHAIN TRANSFER (RAFT) POLYMERIZATION OF VNYL ACETATE USING XANTHATESShipp D A; Vercoe K; Tianxi Zhang; Thopasridharan M

RAFT polymerisation of vinyl acetate using two xanthates is investigated. Kinetic data show that the appropriate choice of RAFT agent can significantly improve the control of molecular weight growth and reduce induction times. PVA with Mn greater than 40000 and Mw/Mn less than 1.5 are produced. 5 refs.

Clarkson UniversityUSA

Accession no. 1004419

Item 73Polymer Preprints.Papers are presented at the ACS meeting held Washington, DC, August2005, 46, No.2, p.387RECENT ADVANCES IN THE MADIX PROCESSDestarac M; Zducha W; Zard S Z

Recent developments in the macromolecular design via the interchange of xanthates (MADIX) process are discussed. The removal of the xanthate terminal group the use of a fluorinated xanthate in ab initio emulsion polymerisation and the synthesis of hybrid block copolymers are highlighted. Results confirm the versatility of the MADIX process in producing a broad range of polymers with controlled architectures in hom*ogeneous and dispersed media. 19 refs.

Rhodia Technical and Research Centre; Palaiseau Ecole PolytechniqueEUROPEAN COMMUNITY; EUROPEAN UNION; FRANCE; WESTERN EUROPE

Accession no. 1004418

Item 74Polymer Preprints.Papers presented at the ACS meeting held Washington, DC, August2005, 46, No.2, p.313A NEW SYSTEM FOR THE CONTROLLED RADICAL POLYMERIZATION OF VINYL ACETATEDebuigne A; Detrembleur C; Bryaskova R; Caille J-R; Jerome R

An efficient technique for controlling radical polymerisation of vinyl acetate (VAc) in bulk suspension or miniemulsion polymerisation systems to obtain high monomer conversions and very high molecular weights was reported. The method could be extended to the grafting of PVAc onto fullerenes or carbon nanotubes and involved cobalt mediated radical polymerisation. Polymers were characterised using nuclear magnetic resonance spectroscopy and size exclusion chromatography. 21 refs.

Liege University; Solvay Research & TechnologyBELGIUM; EU; EUROPEAN COMMUNITY; EUROPEAN ECONOMIC COMMUNITY; EUROPEAN UNION; WESTERN EUROPE; WESTERN EUROPE-GENERAL

Accession no. 1003862

References and Abstracts

Item 75Polymer Preprints.Papers presented at the ACS meeting held Washington, DC, August2005, 46, No.2, p.225 THE EFFECT OF LIGAND AND COMONOMER ON COBALT MEDIATED RADICAL POLYMERIZATION OF VINYL ACETATEKaneyoshi H; Matyjaszewski K

The effect of the electron withdrawing group on a cobalt complex in cobalt mediated radical polymerisation of vinyl acetate compared to the effects of alternative trifluoro-cobalt complexes was studied using nuclear magnetic resonance spectroscopy gas chromatography and gel permeation chromatography. Similar studies were made on the polymerisation of butyl acrylate. It was shown that the addition of vinyl acetate to the butyl acrylate polymerisation system facilitates the reaction with the cobalt complex which otherwise would not take place. Coupling between the vinyl acetate radical and the cobalt complex was the critical step in the preparation of the dormant species in the reactions and allowed better control of the reaction. 8 refs.

Carnegie-Mellon UniversityUSA

Accession no. 1003832

Item 76Express Polymer Letters1, No.9, 2007, p.604SYNTHESIS OF GOLD NANO-PLATES BY MERCAPTIDE THERMOLYSIS IN POLY(VINYL ACETATE)Cardone G; Carotenuto G; Longo A; Perlo P; Ambrosio L

The synthesis of polymer-embedded triangular gold nanocrystals by thermal decomposition of gold(I) dodecylmercaptide dissolved in poly(vinyl acetate) and their characterisation by TEM AFM XRD and UV-visible spectroscopy is described. The effects on nanocrystal shape of selective absorption of the polymer side-groups on the faces of the growing gold nanocrystals are discussed. 8 refs.

Napoli Universita Federico II; Naples Institute of Composite & Biomedical Materials; Fiat Research CenterEUROPEAN COMMUNITY; EUROPEAN UNION; ITALY; WESTERN EUROPE

Accession no. 1003608

Item 77Polymer Engineering and Science47, No.9, 2007, p.1373CONTROLLED DRUG RELEASE THROUGH CARBOXYMETHYL-CHITOSAN/POLY(VINYL ALCOHOL) BLEND FILMSWang L; Chen X; Yu L; Li P

Carboxymethyl-chitosan (CMCS)/poly(vinyl alcohol) (PVA) blend film was studied for an application as a coating material in the site-specific drug delivery system. Films were prepared by blending varying amounts of 4 wt% CMCS with 4 wt% PVA casting and drying at 50 degree C for 24 h. The cross-sectional SEM micrograph of the film revealed that an increase in the amount of CMCS in the blend resulted in the film surface less smooth in the dry state and the network less uniform and more porous in the hydrated state which became appreciable at 50%. The inclusion of CMCS in the blend also made the swelling of the films pH-dependent and lead to an increase in the degree of swelling with pH increase. When the permeation of three model drugs salicylic acid theophyline and ornidazole was studied using a static diffusion vessel it followed a zero-order kinetics and increased with an increase in the CMCS content in the blend a decrease in the molecular weight of drug an increase in the pH of medium and a decrease in the film thickness. 33 refs.

Qingdao Ocean UniversityCHINA

Accession no. 1003549

Item 78Journal of Applied Polymer Science106, No.1, 2007, p.60FORMATION OF THE FIRST INJECTABLE POLYVINYL ALCOHOL HYDROGEL BY MIXING OF FUNCTIONAL PVA PRECURSORSOssipov D A; Brannvall K; Forsberg-Nilsson K; Hilborn J

Details are given of the preparation of crosslinkable PVAL hydrogel by mixing aqueous solutions of two PVAL components derivatised with hydrazide and aldehyde pendant groups. Hydrogel formation was based on the chemoselective crosslinking reaction. In vitro cytocompatibility was assessed using murine neuroblastoma N2a cells. 29 refs.

Uppsala UniversityEUROPEAN UNION; SCANDINAVIA; SWEDEN; WESTERN EUROPE

Accession no. 1002878

Item 79Composites Part A38, No.9, 2007, p.2041MORPHOLOGICAL AND MECHANICAL PROPERTIES OF BILE SALT MODIFIED MULTI-WALLED CARBON NANOTUBE/POLY(VINYL ALCOHOL) NANOCOMPOSITESMi Y; Zhang X; Zhou S; Cheng J; Liu F; Zhu H; Dong X; Jiao Z

Non-covalently functionalised carbon nanotubes are more attractive for multifunction composites because they preserve nearly all the nanotubes' intrinsic properties and enhance the electroconductivity of polymer composites. However It is seldom reported that they make dramatic

References and Abstracts

improvement in mechanical properties. In this paper we have successfully prepared a poly(vinyl alcohol) (PVA) nanocomposite with a non-covalently functionalised carbon nanotube (DOC-MWNTs) using a simple method which achieve a significant enhancement in mechanical properties. The tensile modulus and tensile yield strength of the PVA composite film containing 5wt% DOC-MWNTs increased by 140% and 65% respectively comparing to the pure PVA film. FT-IR TEM SEM and DSC were used to investigate the MWNTs and PVA/MWNTs nanocomposites. The results show that the separately dispersed DOC-MWNTs filler throughout the PVA matrix and the strong adhesion between the DOC-MWNTs filler and the PVA matrix are responsible for the significant reinforcement of the mechanical properties of the composite prepared. 42 refs.

Zhejiang University; Fuzhou UniversityCHINA

Accession no. 1002445

Item 80Polymer Bulletin59, No.2, 2007, p.289PERVAPORATION PERFORMANCE AND TRANSPORT PHENOMENON OF PVA BLEND MEMBRANES FOR THE SEPARATION OF THF/WATER AZEOTROPIC MIXTURESRao P S; Sridhar S; Ming Yen Wey; Krishnaiah A

Dense polymer membranes were prepared by mixing aqueous solutions of hydrophilic PVAl and polyethylenimine in different ratios and the effect of blend ratio on the separation performance of the blends investigated. Diffusion swelling sorption and permeability coefficients of the membranes in the presence of THF and water were determined by sorption measurements at 30 degrees C. Polyvinyl alcohol/polyethylenimine blends with a blend ratio of 5:1 possessed the highest separation factor and a flux of 1.28 kg/sq.m.h for THF. 30 refs.

Taiwan National Chung-Hsing University; Indian Institute of Chemical Technology; Sri Venkateswara UniversityINDIA; TAIWAN

Accession no. 1001876

Item 81JEC CompositesNo.34, 2007, p.36THICKENER ADDITION AND THE MORPHOLOGY OF UPE/PVAC BLENDSMontagne M; Bulliard X; Michaud V; Manson J-A E

The effects of the addition of thermoplastics such as acid-modified poly(vinyl acetate) as low profile additives and thickeners such as magnesium oxide on the morphology and shrinkage on curing of unsaturated polyester resins derived from maleic anhydride and propylene glycol were investigated. The results are discussed in terms of

phase separation before or during curing and dimensional stability of the resins.

Prangins; Lausanne Ecole Polytechnique FederaleSWITZERLAND; WESTERN EUROPE

Accession no. 1001674

Item 82Polymer PreprintsPapers are presented at the ACS meeting held Chicago I1, 25th-30th March2007, 48, No.1, p.907NANOSTRUCTURING POLYMERS WITH CYCLODEXTRINSRusa M; Uyar T; Rusa C; Tonelli A E

The effects on the conformations morphologies and thermal characteristics of polyethylene terephthalate samples produced by coalescence from their gamma-cyclodextrin-inclusion complex crystals are described. The formation of inclusion compounds between block copolymers and cyclodextrins is shown to enhance phase segregation of blocks. Potential synthetic routes to polymer-cyclodextrin inclusion compounds and their brushes ordered three-dimensionally on surfaces are also proposed. The formation of these materials on surfaces may permit fabrication of new nanoscopic devices and should provide a means to assessing mechanical electrical and optical properties of ordered and highly extended polymer chains that are free of interchain coupling. 10 refs.

North Carolina State UniversityUSA

Accession no. 1001443

Item 83European Polymer Journal43, No.8, 2007, p.3277BIREFRINGENCE CONTROL FOR BINARY BLENDS OF CELLULOSE ACETATE PROPIONATE AND POLY(VINYL ACETATE)Yamaguchi M; Masuzawa K

Structure and optical properties for binary blends composed of biomass-based cellulose acetate propionate (CAP) and poly(vinyl acetate) (PVAc) have been studied. It is found that the blends exhibit high level of transparency although the dynamic mechanical analysis in the solid state suggests that phase separation occurs in the blend. Furthermore the birefringence resulting from molecular orientation decreases with increasing the content of PVAc. In particular the blend with approximately 50 wt% of PVAc exhibits no birefringence even after stretching. 21 refs.

Japan Advanced Institute of Science & TechnologyJAPAN

Accession no. 1001388

Item 84Polymer Degradation and Stability

References and Abstracts

92, No.8, 2007, p.1555A NOVEL INTUMESCENT FLAME-RETARDANT SYSTEM CONTAINING METAL CHELATES FOR POLYVINYL ALCOHOLDe-Long Wang; Ya Liu; De-Yi Wang; Chun-Xia Zhao; Yu-Rong Mou; Yu-Zhong Wang

A novel flame retardant containing phosphorous-nitrogen structure the ammonium salt of 2-hydroxyl-55-dimethyl-22-oxo-132-dioxapho sphorinane (PNOH) was synthesised and its structure was characterized by 1H NMR and FTIR spectra. PNOH was used together with ammonium polyphosphate (APP) to prepare a novel intumescent flame retardant (IFR) for polyvinyl alcohol (PVA). When a few amounts (0.5%) of metal chelates were added the flame retardancy of the IFR-PVA systems was significantly improved having a high LOI value of 34.2 in a total IFR loading of 15 wt%. In order to have an understanding of the resulting flame retardant effects the thermal degradation behaviours of IFR-PVA systems were investigated by thermogravimetric analysis (TGA) and the morphology and structures of residues generated in different conditions were investigated by scanning electronic microscopy (SEM) and FTIR spectra. The results show that NiSAO can promote the thermal stability of the IFR-PVA; the residual char containing polyphosphoric or phosphoric acid is formed during the combustion; the formation of a continuous and dense char layer could inhibit the transmission of heat during contacting with flame and shows good flame retardancy. 32 refs.

Sichuan UniversityCHINA

Accession no. 1001332

Item 85Polymer PreprintsPapers are presented at the ACS meeting held Chicago I1, 25th-30th March 2007, 48, No.1, p.571DEGRADATION MECHANISM AND KINETIC MODELING OF INTUMESCENT FLAME RETARDED POLY(VINYL ACETATE)Bart R; Rahier H; Assche G V; Van Mele B

The degradation mechanism and decomposition kinetics of poly(vinyl acetate) (PVAc) and flame-retarded composites of EVA and ammonium polyphosphate (APP) were examined in various atmospheres by thermogravimetry and by solid-state NMR analysis of the degradation products. A kinetic model was developed for the degradation of PVAc-APP composites. The stability of the composites is increased by mixing of APP into the PVAc matrix. The optimal mixing ratio for crosslinking of PVAc-APP composites while retaining maximum stability is 100: 20. 7 refs.

Brussels Vrije Universiteit

BELGIUM; EU; EUROPEAN COMMUNITY; EUROPEAN ECONOMIC COMMUNITY; EUROPEAN UNION; WESTERN EUROPE; WESTERN EUROPE-GENERAL

Accession no. 1000551

Item 86Reactive and Functional Polymers67, No.8, 2007, p.708SYNTHESIS AND CHARACTERIZATION OF HYBRID POLYMERIC NETWORKS (HPN) BASED ON POLYVINYL ALCOHOL/CHITOSANRodrigues I R; De Camargo Forte M M; Azambuja D S; Castagno K R L

The aims of this study are the preparation of hybrid polymer network (HPN) hydrogels with slight differences in their hydrophilic balance and evaluate the influence of the chemical composition on the HPN for application as solid polymeric electrolytes (SPEs). A hydrogels series of polyvinyl alcohol (PVA)/chitosan (CHI) were prepared using glutaraldehyde as crosslinking agent. The hydrogels were characterized by Fourier transformed infrared spectroscopy (FTIR) differential scanning calorimetry (DSC) swelling ratio (SR) and electrochemical impedance spectroscopy (EIS). For sample with higher chitosan in the HPN the PVA crystallisation was decreased and HPN with higher PVA content presented an increased swelling ratio. The electrochemical impedance studies demonstrated that the ionic conductivity of PVA/CHI HPN films depend on their composition and it is higher as the PVA content in hydrogel was diminished. 21 refs.

Rio Grande do Sul Universidade FederalBRAZIL

Accession no. 1000405

Item 87Polymers for Advanced Technologies18, No.7, 2007, p.535POLY(VINYL ALCOHOL) (PVA)/SULFONATED POLYHEDRAL OLIGOSILSESQUIOXANE (SPOSS) HYBRID MEMBRANES FOR DIRECT METHANOL FUEL CELL APPLICATIONSYoung-Wook Chang; Erdong Wang; Geumsig Shin; Jung-Eun Han; Mather P T

Organic/inorganic hybrid membranes based on polyvinyl alcohol and sulphonated polyhedral oligosilsesquioxane crosslinked by ethylenediaminetetraacetic dianhydride are prepared. Proton conductivity increases and methanol permeability decreases with increasing silsesquioxane content. A conductivity of 0.042 S/cm is achieved. It is proposed that the polar sulphonic acid groups of the silsesquioxane cages assemble to provide ion conduction pathways while the hydrophobic portions combine to form a barrier to methanol permeation with improved thermal stability. These materials are possible candidates for direct methanol fuel cell applications. 24 refs.

References and Abstracts

Hanyang University; Case Western Reserve UniversityKOREA; USA

Accession no. 999640

Item 88Polymers and Polymer Composites15, No.5, 2007, p.371MORPHOLOGY AND VISCOELASTIC PROPERTIES OF POLY(VINYL CHLORIDE)/POLY(VINYL ALCOHOL) INCOMPATIBLE BLENDSTakeuchi K; Kamaguchi A; Nabeta M; Fujii S; Nakamura Y; Iida T

PVC/polyvinyl alcohol incompatible blends were investigated with respect to the pre-mixing method used and the degree of saponification of polyvinyl alcohol on the morphology and viscoelastic properties of the blend. A powder method and an aqueous solution mixing method were both used as methods of controlling the domain size in the incompatible blend by relaxing the strong intramolecular hydrogen boding of PVA and enhancing intermolecular interaction. The effect of the pre-mixing method on the domain size in the PVC/PVA blend was investigated using PVA with different levels of saponification and polymerisation. Furthermore the effect on the domain size by adding PMMA which has good compatibility with PVC as a third component was investigated. The interaction between the blend components was determined by measuring the viscoelastic properties. 18 refs.

Osaka Institute of Technology.JAPAN

Accession no. 999526

Item 89Plastics Science and Technology35, No.6, 2007, p.56THE EFFECT OF HEAT TREATMENT ON THE PROPERTIES OF PVA FILMLiu Zhongke; Yoong Kuigang

Polyvinyl alcohol was heat treated and the effect of heat treatment on the mechanical properties surface resistivity optical properties and electrical properties investigated. 3 refs.

Dalian Plastics Research Institute Co.Ltd.CHINA

Accession no. 999190

Item 90Polymer48, No.14, 2007, p.4068THERMO-ELECTRICAL PROPERTIES OF PVA-NANOTUBE COMPOSITE FIBERSMiaudet P; Bartholome C; Derre A; Maugey M; Sigaud G; Zakri C; Poulin P

We present in this work an experimental study of the resistivity of composite nanotube fibres made of polyvinyl alcohol and multiwalled carbon nanotubes. These fibres which exhibit exceptional mechanical properties could be used for new conductive and multifunctional textiles or composites. We report on their electrical properties and draw two main conclusions: (i) when the fibres contain a large fraction of amorphous polymer a substantial decrease of the resistivity is observed in the vicinity of the glass transition temperature (Tg) of the pure PVA. On the basis of X-ray diffraction characterisations we believe that this behaviour results from the relaxation of stress in the polymer-nanotube composite. Slight structural modifications and partial loss of nanotube alignment at Tg could yield an increase of the density of intertube contacts and thereby to a decrease of the electrical resistivity. (ii) Annealing the fibres at high temperature reduces the fraction of amorphous PVA which becomes more crystalline. As a result the conductivity becomes more stable and does not exhibit any abrupt variation at Tg. Instead the conductivity is non-metallic with an effective semi-conductor type behaviour as observed in other nanotube composites or even in pure nanotube assemblies. 25 refs. Copyright (c)

Bordeaux 1 UniversiteEUROPEAN COMMUNITY; EUROPEAN UNION; FRANCE; WESTERN EUROPE

Accession no. 999109

Item 91Journal of Colloid and Interface Science312, No.2, 2007, p.201RELAXATION PHENOMENA IN POLY(VINYL ALCOHOL)/FUMED SILICA AFFECTED BY INTERFACIAL WATERGun'ko V M; Pissis P; Spanoudaki A; Zarko V I; Nychiporuk Y M; Andriyko L S; Goncharuk E V; Leboda R; Skubiszewska-Zieba J; Osovskii V D; Ptushinskii Y G

Interaction of poly(vinyl alcohol) (PVA) with fumed silica was investigated in the gas phase and aqueous media using adsorption broadband dielectric relaxation spectroscopy (DRS) thermally stimulated depolarisation current (TSDC) infrared spectroscopy thermal analysis and one-pass temperature-programmed desorption (OPTPD) mass-spectrometry (MS) methods. PVA monolayer formation leads to certain textural changes in the system (after suspension and drying) because of strong hydrogen bonding of the polymer molecules to silica nanoparticles preventing strong interaction between silica particles themselves. This strong interaction promotes associative desorption of water molecules at lower temperatures than in the case of silica alone. Interaction of PVA with silica and residual water leads to depression of glass transition temperature (Tg). There are three types of dipolar relaxations at temperatures lower and higher than the Tg value. A small amount of

References and Abstracts

adsorbed water leads to significant conductivity with elevating temperature. 66 refs.

Ukraine Institute of Surface Chemistry; Athens National Technical University; Lublin Maria Curie-Sklodowska University; Ukraine Institute of PhysicsEASTERN EUROPE; EUROPEAN COMMUNITY; EUROPEAN UNION; GREECE; POLAND; UKRAINE; WESTERN EUROPE

Accession no. 999066

Item 92Polymer Composites28, No.3, 2007, p.365ELASTIC RESPONSE OF NANOCOMPOSITE POLY(VINYLACETATE)-HYDROXYAPATITE WITH VARYING PARTICLE SHAPEKalfus J; Jancar J

The mechanisms by which hydroxyapatite nanofiller promotes reinforcement in poly(vinylacetate) matrix is investigated. Hydroxyapatite nanofillers with spherical and platelet particle shape were synthesised. Particle size was in the range from 5 to 60 nm. Filler concentration in composites was limited to maximum of 5 vol% to minimize filler networking. Effect of the nanofiller particle shape on the elastic response of nanocomposite was examined using dynamic-mechanical thermal spectroscopy. Attempt to interpret the observed phenomena was based on the molecular approach. 26 refs.

Brno University of TechnologyCZECH REPUBLIC

Accession no. 998976

Item 93European Polymer Journal43, No.7, 2007, p.2809BICOMPONENT ALIGNED NANOFIBERS OF N-CARBOXYETHYLCHITOSAN AND POLY(VINYL ALCOHOL)Mincheva R; Manolova N; Rashkov I

Bicomponent nanofibres of N-carboxyethylchitosan (CECh) and poly(vinyl alcohol) (PVA) were obtained by electrospinning of mixed aqueous solutions. The electrospinning of CECh-containing nanofibres was enabled by the ability of PVA to form an elastically deformable entanglement network based on hydrogen bonds. The average diameters of the bicomponent fibres were in the range 100-420nm. Water-resistant nanofibrous mats were obtained by thermal crosslinking at 100 deg.C for 10h. Nanofibrous materials with 1D- 1D-transversery or 3D fibre alignment were obtained depending on the type of the collector used. 29 refs.

Sofia Institute of PolymersBULGARIA; EASTERN EUROPE

Accession no. 998790

Item 94Proceedings of the 65th SPE Annual conference (ANTEC) held Cincinnati OH6th-11th May, 2007, p.2647PHYSICS OF AMORPHOUS POLYMERSMcKenna G B

Amorphous polymers are of continuing great fundamental and practical interest. From the melt state through the glass transition these materials exhibit highly nonlinear properties that are readily interrogated using methods of both linear and nonlinear rheology and mechanics. In this paper several novel methods are examined which have been developed by the author to investigate swelling in rubber nonlinear behaviour of polymer glasses and the behaviour of materials at the nanoscale 23 refs.

Lubbock Texas Tech University; Ecole Superieure de Physique and Chimie Industrielles de la Ville de ParisEUROPEAN COMMUNITY; EUROPEAN UNION; FRANCE; USA; WESTERN EUROPE

Accession no. 998492

Item 95International Journal of Polymeric Materials56, No.4-6, 2007, p.579STRUCTURAL ELECTRICAL AND OPTICAL CHARACTERIZATION OF PURE AND DOPED POLY(VINYL ALCOHOL)(PVA) POLYMER ELECTROLYTE FILMSBhargav P B; Mohan V M; Sharma A K; Rao V V R N

A sodium ion conducting polymer electrolyte based on PVAl complexed with sodium iodide was prepared using the solution casting technique. The structural properties of composite PVAl polymer electrolyte films were examined by X-ray diffraction(XRD). The XRD results revealed that the amorphous domains of PVAl polymer matrix increased in size with the increase of NaI salt concentration. The variation in film morphology was examined by SEM. FTIR spectra studies for pure PVAl and complexed films revealed the vibrational changes that occurred due to the effect of dopant salt in the polymer. DC conductivity was measured in the temperature range of 303-373 deg K and the conductivity was found to increase with the increase of dopant concentration as well as temperature. Optical absorption studies were made in the wavelength range 200-600 nm. The absorption edge direct band gap and indirect band gap values were evaluated. 26 refs.

Sri Venkateswara UniversityINDIA

Accession no. 998323

Item 96Polymer Bulletin58, No.5-6, 2007, p.913MECHANICAL PROPERTIES BIODEGRADATION AND WATER VAPOUR PERMEABILITY OF BLEND FILMS OF

References and Abstracts

SOY PROTEIN ISOLATE AND POLY(VINYL ALCOHOL) COMPATIBILIZED BY GLYCEROLJun-Feng Su; Zhen Huang; Kai Liu; Ling-Ling Fu; Hong-Ru Liu

Blend films of soy protein isolate (SPI) and poly(vinyl alcohol) (PVA) compatibilised by glycerol were prepared by casting from solution and their mechanical biodegradation and water-vapour permeability products were examined. The blended film degraded more slowly than pure SPI. The stress at yield point stress at break point and Young's modulus of the SPI/PVA blend were decreased and the percentage elongation at the yield point and at the break point were increased compared with the corresponding values for SPI. The water vapour permeability of SPI/PVA/glycerol showed a minimum at an SPI/PVA ratio of 100:35 compatibilised with 3.5% of glycerol. 37 refs.

Tianjin University of CommerceCHINA

Accession no. 997866

Item 97Proceedings of the 65th SPE Annual conference (ANTEC) held Cincinnati OH2007, p.184ADHESION PROMOTION USING FLAME PLASMA SURFACE TREATMENTDiGiacomo J Flynn

The converting industry uses a significant amount of polyolefins from polyethylene coated paper board to metallised paper & film as well as polyolefin thin films. Plastics are composed of non-polar long chain molecules with low surface energy. They are inert molecules. Unlike materials with high surface energies like metals and ceramics virgin plastics do not contain the available bond sites provided by charged ions distributed over the surface. These provide for Van der Waals bonding forces. Without this molecular attraction (Van der Waals forces) liquids fail to ôwet out or adhere to the surface resulting in poor adhesion of an ink coating adhesive or lamination. As long as solvent based coatings inks and adhesives were used in converting processes surface modification or surface treatment was not usually required or if it was the level of treatment was relatively low. As a general rule acceptable adhesion is achieved if the surface energy of the substrate that is the ability to attract a liquid is 10 dynes/cm higher than the surface tension i.e. the resistance to spreading of the coating ink etc. of the liquid. In this situation the liquid is said to ôwet outö or adhere to the surface. Surface tension is a measurement of surface energy a property of liquids due to molecular forces by which all liquids through contraction of the surface tend to bring the contained volume into a shape having the minimal area. A liquid placed on a flat horizontal surface will either lay flat on the surface called ôwetting outö or form a spherical drop know as ôdewettingö An in-between state can also exist. The nomenclature is surface tension for solids it is surface energy for solids. The units are force/unit length

or dynes/cm. The angle that the droplet or edge of the liquid makes with the solid is called the contact angle. Contact angles are both advancing (forward) and receding (backward). The lower the contact bangle the better the wettability. 2 refs.

Flynn Burner Corp.USA

Accession no. 997416

Item 98Proceedings of the 65th SPE Annual conference (ANTEC) held Cincinnati OH2007, p.138NANOMECHANICAL PROPERTIES OF ULTRATHIN POLYMERSXu S; O'Connell P A; McKenna G B

A novel micro-bubble inflation method to measure the viscoelastic properties of ultra-thin polymer films over a range of stresses and temperatures has been developed. The method is capable of measuring the biaxial creep compliance response of films as thin as 13 nm. Some prior experiments are summarised that show a dramatic stiffening of both poly(vinyl acetate) (PVAc) and polystyrene (PS) in the rubbery regime at the reduced thickness but a material specific degree of reduction in the glass transition temperature. In addition preliminary results of creep recovery experiments and thin film rupture images are shown that suggest that the method can be used for a broader range of mechanical measurements than originally anticipated. 10 refs.

Texas Technical UniversityUSA

Accession no. 997408

Item 99European Polymer Journal43, No.6, 2007, p.2171RADIOLYTIC SYNTHESIS AND CHARACTERIZATION OF AG-PVA NANOCOMPOSITESKrkljes A N; Marinovic-Cincovic M T; Kacarevic-Popovic Z M; Nedeljkovic J M

The Ag-PVA nanocomposites with different contents of inorganic phase were prepared by reduction of Ag+ ions in aqueous PVA solution by gamma irradiation followed by solvent evaporation. Optical properties of the colloidal solutions and the nanocomposite films were investigated using UV-vis spectroscopy. Structural characterisation of the Ag nanoparticles was performed by TEM and XRD. Interaction of the Ag nanoparticles with polymer matrix and the heat resistance of the nanocomposites were followed by IR spectroscopy and DSC analysis. IR spectra indicated that Ag nanofiller interact with PVA chain over OH groups. The changes of heat resistance upon the increase of the content of inorganic phase are correlated

References and Abstracts

to the adsorption of polymer chains on the surface of Ag nanoparticles. 28 refs.

Belgrade Institute of Nuclear SciencesSERBIA

Accession no. 996672

Item 100Polymer48, No.13, 2007, p.3850SOLID-STATE 13C NMR INVESTIGATION OF THE STRUCTURE AND HYDROGEN BONDING FOR STEREOREGULAR POLY(VINYL ALCOHOL) FILMS IN THE HYDRATED STATEOhgi H; Yang H; Sato T; Horii F

The structure and hydrogen bonding of the hydrated stereoregular poly(vinyl alcohol) (PVA) films have been investigated by high-resolution solid-state 13C NMR spectroscopy. It is found by the 13C spin-lattice relaxation analysis that there exist three components with different T1C values assigned to the crystalline less mobile and mobile components for the hydrated syndiotactic PVA (S-PVA) and highly isotactic PVA (HI-PVA) films. The line shape analysis indicates that the probability of intramolecular hydrogen bonding is appreciably increased in the crystalline region for the S-PVA films by the hydration but a slightly helical structure which is probably allowed by the formation of the successive intramolecular hydrogen bondings along the chains in the crystalline region seems not to undergo any significant change by the hydration for HI-PVA. This fact indicates that intramolecular hydrogen bonding is more stable in the hydrated state in the crystalline region. As for the less mobile component the line shape of the CH resonance line for the hydrated S-PVA or HI-PVA films is found to be very similar to that of the corresponding crystalline component probably being due to the successive formation of intermolecular or intramolecular hydrogen bonding in the interfacial region which mainly contributes to the less mobile component for the S-PVA or HI-PVA films even in the hydrated state. The mole fractions of the mm mr and rr sequences are also estimated for the mobile component that is produced in each stereoregular PVA sample by swelling with water and it is concluded that no prominent preferential partitioning of the mm mr and rr sequences occurs in the crystalline and noncrystalline regions for the PVA films with different tacticities. 30 refs.

Kuraray Co.Ltd.; Kyoto UniversityJAPAN

Accession no. 996664

Item 101Chemical Week169, No.20, 2007, p.41VAM

Global demand for vinyl acetate monomer (VAM) reached an all-time high of 4.8 million m.t. in 2006 but the addition

of nearly 700000 m.t/ of capacity in the last two years dragged down global operating rates to 83% according to SRI Consulting. Rising acetic acid and ethylene feedstock prices have prompted Dow Chemical to announce price increases which took effect May 24. The VAM market shifted from balanced to tight in recent weeks due to production problems in Europe and the US. Global VAM demand is expected to grow at 3.3-3.8%/year through 2011. Most applications are mature including major end uses such as polyvinyl acetates and polyvinyl alcohol. The fastest-growing application sector will be EVOH resins which are projected to grow by 6-7%/year for the next five years. This is unlikely to have a significant impact on VAM demand however because EVOH accounts for only minor quantities of VAM demand.

SRI ConsultingWORLD

Accession no. 996434

Item 102Polymer Degradation and Stability92, No.6, 2007, p.1061A THERMAL DEGRADATION MECHANISM OF POLYVINYL ALCOHOL/SILICA NANOCOMPOSITESZheng Peng; Ling Xue Kong

The thermal degradation mechanism of a novel polyvinyl alcohol/silica (PVA/SiO2) nanocomposite prepared with self-assembly and solution-compounding techniques is presented. Due to the presence of SiO2 nanoparticles the thermal degradation of the nanocomposite compared to that of pure PVA occurs at higher temperatures requires more reaction activation energy (E) and possesses higher reaction order (n). The PVA/SiO2 nanocomposite similar to the pure PVA thermally degrades as a two-step-degradation in the temperature ranges of 300-450 deg.C and 450-550 deg.C respectively. However the introduction of SiO2 nanoparticles leads to a remarkable change in the degradation mechanism. The degradation products identified by Fourier transform infrared/thermogravimetric analysis (FTIR/TGA) and pyrolysis-gas chromatography/mass spectrometric analysis (Py-GC/MS) suggests that the first degradation step of the nanocomposite mainly involves the elimination reactions of H2O and residual acetate groups as well as quite a few chain-scission reactions. The second degradation step is dominated by chain-scission reactions and cyclisation reactions and continual elimination of residual acetate groups is also found in this step. 31 refs. Copyright (c) 2007 Elsevier Ltd.

Chinese Academy of Tropical Agricultural Sciences; South Australia UniversityAUSTRALIA; CHINA

Accession no. 996422

References and Abstracts

Item 103Colloid and Polymer Science285, No.2, 2006, p.185INFLUENCE OF ADDITIVES ON MODEL EMULSION POLYMERIZATION OF VINYL ACETATE (VAC) USING POLY(VINYL ALCOHOL) (PVA) AS A PROTECTIVE COLLOIDSuzuki A; Yano M; Kikuchi K; Okaya T

The influence of low molec.wt. alcohols such as isopropyl alcohol and additives such as acetone acetic acid and acetonitrile on the mechanism of particle nucleation grafting of vinyl acetate onto PVAl during emulsion polymerisation of vinyl acetate in a 1% aqueous solution with ammonium persulphate and degree of polymerisation of the resulting polymers. The addition of alcohols strongly affected particle formation particularly grafting which was attributed to competition between hydrogen abstraction from PVAl and alcohol with a sulphate radical. Acetone addition gave rise to a decrease in grafting and increases in particle size and the number of polymer molecules in a polymer particle. 19 refs.

Shiga Prefecture UniversityJAPAN

Accession no. 996049

Item 104Materials Letters61, No.16, 2007, p.3542A NEW CRYSTAL MORPHOLOGY OF STRAIGHT-STALK DENDRITES IN BLENDS OF POLY(BUTYLENE ADIPATE) WITH AMORPHOUS POLY(VINYL ACETATE)Woo E M; Chao-Shun Chang; Ming Chien Wu

Discontinuity in crystallisation rates and a new and unusual morphology consisting of thickened straight-stalks crystal lamellae with also straight branches radiating out from a common nucleus were observed in blends of poly(vinyl acetate) (PVAc) with poly(14-butylene adipate) (PBA). The discontinuity in the crystal growth and mechanisms of straight-dendrite morphology of the PVAc/PBA blends were analyzed using polarized-light optical microscopy (POM) differential scanning calorimetry (DSC) and wide-angle X-ray diffraction (WAXD). The discontinuity in crystallisation rate and dendritic morphology occurred only at or near PVAc/PBA 10/90 blend composition upon crystallisation at high-temperature regimes of Tc=30-33 deg.C. By comparison when crystallised at the same temperatures PVAc/PBA blends of amorphous polymer loading greater than 15% or the neat PBA (amorphous polymer loading=0) developed no dendrites but only typical Maltese-cross spherulites. Mechanism of straight dendrites in the blends is preliminarily expounded. Detailed interpretation requires further analyses. 12 refs.

Taiwan National Cheng Kung UniversityTAIWAN

Accession no. 995869

Item 105Polymer48, No.10, 2007, p.2939NOVEL PVA-SILICA NANOCOMPOSITE MEMBRANE FOR PERVAPORATIVE DEHYDRATION OF ETHYLENE GLYCOL AQUEOUS SOLUTIONRuili Guo; Xiaocong Ma; Changlai Hu; Zhongyi Jiang

To effectively suppress the swelling of poly(vinyl alcohol) (PVA) membrane polymer-inorganic nanocomposite membranes composed of PVA and gamma-mercaptopropyltrimethoxysilane (MPTMS) were prepared by in situ sol-gel technique for pervaporative separation of water-ethylene glycol (EG) mixtures. Effects of the types of catalyst for sol-gel process and MPTMS content on the physical and chemical structure of PVA-silica nanocomposite membranes (designated as PVA-MPTMS hereafter) were investigated by 29Si NMR FTIR SEM XRD and TGA-DTA. Due to the formation of more compact crosslinked structure nanocomposite membranes exhibited enhanced thermal stability. It was found that when 50 wt% of MPTMS was incorporated into PVA the nanocomposite membranes possessed optimum pervaporation performance for 80 wt% EG aqueous solution at 70 deg.C. Unexpectedly there was no improvement in the pervaporation performance of PVA-MPTMS nanocomposite membranes after mercapto group was oxidised into sulphonic group. 24 refs. Copyright (c) 2007 Elsevier Ltd.

Tianjin UniversityCHINA

Accession no. 995484

Item 106Macromolecular SymposiaNo.249/250, 2007, p.456THE EFFECTS OF MWD ON THE RHEOLOGICAL PROPERTIES OF SHEAR-INDUCED STRUCTURAL FORMATION FOR PVA SOLUTIONS IN DMSOEun Jeoung Lee; Byoung Chul Kim

Polyvinyl alcohol solutions were prepared in dimethylsulphoxide and the effects of the molecular weight distribution of the polymer on the shear induced structure formation in the solution was studied using rheometric methods. Dyad content of the polymer was determined using nuclear magnetic resonance spectroscopy. Time dependence of rheological properties depended on molecular weight distribution (MWD) at a particular polymer molecular weight with dynamic viscosity lower for a broad MWD on the first rheometer sweep but higher on the second sweep. Results were explained by the formation of a gel structure through the solution that was affected by shear conditions and MWD. 22 refs.

References and Abstracts

Hanyang UniversityKOREA

Accession no. 995000

Item 107Materials Chemistry & Physics103, No.1, 2007, p.118POLY(VINYL ACETATE)-CLAY HYBRIDS PREPARED VIA EMULSION POLYMERIZATION ASSISTED BY A NONIONIC SURFACTANTCorobea M C; Uricanu V; Donescu D; Radovici C; Serban S; Garea S; Iovu H

Hybrid materials containing poly(vinyl acetate) and montmorillonite (MMT) were prepared using an one-batch emulsion polymerisation recipe assisted by a nonionic surfactant. To explain the results of our experiments a thorough investigation of the specific interactions between the compounds was done in the wet as well as the dried state of the end-products. In dispersion polymer-surfactant interactions were found to be driven by hydrophobic coupling into superficial (mixt) admicelles. Another important finding is that the amount of clay used in the recipes and its relative concentration with respect to the other reaction partners influences drastically the morphological units in the end-products. For low [MMT] well-defined spherical particles are formed. At the other extreme for high [MMT] production of polymeric water-swollen aggregates is favoured. A small amount of reformed MMT tactoids was detected in all casted hybrid films indicating that most of the inorganic is dispersed in the organic phase. 86 refs.

Bucharest Chemical Research Institute; Twente University; Bucharest Polytechnical UniversityEASTERN EUROPE; EUROPEAN COMMUNITY; EUROPEAN UNION; NETHERLANDS; RUMANIA; WESTERN EUROPE

Accession no. 994395

Item 108European Polymer Journal43, No.5, 2007, p.2035MORPHOLOGY ASSESSMENT OF CHEMICALLY MODIFIED CRYOSTRUCTURED POLY(VINYL ALCOHOL) HYDROGELEl Fray M; Pilaszkiewicz A; Swieszkowski W; Kurzydlowski K J

The morphology of hydrogels based on poly(vinyl alcohol) (PVA) in their frozen hydrated state modified with biologically active di- and multifunctional molecules was studied by scanning electron microscopy (SEM) with cryo-attachment. The porosity of samples was found to be more regular and ordered in the case of samples containing difunctional and especially multifunctional carboxylic acids as compared to the neat PVA hydrogel. The morphology is dependent not only from the hydrogel composition but also the number of freezing-thawing cycles. Resulted highly porous and oriented structure

has significant influence on materials properties such as compressive stress and crosslinking density. 16 refs.

Szczecin University of Technology; Warsaw UniversityEASTERN EUROPE; POLAND

Accession no. 993627

Item 109Polymer Preprints2006, 49, No.2, p.926ROLE OF THE DEGREE OF HYDROLYSIS AND BLOCKINESS OF POLY(VINYL ALCOHOL) (PVA) IN THE INITIAL STAGE OF EMULSION POLYMERIZATION OF METHYL METHACRYLATE (MMA) USING PVA AS A PROTECTIVE COLLOIDSuzuki A; Nakajima A; Kikuchi K; Okaya T Shiga

The influence of the degree of hydrolysis and blockiness of polyvinyl alcohol on model experiments of emulsion polymerisation of methyl methacrylate in a 1% aqueous solution is studied. The main reaction is hydrogen abstraction from PVA yielding the particle nucleation by grafting. The grafted chains form particles by coagulation. A low degree of hydrolysis leads to the new particle nucleation with an increase in grafting. A high degree of hydrolysis strongly affects the mechanism of particle growth with a decrease in grafting. 10 refs.

Prefecture UniversityJAPAN

ACCESSION NO. 993234

Item 110Polymer Preprints2006, 47, No.2, p.922PREPARATION OF ANTIMICROBIAL POLY(VINYL ALCOHOL) NANOFIBERS CONTAINING SILVER NANOPARTICLESWen-Ji Jin; Jeong Jeon; Eun Hwan Jeong; Ji Hye Hong; Ji Ho Youk

Polyvinyl alcohol nanofibres containing silver nanoparticles are electrospun from solution for use in wound dressing applications. The solutions are prepared by refluxing PVA/silver nitrate aqueous solutions. The thermal properties of PVA nanofibres are improved by introducing small amounts of Ag. 5 refs.

Inha UniversityKOREA

Accession no. 993232

Item 111Journal of Applied Polymer Science104, No.3, 2007, p.1451PH-CONTROLLED UPHILL TRANSPORT OF BORIC ACID THROUGH A POLY(VINYL ALCOHOL) (PVA) MEMBRANE

References and Abstracts

Shimada T; Lizuka A; Shiojiri K; Yarnasaki A; Yanagisawa Y

The effects of pH conditions either side of a polyvinyl alcohol membrane on the transport of boric acid through the membrane were examined and it was shown that uphill transport of the boric acid would take place under certain conditions. Normal permeation based on concentration occurred under equal pH conditions but uphill transport took place when the acid side was kept at pH 5 and the base side at pH 10 and the concentration each side was initially equal. Permeation rate differences of trivalent and tetravalent boron hydroxide entities were used in the explanation of the phenomenon. 17 refs.

Tokyo University; AISTJAPAN

Accession no. 992319

Item 112European Polymer Journal43, No.4, 2007, p.1549MICROSTRUCTURE AND PROPERTIES OF POLY(VINYL ALCOHOL-CO-VINYL ACETATE)-G-EPSILON-CAPROLACTONEBecquart F; Taha M; Zerroukhi A; Kaczun J; Llauro M F

Microstructural studies of Poly(vinyl alcohol-co-vinyl acetate)-g-polycaprolactone (PVA-Ac)-g-(PCL) were realized principally using NMR. Initial PVA-Ac has a rather blocky structure with an average sequence length of PVA units equal to 12.5. During the synthesis of the studied (PVA-Ac)-g-(PCL) alcoholysis and transesterification reactions led to PCL grafts with acetate end groups. These reactions typically concern 2-5.5% of the total acetate groups. The influence of the local tacticity on the alcohol triad reactivity was evidenced and explained the incomplete functionalisation of the PVA-Ac hydroxyl groups. Alcoholysis reactions were also evidenced but with a very low rate in the tested conditions. Caprolactone hom*opolymerisation was not observed. Other properties of the final synthesised copolymers were also presented. Crystallinity totally disappeared in the (PVA-Ac)-g-(PCL). The glass transition temperature was perfectly adjustable by the Fox law without significant modification of the viscoelastic properties characterized by dynamic rheology. 9 refs.

St.Etienne Universite Jean Monnet; BASF AG; Federation des Polymeristes LyonnaisEUROPEAN COMMUNITY; EUROPEAN UNION; FRANCE; GERMANY; WESTERN EUROPE

Accession no. 992089

Item 113European Polymer Journal43, No.4, 2007, p.1123PREPARATION AND PROPERTIES OF POLY(VINYL ALCOHOL)/SILICA NANOCOMPOSITES DERIVED FROM

COPOLYMERIZATION OF VINYL SILICA NANOPARTICLES AND VINYL ACETATEXin Jia; Yanfeng Li; Qiong Cheng; Shujiang Zhang; Bo Zhang

Nanocomposites of poly(vinyl alcohol)/si l ica nanoparticles (PVA-SNs) were prepared by in-situ radical copolymerisation of vinyl silica nanoparticles functionalised by vinyltriethoxysilane (VTEOS) and vinyl acetate with benzoyl peroxide (BPO i.e. initiator) subsequently saponified via direct hydrolysis with NaOH solution. The resulting vinyl silica nanoparticles PVA-SNs were characterized by means of Fourier transformation spectroscopy (FTIR) transmission electron microscopy (TEM) and the elemental analysis method. Effects of silica nanoparticles on viscosity and alcoholysis of PVA-SNs were studied by a ubbelohode capillary viscometer and the back titration method. The morphological structure of PVA-SN films was investigated by scanning electron microscopy (SEM). Differential scanning calorimetry (DSC) thermogravimetric analysis (TGA) and tensile test were used to determine the thermal and mechanical properties of PVA-SN films. The results indicated that the content of vinyl groups on the surface of the vinyl silica nanoparticles was up to 3.02 mmol/g and vinyl silica nanoparticles had been successfully copolymerized with vinyl acetate. Furthermore compared to pure PVA silica nanoparticles bonded with polymer matrix in a low concentration affected the viscosity and alcoholysis of the PVA-SNs materials. At the same time it resulted in the improvement of the thermal and mechanical properties of the PVA-SN materials due to a strong interaction between silica nanoparticles and the polymer matrix via a covalent bond. It could be found that the optical clarity of the membrane was changed through UV-Vis absorption spectrum due to the introduction of silica nanoparticles. 30 refs.

Lanzhou University; Hexi UniversityCHINA

Accession no. 992048

Item 114Composites Part A38, No.5, 2007, p.1403STRUCTURAL BIOCOMPOSITES FROM FLAX - PART II: THE USE OF PEG AND PVA AS INTERFACIAL COMPATIBILISING AGENTSLiu Q; Stuart T; Hughes M; Sharma H S S; Lyons G

Flax fibre pre-treated in a 2-step process with a chelating agent for calcium followed by a commercial pectinolytic enzyme preparation was modified with either PVA (poly(vinyl acetate)) or PEG (poly(ethylene glycol)). After treatment the fibres were found to have undergone surface and bulk chemical changes identified through near infra-red spectroscopy (NIR) and differential thermo gravimetry (DTG). Changes to the linear density of the fibre were also found to have occurred. Modification with PVA and PEG did not result in any change in the fibre Young's modulus

References and Abstracts

but did result in a loss in tensile strength of about 15% accompanied by an increase in the coefficient of variation from around 10% to 25% indicating structural change to the fibre. When used as reinforcement in an epoxy matrix composite an increase in the composite's Young's modulus from ~4.5 GPa to 5.5 GPa was observed accompanied by a reduction in tensile strength strain to failure and work-of-fracture. It is believed that the PVA and PEG modify the interfacial behaviour in these systems improving fibre and matrix adhesion. 31 refs.

Wales University; Belfast Queen's University; Helsinki University of Technology; Northern Ireland Department of AgricultureEUROPEAN COMMUNITY; EUROPEAN UNION; FINLAND; SCANDINAVIA; UK; WESTERN EUROPE

Accession no. 992011

Item 115Materials Letters61, No.10, 2007, p.2015ONE-STEP PREPARATION OF POLY(VINYL ALCOHOL)-PROTECTED PT NANOPARTICLES THROUGH A HEAT-TREATMENT METHODLuo Y; Sun X

A heat-treatment method for the preparation of well-stable polymer-protected Pt nanoparticles in the range of 2-7 nm in diameter is demonstrated. The formation of Pt nanoparticles occurs in a single step process carried out by heating an aqueous solution containing a poly(vinyl alcohol) polymer and H2PtCl6 with the use of PVA to serve as both a reducing reagent and a protective reagent. The Pt nanoparticles were characterized by UV-vis absorption spectra transmission electron microscopy (TEM) and X-ray photoelectron spectrum (XPS) and the Pt nanoparticle formation process was further investigated by in situ UV-vis experiment. 19 refs.

China West Normal UniversityCHINA

Accession no. 991977

Item 116Polymer Preprints2006, 47, No.2, p.124PREPARATION AND CHARACTERIZATION OF BIODEGRADABLE NANOPARTICLES FOR TARGETED CANCER THERAPYOzturk E; Denkbas E B; Berestein G L

Nanoparticles of poly(L-lactide) (PLA) and chitosan were prepared with a view to using these in targeted cancer therapy. The PLA nanoparticles were prepared by a double emulsion method. Chitosan nanoparticles formed spontaneously when an aqueous tripolyphosphate (TPP) solution was added to chitosan solution under magnetic stirring. The size of the PLA nanoparticles was 230-350 nm and depended on the polymer and surfactant concentration. The chitosan particle size depended on the

polymer and TPP concentration and was between 280 and 730 nm. Studies were under way on the modification of the nanoparticles and ligand coating for active targeting of cancer cells. 6 refs.

HacettepeUniversity; TexasUniversityTURKEY; USA

Accession no. 991827

Item 117E-PolymersNo.33, 2007, p.1CHARACTERIZATION OF GENIPIN CROSSLINKED HYDROGELS COMPOSED OF CHITOSAN AND PARTIALLY HYDROLYZED POLY(VINYL ALCOHOL)Nand A V; Rohindra D R; Khurma J R

The synthesis of hydrogels based on semi-interpenetrating networks of chitosan and partially hydrolysed poly(vinyl alcohol)(PVA) in various proportions crosslinked with genipin a naturally occurring non-toxic crosslinking agent is described. The effects of temperature pH and proportion of PVA in the gel on swelling properties were investigated and the states of water in the swollen hydrogels were studied using DSC. 18 refs.

South Pacific UniversityFIJI

Accession no. 991423

Item 118Polymer Preprints 2006, 47, No.2, p.837DIFFUSIVE CHARACTERISTICS OF NANOPARTICLES IN A POLY(VINYL ALCOHOL) HYDROGELTester C C; DiCiccio A M; Chen W

The diffusion characteristics of rhodamine B a model reagent and gold nanoparticles in a poly(vinyl alcohol) (PVOH) hydrogel were examined. In the case of rhodamine B the diffusion and partition coefficients were 6 x 10-7 cm2/s and 1.8 respectively: these values were independent of the size and shape of the gels as well as the direction of diffusion. These results indicate that diffusion in the gel is much slower than that in solution and there are favourable interactions between rhodamine B and PVOH. Initial studies of the gold nanoparticles suggest that there are problems in determining the diffusive characteristics of a reactive species. 5 refs.

Mount Holyoke CollegeUSA

Accession no. 991334

Item 119Brittle Matrix Composites 8: Proceedings of a conference held Warsaw Poland 2006, Eds., A.M. Brandt; V.C. Liv; I.H. Marshall, Woodhead Publishing

References and Abstracts

2006, p.65INFLUENCE OF WATER-SOLUBLE POLYMERS ON THE MICROSTRUCTURE OF CEMENT MORTARSKnapen E; Van Gemert D; KU Leuven

In this paper the influence of water-soluble polymers on the microstructure of cement mortars is discussed. Cement hydration and polymer film formation are studied by means of SEM investigation and thermal analysis. The water-soluble polymers used were polyvinyl alcohol polyvinyl acetate methyl cellulose and hydroxy cellulose. Unmodified mortar beams did not show any well-developed morphology of calcium hydroxide crystals at the air void surfaces. Modification with small amounts of the water-soluble polymers resulted in the formation of needle-like C-S-H and calcium hydroxide crystals at those surfaces. Mortars modified with 1% methylcellulose were characterised by an abundant efflorescence of calcium hydroxide crystals. Between the closely packed layers of calcium hydroxide polymer bridges were detected forming additional bridges between the crystals. Thermal analyses showed a smaller amount of calcium hydroxide In cement pastes modified with water-soluble polymers but a higher total amount of bound water when compared to the unmodified pastes. 14 refs.

BELGIUM; EU; EUROPEAN COMMUNITY; EUROPEAN UNION; WESTERN EUROPE; WESTERN EUROPE-GENERALAccession no. 991053

Item 120Polymer Preprints.2006, 47, No.2, p.693SYNTHESIS OF HIGHLY ISOTACTIC POLY(VINYL ALCOHOL) BY LIVING CATIONIC POLYMERIZATIONHyun Jeong Jeon; Ji Hye Hong; Eun Hwan Jeong; Ji Ho Youk; Souk Il Mah

Synthesis of poly(tert-butyl vinyl ether) using living cationic polymerisation catalysed by iodine at a temperature of -78 degrees centigrade and its subsequent conversion to isotactic polyvinyl alcohol (PVOH) by hydrolysis using hydrogen bromide gas is described. The influence of various reaction features on the tacticity of the PVOH was discussed. Polymers were characterised using nuclear magnetic resonance spectroscopy and gel permeation chromatography. 5 refs.KOREA

Accession no. 990357

Item 121Polymer Preprints2006, 47, No.2, p.665SYNTHESIS AND LUMINESCENCE STUDIES OF POLY(VINYL ACETATE)-EUROPIUM(III) COORDINATION COMPOUND

Zhichuan Wu; Xueqian Wang; Tingxian Tao; Yudong Zhang; Yi Liu; Hao Fong

Synthesis of coordination compounds consisting of polyvinyl acetate and europium ions and which could be used as adhesive paints or in fabrics with unique luminescent properties is described. Coordination compounds were characterised using Fourier transform infrared Raman fluorescence and X-ray photoelectron spectroscopies. It was shown that luminescence emanated from both europium ions and polymer ligands and that fluorescence was approximately 3 times stronger than that from europium chloride solution. 4 refs.CHINA; USA

Accession no. 990344

Item 122Macromolecular Research15, No.1, 2007, p.22PREPARATION AND PROPERTIES OF WATERBORNE POLYURETHANE-UREA/POLY(VINYL ALCOHOL) BLENDS FOR HIGH WATER VAPOUR PERMEABLE COATING MATERIALSJong-Kook Yun; Hye-Jin Yoo; Han-Do Kim

Blending of aqueous polyvinyl alcohol (PVOH) solution and a waterborne polyurethane prepared by reacting dihydroxymethyl propionic acid methyl pyrrolidone and polytetramethylene oxide glycol was used to prepare high water vapour permeable coating materials for polyamide fabrics. The water soluble PVOH was dissolved out of the coating to give the microporosity. The effect of PVOH content on microporosity and permeability of the membrane was evaluated and as PVOH content increased so did pore size and permeability. Effects of dissolution time and temperature were considered. Coatings were characterised by Fourier transform infrared spectroscopy gravimetric analysis viscosity measurements thermogravimetric analysis dynamic mechanical thermal analysis stress-strain properties scanning electron microscopy and water vapour permeability measurements. 23 refs

Korea Institute of Footwear & Leather Technology; Pusan National UniversityKOREA

Accession no. 990314

Item 123ICIS Chemical Business Americas271, No.12, 2007, p.31POLYVINYL ALCOHOLKirschner M

A profile of polyvinyl alcohol is presented including US production capacities demand growth price uses market perspective and outlook. The largest application sector for PVAL in the US is the manufacture of polyvinyl butyral presently growing 2% annually. Polyvinyl butyral is used

References and Abstracts

in laminated safety glass for automotive windshields and load-resistant architectural glass applications. PVAL is used as a modifier in PVA emulsion adhesives that are used to bind wood and paper products and comprise many consumer glues as well. Annual growth in adhesives is slightly less at 1.7%. Demand for PVAL in paper coatings is expected to grow at 2.2% driven by increasing use of recycled fibres in printing stock. PVAL as a polymerisation aid in emulsified PVA and PVC is also doing well with growth projected at 2.5% annually.

Innovation GroupUSA

Accession no. 990188

Item 124Polymer Preprints2006, 47, No.2, p.578NOVEL COPOLYMERS OF VINYL ACETATE AND ALKOXY RING-SUBSTITUTED 2-PHENYL-11-DICYENOETHYLENESKharas G B; Russell S M; Diener C A; Johnson E A; McCreary K E; Chlupsa E; Nguyen V A T; O'Brien M R; Ogden-Schuette M E; Oliver J A; Walia N

Novel trisubstituted ethylenes ring substituted methyl 2-cyano-3-phenyl-2-propenoates are prepared via a base catalysed condensation of appropriate substituted benzaldehyde and malononitrile. The copolymerisation of the monomers with vinyl acetate results in equimolar alternating copolymers. The copolymers are characterised by nitrogen analysis IR spectroscopy and NMR spectroscopy. High glass transition temperatures indicates a substantial decrease in chain mobility in comparison with polyvinyl acetate due to the high dipolar character of the trisubstituted monomer unit. Copolymers decompose in the range 210-290 deg.C and occurs in two steps. 9 refs.USA

Accession no. 990104

Item 125 European Polymer Journal43, No.3, 2007, p.802PREPARATION AND STUDY OF PPV/PVA NANOFIBERS VIA ELECTROSPINNING PPV PRECURSOR ALCOHOL SOLUTIONWen Zhang; Eryun Yan; Zonghao Huang; Cheng Wang; Yi Xin; Qiang Zhao; Yanbin Tong

We have found a simple method to prepare poly(phenylene vinylene) (PPV) nanofibres via electrospinning PPV precursor alcohol solution under annealed at 180 deg.C in a N2 atmosphere. The nanofibres are uniform in diameter and long in decimetre magnitudes with resistance in decay which makes them have potential applications in optical and electronic devices. The morphology can be better controlled by blend PPV precursor solution with poly(vinylalcohol) (PVA) aqueous solution. The fluorescence spectrum of PPV/PVA nanofibres exhibited

China Northeast Normal University; Jimei Middle School; Heilongjiang UniversityCHINA

Accession no. 989957

Item 126Polymer Preprints2006, 47, No.2, p.313PROGRESS IN CLAY AEROGEL/POLYMER COMPOSITE MATERIALSSchiraldi D A; Bandi S A; Gawryla M D

The preparation of composites containing clay aerogels as nano-structured fillers was examined. Low-density aerogels can be produced from layered clays by using a simple and robust freeze-drying process. These materials possess a house-of-cards structure that can be filled or partially filled with an organic polymer by using a variety of simple processes to give interpenetrating structures that exhibit synergistic thermal mechanical and chemical properties are produced. For example polymerisation of N-isopropylacrylamide in toluene in the presence of a montmorillonite-derived aerogel gave composites containing up to 98 wt% of polymer. Poly(vinyl alcohol) (PVA)-aerogel composites were prepared by immersing aerogel monoliths in a solution of the polymer or by incorporating PVA in the clay gel used to produce the aerogel. Reinforcement effects are evident at lower filler levels than are required with conventional exfoliated clays resulting in lower overall densities in structural materials. 17 refs.USA

Accession no. 989099

Item 127Polymer Engineering and Science47, No.1, 2007, p.43PREPARATION AND PROPERTIES OF ELECTROSPUN POLY(VINYL ALCOHOL)/SILVER FIBER WEB AS WOUND DRESSINGSHong K H

A novel wound dressing material was prepared by electrospinning poly(vinyl alcohol) (PVA)/AgNO3 aqueous solution into nonwoven webs and then treating the webs by heat or UV radiation. Through SEM TEM and XPS analyses it was observed that the silver (Ag) nanoparticles were generated and existed in the near surface of the electrospun nanofibres. It was found that heat treatment as well as UV radiation reduced the Ag3+ ions in the electrospun PVA/AgNO3 fibre web into the Ag nanoparticles. Also the heat treatment improved the crystallinity of the electrospun PVA fibre web and so it made the web unsolved in moisture environment. Therefore it was concluded that the only heat treated electrospun

References and Abstracts

PVA/AgNO3 fibre web was a good material as wound dressings because it had structural stability in moisture environment as well as excellent antimicrobial ability and quick and continuous release of the effectiveness. 13 refs.

California University at DavisUSA

Accession no. 987889

Item 128Macromolecular SymposiaNo.243, 2006, p.190SYNTHESIS OF POLY(VINYL ALCOHOL) AND/OR POLY(VINYL ACETATE) PARTICLES WITH SPHERICAL MORPHOLOGY AND CORE-SHELL STRUCTURE AND ITS USE IN VASCULAR EMBOLIZATIONPeixoto L S; Silva F M; Niemeyer M A L; Espinosa G; Melo P A; Nele M; Pinto J C

During vascular embolisation a fine material is injected through a catheter in the blood vessel next to a tumoral region in order to interrupt the supply of nutrients to the lesioned area. Polyvinyl alcohol (PVA) is the most frequently used material due to its low toxicity good biocompatibility and desirable physical properties. Its synthesis is performed by the suspension polymerisation of vinyl acetate to produce polyvinyl acetate (PVAc) followed by the saponification of the PVAc particles. In this work it is shown that by using the suspension polymerisation technique it is possible to obtain spherical particles with a core-shell structure of PVA/PVAc with a regular morphology instead of particles with irregular shapes and sizes as usually found in many commercial embolisation products. This work presents details of the production of PVA/PVAc spherical particles that can be used to occlude blood vessels. 21 refs.

Rio de Janeiro Cidade Universitaria; Rio de Janeiro Universidade FederalBRAZIL

Accession no. 987658

Item 129ACS Polymeric Materials: Science and Engineerin, Fall Meeting 95, 2006, p.913EFFECT OF PREPARATION METHODS ON PROPERTIES OF CHITOSAN/POLY(VINYL ALCOHOL) HYDROGELSGuanghua He; Hua Zheng

Hydrogels based on blends of chitosan (CS) with poly(vinyl alcohol) (PVA) were prepared by chemical crosslinking with glutaraldehyde by a freeze-thaw method or by a combination of the two techniques. The hydrogels showed a good miscibility between the CS and PVA phases as a result of intermolecular hydrogen bonding but the network structures were dependent on with the method

of preparation. Studies of the swelling kinetics at pH 1.0 and pH 7.4 showed that CS/PVA hydrogels prepared by the freeze-thaw method had a higher swelling ratio but gradually dissolved at pH 1.0. The introduction of a large proportion of glutaraldehyde chemical crosslink led to a decrease in residual free sensitive amino groups and a decrease in the swelling ratio. Hydrogels made by a combination of the two methods were relatively stable at pH 1.0 and pH 7.4. 8 refs.CHINA

Accession no. 987001

Item 130ACS Polymeric Materials: Science and Engineering, Fall Meeting 95, 2006, p.883HIGH FLUX ULTRAFILTRATION MEMBRANES BASED ON POLY(ACRYLONITRILE) NANOFIBROUS SCAFFOLDS AND CROSSLINKED POLY(VINYL ALCOHOL) COATINGYoon K; Hsiao B S; Chu B

A new nanofibrous thin film composite ultrafiltration (UF) membrane based on an electrospun membrane of poly(acrylonitrile) with a cross-linked coating of poly(vinyl alcohol) (PVA) was prepared. The properties of the membrane could be altered by controlling the diameter of the electrospun fibre the membrane thickness and the molecular weights of the polymers in the coating. The highest molecular weight of crosslinked PVA (PVA235) gave a high and stable permeate flux at pressures of 50-130 psi. Compared with commercial high-flux PAN UF membranes in long-term (190 h) filtration the PVA/PAN composite membranes showed a much higher flux combined with a good rejection efficiency (99.5%). 4 refs.USA

Accession no. 986988

Item 131Composites Part B38, No.3, 2007, p.398PREPARATION AND CHARACTERIZATION OF NOVEL POLY-(VINYL ALCOHOL)-ZOSTERA FLAKES COMPOSITES FOR PACKAGING APPLICATIONSSapalidis A A; Katsaros F K; Romanos G E; Kakizis N K; Kanellopoulos N K

Composite films consisting of poly-(vinyl alcohol) (PVA) and Zostera flakes were prepared via film casting and their properties were investigated using a variety of techniques. The composites exhibit better mechanical and thermal properties than pure PVA while the optimum algal content is about 20% w/w. Although the water sorption capacity of the films is similar the measurements of mass transport properties on composites reveal improved gas barrier behaviour. This can be attributed to the resistance

References and Abstracts

in flow caused by impermeable algal particles. Based on their potential biodegradability and their low cost it can be concluded that the produced samples may offer a very promising bio-composite material for packaging applications. 40 refs.

NRCS DemokritosEUROPEAN COMMUNITY; EUROPEAN UNION; GREECE; WESTERN EUROPE

Accession no. 986838

Item 132European Polymer Journal43, No.2, 2007, p.460EFFECT OF NON-ASSOCIATED ELECTROLYTE SOLUTIONS ON THE BEHAVIOUR OF POLY(VINYL ALCOHOL)-BASED HYDROGELSPatachia S; Valente A J M; Baciu C

The aim of this paper is to present the behaviour of the poly(vinyl alcohol) hydrogels [PVA-HG] in sodium and potassium chlorides aqueous solutions due to their interactions. The tested [PVA-HG]-s have been obtained by repeated freezing and thawing cycles. White heterogeneous hydrogels have been obtained. These hydrogels exhibit a mechanical active behaviour at their contact with electrolytes aqueous solutions manifested by important changing in mass volume and density of the hydrogel samples. These modifications could be explained by water elimination from the hydrogels that initially reached the equilibrium of swelling. The kinetic of the water desorption and the reversibility of this process have been studied and some of the factors that influence this behaviour have been evidenced. The sensitivity of PVA hydrogels to electrolyte nature and concentration could be used in sensors design and also could explain some aspects of electrolytes diffusion through PVA membranes and targeted drugs delivery. 43 refs.

Brasov Transilvania University; Coimbra UniversityEASTERN EUROPE; EUROPEAN COMMUNITY; EUROPEAN UNION; PORTUGAL; RUMANIA; WESTERN EUROPE

Accession no. 986789

Item 133Construction and Building Materials21, No.3, 2007, p.583IMPROVING THE COMPRESSIVE STRENGTHS OF COLD-MIX ASPHALT USING ASPHALT EMULSION MODIFIED BY POLYVINYL ACETATEChavez-Valencia L E; Alonso E; Manzano A; Perez J; Contreras M E; Signoret C

Rut is the type of flexible pavement distress mostly occurring in Mexico generally caused by exceedingly heavy axle loads. Therefore the compressive strengths of cold-mix asphalt (CMA) must be improved for this reason a polyvinyl acetate emulsion (PVAC-E) was added to a cationic quick set emulsified asphalt to obtain a modified

asphalt emulsion that was mixed with a local aggregate in order to prepare two types of CMA. In the type I mix aggregates were coated by a film of asphalt-polyvinyl acetate (A-PVAC) binder. In the type II mix before the A-PVAC binder was layered the aggregate was covered with the polymer by mixing the aggregate in a diluted PVAC-E. Since the microparticles of the polyvinyl acetate were well dispersed in the asphalt paving mixture matrix for modified CMA type II the compressive strengths of test specimens were improved by 31% compared to the values obtained with the unmodified CMA. 21 refs.

Michoacana Universidad; Yucatan Centro de Investigacion y Estudios Avanzados del IPN; Monterrey Instituto Tecnologico y de Estudios SuperioresMEXICO

Accession no. 985740

Item 134Reactive and Functional Polymers66, No.12, 2006, p.1559ELECTROSPUN POLY(VINYL ALCOHOL)/GLUCOSE OXIDASE BIOCOMPOSITE MEMBRANES FOR BIOSENSOR APPLICATIONSGuanglei Ren; Xinhua Xu; Qiang Liu; Juan Cheng; Xiaoyan Yuan; Lili Wu; Yizao Wan

A novel technique for enzyme immobilisation on the surface of the Au electrode for designing amperometric biosensor by electrospinning poly(vinyl alcohol) (PVA) and glucose oxidase (GOD) is presented in this paper. The immobilised GOD remained active inside the electrospun PVA fibrous membranes. The membranes are promising candidates for immobilisation of enzymes because of their high specific surface area and porous structure. The infrared spectrum the UV-Vis spectrum and the scanning electronic microscopy of the membranes showed that the enzyme had been immobilised inside the PVA membranes. Chronoamperometric measurements demonstrated that electrospun fibrous enzymatic electrodes exhibited a rapid response (1 s) and a higher response current (muA level) to glucose in the normal and diabetic level. The linear response range (from 1 to 10 mM) and the lower detection limit (0.05 mM) of the sensor are satisfying. The electrospun method makes it convenient and efficient to prepare the enzymatic electrode for biosensors. 12 refs.

Tianjin UniversityCHINA

Accession no. 985674

Item 135Macromolecular SymposiaNo.242, 2006, p.146CHARACTERIZATION OF PVA AND CHITOSAN/PVA BLENDS PREPARED FROM AQUEOUS SOLUTIONS OF VARIOUS NA2SO4 CONCENTRATIONSDrambei P; Nakano Y; Yuezhen Bin; Okuno T; Matsuo M

References and Abstracts

A study was made of uniplanar orientation of a particular crystal plane along the surface of a PVAl film prepared by coagulation in a concentrated aqueous solution containing Na2SO4 and the orientation distribution functions of the crystallographic principal axes of the dried films determined by X-ray diffraction. Films were also prepared by biaxially stretching a fresh gel blend and a blend of chitosan and PVAl and the morphological properties of the film surfaces analysed by ESCA and contact angle measurements. 21 refs. (Polychar-14 World Forum on Advanced Materials Nara City Japan April 17-21 2006)NARA WOMEN'S UNIVERSITY; MUKOGAWA WOMEN'S UNIVERSITY

JAPAN

Accession no. 985054

Item 136ACS Polymeric Materials: Science and Engineering, Fall Meeting95, 2006, p.754SELF-STRATIFICATION OF POLYMETHYL METHACRYLATE/BUTYL ACRYLATE COLLOIDAL DISPERSIONS CONTAINING PVOH. A SPECTROSCOPIC STUDYRhudy K L; Su S; Howell H S; Urban M W

Details are given of the formation of methyl methacrylate-butyl acrylate copolymer particles in the presence of PVOH and film formation processes. Molecular level interactions of copolymer colloidal dispersions containing ionic species used to stabilise the particles were examined. Characterisation was undertaken using FTIR. 8 refs.USA

Accession no. 984972

Item 137Journal of Biomaterials Science: Polymer Edition17, No.6, 2006, p.669CELL GROWTH ON TISSUE-ENGINEERING SCAFFOLDS PREPARED BY GAMMA IRRADIATION GRAFTING OF VINYL PYRROLIDONE ONTO POLYVINYL ALCOHOLShariatpanahi R E; Orang F; Emami S H; Naimi T

Details are given of the grafting of vinyl pyrrolidone onto PVAL by gamma irradiation. PVA scaffolds were prepared by freeze-thaw and progen methods. The effect of cell attachment and growth was investigated using mouse fibroblast L-929 cells. 23 refs.

Tehran Amir Kabir UniversityIRAN

Accession no. 984913

Item 138Journal of Applied Polymer Science103, No.3, 2007, p.1664

EFFECT OF PVAC BONDING ON FINGER-JOINT STRENGTH OF STEAMED AND UNSTEAMED BEECH WOOD (fa*gUS SYLVATICA)Vassiliou V; Barboutis I; Karastergiou S

The effects of bonding by poly(vinyl acetate) (PVAc) [EN 204 (2001) durability classes D1 D2 and D3] finger length (4 and 10 mm) and finger orientation on the bending strength of finger-jointed steamed and unsteamed beech wood (fa*gus sylvatica) were examined. Specimens were prepared according to EN 385 (2001) and the modulus of rupture (MOR) and modulus of elasticity (MOE) of the samples were determined by the methods stipulated in the ISO 10983 (1999) and DIN 52186 (1978) standards. The MOR of unsteamed wood joints ranged from 33.51 to 82.24 N/mm2 whereas the MOR of the steamed wood joints varied from 34.9 to 80.27 N/mm2. Specimens with a finger length of 10 mm showed higher values of MOR than specimens with a finger length of 4 mm for both steamed and unsteamed wood. The MOE of the unsteamed specimens was not affected by finger jointing whereas the MOE of the steamed specimens increased slightly compared with solid wood. It is best to use a 10-mm finger length and D3-durability class PVAc adhesives to produce finger-jointed furniture lumber. 11 refs.

Thessaloniki Aristotle University; Larissa Technological Educational InstituteEUROPEAN COMMUNITY; EUROPEAN UNION; GREECE; WESTERN EUROPE

Accession no. 984621

Item 139Journal of Applied Polymer Science103, No.2, 2007, p.848SOLID-STATE GRAFTING OF SUCCINIC ANHYDRIDE ONTO POLY(VINYL ALCOHOL) Zheng-Fa Zhou; Wei-bing Xu; Dian He; Ji-xian Fan; Feng Yu; Feng-Mei Ren

The grafting of succinic anhydride onto poly(vinyl alcohol) catalysed by p-toluene sulphonic acid is described. The influence of reaction temperature reaction time amount of succinic anhydride and amount of catalyst on the graft reaction is studied. Uncrosslinked PVA graft copolymers with grafting degree up to 6.5% can be achieved at low reaction temperature short reaction time and low catalyst content. Crosslinked PVA with high gel content is obtained at high reaction temperature long reaction time and high catalyst content. 15 refs.

Hefei University of TechnologyCHINA

Accession no. 984467

Item 140 Polymer Degradation and Stability91, No.12, 2006, p.3397OXO-BIODEGRADABLE POLYMERS - EFFECT OF HYDROLYSIS DEGREE ON

References and Abstracts

BIODEGRADATION BEHAVIOUR OF POLY(VINYL ALCOHOL)Chiellini E; Corti A; Del Sarto G; D'Antone S

Poly(vinyl alcohol) (PVA) is considered to be one of the very few vinyl polymers soluble in water and susceptible to biodegradation in aqueous media by specific microorganisms implying oxidation of the carbon backbone followed by a random endocleavage of the polymer chains. The overall process does not appear to be appreciably affected by either degree of polymerisation (DPn) or degree of hydrolysis (HD) of PVA at least in the 100-1000 and 80-100% ranges respectively. In order to assess the effect of HD on the biodegradation propensity of PVA different PVA samples having similar DPn and noticeably different HD values were synthesised by controlled acetylation of commercial PVA (HD=99%) and submitted to biodegradation tests in aqueous medium mature compost and soil by using respirometric procedures. Re-acetylated PVA samples characterized by HD of between 25 and 75% underwent extensive mineralisation when buried in solid media whilst PVA (HD=99%) showed recalcitrance to biodegradation under those conditions. An opposite trend was indeed observed in aqueous solution thus suggesting that biodegradation is not an absolute attribute directly related to structural features of the substrate under investigation. Boundary conditions related to the framework under which the biodegradation assessment is undertaken have to be taken into account and specifically well defined. 39 refs.

Pisa UniversityEUROPEAN COMMUNITY; EUROPEAN UNION; ITALY; WESTERN EUROPE

Accession no. 984355

Item 141Electrochimica Acta52, No.4, 2006, p.1549DECOUPLED ION CONDUCTION MECHANISM OF POLY(VINYL ALCOHOL) BASED MG-CONDUCTING SOLID POLYMER ELECTROLYTEJeong S K; Jo Y K; Jo N J

Investigation on solid state rechargeable magnesium batteries are considered important similar to lithium batteries. In view of negligible hazard and less reactivity of the magnesium in comparison with lithium studies on rechargeable magnesium batteries are expected to have a wide scope in future. In the present investigations decoupled ion conduction of poly(vinyl alcohol) (PVA)-based Mg-conducting solid polymer electrolytes (SPEs) is essential component of the studies. In common SPEs ion transport has mostly been associated with the segmental motion of the polymer so significant conductivity is only observed above the glass transition temperature of the system. But the results of ac impedance spectroscopy FT-IR XRD and AFM indicated that prepared PVA-based Mg-conducting SPE shows ionic transport decoupled from

polymer segmental motion and high ionic conductivity at room temperature. 27 refs.

Pusan National UniversityKOREA

Accession no. 983470

Item 142Journal of Applied Polymer Science102, No.6, 2006, p.5789PREPARATION AND CHARACTERIZATION OF POLYACRYLIC ACID-POLY(VINYL ALCOHOL)-BASED INTERPENETRATING HYDROGELSHernandez R; Lopez D; Mijangos C

Rheological measurements to determine viscoelastic properties and swelling measurements were used to examine the structural features of interpenetrating hydrogels prepared from polyacrylic acid (PAA) and polyvinyl alcohol (PVAl) where the PAA is crosslinked to different degrees. Methylenebisacrylamide was used to crosslink the PAA in the presence of PVAl and freeze-thaw techniques result in the PVA hydrogel being retained within the PAA crosslinked hydrogel. Properties were examined with respect to the amount of crosslinking agent used in a single freeze-thaw cycle. 23 refs.

CSICEUROPEAN COMMUNITY; EUROPEAN UNION; SPAIN; WESTERN EUROPE

Accession no. 982902

Item 143Proceedings of the 64th SPE Annual conference (ANTEC 2006) held Charlotte, NCp.1510SHAPE MEMORY BINARY BLENDS: COMPOSITIONALLY TAILORED FIXING AND RECOVERYCampo C J; Mather P T

Semi-crystalline-amorphous blends exhibit shape memory due to (1) the elastomeric nature imparted by crystallites that act as physical crosslinks and (2) temporary shape fixing made possible by the vitrification of a continuous miscible amorphous phase. PVDF containing binary blends were studied using calorimetry and rheology in order to characterize the morphological control afforded by subjecting such materials to different thermal histories. The sensitivity of the aforementioned techniques to changes in blend morphology will also be discussed. 8 refs.USA

Accession no. 982364

Item 144Proceedings of the 64th SPE Annual conference (ANTEC 2006) held Charlotte, NCp.1494

References and Abstracts

ULTRA-THIN POLYMER FILMS: ELASTIC RESPONSE IN THE RUBBERY REGIMEO'Connell P A; McKenna G B

Using a novel micro-bubble inflation technique developed within our laboratory we are able to measure the absolute biaxial compliance of polymer films as thin as 13 nm. Experiments performed on both poly(vinyl acetate) (PVAc) and polystyrene (PS) films show that large reductions in the glass transition temperature at the nano-scale are non-universal viz. the PVAc shows no reduction even for the thinnest films while the PS shows a significant reduction at a thickness below approximately 80 nm. More surprisingly the rubbery plateau region for both materials shows dramatic stiffening (>300 times) perhaps due to surface pinning of the entanglement network. The compliance increases as approximately the square of film thickness. 10 refs.USA

Accession no. 982360

Item 145Proceedings of the 64th SPE Annual conference (ANTEC 2006) held Charlotte,NC p.1366ELECTROSPUN PVA FIBERS AS PRECURSOR TO SYNTHESIZE HYDROXYAPATITEDai X; Shivkumar S

PVA (Polyvinyl alcohol) with various molecular weights (Mw) were electrospun with a Calcium Phosphate based sol. Fibres on the order of 2 mum with uniformly distributed sol particles were obtained. Electrospinning process may be facilitated with high molecular weight polymers. The distribution of sol in the electrospun structure may depend on polymer/sol ratio. XRD results indicate that the fibres after calcination consisted predominantly of hydroxyapatite. 20 refs.

EUROPEAN COMMUNITY; EUROPEAN UNION; UK; WESTERN EUROPEAccession no. 982337

Item 146ACS Polymeric Materials: Science and Engineering. Spring Meeting94, 2006, p.685MODIFICATION OF CEMENT MORTARS BY DIFFERENT POLYMER LATEXES AND CURING PROCESSESBing Geng; Shuxiang Zhang; Pandeng Xia; Xiang Z Kong

Cement mortars were prepared with three different polymer latices. Latices were prepared by emulsion polymerisation from vinyl acetate vinyl acetate and acrylic acid and chlorotrifluoroethylene (CTFE) and vinyl acetate. Polymer mortars were compared for their flexural and compression strengths and were examined using

scanning electron microscopy. The fluorinated polymer gave the best reinforcement. Further mortars with different fluoropolymer contents were prepared and cured in air and in water. The air cured product proved to have the best performance. 8 refs.CHINA

Accession no. 981986

Item 147Journal of Applied Polymer Science102, No.5, 2006, p.4831PREPARATION OF HIGH-MOLECULAR-WEIGHT POLY(VINYL ALCOHOL) WITH HIGH YIELD BY SOLUTION POLYMERIZATION OF VINYL ACETATE IN METHANOL USING 44'-AZOBIS(4-CYANOVALERIC ACIDLyoo W S; Song D H; Lee W C; Han S S; Noh S K

The effects of polymerisation temperature and initiator concentration on the polymerisation of vinyl acetate (VAc) was in methanol solution at 40 deg.C and 50 deg.C using 4,4'-azobis(4-cyanovaleric acid) (ACVA) as an initiator. The lower rate of polymerisation obtained by using ACVA and the lower viscosity of methanolic solutions resulted in the production of linear high-molecular weight (HMW) poly(vinyl acetate) (PVAc) with a high conversion. Poly(vinyl alcohol) (PVA) with a maximum number-average degree of polymerisation (Pn) of 4300 could be prepared by saponification of PVAc with a maximum Pn of 7900 obtained by polymerisation at an ACVA concentration of 2 x 10-5 mol/mol of VAc at 40 deg.C. Moreover a degree of branching of below 1 could be obtained by using the ACVA system at 40 or 50 deg.C. This suggests an easy way for producing HMW PVA with a high yield by conventional solution polymerisation without the use of special methods such as low-temperature cooling or irradiation. 13 refs.

Yeungnam University; Kyungil UniversitySOUTH KOREA

Accession no. 981789

Item 148Journal of Applied Polymer Science102, No.5, 2006, p.4665SWELLING OF PH-SENSITIVE CHITOSAN-POLY(VINYL ALCOHOL) HYDROGELSGunasekaran S; Wang T; Chai C

The swelling properties of chitosan-poly(vinyl alcohol) (PVA) hydrogels were investigated as functions of the pH and salt concentration of the medium. Maximum swelling of the hydrogels occurred at a buffer pH of approximately 3 regardless of the PVA content in the hydrogels. The maximum mass of the swollen hydrogels was about 13 times that of the contracted counterparts. Cyclic swelling and contraction between pH 3 and pH 7 buffers and between pH 3 buffer and pH 3 buffer plus salt confirmed that the hydrogels swell by a Donnan mechanism. The

References and Abstracts

swelling mechanism involves transfer of water molecules driven by a concentration gradient. The effective mass-transfer coefficient of water molecules during swelling estimated by means of a model gradually decreased with increasing PVA content in the hydrogels. 20 refs.

Madison University of Wisconsin; Tianjin UniversityCHINA; USA

Accession no. 981768

Item 149Journal of Power Sources162, No.1, 2006, p.21DEVELOPMENT OF ALKALINE DIRECT METHANOL FUEL CELLS BASED ON CROSSLINKED PVA POLYMER MEMBRANESChun-Chen Yang; Shwu-Jer Chiu; Wen-Chen Chien

A novel crosslinked PVA/SSA (10 wt% sulphosuccinic acid) solid polymer membrane was obtained by a solution casting technique. An alkaline direct methanol fuel cell (DMFC) is composed of an air cathode with a mixture of Mn O2/BP2000+CNT binary carbon inks a Ti-based anode electrode with PtRu black inks (varied from 0.25 to 4.50 mgcm-2) and an alkaline crosslinked PVA/SSA solid polymer membrane. The electrochemical characteristics of the anode and cathode electrodes were investigated by the linear polarisation method cyclic voltammetry (CV) analysis potentiostatic method and AC impedance spectroscopy. A Ti-mesh (Delker) with a thickness of 0.1 mm was used as a current collector on the anode electrode without a diffusion layer which greatly reduced the mass transfer resistance for the electrode reaction. It was demonstrated that the alkaline DMFC using this novel crosslinked PVA/SSA solid polymer membrane showed excellent electrochemical performance at ambient temperature and pressure. The maximum peak current density of the DMFC was about 4.13 mW/cm2 at 60 deg.C and 1 atm in 2M KOH+2M CH3OH solution. 38 refs.

Mingchi University of TechnologyTAIWAN

Accession no. 981558

Item 150 Journal of Adhesion Science and Technology20, No.12, 2006, p.1273VISCOMETRIC STUDY OF AQUEOUS POLY(VINYL ALCOHOL) (PVA) SOLUTIONS AS A BINDER IN ADHESIVE FORMULATIONSMohsen-Nia M; Modarress H

The viscosities of aqueous PVAl solutions were measured using an Ostwald viscometer and the data obtained fitted to a modified version of Eyring's viscosity model developed by the authors. The densities of the PVAl solutions and average molec.wts. of the PVAl required for viscosity calculations were determined and the densities expressed by a simple linear equation in terms of PVAl weight fraction. 20 refs.

Kashan University; Amirkabir UniversityIRAN

Accession no. 981096

Item 151Chemical Engineering Science61, No.10, 2006, p.3149GROWTH CONTROL OF ICE CRYSTALS BY POLY(VINYL ALCOHOL) AND ANTIFREEZE PROTEIN IN ICE SLURRIESInada T; Modak P R

Effect of poly(vinyl alcohol) (PVA) in inhibiting an increase in ice crystal size in isothermal ice slurries was investigated and then compared with the effect of an antifreeze protein (AFP) NaCl and three other polymers namely poly(ethylene glycol) poly(vinyl pyrrolidone) and poly(acrylic acid). First ice slurries in which the initial size distribution of ice crystals was known were isothermally preserved for given periods of time (typically 300min) in the presence of PVA AFP type I NaCl or the other three polymers. Then the average size of the ice crystals was measured using image processing. Both the PVA and AFP type I completely inhibited the increase in ice crystal size at such low concentrations that the melting temperature of the solution was -0.010 deg.C whereas NaCl and the other three polymers clearly increased the ice crystal size due to Ostwald ripening. This inhibition effect of PVA and AFP type I was caused by thermal hysteresis which is often taken as the primary manifestation of non-equilibrium antifreeze activity of these additives and defined as the difference between the melting temperature and non-equilibrium freezing temperature at which ice crystals start to grow in solution. The increase in ice crystal size was inhibited when the thermal hysteresis surpassed the driving potential for Ostwald ripening. Using PVA which exhibits thermal hysteresis is a novel technique to completely inhibit the increase in ice crystal size in isothermal ice slurries. 36 refs.

AISTJAPAN

Accession no. 980482

Item 152Journal of Membrane Science276, No.1-2, 2006, p.42CERAMIC-SUPPORTED THIN PVA PERVAPORATION MEMBRANES COMBINING HIGH FLUX AND HIGH SELECTIVITY; CONTRADICTING THE FLUX-SELECTIVITY PARADIGMPeters T A; Poeth C H S; Benes N E; Buijs H C W M; Vercauteren F F; Keurentjes J T F

Thin high flux and highly selective cross-linked poly(vinyl)alcohol water selective layers have been prepared on top of hollow fibre ceramic supports. The supports consist of an alpha-Al2O3 hollow fibre substrate

References and Abstracts

and an intermediate gamma-Al2O3 layer which provides a sufficiently smooth surface for the deposition of ultra-thin PVA layers. Membranes have been characterised by SEM and pervaporation experiments. The thickness of the PVA layer formed on top of the gamma-Al2O3 intermediate layer is in the order of 0.3-0.8μm. No significant infiltration of PVA into the intermediate gamma-Al2O3 layer can be observed. In the dehydration of 1-butanol (80 deg.C 5wt.% water) the membranes exhibit a high water flux (0.8-2.6kg/m2/h) combined with a high separation factor (500-10000). The values for the flux and separation factor exceed typical values obtained for cross-linked PVA membranes on polymeric supports. In the dehydration of 2-propanol and 1-butanol a simultaneous increase in both water flux and separation factor is observed with increasing temperature or water concentration. This remarkable behaviour is in contrast to the trade-off generally observed for polymer membranes i.e. an increase in flux is typically combined with a decrease in separation factor. A possible explanation for this behaviour is a low degree of three-dimensional swelling in the vicinity of the gamma-Al2O3-PVA interface due to an enhanced structural stability. In the dehydration of ethanol and 1-propanol the traditional trade-off between flux and selectivity was observed. 21 refs.

Eindhoven University of Technology; TNO Science and IndustryEUROPEAN COMMUNITY; EUROPEAN UNION; NETHERLANDS; WESTERN EUROPE

Accession no. 980457

Item 153Journal of Applied Polymer Science102, No.4, 2006, p.3934RHEOLOGICAL PROPERTIES OF HIGH MOLECULAR WEIGHT (HMW) SYNDIOTACTIC POLY(VINYL ALCOHOL) (PVA)/HMW ATACTIC PVA BLEND SOLUTIONSLyoo W S; Yeum J H; Kwon O W; Shin D S; Han S S; Kim B C; Jeon H Y; Noh S K

Water-soluble syndiotactic-poly(vinyl alcohol) (s-PVA) and atactic-PVA with syndiotactic diad contents of 58.5 and 54.0% respectively were prepared by bulk copolymerisation of vinyl pivalate and vinyl acetate (VAc) and by solution polymerisation of VAc to give poly(vinyl pivalate-co-vinyl acetate) and poly(vinyl acetate) respectively which were then subjected to saponification. At frequencies of 10-1 to 102 rad/s s-PVA/a-PVA blend solutions with larger s-PVA contents showed more shear thinning suggesting that PVA molecules become more readily oriented as the s-PVA content is increased. The yield stress was also higher for s-PVA/a-PVA blend solutions with larger s-PVA contents suggesting that more domains with an internal order are produced at higher s-PVA contents in the s-PVA/a-PVA blend solutions. 25 refs.

Yeungnam University; Kyungpook National University; Hanyang University; Inha UniversitySOUTH KOREA

Accession no. 979602

Item 154Journal of Applied Polymer Science102, No.4, 2006, p.3273RED EMISSION FROM EU3+: PVA POLYMER FILMRaju G S R; Buddhudu S; Rajulu A V

Bright-red luminescent films of Eu3+-doped poly(vinyl alcohol) (PVA) were produced by solution casting. The emission performance of these films was studied by measurements of excitation emission and lifetimes. The doped films emitted bright-red light on irradiation with a UV source. Emission processes in the system was explained by an energy-level scheme. 25 refs.

Anantapur S.K.UniversityINDIA

Accession no. 979521

Item 155Journal of Membrane Science283, No.1-2, 2006, p.281CORRELATION OF PHYSICOCHEMICAL CHARACTERISTICS WITH PERVAPORATION PERFORMANCE OF POLY(VINYL ALCOHOL) MEMBRANESHyder M N; Huang R Y M; Chen P

In this research hydrophilic poly(vinyl alcohol) PVA membranes were prepared and its surface and bulk properties e.g. surface roughness and crosslinking were characterized using Fourier transform infrared (FTIR) spectroscopy atomic force microscopy (AFM) and differential scanning calorimetry (DSC) and contact angle measurements. The PVA membranes were crosslinked in two ways: by heating at 125 deg.C or by chemical reaction with glutaraldehyde at room temperature. They were used for pervaporation applications and dehydration of ethanol-water mixture was demonstrated in this paper. Compared to non-crosslinked membranes the crosslinked membranes were shown to change in chemical structure by FTIR and become less hydrophilic by water contact angle measurement. The contact angle of the membranes increases with increasing the glutaraldehyde concentration used in crosslinking solution. AFM surface scans showed that the membrane surfaces are rough in nanometer scale and affected by the crosslinking treatment on the membranes. DSC measurements showed an increase in melting temperature of the polymer membranes after crosslinking. Dehydration of ethanol-water mixture was conducted over a range of ethanol concentrations (10-70wt.%) in feed solution and at varied temperatures (from 25 to 50 deg.C). The dehydration results are presented and correlated with the results of the physicochemical measurements of the membranes. 35 refs.

References and Abstracts

Waterloo UniversityCANADA

Accession no. 979273

Item 156Journal of Applied Polymer Science102, No.3, 2006, p.2315PREPARATION AND CHARACTERIZATION OF PVA/OMMT COMPOSITESYurudu C; Isci S; Unlu C; Atici O; Ece O I; Gungor N

Composites of poly(vinyl alcohol) (PVA) with organically modified montmorillonite (MMT) were prepared and characterised. MMT dispersions were modified by the addition of various concentrations of hexadecylamine (HDA) to a 2 wt% montmorillonite dispersion. The basal spacing of the resulting organoclay was studied by X-ray diffraction. FTIR spectroscopy revealed the presence of characteristic absorbencies after treatment with HDA. The HDA/MMT/PVA composites were prepared by treatment of a 1 wt% PVA solution with the MMT/HAD organoclay complex and characterised by a range of techniques. The effect of the solids content on the rheological behaviour of aqueous MMT dispersions was also examined. 21 refs.

Istanbul Technical UniversityTURKEY

Accession no. 978405

Item 157Polymers and Polymer Composites14, No.6, 2006, p.577NEW BIODEGRADABLE BLENDS FROM ALIPHATIC POLYCARBONATE AND POLY(VINYL ALCOHOL)Cao Y X; Du F G; Wang X L; Meng Y Z

Blends of biodegradable polymers based on polypropylene carbonate and polyvinyl alcohol were prepared by solution casting. Various blend ratios were investigated with reference to thermal and mechanical properties and morphology. Thermogravimetric analysis DSC static mechanical measurements SEM and FTIR techniques were used to characterise the blends. Polypropylene carbonate/polyvinyl alcohol blends (PPC/PVA) with a 10% PVA and 40% PVA ratio were found to be miscible systems but PPC/20% PVA and PPC/30% PVA blends were found to be two-phase systems. Both tensile strength and modulus increased with increasing PVA content due to a strong interaction between the PPC and PVA phases through hydrogen bonding. Blending PVA with PPC was shown to provide an effective way to increase both the thermal stability and mechanical properties of polypropylene carbonate. 16 refs

Sun Yat-Sen UniversityCHINA

Accession no. 977958

Item 158Materials Research9, No.2, 2006, p.185SYNTHESIS AND CHARACTERIZATION OF POLY(VINYL ALCOHOL) HYDROGELS AND HYBRIDS FOR RMPB70 PROTEIN ADSORPTIONDos Reis E F; Campos F S; Lage A P; Leite R C; Heneine L G; Vasconcelos W L; Lobato Z I P; Mansur H S

The synthesis of hydrogels of poly(vinyl alcohol)(PVA) crosslinked with glutaraldehyde with or without the addition of tetraethylorthosilicate and their hybrids with recombinant MPB70 protein and their characterisation by FTIR is described. The application of the PVA hydrogels and hybrids for immunological assay using enzyme-linked immunosorbent assay (ELISA) techniques and the results are discussed in terms of protein adsorption. 26 refs.

Minas GeraisUniversidade Federal; Minas GeraisFundacao Ezequiel DiasBRAZIL

Accession no. 977263

Item 159Journal of Applied Polymer Science102, No.2, 2006, p.1553ALGINATE-POLY(VINYL ALCOHOL) CORE-SHELL MICROSPHERES FOR LIPASE IMMOBILIZATIONDe Queiroz A A A; Passos E D; Alves S De B; Silva G S; Higa O Z; Vitolo M

Triacylglycerol ester hydrolase (EC 3.1.1.3) was encapsulated in microspheres of sodium alginate (AlgNa) and poly(vinyl alcohol) (PVA). Spherical AlgNa/PVA beads with an average diameter of 400 microns were prepared by ionotropic gelation of an AlgNa/PVA blend in the presence of calcium tetraborate. The increased glass-transition temperature of the microspheres indicated specific crosslinking of the component polymers. The water diffusion coefficients increased with increasing PVA content in the microspheres indicating a decrease in the resistance to mass transfer through the AlgNa/PVA microsphere wall. The Michaelis constant and the maximum reaction velocity for the free and immobilised lipase showed that affinity of the enzyme for the substrate remained high after immobilisation in the microspheres. 33 refs.

Itajuba Universidade Federal; BrazilInstituto de Pesquisas Energeticas e Nucleares; Sao Paulo UniversityBRAZIL

Accession no. 977109

Item 160Journal of Applied Polymer Science102, No.2, 2006, p.1152

References and Abstracts

DEHYDRATION OF TETRAHYDROFURAN BY PERVAPORATION USING CROSSLINKED PVA/PEI BLEND MEMBRANESRao P S; Sridhar S; Krishnaiah A

Dense membranes suitable for the dehydration of tetrahydrofuran (THF) by pervaporation were prepared by blending hydrophilic poly(vinyl alcohol) (PVA) and poly(ethyleneimine) (PEI) and crosslinking with glutaraldehyde (GA) in a mixture of solvents containing hydrochloric acid as a catalyst. The membranes were potentially useful for separating the THF/water azeotrope (94 wt%) and produced fluxes of 1.072 and 0.376 kg/m2 h and selectivities of 156 and 579 for plain and crosslinked PVA/PEI respectively. The selectivity improved with decreasing water concentration in the feed and with increasing membrane thickness whereas the flux decreased correspondingly. A high permeate pressure produced a reduction in both the flux and selectivity. These effects were explained in terms of known relationships between the plasticisation effect degree of swelling permeate pressure and feed water concentration. 43 refs.

Sri Venkateswara University; Indian Institute of Chemical TechnologyINDIA

Accession no. 977058

Item 161Journal of Applied Polymer Science102, No.2, 2006, p.1129ELECTRON BEAM SYNTHESIS AND CHARACTERIZATION OF POLY(VINYL ALCOHOL)/MONTMORILLONITE NANOCOMPOSITESAbd Alla S G; El-Din H M N; El-Naggar A W M

Nanocomposites of poly(vinyl alcohol) (PVA) and montmorillonite clay (MMT) in the form of films were prepared by means of electron-beam irradiation. A 20-kGy dose electron beam irradiation was optimal for producing hom*ogeneous nanocomposites films with the highest degree of gel formation. The introduction of up to 4 wt% of MMT resulted in an improvement in the tensile strength elongation at break and thermal stability of the PVA matrix. The intercalation of PVA with the MMT also led to a markedly improved water resistance indicating that the clay was well dispersed in the polymer matrix. The intercalation had no effect on the metal uptake capability of PVA. X-ray diffraction patterns and scanning electron micrographs showed the coexistence of exfoliated intercalated MMT layers over the range of MMT contents studied. DSC thermograms showed that intercalation of the PVA polymer with these levels of MMT had no effect on melting transitions but the glass transition temperature for PVA completely vanished even at low contents of MMT. 24 refs.

Egypt National Centre for Radiation Res.& Technol.EGYPT

Accession no. 977055

Item 162Journal of Applied Polymer Science102, No.2, 2006, p.1014EFFECT OF MOLECULAR WEIGHT ON DIELECTRIC PROPERTIES OF POLYVINYL ALCOHOL FILMSJoshi G; Pawde S M

Impedance analysis was performed on films prepared from poly(vinyl alcohol) (PVA) films with two different molecular weights. The dielectric polarisation of PVA film was measured at normal temperatures and pressures over the frequency range 20 Hz to 1 MHz. The effects of simultaneous application of DC bias potential from 0 to 40 V with AC signal for measurement of over all electrical parameters were examined. The dielectric constant of low-molecular weight PVA film were higher than those for high-molecular weight PVA in agreement with the Maxwell-Wagner theory. 12 refs.

Mumbai Watumull Institute of Technology; Mumbai University Institute of Chemical TechnologyINDIA

Accession no. 977041

Item 163Plastic Packaging Innovation News2, No.16, 2006, p.6TYPICAL PROPERTIES OF PVOH FILMS COMPARED TO OTHER TRADITIONAL FILM MATERIALS

A table is presented listing properties of PVAL cellophane PVC and PE films including clarity gloss water vapour transmission tear strength tensile strength and elongation at break.WORLD

Accession no. 977005

Item 164Polymer47, No.19, 2006, p.6868PURE SHEAR DEFORMATION OF PHYSICAL AND CHEMICAL GELS OF POLY(VINYL ALCOHOL)Urayama K; Ogasawara S; Takigawa T

Pure shear deformation reveals the significant differences in elastic properties of the poly(vinyl alcohol) (PVA) gels with almost identical initial modulus but with different types of crosslinks physical crosslinks formed by microcrystallites and chemical crosslinks made of covalent bonds. The ratio of the two principal stresses steeply increases with elongation in the physical gels while that remains almost constant independently of stretching

References and Abstracts

in the chemical gels. The marked growth of the stress ratio with elongation in the physical gels leads to the negative values of the derivative of the elastic free energy (W2) with respect to the second invariant of the deformation tensor in the whole range of deformation which is firstly observed for elastomeric materials. By contrast the chemical gels exhibit the positive values of W2 like most chemically crosslinked rubbers. Among the existing theories of rubber elasticity the classical non-Gaussian three-chain model considering the effect of finite chain-length is qualitatively successful in accounting for the steep increase of the stress ratio and the negative values of W2 in the physical gels although it fails to reproduce the large difference in the stress-strain behaviour among uniaxial pure shear and equi-biaxial deformations. These features of the physical gels are expected to stem from the structural characteristics such as fewer amounts of slippery-trapped entanglement along network strands compared to the chemical PVA gels. 27 refs.

Kyoto UniversityJAPAN

Accession no. 976860

Item 165European Polymer Journal42, No.9, 2006, p.2013A NANOFIBROUS COMPOSITE MEMBRANE OF PLGA-CHITOSAN/PVA PREPARED BY ELECTROSPINNINGDuan B; Yuan X; Zhu Y; Zhang Y; Li X; Zhang Y; Yao K

Tissue engineering scaffolds produced by electrospinning feature a structural similarity to the natural extracellular matrix. In this study poly(lactide-co-glycolide) (PLGA) and chitosan/poly(vinyl alcohol) (PVA) were simultaneously electrospun from two different syringes and mixed on the rotating drum to prepare the nanofibrous composite membrane. The composite membrane was crosslinked by glutaraldehyde vapour to maintain its mechanical properties and fibre morphology in wet stage. Morphology shrinkage absorption in phosphate buffered solution (PBS) and mechanical properties of the electrospun membranes were characterized. Fibroblast viability on electrospun membranes was discussed by MTT [3-(45-dimethylthiazol-2-yl)-25-diphenyl tetrazolium bromide] assay and cell morphology after 7days of culture. Results indicated that the PBS absorption of the composite membranes no matter crosslinked or not was higher than the electrospun PLGA membrane due to the introduction of hydrophilic components chitosan and PVA. After crosslinking the composite membrane had a little shrinkage after incubating in PBS. The crosslinked composite membrane also showed moderate tensile properties. Cell culture suggested that electrospun PLGA-chitosan/PVA membrane tended to promote fibroblast attachment and proliferation. It was assumed that the nanofibrous composite membrane of electrospun PLGA-chitosan/PVA could be potentially used for skin reconstruction. 36 refs.

Tianjin University; Tianjin HospitalCHINA

Accession no. 976782

Item 166Journal of Membrane Science280, No.1-2, 2006, p.802ALKALINE ZN-AIR AND AL-AIR CELLS BASED ON NOVEL SOLID PVA/PAA POLYMER ELECTROLYTE MEMBRANESWu G M; Lin S J; Yang C C

High ionic conducting solid polymer electrolyte membranes (SPEM) had been successfully prepared from poly(vinyl alcohol) (PVA) and poly(acrylic acid) (PAA). The solution casting method yielded highly hydrophilic membranes with uniform structure that were suitable for electrochemical applications. The room temperature ionic conductivity of the alkaline PVA/PAA polymer electrolyte membranes was in the range of 0.142-0.301S/cm-1 depending on the composition. The cyclic voltammetry analysis was carried out using Zn|SPEM|Zn and Al|SPEM|Al cells. The analysis results revealed the excellent electrochemical stability of these newly developed alkaline solid PVA/PAA polymer electrolyte membranes. Metal-air fuel cells were also prepared from the alkaline solid PVA/PAA polymer electrolyte membranes. The electrochemical cell performance was evaluated based on Zn-air and Al-air cells at C/10 and C/5 discharge rates. The experimental results exhibited high percent of utilisation for metal powders at room temperature. It was up to 90% for Zn-air cell when assembled with PVA:PAA=10:7.5 polymer electrolyte membrane and discharged at C/10 rate. The power density could be as high as 50mMW/cm2 at room temperature. However the cell percent utilisation was reduced to 73% with the same composition electrolyte membrane when C/5 discharge rate was tested. 16 refs. TAIWAN

Taiwan Chang Gung University; Taipei Ming Chi University of TechnologyTAIWAN

Accession no. 975661

Item 167Polymer Preprints2005, 46, No.1, p.632EFFECT OF PLASTICIZER ON PVAC-D3 DYNAMICS USING DEUTERIUM SOLID STATE NMRNambiar R R; Blum F D

The effect of dipropylene glycol dibenzoate plasticiser on the glass-transition temperature (Tg) of poly(vinyl acetate) was studied by deuterium solid-state NMR. The Tg of various plasticised samples was determined as the temperature where the NMR spectra collapsed into a broad single peak. For an unplasticised sample this occurred at between 65 and 70 deg.C and was roughly centred at 68 deg.C. The Tg of the plasticised polymer decreased with

References and Abstracts

increasing plasticiser content and was 49 deg.C for a sample containing 20% plasticiser. 7 refs.USA

Accession no. 974688

Item 168Journal of Applied Polymer Science101, No.5, 2006, p.3493PREPARATION AND ELECTRORESPONSIVE PROPERTY OF POLY(VINYL ALCOHOL)/SODIUM ALGINATE COMPOSITE HYDROGELLi R X; Zhang X Z; Zhao J S; Wu J M; Guo Y; Guan J

A composite hydrogel of poly(vinyl alcohol) (PVA) and sodium alginate was prepared repeatedly freezing and thawing mixed solutions of PVA and sodium alginate. The composite hydrogel in aqueous NaCl solution showed swelling contraction and bending behaviour in the presence of a dc electric field. The bending speed and maximum degree of bending increased with increasing electric field intensity and NaCl solution concentration. The maximum degree of bending increased with increasing sodium alginate content in the composite hydrogel. 18 refs.TAIWAN

Tianjin Institute of Medical Equipment; Tianjin Polytechnic UniversityTAIWAN

Accession no. 972860

Item 169Journal of Applied Polymer Science101, No.5, 2006, p.3040THERMALLY STIMULATED DEPOLARIZATION CURRENT BEHAVIOR OF POLYETHYLENE/POLY(VINYL ACETATE) BLENDS: EFFECT OF BLENDINGChoure C; Keller J M; Bajpai R

Thermally stimulated depolarisation currents (TSDCs) in polyethylene/poly(vinyl acetate) blends were examined as a function of the polarizing temperature applied field and proportion of poly(vinyl acetate) in the blend. The peak TSDC current decreased and the its position shifted toward to a lower temperature as with increasing proportions of the poly(vinyl acetate) in the blends. The tendency of the current to flow in the same direction as the charging current also increased. Blending with poly(vinyl acetate) modifies increases the proportion of amorphous material in the polyethylene blends. The carriers with a mobility enhanced by hopping centres related to carbonyl groups in the amorphous portion were mainly localised in shallow traps. 32 refs.

Rani Durgavati UniversityINDIA

Accession no. 972800

Item 170Polymer47, No.10, 2006, p.3591MICROSTRUCTURAL STUDIES ON BACL2 DOPED POLY(VINYL ALCOHOL)Bhajantri R F; Ravindrachary V; Harisha A; Crasta V; Nayak S P; Poojary B

We have studied the effect of BaCl2 dopant on the optical and microstructural properties of a polymer poly(vinyl alcohol) (PVAl). Pure and BaCl2 doped PVA films were prepared using solvent casting method. These films were characterized using FTIR UV-visible XRD and DSC techniques. The observed peaks around 3425 cm-1 at 1733 cm-1 and 1640 cm-1 in the FTIR spectra were assigned to O-H C=C stretching and acetyle C=O group vibrations respectively. In the doped PVAl shift in these bands can be understood on the basis of intra/inter molecular hydrogen bonding with the adjacent OH group of PVA. The UV-visible spectra shows the absorption bands around 196 nm and shoulders around 208 nm with different absorption intensities for doped PVAl which are assigned to n->pi*transition. This indicates the presence of unsaturated bonds mainly in the tail-head of the polymer. Optical band energy gap is estimated using UV-visible spectra and it decreases with increasing dopant concentration. The powder XRD shows an increase in crystallinity in the doped PVAl which arises due to the interaction of dopant with PVAl causing a molecular rearrangement within the amorphous phase of polymer. These modifications also influence the optical property of the doped polymer. The DSC study also supports increasing crystalline thickness and degree of crystallinity due to doping. 17 refs.

Mangalore UniversityINDIA

Accession no. 972463

Item 171International Journal of Plastics Technology9, No.1-2, 2005, p.539CROSSLINKED POLY(VINYL ALCOHOL)(PVA) MEMBRANES WITH PHOSPhom*oLYBDIC ACID(PMA) FOR DIRECT METHANOL FUEL CELLSAnis A; Banthia A K

A composite membrane based on crosslinked PVAl and phosphom*olybdic acid was prepared and its proton conductivity and methanol diffusivity were studied. The highest proton conductivity of 0.0101 S/cm was measured at room temperature. A diffusion cell was constructed and used to evaluate the methanol diffusivity of these composite electrolyte membranes in an aqueous methanol solution of 50% v/v. The methanol diffusion coefficients for these composite membranes ranged from 2.11 x 10-7 to 3.1 x 10-6 cm2/s. 13 refs.

References and Abstracts

Indian Institute of TechnologyINDIA

Accession no. 972168

Item 172ACS Polymeric Materials: Science and Engineering, Fall Meeting 93, 2005, p.1037CUTINASES CATALYZE THE DEACETYLATION OF POLYVINYL ACETATERonkvist A; Shah V; Kudasheva D; Gross R

The use of two different cutinises as enzymatic catalysts in the deacetylation of polyvinyl acetate deposited on silica beads was evaluated using nuclear magnetic resonance spectroscopy to determine the percentage deacetylation. The effect of the pH of the aqueous medium on the cutinise activity was examined. Up to 60 percent deacetylation was achieved within 24 hours and enzyme catalysis was proven. 10 refs.USA

Accession no. 971621

Item 173ACS Polymeric Materials: Science and Engineering, Fall Meeting 93, 2005, p.981MULTILAYER FABRICATION USING HYDROPHOBIC INTERACTIONSShaw J K; Hsu L; McCarthy T J

Multilayer assembly of polyvinyl alcohol (PVOH) on a hydrophobic surface by chemical modification of a PVOH layer followed by hydrophobic interaction with unmodified PVOH was demonstrated. Reaction of the hydroxyl groups in the surface layer of PVOH with heptafluorobutyryl chloride resulted in making the polymer hydrophobic. Surfaces were characterised by X-ray photoelectron spectroscopy atomic force microscopy ellipsometry and contact angle measurements. Coatings up to several nanometers thickness could be obtained in a controlled manner using this technique. 14 refs.USA

Accession no. 971592

Item 174ACS Polymeric Materials: Science and Engineering, Fall Meeting 93, 2005, p.771TRIBOLOGY STUDY OF PVA CONTACT LENS IN IONIC AQUEOUS ENVIRONMENTSJinping Dong; Haugstad G D

The surface mechanical behaviour of daily disposable PVAl contact lenses in ionic aqueous environments was investigated by scanning probe microscopy. Friction force images at particular loads were acquired and analysed as histograms to obtain a spectroscopic lineshape of friction

comparable between saline types. Surface roughness adhesion and stiffness values extracted from volume spectroscopy measurements recorded under different conditions were also obtained and the surface behaviour of the lenses in different saline conditions compared. 6 refs.USA

Accession no. 970774

Item 175Journal of Polymer Science: Polymer Physics Edition44, No.13, 2006, p.1813EFFECT OF POLY(VINYL ALCOHOL) FINE PARTICLES AS A NOVEL BIODEGRADABLE NUCLEATING AGENT ON THE CRYSTALLIZATION OF POLY(3-HYDROXYBUTYRATE)Alata H; Hexig B; Inoue Y

The effects of fine particles of poly(vinyl alcohol)(PVA) as biodegradable nucleating agent on the crystallisation of bacterial poly(3-hydroxybutyrate) (PHB) were investigated using DSC WAXD and polarised optical microscopy. The results are discussed in comparison with the crystallisation of blends of PVA with PHB and with the effects of conventional non-biodegradable nucleating agents such as talc. 30 refs.

Tokyo Institute of TechnologyJAPAN

Accession no. 970627

Item 176ACS Polymeric Materials: Science and Engineering, Fall Meeting 93, 2005, p.619PHOTOLUMINESCENCE STUDIES OF TIN OXIDE NANOFIBERS PREPARED BY ELECTROSPINNINGHak-Yong Kim; Nallasamy D; Kwan-Woo Kim; Myung-Seob Khil; Chi-Hun Kim

Calcination of a composite of polyvinyl acetate and tin oxide nanofibres prepared by electrospinning resulted in pure tin oxide nanofibres. These pure nanofibres were characterised by scanning electron microscopy tapping mode atomic force microscopy X-ray diffraction Raman spectroscopy and room temperature photoluminescence spectroscopy. Fibre diameter was seen to shrink during calcinations and photoluminescence emission decreased with increasing calcinations temperatures. These observations were discussed. 4 refs.INDIA; SOUTH KOREA

Accession no. 969631

Item 177Polymer Testing25, No.3, 2006, p.377

References and Abstracts

ADDITION OF METHACRYLOYL GROUPS TO POLY(VINYL ALCOHOL) IN DMSO CATALYZED BY TEMED: OPTIMIZATION THROUGH RESPONSE SURFACE METHODOLOGYCrispim E G; Piai J F; Rubira A F; Muniz E C

The addition of methacryloyl groups from glycidyl methacrylate (GMA) to poly(vinyl alcohol) PVA was investigated in the former paper of this series. In this report this reaction was optimized by response surface methodology (RSM). In the first step the main and the interaction effects of reaction time temperature and environment (either room atmosphere or N2 bubbling) on the degree of substitution (DS) were investigated through a 23 factorial design and by keeping the feed solution molar ratio (-OH(PVA)/GMA) equal to 1/0.05. DS was calculated from the respective 1H NMR spectrum. The results showed that the reaction time and temperature inputs are significant (P= less than 0.05) for the incorporation of methacryloyl groups into PVA chains. In the second step maximum DS was achieved by the use of RSM at 62 deg.C and reaction time of 6h. In these optimized conditions molar ratios (-OH(PVA)/GMA) equal to 1/0.10 1/0.25 1/0.50 1/0.75 and 1/1 were investigated and the respective yield ranged from 91 to 93% when DS was up to 25 mol%. It is difficult to obtain more than 50 mol% substitution of PVA hydroxyl by methacryloyl groups even in these optimized conditions due to increased steric hindrance by the large number of the methacryloyl groups inserted into PVA. The response surface was based on the model DS=-19.70+6.09x10-1T+1.93t-3.89x10-3T2-5.21x10-2t2-2.14x10-2T*t where T is the temperature ( deg.C) and t the reaction time (hours). This model explained 99.2 of the 99.6% explainable statistical data. 22 refs.

Maringa Universidade EstadualBRAZIL

Accession no. 969434

Item 178Polymer Degradation and Stability91, No.5, 2006, p.1192THERMAL AND PHOTOCHEMICAL STABILITY OF POLY(VINYL ALCOHOL)/MODIFIED LIGNIN BLENDSFernandes D M; Winkler Hechenleitner A A; Job A E; Radovanocic E; Gomez Pineda E A

A kraft lignin derivative (KLD) obtained by reaction with p-aminobenzoic acid/phthalic anhydride was blended with poly(vinyl alcohol) (PVA) by solution casting from DMSO. PVA and PVA/KLD films were exposed to ultraviolet radiation (24, 48 and 96 h) and analyzed by thermogravimetry (TG) differential scanning calorimetry (DSC) infrared spectroscopy (FTIR) hydrogen nuclear magnetic resonance (1H-NMR) spectroscopy and scanning electron microscopy (SEM). PVA films show a loss of thermal stability due to irradiation. PVA/KLD reveals greater thermal stability than PVA and an increase in thermal stability after irradiation. These results suggest

that the incorporation of KLD into PVA provides a gain in thermal and photochemical stability. FTIR 1H NMR DSC and TG results obtained for the blends suggest that intermolecular interactions between PVA and KLD chains are present. SEM micrographs revealed blend miscibility for a KLD blend content of up to 15 wt% as observed at magnification of 1000 times. 20 refs. Copyright (c) 2006 Elsevier Ltd.

Maringa Universidade Estadual; Paulista Universidade EstadualBRAZIL

Accession no. 969400

Item 179Polymer Degradation and Stability91, No.5, 2006, p.1147FOAMED ARTICLES BASED ON POTATO STARCH CORN FIBERS AND POLY(VINYL ALCOHOL)Cinelli P; Chiellini E; Lawton J W; Imam S H

Single-use packaging materials made of expanded polystyrene (EPS) have been identified as suitable items to be replaced by biodegradable materials. Plates made with EPS represent a source of non-degradable waste that is difficult to collect and to recycle. Potato starch based foamed plates have been prepared by a baking process. Presently foam plates have been prepared by baking aqueous mixtures of potato starch corn fibres and poly(vinyl alcohol) (PVA) inside a hot mould. The effects of the addition of corn fibres a co-product of bio-ethanol production on mechanical properties and moisture resistance of potato starch based foamed plates were investigated. The addition of corn fibre to potato starch batter increased baking time and an increased batter volume is needed to form a complete tray. The mechanical properties of the trays decreased with added corn fibre. In previous studies PVA has been added as aqueous solution to improve strength flexibility and water resistance of baked starch trays. In this study 88% hydrolyzed PVA was added as a powder in the mixture avoiding the time consuming and costly step of pre-dissolving the PVA. The addition of PVA to potato starch batters containing corn fibre mitigated the reduction in tensile properties seen in trays with added corn fibre. Starch-based trays produced with a high fibre ratio and PVA showed improved water resistance. 27 refs.

Pisa University; US Dept. of AgricultureEUROPEAN COMMUNITY; EUROPEAN UNION; ITALY; USA; WESTERN EUROPE

Accession no. 969396

Item 180Polymer Plastics Technology and Engineering45, No.1-3, 2006, p.341SYNTHESIS CHARACTERIZATION AND APPLICATION OF POLY(ACRYLAMIDE)/POLY(VINYL ALCOHOL) POLYBLENDS

References and Abstracts

Ibrahim N A; Hebeish A; Fahmy H M; Abo-Shosha M H

Free radical polymerisation of acrylamide(Aam) in the presence of aqueous solutions of three commercial grades of PVAl i.e. Vinarol FV (containing very few acetyl groups) Mowiol 4-80 (low viscosity-partially hydrolysed) and Vinarol STH (medium viscosity-partially hydrolysed) using ammonium persulphate(AP) initiator was shown to result in three corresponding PVAl/Aam polyblends. Optimum polymerisation conditions were PVAl and AP concentrations of 10% and 0.05 mol/L respectively Aam concentration 50% based on the weight of PVA polymerisation temperature 70C polymerisation time 20 min and rate of stirring 200 rpm. Under these conditions the three polyblends were prepared at very high degrees of polymerisation ranging from 98.2 to 99.9%. Rheological properties of 10% aqueous solutions of the polyblends at 80C were studied. The extent of film resolubility of PVAls and their polyblends was determined. Sizing of gauzy cotton fabric with the polyblends and PVAls was studied with reference to tensile properties and desizability. 47 refs.

Egypt National Research CentreEGYPT

Accession no. 969122

Item 181Polymer Plastics Technology and Engineering45, No.1-3, 2006, p.213EFFECT OF ACCELERATED AGING ON PROPERTIES OF KENAF (HIBISCUS CANNABINUS) PAPER SIZED WITH VARIOUS POLYMERSAshori A; Harun J; Raverty W D; Yusoff M N M

The effect of ageing on the properties of paper sized with chitosan cationic starch and PVA was investigated under accelerated conditions (90C and 50% RH). The results of this study demonstrated that the brightness and pH of papers decreased with an increase in ageing time. At each ageing time paper sized with chitosan showed the highest reduction in brightness whereas decreases in brightness in papers sized with PVA and cationic starch did not show much difference. The results demonstrated that paper sized with any of the polymers gave higher levels of tear index tensile index and folding endurance than the control sheet. Statistical analysis indicated that the polymers used in this experiment had a statistically-significant effect on the folding endurance of sized paper that was highest in the cases of PVA and chitosan. 12 refs.

Iranian Research Organization of Science & Technology; Commonwealth Scientific & Industrial Research Organisation; Putra Malaysia Universiti; Forest Research Institute of MalaysiaAUSTRALIA; IRAN; MALAYSIA

Accession no. 969106

Item 182Designed Monomers and Polymers9, NO.3, 2006, P.303SYNTHESIS OF ULTRA-HIGH-MOLECULAR-WEIGHT PVA USING TWO-STAGE PHOTO-CONCENTRATED EMULSION POLYMERIZATION OF VINYL ACETATELin C-A; Wu C-R; Tsai H-C

The synthesis of ultra-high molecular weight poly(vinyl alcohol) by a two-stage photo-concentrated emulsion polymerisation of vinyl acetate in the presence of poly(oxyethylene) nonyl phenyl ether sodium sulphate as emulsifier and in the absence of initiators followed by hydrolysis is described. The polymer was characterised by proton NMR and degree of polymerisation and the results are discussed in comparison with those for the products of emulsion polymerisation carried out in the presence of potassium persulphate as initiator. 17 refs.

Taiwan Feng Chia UniversityTAIWAN

Accession no. 968491

Item 183Polymer Degradation and Stability91, No.8, 2006, p.1740THE NEGATIVE BIODEGRADATION OF POLY(VINYL ALCOHOL) MODIFIED BY ALDEHYDESHui Zhen Zhang; Bai Ling Liu; Rong Luo; Yongzhong Wu; Desong Lei

Due to the wide application of PVA acetals the biodegradation of PVA modified by formaldehyde n-butyraldehyde glyoxaldehyde and glutaraldehyde was conducted in an intensive biodegradation environment. Spectrophotometric analysis and weight loss were used to determine the biodegradation of PVA and the changes of the mechanical properties of PVA acetals were also studied. An obvious decrease in biodegradation levels of all the modified samples was found and a decrease in biodegradation level with increasing degree of acetals of PVA. The biodegradation of poly(vinyl formal) is better than poly(vinyl butyral) with the same degree of acetals whereas the biodegradation levels of poly(vinyl glyoxal) are lower than poly(vinyl glutaral) which has the same degree of crosslinking. The difference between the FT-IR of the samples before and after biodegradation indicated scission of residual PVA chain during the process. 30 refs.

Chinese Academy of SciencesCHINA

Accession no. 968361

Item 184Analytica Chimica Acta566, No.1, 2006, p.271NOVEL NANOSTRUCTURED MATERIALS TO

References and Abstracts

DEVELOP OXYGEN-SENSITIVE FILMS FOR OPTICAL SENSORSFernandez-Sanchez J F; Cannas R; Spichiger S; Steiger R; Spichiger-Keller U E

The development of optical oxygen-sensitive sensors by incorporation of organometallic compounds into a matrix of poly(vinyl acetate) containing nanostructured materials such as aluminium oxide silicon oxide or zirconium oxide was investigated. The photostability and the effects of sterilisation by autoclaving and gamma irradiation on the performance of the optodes are discussed in comparison with other types of oxygen sensors.

Granada University; ETH ZurichEUROPEAN COMMUNITY; EUROPEAN UNION; SPAIN; SWITZERLAND; WESTERN EUROPE

Accession no. 967740

Item 185Polymer47, No.4, 2006, p.1324HIGHLY ISOTACTIC POLY(VINYL ALCOHOL) DERIVED FROM TERT-BUTYL VINYL ETHER. PART IV. SOME PHYSICAL PROPERTIES STRUCTURE AND HYDROGEN BONDING OF HIGHLY ISOTACTIC POLY(VINYL ALCOHOL) FILMSOhgi H; Sato T; Hu S; Horii F

Fundamental physical properties of films of various stereoregular poly(vinyl alcohol) samples including highly isotactic PVA (HI-PVA) derived from tert-butyl vinyl ether were examined. The melting temperature degree of crystallinity and carbon-13 spin-lattice relaxation time of the crystalline component showed and distinct minima at an mm fraction of about 0.4-0.5 suggesting that structural disordering associated with the decrease in crystallinity may be most strongly induced at this mm fraction. The formation of a new crystal form of PVA was reconfirmed for HI-PVA samples with mm fractions of more than about 0.55 and the structure and hydrogen bonding were investigated in detail by solid-state carbon-13 NMR. All OH groups can form successive intramolecular hydrogen bonds along their respective chains in the crystalline region for HI-PVA samples with mm fractions of more than about 0.7. These chains may adopt a slightly helical structure with a very long period. The appearance of minima in physical values may be related to the introduction of disordered units mainly as a result of hydrogen bonding to syndiotactic or isotactic sequences. 43 refs.

Kuraray Co.Ltd.; Kyoto UniversityJAPAN

Accession no. 967514

Item 186Polymer47, No.4, 2006, p.1308

MORPHOLOGY AND MECHANICAL AND ELECTRICAL PROPERTIES OF ORIENTED PVA-VGCF AND PVA-MWNT COMPOSITESBin Y; Mine M; Koganemaru A; Jiang X; Matsuo M

Composites of poly(vinyl alcohol) (PVA) with vapour-grown carbon fibres (VGCFs) and multi-wall carbon nanotubes (MWNTs) were prepared by gelation/crystallisation from aqueous dimethyl sulphoxide. The composite films were uniaxially elongated to five- to ten-fold. The mechanical properties of PVA composites were improved significantly as a result of the introduction of VGCFs and MWNTs and by the orientation of the fillers. Because of their network structure MWNTs were more effective than VGCFs in improving the electrical conductivity of the composites. The change in the electrical conductivity of PVA/MWNT composites containing 5 wt% of MWNTs was independent of the draw ratio up to eight-fold indicating that there was no disruption of network formation. 26 refs.

Nara Women's UniversityJAPAN

Accession no. 967512

Item 187Polymer47, No.4, 2006, p.1073SYNTHESIS OF POLY(VINYL ALCOHOL) COMBS VIA MADIX/RAFT POLYMERIZATIONBernard J; Favier A; Davis T P; Barner-Kowollik C; Stenzel M H

Poly(vinyl acetate) (PVAc) combs were prepared by xanthate (MADIX)/reversible addition-fragmentation chain-transfer (RAFT) polymerisation using xanthate-functionalised polymer cores. The comb backbones were prepared by using well-defined poly(vinyl alcohol) samples with degrees of polymerisation of 20 100 and 170. Functionalisation with xanthates through the R-group or Z-group approaches resulted in the formation of macromolecular MADIX agents. Whereas Z-group-containing macromolecular xanthate agents appeared to inhibit the polymerisation of vinyl acetate R-group-containing agents effectively mediated the bulk polymerisation of VAc to give PVAc combs. However the growth of the combs was accompanied at low conversions by the formation of linear polymer chains and shoulders as a result of the constant initiation and intermolecular coupling reactions respectively. The proportions of single chains and termination products increased with increasing degree of polymerisation of the macromolecular MADIX agents. The stable ester link between the branches and the PVA backbone permitted the branched PVAc architectures to be hydrolyzed to give poly(vinyl alcohol) combs. 35 refs.

New South Wales UniversityAUSTRALIA

Accession no. 967487

References and Abstracts

Item 188Macromolecules39, No.8, 2006, p.2921SAXS STUDIES ON STRUCTURAL CHANGES IN A POLY(VINYL ALCOHOL) FILM DURING UNIAXIAL STRETCHING IN WATERMiyazaki T; Hoshiko A; Akasaka M; Shintani T; Sakurai S

Structural changes in a poly(vinyl alcohol) (PVA) film during uniaxial stretching in water were examined by simultaneous tensile stress-strain measurements and small-angle X-ray scattering (SAXS) studies. At strains of less than 70% the crystalline lamellae orient in the direction perpendicular to the stretching direction and the intervening amorphous regions are elastically expanded with film drawing in proportion to the macroscopic deformation. At strains of more than 70% the molecular chains in the intermediate amorphous region are relaxed with lamellar break-up. Above 180% strain a structural transition of the lamellar structure to a microfibrillar structure occurs as suggested by the appearance of a transversal streak with an intensity maximum on each streak and a mechanical transition. In the final stage of deformation there is networking with a long-range connectivity composed of the microfibrils and the interfibrillar extended amorphous chains. The network of the interfibrillar extended amorphous region is considered to lead to strain-induced hardening which occurs at strains from 180% up to the break. 45 refs.

Nitto Denko Corp.; KyotoInstitute of TechnologyJAPAN

Accession no. 966401

Item 189Journal of Applied Polymer Science100, No.3, 2006, p.2409PREPARATION OF POLYSTYRENE/POLY(VINYL ACETATE) NANOCOMPOSITES WITH A CORE-SHELL STRUCTURE VIA EMULSIFIER-FREE EMULSION POLYMERIZATIONSoltan-Dehghan M; Sharifi-Sanlani N; Naderi N

Nanoparticles with a core-shell morphology were prepared by using a two-stage emulsifier-free emulsion polymerisation of styrene and vinyl acetate using azo bisaminopropane dihydrochloride as both initiator and emulsifier. The resulting latex particles were characterised using scanning electron microscopy transmission electron microscopy and differential scanning calorimetry. Effects of different volume ratios of monomers reaction time and monomer addition method to the reaction medium were evaluated. 18 refs.

Tehran UniversityIRAN

Accession no. 965894

Item 190Journal of Polymer Science: Polymer Chemistry Edition44, No.9, 2006, p.3083COPOLYMERIZATION OF POLY(VINYL ALCOHOL)-GRAFT-POLY(14-DIOXAN-2-ONE) WITH DESIGNATED MOLECULAR STRUCTURE BY A SOLID-STATE POLYMERIZATION METHODSi-Chong Chen; Xiu-Li Wang; Ke-Ke Yang; Gang Wu; Yu-Zhong Wang

The solid state copolymerisation of poly(vinyl alcohol)-g-poly(14-dioxan-2-one) with designed molecular structure is described. The solid state copolymerisation is preceded by a higher temperature graft copolymerisation of poly(14-dioxan-2-one) with PVA as a multifunctional initiator. Polymers are characterised by NMR spectroscopy and DSC and compared with those synthesised in the hom*ogeneous molten state. 34 refs.

Sichuan UniversityCHINA

Accession no. 965341

Item 191Materials Science and Engineering21, No.6, 2005, p.77SYNTHESIS AND CHARACTERIZATION OF PVA SIDE-CHAIN LIQUID CRYSTALLINEJiu-Fen Wang; Hong-Yan Xu; Li Chang

The synthesis of a side-chain liquid crystalline PVAl using PVAl as electron donor and 4-stibazole as electron acceptor through molecular recognition is described. The thermotropic liquid crystalline behaviour phase transition temperature and flexibility of the liquid crystalline PVAl are discussed and the relationship between the liquid crystalline group and polymer backbone examined. 9 refs.

North China Institute of Technology PolymerCHINA

Accession no. 964609

Item 192Macromolecules39, No.5, 2006, p.1709POLY(VINYL ALCOHOL)-BASED HYDROGELS FORMED BY CLICK CHEMISTRYOssipov D A; Hilborn J

Poly(vinyl alcohol) (PVA) was functionalised with pendant acetylene and azide groups by carbonyldiimidazole-mediated coupling with amines terminated with functional groups (1-azido-2-aminoethane propargylamine and N-methylpropargylamine). Azide-modified PVA and alkyne-modified PVA crosslinked when mixed in solution with Cu(I) catalyst. Chemoselective coupling between the functional groups resulted in multiple crosslinking and hydrogel formation. PVA-based hydrogels were

References and Abstracts

also prepared by crosslinking alkyne-modified PVA with telechelic bifunctional poly(ethylene glycol)-diazide crosslinker. The hydrogels were characterised by measurements of swelling in water viscoelastic properties in the swollen state and of the soluble fraction. The network properties were crosslinking-dependent. The use of polyfunctional PVA crosslinkers gave higher gelation capacity than the bifunctional PEG crosslinker. 50 refs.

Uppsala UniversityEUROPEAN UNION; SCANDINAVIA; SWEDEN; WESTERN EUROPE

Accession no. 964470

Item 193CSIC Revista de Plasticos Modernos91, No.596, 2006, p.153PVA CRYOGELS; MECHANISMS FOR FORMATION STRUCTURE AND APPLICATIONSHernandez R; Lopez D; Mijangos C

A review is presented on the structure and applications particularly biomedical applications of PVAl cryogels and the preparation and characterisation of PVAl/gamma-cyclodextrin inclusion compounds and their influence on PVAl gelation by freeze-thawing. 50 refs.

EUROPEAN COMMUNITY; EUROPEAN UNION; SPAIN; WESTERN EUROPEAccession no. 963997

Item 194Journal of Applied Polymer Science99, No.5, 2006, p.2233MECHANISM OF AIR/OXYGEN/HELIUM ATMOSPHERIC PLASMA ACTION ON PVACai Z; Qiu Y

The effect of the air/oxygen/helium atmospheric plasma treatment on desizing PVAL on cotton fabric is discussed and compared with the conventional peroxide desizing. Possible changes of PVAL during atmospheric plasma exposure was induced through a combination of weight loss of PVAL after plasma PVAL dissolving rate in water at room temperature X-ray photoelectron spectroscopy and FTIR. 15 refs.

Donghua UniversityCHINA

Accession no. 963889

Item 195Macromolecules39, No.3, 2006, p.1160INFLUENCES OF INTRAMOLECULAR CYCLIZATION ON STRUCTURE AND CROSS-LINKING REACTION PROCESSES OF PVA HYDROGELSDacheng Zhao; Guangzhi Liao; Ge Gao; Fengqi Liu

Preparation of polyvinyl alcohol (PVAlc) hydrogels

in solutions of different concentrations and using glutaraldehyde as crosslinking agent was studied by measurement of intrinsic viscosity of PVAlc solutions determination of gel fraction and by gel swelling measurements. Effects of intramolecular cyclisation were calculated according to the molecular tree model. Gel growth was controlled by polymer concentration with no bulk gels formed below a particular concentration. Equilibrium swelling ratio reduces as polymer concentration increases. 25 refs.

Jilin University; Petro China Co.Ltd.CHINA

Accession no. 961989

Item 196China Chemical Reporter17, No.4-5, 2006, p.17NEW HYDROPHILIC PRESSURE-SENSITIVE ADHESIVE

It is briefly reported that Tianjin University Chemical Industry School has developed a new gel-type pressure-sensitive adhesive used in skin drug application systems. The hydrophilic PSA has good adhesion and low sensitisation and irritation. It has good compatibility with extracts and micro powders of traditional Chinese medicines. The PSA gels developed include PVP/PEG/gelatin PVP/polyester/glycerin and PVP/PVA/glycerin varieties.

Tianjin UniversityCHINA

Accession no. 960276

Item 197Polymers and Polymer Composites14, No.1, 2006, p.39RELEASE BEHAVIOUR OF BOVINE SERUM ALBUMIN IN SYNDIOTACTIC POLY(VINYL ALCOHOL) HYDROGEL PREPARED BY FREEZING-THAWINGWon Seok Lyoo; Dong Soo Shin; Sung Soo Han; Seok Kyun Noh; Jung Ae Kim; Han Gon Choi; Chul Soon Yong; Jae-Ryong Kim; Jung Hye Kim

The release behaviour of bovine serum albumin (BSA) in syndiotactic polyvinyl alcohol (PVA) hydrogels was studied with respect to the effect of some molecular parameters. The hydrogels were prepared by freezing-thawing. Various syndiotactic PVAs were prepared by copolymerisation of vinyl pivalate and vinyl acetate and subsequent saponification. The effect on the release rate of factors such as stereoregularity degree of saponification and molecular weight of the syndiotacticity-rich PVA hydrogels was studied. Both the release rate and the amount of residual BSA was investigated with varying degrees of syndiotacticity. It was found that s-PVA hydrogels having various kinds of release behaviours could be prepared by control of the molecular and processing

References and Abstracts

parameters of PVA and these could be successfully used in various biomedical applications. 23 refs.

Yeungnam UniversityKOREA

Accession no. 958892

Item 198Macromolecules38, No.23, 2005, p.9488SYNTHESIS OF POLY(VINYL ACETATE) AND POLY(VINYL ALCOHOL) CONTAINING BLOCK COPOLYMERS BY COMBINATION OF COBALT-MEDIATED RADICAL POLYMERIZATION AND ATRPDebuigne A; Caille J; Willet N; Jerome R

Poly(vinyl acetate) (PVAc) chains of a low polydispersity (Mw/Mn = 1.1-1.2) were prepared by cobalt-mediated radical polymerisation of vinyl acetate (VAc). The polymers were end-capped by an activated bromide by the addition of an alpha-bromo ester or an alpha-bromo ketone containing a nitroxide to form effective macroinitiators for the atom-transfer radical polymerisation of styrene (S) ethyl acrylate or methyl methacrylate. Because each block is formed by a controlled process well-defined PVAc-containing diblock copolymers can be readily prepared. The PVAc-b-PS copolymers synthesised from alpha-bromo ketone end-capped PVAc can be converted into well-defined poly(vinyl alcohol)-b-polystyrene amphiphiles by methanolysis of the poly(vinyl acetate) block. Self-association of an amphiphilic poly(vinyl alcohol)-b-polystyrene in a water/tetrahydrofuran mixture results in the formation of vesicles. 22 refs.

Solvay Research & Technology; Liege UniversityBELGIUM; EU; EUROPEAN COMMUNITY; EUROPEAN UNION; WESTERN EUROPE; WESTERN EUROPE-GENERAL

Accession no. 957899

Item 199Polymers and Polymer Composites13, No.8, 2005, p.839PREPARATION AND CHARACTERIZATION OF NI+-MONTMORILLONITE/POLYVINYL ALCOHOL WATER-SOLUBLE NANOCOMPOSITE FILMLi-Ping Wang; Yun-Pu Wang; Fa-Ai Zhang

This paper describes the preparation of a new type of water-soluble nanocomposite film from polyvinyl alcohol Ni+2montmorillonite (Ni+2MMT) a defoaming agent a levelling agent and a plasticiser. Its thermal characteristics were studied by DSC and the intermolecular interactions were measured by FTIR and XPS. The tensile strength and elongation at break were also measured. The microstructures were studied by XRD and AFM. FTIR and XPS spectra indicated that crosslinking had taken place between PVA and Ni+2MMT. XRD and AFM indicated that the PVA molecules

had inserted themselves into the silicate layers of MMT exfoliating them and dispersing them randomly into the PVA matrix. Compared to pure PVA film the tensile strength of the films increased and the elongation at break decreased when the Ni+2MMT was added and the dissolution temperature of the film was also reduced. 23 refs.

Lanzhou Northwest Normal University; Guilin University of TechnologyCHINA

Accession no. 956570

Item 200China Synthetic Fiber Industry28, No.5, 2005, p.1/7STUDY ON SUPERABSORBENT BLEND FIBER OF COPOLY(ACRYLIC ACID-ACRYLAMIDE) AND PVADing Yuanrong; Xiao Changfa; An Shulin; Jia Guangxia

2-Hydroxypropyl acrylate a potential crosslinking agent was incorporated into an acrylic acid-acrylamide copolymer which was blended with PVAl and spun into fibres. The water absorption behaviour of the fibres following post-curing was investigated and the effects of post-curing on the structure and properties of the fibres investigated. 6 refs.

Tianjin Polytechnic UniversityCHINA

Accession no. 955290

Item 201Journal of Applied Polymer Science98, No.5, 2005, p.2290BIOCOMPATIBLE POLYMER BLENDS: EFFECTS OF PHYSICAL PROCESSING ON THE MOLECULAR INTERACTION OF POLY(VINYL ALCOHOL) AND POLY(VINYL PYRROLIDONE)Jones S A; Martin G P; Royall P G; Brown M B

The rapid removal of a solvent by spray drying of partially hydrolysed poly(vinyl alcohol) (PVA)/poly(vinyl pyrrolidone) (PVP) altered the solid-state properties of the material compared with the case of casting the blend to form a film. Although thermal analysis showed that PVP functions as a plasticiser (reducing the melting point of PVA) spray drying the product rather than using a film-casting procedure improved its solid-state stability and resulted in the formation of a second crystalline phase within the material. Variations in the solid-state properties of manufactured PVA/PVP blends arose from structural differences in the composite produced by differences in the processing method used to form the blend. The solid-state properties of blended products can be altered by careful manipulation of the manufacturing process. 35 refs.

London University King's CollegeEUROPEAN COMMUNITY; EUROPEAN UNION; UK; WESTERN EUROPE

Accession no. 954815

References and Abstracts

Item 202China Chemical Reporter16, No.32, 2005, p.23POLYMER EMULSION ADHESIVES ENTER SOUND DEVELOPMENT STAGEBeifan G

The annual output growth of polymer emulsion adhesives in China was 20% from 2001 to 2004 the highest level in the world. Output in China was 1.483 million tons in 2004 an increase of 16.6% over 2003. It is expected that the annual output growth will be 12-15% reaching 3.0 million tons in 2010. Polymer emulsion adhesives include polyacrylate emulsion polyvinyl acetate emulsion vinyl acetate-ethylene copolymer emulsion and PU emulsion. Output of these major polymer emulsion adhesives in China is outlined.CHINA

Accession no. 954715

Item 203Polymer46, No.21, 2005, p.9170MISCIBILITY AND INTERACTIONS IN POLY(N-PROPYL METHACRYLATE)/POLY(VINYL ALCOHOL) BLENDSYi J Z; Goh S H

Blends of poly(propyl methacrylate) (PPMA) and poly(vinyl alcohol) (PVA) were prepared over the whole composition range by mixing DMF solutions of each polymer and evaporating the mixture to dryness. The blends were characterised by DSC FTIR and high-resolution solid-state carbon-13C-NMR using CP/MAS experiments. All blends were transparent and showed a single glass transition temperature indicating complete miscibility. The spectral changes upon blending indicated that the PVA hydroxyl groups were interacting with the PPMA carbonyl groups. The blends were hom*ogeneous on a scale of 20-30 nm but not 1-3 nm. The results were discussed in relation to published work for PVA and poly(p-vinylphenol) blends with poly(methylthiomethyl methacrylate) and the influence of the sulphur atom. 29 refs.

Sun Yat-Sen University; Singapore National UniversityCHINA; SINGAPORE

Accession no. 954174

Item 204Journal of Applied Polymer Science98, No.6, 2005, p.2339DEVELOPMENT OF POTENTIALLY BIODEGRADABLE POLYAMIDE-6 AND POLYVINYL ALCOHOL BLENDS: PHYSICO-MECHANICAL PROPERTIES THERMAL PROPERTIES AND SOIL TESTRamaraj B; Poomalai P

Different blends of polyamide-6 with polyvinyl alcohol (PVA) are prepared in a twin-screw extruder and the extrudate injection moulded to make test specimens. The biodegradation properties are evaluated. In soil tests all blends show enhanced biodegradability water absorption and density. However introduction of PVA into the polyamide-6 matrix gives considerable reduction in tensile strength heat distortion temperature vicat softening point and hardness initially but this reduction is absent on subsequent addition because of the enhanced interaction between amide and hydroxyl groups. 34 refs.

Central Institute of Plastics Engineering & TechnologyINDIA

Accession no. 953666

Item 205International Polymer Science and Technology32, No.6, 2005, p.T/42-4CALORIMETRIC STUDY OF BLENDS BASED ON POLYVINYL ALCOHOL AND POLYHYDROXYBUTYRATEOl'khov A A; Iordanskii A L; Fel'dshtein M M

A calorimetric study is described of blends based on polyhydroxybutyrate (PHB) and polyvinyl alcohol (PVA). The polymers were mixed in PVA/PHB ratios (wt%) of 90:10 80:20 70:30 and 50:50. Films were produced from the blends by extrusion of the melt through a plane slit head using a single-screw extruder. Calorimetric studies of the films were carried out using a differential scanning calorimeter. It was seen that films based on PVA were characterised by the presence of two types of crystal structure and one glass transition. In composites based on PVA and PHB the same picture is observed but the melting peak of the crystalline phase of PHB is superimposed on the high-temperature peak of melting of the PVA. It was concluded that the components of the blends were partially compatible indicated by an increase in the Tg and a reduction in the specific heat of the PVA phase. Other conclusions reached were that the degree of crystallinity of the PVA falls considerably with an increase in the PHB content of the blend and that the parameters of the crystallites in the mixed polymers hardly change as a function of the composition of the composites. 10 refs. (Article translated from Plasticheskie Massy No.10 2004 p.25-6)

Lomonosov M.V.Academy of Fine Chemical Technology; Russian Academy of SciencesRUSSIA

Accession no. 953438

Item 206Proceedings of the 63rd SPE Annual conference (ANTEC 2005) held Boston, MApp.5EFFECT OF NANOCLAY ON EFFICIENCY OF LOW PROFILE ADDITIVES (LPAS) ON

References and Abstracts

SHRINKAGE CONTROL OF UNSATURATED POLYESTER (UP) RESINXia Cao; Lee L J

The addition of a small quantity of nanoclay (3 wt %) can greatly enhance the efficiency of low profile additives (LPAs) for volume shrinkage control of low profile unsaturated polyester(UP)/styrene/LPA systems. In this study the effect of nanoclay on volume shrinkage of low profile UP resins containing PS PMMA and PVAc respectively was investigated by an integrated approach of static phase characteristics of uncured resin mixture morphology of the cured samples reaction kinetics and shrinkage measurement. The results revealed that nanoclay greatly increased the fraction of LPA-rich phase leading to more micro-cracking in the LPA-rich phase or at the interface of the LPA-rich and UP-rich phases and therefore to a marked improvement of volume shrinkage control. The effects of structure/properties of LPAs and surface property of nanoclay on shrinkage of UP resin were also investigated. 14 refsUSA

Accession no. 953369

Item 207EP 1593726 A1 20051109WATER-BASED VULCANIZABLE ADHESIVE COMPOSITIONf*ckasawa K; Abe K

Disclosed is an aqueous vulcanisable adhesive composition which comprises a phenol resin emulsion prepared from a water-insoluble phenol resin solution in methyl ethyl ketone and an aqueous water-soluble polymeric substance solution and a curing agent for the phenol resin. It uses a partially water-miscible methyl ethyl ketone in place of a completely water-miscible organic solvent. PVA preferably aceto-acetyl-modified PVA is used as the water-soluble polymeric substance. The adhesive composition is suitably used for vulcanisation bonding of a metal to (hydrogenated) NBR or acrylic rubber.

Accession no. 953008

Item 208Macromolecular Research13, No.5, 2005, p.385CHARACTERIZATION OF PVOH NONWOVEN MATS PREPARED FROM SURFACTANT-POLYMER SYSTEM VIA ELECTROSPINNINGJung Y H; Kim H Y; Lee D R; Park S Y; Khil M Y

The fabrication of poly(vinyl alcohol) non-woven mats by electrospinning polymer solutions containing various concentrations of cationic anionic amphoteric and non-ionic surfactants characterised by surface tension viscosity and conductivity was investigated by SEM tensile strength and elongation at break measurements. The effects of polymer-surfactant interactions on the morphological

and mechanical properties of the non-woven mats are discussed. 23 refs.

Chonbuk National UniversityKOREA

Accession no. 952902

Item 209Journal of Macromolecular Science BB44, No.5, 2005, p.779PREPARATION AND PHYSICAL PROPERTIES OF CARBON NANOTUBES-PVA NANOCOMPOSITESCiambelli P; Sarno M; Gorrasi G; Sannino D; Tortora M; Vittoria V

The preparation of nanocomposites of poly(vinyl alcohol)(PVA) with various proportions of oxidised multiwall carbon nanotubes (MWNTs) under different processing conditions and their characterisation by FESEM TEM DSC TGA FTIR Raman spectroscopy and DMTA is described. The results were compared with those for PVA itself and the effects of MWNTs on structural mechanical and thermal properties are discussed. 53 refs.

Salerno UniversityEU; EUROPEAN COMMUNITY; EUROPEAN UNION; ITALY;

WESTERN EUROPE; WESTERN EUROPE-GENERAL

Accession no. 952824

Item 210E-Polymers24, No.72, 2005, p.1DRUG-LOADED ULTRAFINE POLY(VINYL ALCOHOL) FIBRE MATS PREPARED BY ELECTROSPINNINGChunxue Zhang; Xiaoyan Yuan; Lili Wu; Jing Sheng

The preparation of submicron polyvinyl alcohol (PVA) fibre mats embedded with Aspirin and bovine serum albumin from electrospun aqueous solutions is described. SEM is used to investigate the fibre morphology and the fibre mat composition is characterised by FTIR spectroscopy and X-ray photoelectron spectroscopy. The in vitro drug release is investigated by immersing the fibre mats in phosphate buffer solution. The fibre mat morphology is influenced by the amount of drug in the mats with more irregular shaped fibres found for higher drug content. The drugs are released more quickly from PVA mats than from PVA cast films because of the large surface area and high porosity of the fibres. 15 refs.

Tianjin UniversityCHINA

Accession no. 952706

Item 211Journal of Polymers and the Environment13, No.3, 2005, p.267

References and Abstracts

POLY(VINYL ALCOHOL)/COMPOST COMPOSITES FOR BIOFILTRATION OF SWINE WASTE VOLATILESWu-Chung Chan; Rui-Xiang Zheng

The preparation of a poly(vinyl alcohol) (PVA)/compost composite bead for biofiltration is reported. The composite bead is prepared by blending PVA with swine manure compost and fixing with boric acid and phosphate. The moisture absorption/holding capacity compressive strength nutrient content and density of the bead are characterised. The ethyl acetate removal efficiency pH and head loss of the composite bead and swine manure compost beds are also reported during biofilter operation. 18 refs.

Chung-Hua UniversityTAIWAN

Accession no. 951579

Item 212Journal of Polymers and the Environment13, No.3, 2005, p.253MOISTURE SORPTION CHARACTERISTICS OF MICROBIALLY PRODUCED POLYSACCHARIDE AND POLYVINYL ALCOHOL BLENDSSudhamani S R; Raj A E; Raj B; Prasad M S

The moisture sorption characteristics of microbial polysaccharide from Pseudomonas caryophilli and polyvinyl alcohol (PVA) blends are reported for water activity from 0.1 to 0.9 at 27C. The sorption data is used to fit six different sorption isotherm models. The ranges of applicability of water activity for isotherm models lie between 0.1 and 0.4 for a BET model and between 0.2 and 0.9 for other models. 28 refs.

India Central Food Technological Research Inst.INDIA

Accession no. 951577

Item 213Journal of Cellular Plastics41, No.5, 2005, p.437EFFECTS OF DIE SHAPES AND ADDITIVES ON THE PHYSICAL AND MECHANICAL PROPERTIES AND CELLULAR STRUCTURE OF BIODEGRADABLE CUSHIONING EXTRUDED FOAMSLui W-B; Peng J

The effects of die shape poly(vinyl alcohol)(PVA) ratio and additives (sodium bicarbonate calcium carbonate calcium hydroxide) on the physical mechanical and morphological properties of corn-PVA composite extruded foams were investigated by longitudinal expansion bulk density compressibility spring index and SEM. The experimental data was subjected to statistical analysis and the results are discussed. 37 refs.

Taiwan National Chung-Hsing UniversityTAIWAN

Accession no. 950853

Item 214Journal of Polymer Science: Polymer Physics Edition43, No.17, 2005, p.2399POLYMER-FILLER INTERACTIONS IN SOL-GEL DERIVED POLYMER/SILICA HYBRID NANOCOMPOSITESBandyopadhyay A; De Sarkar M; Bhowmick A K

The effect of polymer-filler interactions on swelling and dynamic mechanical properties of the sol-gel derived acrylic rubber (ACM)/silica epoxidised natural rubber (ENR)/silica and poly(vinyl alcohol) (PVA)/silica hybrid nanocomposites is described. The Kraus constants determined from the swelling measurements are substantially higher than that of carbon black filled conventional rubber composites. To understand the polymer-filler interaction the dynamic mechanical properties of the hybrid nanocomposites are studied at two temperatures. The drop in storage modulus with dynamic strain is found to be greatest for ACM/silica. For all systems the effect is higher at the higher temperature. The observations are due to the strength of polymer-filler interactions and the additional effects of higher thermal energy at the higher temperature. 34 refs.

Kharagpur Indian Institute of TechnologyINDIA

Accession no. 950590

Item 215Polymer Materials Science and Engineering21, No.3, 2005, p.212PREPARATION AND EVALUATION OF PVA POLARIZING FILMYa-Man Zuo; Wan-Qi Qiu; Zheng-Yi Liu; Jian-Xun Gong

Polarising films containing iodine and iodine nickel and cobalt were fabricated and their optical properties investigated. 5 refs.

South China University of TechnologyCHINA

Accession no. 948126

Item 216Journal of Polymer Science: Polymer Physics Edition43, No.15, 2005, p.1944STUDY OF THE EFFECT OF POLY(VINYL ALCOHOL) CONCENTRATION ON THE GELATION POINT OF POLY(VINYL ALCOHOL) POLY(ACRYLIC ACID) SEMI-IPN SYSTEMS AS DETERMINED BY VISCOELASTIC MEASUREMENTSHenandez R; Mijangos C; Lopez D

References and Abstracts

The effects of poly(vinyl alcohol)(PVA) concentration on the gelation point of PVA/poly(acrylic acid) semi-interpenetrating network (semi-IPNs) systems prepared by a sequential method and crosslinked with N,N'-methylenebisacrylamide were investigated by viscoelastic measurements. The molecular structures of the semi-IPNs are discussed in terms of loosely crosslinked gels composed of swollen clusters. 22 refs.

Madrid Instituto de Ciencia y Tec.de PolimEU; EUROPEAN COMMUNITY; EUROPEAN UNION; SPAIN; WESTERN EUROPE; WESTERN EUROPE-GENERAL

Accession no. 947761

Item 217Macromolecular Research13, No.4, 2005, p.314PREPARATION OF ION EXCHANGE MEMBRANES FOR FUEL CELL BASED ON CROSSLINKED POLY(VINYL ALCOHOL) WITH POLY(ACRYLIC ACID-CO-MALEIC ACID)Dae Sik Kim; Ho Bum Park; Chang Hyun Lee; Young Moo Lee; Go Young Moon; Sang Yong Nam; Ho Sang Hwang; Tae II Yun; Ji Won Rhim

Crosslinked polyvinyl alcohol (PVA) membranes are prepared at various crosslinking temperatures using poly(acrylic acid-co-maleic acid) (PAM) with differing PAM content. The proton conductivity and methanol permeability are investigated for PVA/PAM membranes with 3-13 wt% in the temperature range 25-80C. Both properties are very dependent of the PAM content and decrease with increasing PAM content. Ambient temperature proton conductivity is in the range 0.001-0.001 S/cm and the methanol permeability in the range 10-7 to 10-6 cm2/s. The effects of crosslinking and concentration of ionomer groups are discussed in terms of water content ion exchange capacity and fixed ion concentration. 18 refs.

Hanyang University; LG Chem; Gyeongsang National University; Hannam UniversityKOREA

Accession no. 947678

Item 218Journal of Membrane Science259, No.1-2, 2005, p.65SIGNIFICANT INCREASE OF PERMEATION FLUX AND SELECTIVITY OF POLY(VINYL ALCOHOL) MEMBRANES BY INCORPORATION OF CRYSTALLINE FLAKE GRAPHITEPeng F; Lu L; Hu C; Wu H; Jiang Z

The preparation of poly(vinyl alcohol)(PVA) membranes incorporating crystalline flake graphite and their characterisation by positron lifetime spectroscopy and degree of swelling is described. The effects of graphite content feed composition and operating temperature on

the pervaporation properties of the composite membranes for separating benzene/cyclohexane mixtures were investigated and the results are discussed in comparison with those for PVA and crosslinked PVA membranes.

Tianjin UniversityCHINA

Accession no. 945711

Item 219Macromolecules38, No.13, 2005, p.5475POLY(VINYL ESTER) STAR POLYMERS VIA XANTHATE-MEDIATED LIVING RADICAL POLYMERIZATION: FROM POLY(VINYL ALCOHOL) TO GLYCOPOLYMER STARSBernard J; Favier A; Ling Zhang; Nilasaroya A; Davis T P; Barner-Kowollik C; Stenzel M H

Xanthate interchange reversible addition fragmentation polymerisation with Xanthate attachment to the core by either a fragmenting or non-fragmenting covalent bond was used to prepare polyvinyl ester stars polymers. Using the fragmenting covalent bond approach resulted in well-defined star polymers of vinyl acetate vinyl pivalate or vinyl neodecanoate with narrow polydispersity. Polymers of wider polydispersity were obtained at medium to high conversions with the non-fragmenting covalent bond method probably due to congestion around the xanthate functionality. Conversion by hydrolysis of the polyvinyl esters to polyvinyl alcohol resulted in destruction of the star architecture due to cleavage of the xanthate linkage. Early experiments in the preparation of star shaped glycopolymers using the fragmenting covalent bond approach is described and discussed but further work in this area is still required 34 refs.

New South Wales UniversityAUSTRALIA

Accession no. 944734

Item 220Journal of Membrane Science255, No.1-2, 2005, p.181SEPARATION OF AZEOTROPIC MIXTURE USING MODIFIED PVA MEMBRANEUpadhyay D J; Bhat N V

PVAl membrane (4 wt %) was modified with 0.05 to 0.2 wt % lithium chloride in order to investigate the effect of addition of alkali salt on separation of water-isopropyl alcohol mixture. The surface of cast membranes was crosslinked by exposure to low-pressure nitrogen plasma. The separation performance of modified membrane was analysed by pervaporation technique at 25C and improvements in the flux and the selectivity for purification of water molecules were demonstrated. Characterisation of modified membranes was performed using FTIR spectroscopy DSC and wide-angle X-ray diffraction techniques. It was found that the membrane

References and Abstracts

became semicrystalline to amorphous on addition of lithium chloride to PVAl which affected the separation performance.

Randox Laboratories Ltd.; Bombay Textile Research Assn.EU; EUROPEAN COMMUNITY; EUROPEAN UNION; INDIA; UK; WESTERN EUROPE; WESTERN EUROPE-GENERAL

Accession no. 943160

Item 221Journal of Membrane Science250, No.1-2, 2005, p.167IMMOBILIZATION OF CELLULASE IN NANOFIBROUS PVA MEMBRANES BY ELECTROSPINNINGLili Wu; Xiaoyan Yuan; Jing Sheng

The immobilisation of the enzyme cellulase in nanofibrous poly(vinyl alcohol) (PVA) membranes was investigated by electrospinning from an acetic acid solution of PVA and cellulase and crosslinking by glutaraldehyde vapour. The catalytic activity of the immobilised enzyme was compared to that of the free enzyme and the effects of enzyme loading efficiency and crosslinking time on catalytic activity are discussed.

Tianjin UniversityCHINA

Accession no. 941320

Item 222Polymer International54, No.5, 2005, p.796PREPARATION AND CHARACTERIZATION OF SPONGY CRYOGELS OF POLY(VINYL ALCOHOL)-CASEIN SYSTEM: WATER SORPTION AND BLOOD COMPATIBILITY STUDYBajpai A; Saini R

Novel blend hydrogels of polyvinyl alcohol (PVA) and casein were prepared by repeated freeze-thaw cycles of aqueous solutions. The dried gel pieces were characterised by FTIR spectroscopy DSC and SEM. The water sorption capacities of the gels were determined and the effects of the PVA and casein components the number of freeze-thaw cycles pH temperature salts and swelling bath temperature were estimated. The hydrogels showed a good degree of blood capacity during tests for bovine serum albumin adsorption blood clot formation and haemolytic activity. 40 refs.

Jabalpur Government Autonomous Science CollegeINDIA

Accession no. 940919

Item 223Journal of Applied Polymer Science96, No.3, 2005, p.808

PROPERTIES OF CHITOSAN/POLY(VINYL ALCOHOL) FILMS FOR DRUG-CONTROLLED RELEASEQun Wang; Yu-min Du; Li-hong Fan

Combination crosslinked polymer films of chitosan and polyvinyl alcohol (PVA) crosslinked and loaded with bovine serum albumin as a model drug were prepared by casting and solvent evaporation. They were characterised using X-ray diffraction scanning electron microscopy Fourier transform infrared spectroscopy and their drug release properties were determined. Drug release was affected by component ratio of the films loading of model drug and pH and ionic strength of the release solution. Highest drug release rates were obtained at low drug levels high PVA levels in the film low pH levels in the release solution and high ionic strength of the release solution. Crosslinking of the films reduced release rates. 24 refs.

Wuhan UniversityCHINA

Accession no. 940699

Item 224Molecular Crystals and Liquid Crystals426, 2005, p.205NEW OPTICAL NONLINEAR MATERIAL BASED UPON PVA WITH PBS QUANTUM DOTSLyakhovetsky V R; Volkov V I; Borshch A A; Brodyn M S; Strashnikova M I; Reznichenko V Y; Kutsenko A S; Maloletov S M; Kuchmy S Y; Kajzar F

The preparation of nanocomposite films of poly(vinyl alcohol) with nanocrystals of the semiconductor lead sulphide and their characterisation by XRD microinterferometry (film thickness) and UV-visible spectroscopy is described. The third order nonlinear optical susceptibility of the nanocomposites was investigated in the visible region by refractive index dispersion measurements and the results are discussed. 17 refs.

Ukraine Institute of Physics; Kiev Institute of Physical Chemistry; CEA-SaclayEU; EUROPEAN COMMUNITY; EUROPEAN UNION; FRANCE; UKRAINE; WESTERN EUROPE; WESTERN EUROPE-GENERAL

Accession no. 940437

Item 225Macromolecular SymposiaNo.222, 2005, p.163PREPARATION AND CHARACTERIZATION OF INTERPENETRATING POLYMER HYDROGELS BASED ON POLY(ACRYLIC ACID) AND POLY(VINYL ALCOHOL)Hernandez R; Lopez D; Perez E; Mijangos C

The synthesis of interpenetrating polymer hydrogels of poly(vinyl alcohol) (PVA) and poly(acrylic acid)(PAA) by a sequential process involving firstly crosslinking copolymerisation of acrylic acid and NN'-methylenebisacrylamide in the presence of PVA followed

References and Abstracts

by a freeze-thaw procedure to form the PVA hydrogel within the PAA hydrogel is described. The products were characterised by swelling viscoelastic properties and carbon-13 NMR and the results are discussed. 7 refs.

Madrid Instituto de Ciencia y Tec.de Polim.EU; EUROPEAN COMMUNITY; EUROPEAN UNION; SPAIN; WESTERN EUROPE; WESTERN EUROPE-GENERAL

Accession no. 940406

Item 226International Polymer Science and Technology31, No.9, 2004, p.T/47-50ACID HYDROLYSIS OF VINYL ACETATE IN AN AQUEOUS MEDIUM IN THE PRESENCE OF NON-IONOGENIC SURFACTANTS AND POLYVINYL ALCOHOLKaramyan D R; Sergeeva C N; Beileryan N M; Voskanyan P S; Eritsyan V K; Gevorkyan L A

This article considers the use of emulsion polymerisation for the production of vinyl acetate copolymers and the incorporation of non-ionogenic surfactants for the initiation of polymerisation. In order to ensure an acceptable rate of decomposition of the initiating system use is made of additives and in particular acids to regulate the pH value of the reaction mixture. It is known that vinyl acetate undergoes hydrolysis in an aqueous medium with the formation of acetaldehyde and acetic acids which have a negative effect both on the polymerisation process and on the quality of the polyvinyl acetate formed. Work was carried out to study the hydrolysis of vinyl acetate in an aqueous medium under the conditions of polymerisation and the effect on hydrolysis of the components of the reaction system at working concentrations. Results are given of an investigation of the rates of acid hydrolysis of vinyl acetate in an aqueous medium in the presence of non-ionogenic surfactants. 5 refs. (Article translated from Plasticheskie Massy No.1 2004 pp.22).RUSSIA

Accession no. 937776

Item 227Proceedings of the 62nd SPE Annual conference (ANTEC 2004) held Chicago Ilp.2437CHARACTERISTICS AND PERFORMANCE OF STARCH-POLY-(VINYL ALCOHOL) (PVA) BLENDS WITH AGRICULTURAL WASTE FIBERImam S H; Glenn G M; Shey J; Clamczynski A; Wood D; Nguyen T; Cornish K; Orts W J

The renewable polymers are environmentally friendly and naturally biodegradable and could serve as an inexpensive source of raw material for single-use engineered products. Efforts are underway to develop ecocompatible consumer plastics by incorporating renewable polymers as an alternative to petroleum-derived chemicals. Therefore gaining fundamental understanding of biobased polymers

is critical for the design and development of consumer products. The research efforts at the USDA laboratory pertaining to the development of biopolymer blends polymer processing characterisation and lifetime evaluation are presented. 14 refs.USA

Accession no. 937601

Item 228Polymer45, No.26, 2004, p.8801GEL SPINNING OF PVA/SWNT COMPOSITE FIBERZhang X; Liu T; Sreekumar T V; Kumar S; Hu X; Smith K

An optically hom*ogeneous dispersion of single wall carbon nanotubes (SWNT) and polyvinyl alcohol (PVA) was prepared in DMSO/water by stirring and sonication. The dispersion was extruded into composite fibres into methanol via gel spinning and the tensile and dynamic mechanical properties of the dried fibres were determined. UV visible and Raman spectroscopy wide-angle X-ray diffraction and SEM were also carried out. The modulus of the PVA/SWNT (3 wt%) composite fibre was 40% higher than that of a control fibre spun from PVA gel. PVA orientation in the control and composite fibres was similar but the composite fibres exhibited lower crystallinity. 39 refs.

Georgia Institute of Technology; Carbon Nanotechnologies Inc.USA

Accession no. 937376

Item 229Polymer45, No.26, 2004, p.8779POLY(VINYL ALCOHOL) HYDROGEL FIXATION ON POLY(ETHYLENE TEREPHTHALATE) SURFACE FOR BIOMEDICAL APPLICATIONLi Y; Neoh K G; Kang E T

Poly(vinyl alcohol) (PVA) hydrogel was immobilised onto a surface-functionalised poly(ethylene terephthalate) (PET) film to improve the film biocompatibility. The film was subjected to an argon plasma glow discharge then graft copolymerised with poly(ethylene glycol) monomethacrylate in the presence of ethylene glycol dimethacrylate as crosslinker before oxidisation with acetic anhydride-DMSO to produce aldehyde groups on the PET surface. ATR FTIR and X-ray photoelectron spectroscopy were used to study the surface at each stage. The aqueous PVA solution containing formaldehyde as crosslinker was covalently immobilised on the film by heating at 50 degC for eight hours. SEM was used to confirm the strong attachment. Heparin was immobilised on the PVA-covered PET by physical entrapment or covalent

References and Abstracts

bonding to improve the biocompatibility of the film. The biocompatibilities of the various surface-modified PET films were evaluated by plasma recalcification time and blood platelet adhesion measurements. 41 refs.

Singapore National UniversitySINGAPORE

Accession no. 937374

Item 230Proceedings of the 62nd SPE Annual conference (ANTEC 2004) held Chicago Ilp.1451INFLUENCE OF NANOPARTICLES ON THE SHRINKAGE CONTROL OF LOW PROFILE UNSATURATED POLYESTER COMPOSITESLiqun Xu; Lee L J

Unsaturated polyester(UP) resins are one of the most widely used materials in fabricated composites. However a number of problems caused by their high polymerisation shrinkage have limited their growth in many new markets. The authors' research results showed that 1 to 3 wt % of nanoclay can provide excellent volume shrinkage control of UP resin systems containing polyvinyl acetate as a low profile additive(LPA) in room temperature moulding processes. Nanoclay residing in the LPA-rich phase led to a higher reaction rate and earlier onset of micro-cracking in the resin system. Consequently an earlier volume expansion during curing was observed in the reactive dilatometry experiment resulting in better shrinkage control. 8 Refs.USA

Accession no. 935598

Item 231Proceedings of the 62nd SPE Annual conference (ANTEC 2004) held Chicago Ilp.1810SOME STUDIES ON MONTMORILLONITE(MMT) FILLED POLYPROPYLENE COMPOSITE SYSTEMSLi R K Y; Shi D

Two aspects of PP/MMT composite systems are considered. In the first part the effect of using MMT particles as the initiator carrier in the melt grafting reaction of maleic anhydride(MAH) onto PP backbone is presented. It was found that using this method the degradation of the PP molecular chains can be significantly reduced. In the second part a method of improving the dispersion of MMT particles in PP/MMT nanocomposites is presented. This new method involves the pretreatment of MMT particles with PVA and the results show that the method is effective in improving the dispersion of MMT particles in PP matrix. 9 refs.CHINA; HONG KONG

Accession no. 935460

Item 232Journal of Materials Science40, No.3, 2005, p.777NONLINEAR REFRACTION OF COOMASSIE BRILLIANT BLUE DYE IN PVA MATRIXValsalamilka B; Sreekumar G; Muneera C I; Sendhil K; Vijayan C

The organic chromophore Coomassie Brilliant Blue R-250 was prepared in solid film form in a PVAl matrix and investigated by the Z-scan technique using a laser beam. The chromophore exhibited a negative refractive non-linearity and a non-linear coefficient of refractive index at a wavelength of 632.8 mm of 2.45 times 10 to the power 12 sq.m2/w. 11 refs.

Kerala University; Indian Institute of TechnologyINDIA

Accession no. 935244

Item 233Polymer46, No.4, 2005, p.1379GRAFTING AND ADSORPTION OF POLY(VINYL) ALCOHOL IN VINYL ACETATE EMULSION POLYMERIZATIONCarra S; Sliepcevich A; Canevarolo A; Carra S

The role of PVAl as a protective colloid in the emulsion polymerisation of vinyl acetate was investigated using various polyvinyl alcohols. The effect of PVAl blockiness on emulsion polymerisation and latex properties was examined and the rheological properties of the various latices obtained determined. Fractions of PVAl in the final latex were separated using a selective solubilisation procedure and the results obtained compared with those for the adsorption of PVAl onto emulsifier-free PVAc dispersions. 12 refs.

Mapei SpA; Milano PolitecnicoEU; EUROPEAN COMMUNITY; EUROPEAN UNION; ITALY; WESTERN EUROPE; WESTERN EUROPE-GENERAL

Accession no. 934216

Item 234Chemistry of Materials17, No.1, 2005, p.9NANOPARTICLE-EMBEDDED POLYMER: IN SITU SYNTHESIS FREE-STANDING FILMS WITH HIGHLY MONODISPERSE SILVER NANOPARTICLES AND OPTICAL LIMITINGPorel S; Singh S; Harsha S S; Rao D N; Radhakrishnan T P

The fabrication of free-standing films of silver nanoparticle-embedded poly(vinyl alcohol)(PVA) by spin-coating an aqueous solution containing silver nitrate and PVA onto quartz or polystyrene-coated glass substrates followed by thermal treatment is described. The films were characterised by TEM plasmon absorption and nonlinear optical properties and the results are discussed. 19 refs.

References and Abstracts

Hyderabad University; Hyderabad Centre for Cellular and Molecular BiologyINDIA

Accession no. 933909

Item 235Polymers and Polymer Composites12, No.7, 2004, p.561RHEOLOGICAL PROPERTIES OF HIGH MOLECULAR WEIGHT POLY(VINYL ALCOHOL)/DIMETHYL SULFOXIDE/WATER CONCENTRATED SOLUTIONSSung Jun Lee; Jin Woo Kwak; Hyo Dae Kim; Han Yong Jeon; Joon Ho Kim; Won Sik Yoon; Won Seok Lyoo

Before carrying out gel spinning of polyvinyl acetate (PVA) to prepare high-performance PVA fibres the rheological properties of solutions of high molecular weight PVA in dimethyl sulphoxide(DMSO)/water mixtures was studied with various polymer concentrations at various temperatures. Polymer concentration and solution temperature was shown to play a significant role in the rheological behaviour of high molecular weight PVA solutions. Over the frequency range examined PVA solutions showed shear thinning behaviour at lower temperatures and as the polymer concentration was increased the extent of shear thinning also increased. In the plot of storage modulus of PVA solution with loss modulus the slope was less than 2 indicating that the phase of PVA solutions in DMSO/water is heterogeneous. 21 refs.

Yeungnam University; Kolon Industries Inc.; Chonnam National UniversityKOREA

Accession no. 933607

Item 236ACS Polymeric Materials: Science and Engineering, Spring Meeting90, 2004, p.746ULTRASONIC INITIALLY CATALYZED EMULSION POLYMERIZATION OF VINYL ACETATE BY USING REDOX INITIATORBahattab M A Saudi

Ultrasonic energy was used to initiate emulsion polymerisation of vinyl acetate at room temperature and using a non-thermal redox initiator in the absence of inert gas. The initiator was a mixture of ferrous sulphate heptahydrate sodium persulphate and sodium metabisulphite. A combination of ultrasonic energy and redox initiator was shown to result in higher conversion and higher rate of polymer production compared with using redox initiator alone. 12 refs.SAUDI ARABIA

Accession no. 933337

Item 237European Polymer Journal41, No.2, 2005, p.329STUDIES ON THE VISCOSITY BEHAVIOR OF POLYMER SOLUTIONS AT LOW CONCENTRATIONSHaiyang Yang; Yunfei Yan; Pingping Zhu; Hao Li; Qingren Zhu; Chenggao Fan

The viscosities of solutions of poly(vinyl alcohol) (PVA) poly(N-vinyl-2-pyrrolidone) (PVP) and poly(ethylene oxide) (PEO) were measured down to low concentrations. The flow time of the pure solvent in ideal conditions (t0(asterisk)) obtained by extrapolating the flow time of polymer solution t to zero concentration was not equal to the flow time of the pure solvent (t0). The reduced viscosity calculated as (t/t0 - 1)/C (where C is the concentration) exhibited either a marked increase or a significant decrease with dilution depending on the polymer solution investigated. On the other hand the reduced viscosity calculated as (t/t0(asterisk) - 1)/C was proportional to C even at low concentrations. The anomalous viscosity behaviour of neutral polymer solutions at low concentrations is therefore a result of an incorrect method for calculating the reduced viscosity. The effective diameter of the viscometer capillary the surface properties of the capillary wall and the additional pressure corresponding to the measurement of t and t0 were different for PVA PVP and PEO solutions. By taking into account the contact angle and the surface tension of the liquid together with the geometric parameters for the viscometer the effect of the additional pressure on the flow-time measurement could be studied quantitatively. The thickness of the adsorbed polymer layers on the capillary walls was markedly affected by the nature of the solvent in which the polymer molecules were dissolved whereas molecular weight of the polymer had little or no effect on the thickness of the adsorbed layers of polymer on the walls of the viscometer capillary. 45 refs.

China University of Science & TechnologyCHINA

Accession no. 932585

Item 238CSIC Macromolecules37, No.25, 2004, p.9620CONTROLLING PVA HYDROGELS WITH GAMMA-CYCLODEXTRINHernandez R; Rusa M; Rusa C C; Lopez D; Mijangos C; Tonelli A E

Details are given of the preparation and characterisation of PVAL hydrogels formed during freeze-thaw cycles of their aqueous solutions containing gamma-cyclodextrin. Confirmation of the existence of the channel structure for gamma-cyclodextrin was achieved by characterising the dried hydrogels with solid-state DSC TGA wide-angle X-ray diffraction and carbon 13C-NMR. Swelling and rheological responses are discussed. 20 refs.

References and Abstracts

North Carolina State University;EU; EUROPEAN COMMUNITY; EUROPEAN UNION; SPAIN; USA; WESTERN EUROPE; WESTERN EUROPE-GENERAL

Accession no. 931773

Item 239Polymer International53, No.12, 2004, p.2138SYNTHESIS AND CHARACTERIZATION OF COPOLYMERS OF POLY(VINYL ALCOHOL) WITH THIOPHENE SIDE-GROUPS AND PYRROLESahmetlioglu E; Yuruk H; Toppare L; Canga I; Yagci Y

Graft copolymers of polyvinyl alcohol with thiophene side-groups and pyrrole are synthesised by electrochemical polymerisation methods. Polyvinyl alcohol with thiophene side-groups (PVATh) is obtained from the reaction between polyvinyl alcohol (PVA) and thiophene-3-acetic acid. The syntheses of copolymers of PVATh and pyrrole are achieved electrochemically by using three different supporting electrolytes p-toluene sulphonic acid (PTSA) sodium dodecyl sulphate (SDS) and tetrabutylammonium tetrafluoroborate (TBAFB). Characterisation of PVATh and graft copolymers is performed by a combination of techniques including cyclic voltammetry scanning electron microscopy thermal gravimetry differential scanning calorimetry size exclusion chromatography 1H-NMR and FT-IR. The conductivities are measured by the four-probe technique. 11 refs.

Turkey Nigde University; Ankara Middle East Technical University; Istanbul Technical UniversityTURKEY

Accession no. 931499

Item 240Colloid and Polymer Science283, No.1, 2004, p.24HYDROGELS IN AQUEOUS PHASES OF POLYVINYLALCOHOL(PVA) SURFACTANTS AND CLAY MINERALSJing Liu; Hoffmann H

Aqueous dispersions of a synthetic clay mineral were shown to be transformed by amphiphilic water-soluble polymers such as PVAl into soft gels. The polymer bonded onto the clay mineral and the adsorbed coils acted like crosslinking agents between the clay mineral particles. The resulting gels had a yield stress value and a frequency-independent storage modulus. Under saturation the clay mineral particles could adsorb five times their own weight of PVAl. Anionic surfactant adsorbed on PVAl and rendered it hydrophilic. As a consequence PVAl could no longer bind to the clay mineral and the gels were transformed into low viscosity aqueous solutions. 21 refs.

Bayreuth University

EU; EUROPEAN COMMUNITY; EUROPEAN UNION; GERMANY; WESTERN EUROPE; WESTERN EUROPE-GENERAL

Accession no. 931069

Item 241Journal of Polymer Science: Polymer Chemistry Edition42, No.24, 2004, p.6331ULTRAFINE HYDROGEL FIBERS WITH DUAL TEMPERATURE- AND PH-RESPONSIVE SWELLING BEHAVIORSHong Chen; You-Lo Hsieh

Ultrafine hydrogel fibres responsive to both temperature and pH signals were prepared by electrospinning of mixtures of poly(N-isopropylacrylamide) (PNIPAAm) and poly(acrylic acid) in DMF. Both the diameters and packing of the fibres could be controlled by changing the polymer compositions and the molecular weights of PNIPAAm. These fibres were rendered water-insoluble by the addition of either disodium phosphate or poly(vinyl alcohol) (PVA) to the solution followed by heat curing of the fibres. The fibres crosslinked with disodium phosphate swelled to 30-120 times in water; this was significantly more than the swelling of fibres crosslinked with PVA. The PVA-crosslinked hydrogel fibres however showed more rapid swelling reaching equilibrium in less than 5 min at 25 deg C. They were also more stable after 1 week of water exposure. All the hydrogel fibres showed a marked increase in swelling between pH 4 and 5. The PVA-crosslinked hydrogel fibres exhibited distinct temperature-responsive phase-transition behaviour of PNIPAAm whereas the disodium phosphate-crosslinked hydrogel fibres showed altered two-stage phase transitions that reflected side-chain modification of PNIPAAm. 27 refs.

California University at DavisUSA

Accession no. 930384

Item 242ACS Polymeric Materials: Science and Engineering, Fall Meeting89, 2003, p.774EFFECTS OF REACTIVE VINYL ACETATE-BASED BLOCK COPOLYMERS ON THE SHRINKAGE AND INTERNAL PIGMENTABILITY FOR LOW-TEMPERATURE CURE OF UNSATURATED POLYESTERHuang Y-J; Dong J-P; Chiu S-G; Hsu M-W

Details are given of the effects of reactive vinyl acetate-based block copolymer types of low profile additives on the volume shrinkage characteristics and internal pigmentability for styrene/unsaturated polyester/additive ternary systems cured at low temperatures. Cure kinetics were determined by DSC and morphology of fractured surfaces were examined using SEM. Volume shrinkage

References and Abstracts

and colour depth were measured by density measurements and by using a chromameter. 13 refs.CHINA

Accession no. 929526

Item 243E-PolymersNo.78, 2004, p.1ELECTROSPUN POLY(VINYL ALCOHOL)/POLY(ACRYLIC ACID) FIBRES WITH EXCELLENT WATER-STABILITYZeng J; Hou H; Wendorff J H; Greiner A

The effects of annealing with poly(acrylic acid)(PAA) on the water stability of electrospun poly(vinyl alcohol)(PVA) nanofibres were investigated by measurement of the swelling of solution-cast PVA/PAA films. The results are discussed in terms of the effects of reaction conditions including PVA/PAA ratio annealing temperature and time PAA molecular weight and use of an esterification catalyst on the water stability of electrospun PVA/PAA composite nanofibres. 11 refs.

Marburg Philipps UniversityEU; EUROPEAN COMMUNITY; EUROPEAN UNION; GERMANY; WESTERN EUROPE; WESTERN EUROPE-GENERAL

Accession no. 929436

Item 244Polymer Bulletin52, No.3-4, 2004, p.201PREPARATION OF MECHANICALLY CROSS-LINKED POLY(VINYL ALCOHOL)Kubo M; Hayakawa N; Minami Y; Tamura M; Uno T; Itoh T

A novel cyclic macromonomer based on a cyclic PS is prepared. Its radical copolymerisation with vinyl acetate is carried out to give a mechanically crosslinked polyvinyl acetate which is converted to a mechanically crosslinked polyvinyl alcohol with high swellability. 9 refs.

Mie UniversityJAPAN

Accession no. 929313

Item 245T3 Technical Textile Technology3, No.3, 2004, p.20NEW DOORS OPEN FOR COPOLYESTER ELASTOMER IN PADS AND COATINGSDusaj S; Karandikar A

Market needs are reported to have opened the door to new applications for copolyester elastomer. In one case this involves a call for reusable incontinence pads that cost less to maintain. Here a new pad construction having a barrier layer of Riteflex copolyester thermoplastic elastomer (COPE/TPE) lowers washing costs compared with the

predominant pads having PVC barriers. Another case involves the need for non-skid surfaces coated on fabrics that withstand industrial washing. Here Riteflex COPE/TPE provides an alternative this time by replacing PVOH and EVA. Details are given.

Precision Custom Coating; Ticona Corp.USA

Accession no. 929306

Item 246Journal of Applied Polymer Science94, No.6, 2004, p.2356PREPARATION OF HIGH MOLECULAR WEIGHT POLY(VINYL ALCOHOL) WITH HIGH YIELD BY EMULSION POLYMERIZATION OF VINYL ACETATE USING 2,2'-AZOBIS(2-AMIDINOPROPANE) DIHYDROCHLORIDEWon Seok Lyoo; Jin Woo Kwak; Kyu Ha Choi; Seok Kyun Noh

Preparation of high molecular weight polyvinyl alcohol PVAl and polyvinyl acetate (PVAc) shell/PVAl core microspheres by saponification of PVAc previously emulsion polymerised with an azo-initiator 2,2'-azobis(2-amidinopropane) dihydrochloride is described. Polymers prepared using this route were of higher molecular weight than those prepared using potassium persulphate as initiator. Characterisation of molecular weight was carried out by determination of intrinsic viscosity and calculation and morphology of microspheres by scanning electron microscopy. 32 refs.

Yeungnam UniversityKOREA

Accession no. 928530

Item 247Plastics Technology50, No.10, 2004, p.32PVOH FOR BLOWN FILM AND INJECTION MOLDING

A. Schulman Inc. of the USA has formulated a new extrudable polyvinyl-alcohol compound especially for blown films to be used in the place of solution-cast polyvinyl-alcohol films. The waster-soluble polymer known as AquaSol is also undergoing injection moulding field trials in applications where LDPE is typically used and there is a need for a biodegradable material.

SCHULMAN A.INC.USA

Accession no. 928021

Item 248Polymer45, No.24, 2004, p.8201DEGREE OF CROSSLINKING AND MECHANICAL PROPERTIES OF

References and Abstracts

CROSSLINKED POLY(VINYL ALCOHOL) BEADS FOR USE IN SOLID-PHASE ORGANIC SYNTHESISGauthier M A; Luo J; Calvet D; Ni C; Zhu X X; Garon M; Buschmann M D

The degree of crosslinking of swellable hydrophilic gel beads of poly(vinyl alcohol) (PVA) prepared with different quantities of epichlorohydrin (EP) crosslinker in the feed were examined by spectroscopic and chemical methods. Raman spectroscopy showed that the vast majority of EP crosslinks were monomolecular and doubly bonded to PVA. This allowed the degree of crosslinking to be determined by NMR spectroscopy and by titrating the functional group loading of the polymer before and after crosslinking. Single-bead unconfined compression studies showed that PVA with a 1:1 PVA/EPA ratio had a higher shear modulus than that with a 1:2 PVA/EPA ratio as a result of the increased cross-link density. PVA-EP beads swollen in water and DMF had significantly lower shear moduli than the model polystyrene-divinylbenzene beads as a result of their considerable degree of swelling in aqueous or polar media. 37 refs.

Montreal University; Montreal Ecole PolytechniqueCANADA

Accession no. 927301

Item 249ASTM D 4317. SPECIFICATION FOR POLYVINYL ACETATE-BASED EMULSION ADHESIVES Version 98 (R2004).

Photocopies and loans of this document are not available from Rapra.USA

Accession no. 925234

Item 250Journal of Applied Polymer Science93, No.4, 2004, p.1638ROLE OF MOLECULAR WEIGHT OF ATACTIC POLY(VINYL ALCOHOL) (PVA) IN THE STRUCTURE AND PROPERTIES OF PVA NANOFABRIC PREPARED BY ELECTROSPINNINGJoon Seok Lee; Kyu Ha Choi; Han Do Ghim; Sam Soo Kim; Du Hwan Chun; Hak Yong Kim; Won Seok Lyoo

Two different atactic PVAL nanofabrics prepared by electrospinning from two atactic PVALs with number-average degrees of polymerisation of 1700 or 4000. The process parameters such as electrical field tip-to-collector distance and solution concentration were varied and optimum electrospinning conditions were determined by morphological investigations. The nanofabric produced from the atactic PVAL of higher molecular weight showed superior crystalline properties thermal stability and mechanical properties. 29 refs.

Yeungnam University; Chonbuk National UniversityKOREA

Accession no. 924441

Item 251Polymer45, No.21, 2004, p.7193CHARACTERIZATION OF POLY(VINYL ALCOHOL)/POLY(ETHYLENE GLYCOL) HYDROGELS AND PVA-DERIVED HYBRIDS BY SMALL-ANGLE X-RAY SCATTERING AND FTIR SPECTROSCOPYMansur H S; Orefice R L; Mansur A A P

Novel poly(vinyl alcohol) (PVA)/poly(ethylene glycol) (PEG) hydrogel blends and PVA-derived organic-inorganic hybrid materials were prepared and nanostructurally characterised. PVA and PEG hydrogels were prepared treating aqueous solutions of the polymer with glutaraldehyde (GA) as a chemical crosslinker. Hybrids were prepared by treating aqueous solutions of PVA with tetraethoxysilane (TEOS). PVA/TEOS hybrids were also modified on the nanometer scale by crosslinking with GA during the synthesis reaction. Small-angle X-ray scattering studies indicated different nano-ordered disperse phases for hydrogels made of PVA PEG PVA/GA and PVA/PEG. PVA/TEOS and PVA/TEOS/GA hybrids also showed different X-ray scattering patterns. 24 refs.

Minas Gerais Universidade FederalBRAZIL

Accession no. 924049

Item 252Polymer45, No.21, 2004, p.7129PREPARATION AND MAGNETOMETRIC CHARACTERIZATION OF IRON OXIDE-CONTAINING ALGINATE/POLY(VINYL ALCOHOL) NETWORKSNishio Y; Yamada A; Ezaki K; Miyash*ta Y; Furukawa H; Horie K

Alginate-based magnetic gels were prepared by sequential crosslinking of alginate in aqueous ferrous salt solution immersion of the resulting gels in a solution of an alkaline earth metal and treatment of the partially cation-exchanged gels with hydrogen peroxide. Magnetometry measurements showed that the lyophilised gels had superparamagnetism or ferromagnetism at room temperature depending on the type of metallic cation used in the alkali treatment. Interpenetrating network (IPN)-type alginate/poly(vinyl alcohol) (PVA) gels containing iron oxides were also prepared from mixed polymer solutions by a modified preparation method in which the gelation and alkali treatment were performed by using a metallic borate. The viscoelasticity of the magnetic IPN composites in the gelatinous state could be controlled by changing the ratio of alginate to the PVA. The magnetic characteristics

References and Abstracts

of the IPN varied on changing the alginate/PVA ratio the alkaline reagent and the temperature. 24 refs.

Kyoto University; Tokyo University of Agriculture & TechnologyJAPAN

Accession no. 924041

Item 253China Synthetic Fiber Industry27, No.4, 2004, p.31DISCUSSION ON PROCESS TECHNOLOGY OF WATER-SOLUBLE PVA FIBER VIA WET SPINNINGYun H

The preparation of water-soluble PVAl fibre feedstock selection spinning solution preparation spinning and post-treatment conditions are discussed. Conditions for the production of water-soluble PVAl fibres having a dissolution temperature higher than 60C are described. 1 ref.

SINOPEC; Sichuan Vinylon WorksCHINA

Accession no. 923428

Item 254Analytica Chimica Acta519, No.2, 2004, p.147POLYMERIC PH INDICATORS IMMOBILIZED PVA MEMBRANES FOR OPTICAL SENSORS FO HIGH BASICITY BASED ON KINETIC PROCESSLiu Z; Luo F; Chen T

Two kinds of polymeric pH indicators PPF (phenolphthalein-formaldehyde product) and CPF (ortho-cresolphthalein-formaldehyde product) immobilised crosslinked polyvinyl alcohol membranes (PPF-PVA and CPF-PVA) for optical intermittent determination of high basicity ((OH) = 1-8 M) based on a kinetic process are developed. It has previously been demonstrated that PPF-PVA and CPF-PVA can perform the determination of high pH values from pH 10 to 14. The discolouring kinetic behaviours of PPF-PVA and CPF-PVA are compared with those of free phenolphthalein ortho-cresolphthalein and thymolphthalein. Experimental results and theoretical analysis indicate that the response behaviours of the optodes' membranes in concentrated NaOH solutions are diffusion independent and still comply with the pseudo-first-order kinetics. In addition two data analysis methods for determination are presented. One is directly based on the reduced absorbance; the other is based on the discolouring kinetic constant. It is found that the latter can perform a rapid (60 s) and reliable (relative standard deviation: 2.6%) determination for high basicity. These kinds of optodes can be used repeatedly when they are immersed in low-pH solutions to regain the protonated form after each determination.

Chinese Academy of SciencesCHINA

Accession no. 923177

Item 255Polymer45, No.17, 2004, p.5863SYNTHESIS AND CHARACTERIZATION OF HYDROPHOBICALLY MODIFIED POLY(VINYL ALCOHOL) HYDROGEL MEMBRANEGholap S G; Jog J P; Badiger M V

A series of hydrophobically modified poly(vinyl alcohol) (PVA) samples were synthesised by graft copolymerisation of N-tert-butylacrylamide [NTBA] onto PVA by free-radical polymerisation. Membranes were cast from solutions of the copolymers in dimethyl sulphoxide. The increase in hydrophobicity with increasing NTBA content was investigated by contact-angle measurements. The swelling behaviour of membranes was studied as a function of temperature hydrophobic content annealing temperature and period. The permeability of solutes through the membranes was investigated as a function of solute size membrane hydrophobicity and temperature. The swelling behaviour of the copolymer membranes showed that a lower content of NTBA gives discontinuous volume transition with respect to temperature whereas the presence of higher amounts of NTBA produced a decrease in the swelling ratios. The permeabilities of solutes through these membranes were strongly dependent on the size of the solute the solution temperature and hydrophobicity of the membrane. 29 refs.

Pune National Chemical LaboratoryINDIA

Accession no. 922416

Item 256Polymer45, No.7, 2004, p.2381CHARACTERISTIC RHEOLOGICAL FEATURES OF PVA SOLUTIONS IN WATER-CONTAINING SOLVENTS WITH DIFFERENT HYDRATION STATESSong S I; Kim B C

The rheological properties of poly(vinyl alcohol) (PVA) solutions of different concentrations in mixtures of water with dimethyl sulphoxide or N-methylmorpholine N-oxide were investigated and compared using parallel-plate rheometry. The results are discussed in terms of the effects of the hydration state of the solvents ie the degree of association of the water content on the rheological and other physical properties such as gelation of the PVA solutions. 22 refs.

Hanyang UniversitySOUTH KOREA

Accession no. 921477

Item 257CNIC Polymer45, No.16, 2004, p.5543

References and Abstracts

VISCOELASTIC PROPERTIES OF POLY(VINYL ALCOHOL) HYDROGELS AND FERROGELS OBTAINED THROUGH FREEZING-THAWING CYCLESHernandez R; Sarafian A; Lopez D; Mijangos C

Poly(vinyl alcohol) (PVA) hydrogels were prepared by freezing-thawing cycles and their viscoelastic properties in the parallel-plate shear mode were evaluated as a function of temperature time degree of swelling concentration and the number of freezing-thawing cycles. The storage modulus was analysed in relation to a theoretical model based on the scaling approach. The results confirm the noncrystalline nature of PVA cryogels. PVA ferrogels were also prepared from aqueous solutions of PVA and a ferrofluid through freezing-thawing cycles and their viscoelastic properties were examined. The variation of the storage modulus with the ferrofluid concentration cannot be fitted by using classical theories. This was attributed to the small dimensions of the particles in the ferrogels and to the magnetic interactions between the particles. 28 refs.

EUROPEAN COMMUNITY; EUROPEAN UNION; SPAIN; WESTERN EUROPEAccession no. 920495

Item 258Polymer45, No.16, 2004, p.5407SPECTROSCOPIC INVESTIGATIONS OF MN2+ IONS DOPED POLYVINYLALCOHOL FILMSKumar G N H; Rao J K; Gopal N O; Narasimhulu K V; Chakradhar R P S; Rajulu A V

Mn2+ ions doped in poly(vinyl alcohol) (PVA) films were examined by electron paramagnetic resonance (EPR) luminescence and infrared spectral studies. The room-temperature EPR spectra exhibit sextet hyperfine structure centred at an effective g factor of approximately 2.0 characteristic of Mn(2+) ions in octahedral symmetry. The zero-field splitting parameter at room temperature was evaluated from the intensities of allowed hyperfine lines. The EPR spectra exhibit a marked concentration dependence. The paramagnetic susceptibility (chi) was calculated from the EPR data at various temperatures. The Curie constant and Curie temperature were evaluated from a plot of 1/chit. The emission spectrum of Mn(2+) ions doped PVA film exhibited three bands centred at 390 448 and 465 nm. The bands at 390 and 465 nm were attributed to recombination of free charge carriers whereas the band at 448 nm was attributed to the 4T1g to 6A1g transition of Mn(2+) ions. The excitation spectrum showed two bands at 250 and 216 nm attributed to host lattice absorption bands. 31 refs.

Sri Venkateswara University; Weizmann Institute of Science; Indian Institute of Science; Anantapur S.K.UniversityINDIA; ISRAEL

Accession no. 920480

Item 259Journal of Applied Polymer Science93, No.3, 2004, p.1264BITHIAZOLE-CONTAINING POLYMERIC COMPLEX AND PVA COMPOSITE FILM: PREPARATION AND MAGNETIC PROPERTIESLin C; Sun W; Jiang L; Wang L; Shen Z

The synthesis of bisthiazole-containing amide polymers and their corresponding metal complexes and the preparation of solution-cast composite films of the complexes with poly(vinyl alcohol) in various proportions and their characterisation by FTIR is described. The magnetic properties of the complexes and composite films were investigated and the results are discussed. 17 refs.

Zhejiang UniversityCHINA

Accession no. 919946

Item 260Journal of Applied Polymer Science93, No.3, 2004, p.1151THERMAL PROPERTIES OF POLY(VINYL ALCOHOL)-SOLUTE BLENDS STUDIED BY TMDSCStavropoulou A; Papadokostaki K G; Sanopoulou M

The thermal properties of blends of semi-crystalline poly(vinyl alcohol) (PVA) with a drug substance buflomedil pyridoxal phosphate (BPP) in various proportions were investigated by temperature-modulated DSC and TGA. The effects of the dispersion of BPP in the PVA matrix on glass transition temperature melting temperature crystallinity and thermal stability of the blends is discussed in terms of specific interactions between the polar groups of the two components. 16 refs.

Athens Democritos National Research CenterEUROPEAN COMMUNITY; EUROPEAN UNION; GREECE; WESTERN EUROPE

Accession no. 919932

Item 261Macromolecules37, No.9, 2004, p.3180GRAFTING OF PVA IN MINIEMULSION COPOLYMERIZATIONS OF N-BUTYL ACRYLATE AND METHYL METHACRYLATE USING WATER-SOLUBLE PARTIALLY WATER-SOLUBLE AND OIL-SOLUBLE INITIATORSKim N; Sudol E D; Dimonie V L; El-Aasser M

Mini-emulsion copolymerisations of methyl methacrylate and n-butyl acrylate initiated with water-soluble (hydrogen peroxide HPO) partially water soluble (tert-butyl peroxide TBHP) and oil soluble (tert-butyl peroctoate TBPO) initiators were carried out to study the grafting of PVAL at the oil/water interface. The amounts of grafted PVAL produced in the mini-emulsion copolymerisations initiated with TBHP and TBPO were considerably less than

References and Abstracts

those produced in the corresponding seeded emulsion polymerisations. The amount of grafted PVAL in seeded emulsion polymerisations initiated with TBHP decreased with increasing monomer/polymer ratio. In mini-emulsion polymerisations initiated with TBPO the grafting occurred mainly in the later stages of the polymerisation. These results supported the idea that the different internal viscosities at the interface may affect the termination reactions between primary radicals and PVAL macro radicals thus resulting in different degrees of grafting. In mini-emulsion polymerisation it was found that aqueous phase and interface grafting occurred in the HPO system but that interface grafting dominated in the TBHP system. Also the grafted PVAL in the TBHP system was still soluble which indicated that the grafted chains were short. The results were discussed. 16 refs.

Lehigh UniversityUSA

Accession no. 919431

Item 262Proceedings of the 61st SPE Annual Conference (ANTEC 2003) held Nashville, TNp.1962THERMOMECHANICAL CHARACTERIZATION OF BLENDS OF POLY(VINYL ACETATE) WITH SEMICRYSTALLINE POLYMERS FOR SHAPE MEMORY APPLICATIONSLiu C; Mether P T

Miscible blends of amorphous poly(vinyl acetate) (PVAc) and semicrystalline polylactide were prepared by melt mixing and pressed into films. The blends were characterised by thermogravimetric analysis wide-angle X-ray scattering and dynamic mechanical studies. Shape recovery was studied by bending samples into a helical shape at 65 C then fixing the shape by quenching in iced water. Shape recovery was recorded by video camera when the deformed sample was immersed in warm water. Each blend exhibited a single glass transition temperature indicating miscibility. The degree of crystallinity decreased monotonically with increasing PVAc content. This controlled the rubbery moduli by acting as physical crosslinking points. 11 refs.USA

Accession no. 918089

Item 263Journal of Applied Polymer Science93, No.1, 2004, p.122STUDIES OF SURFACE TENSION OF POLY(VINYL ALCOHOL): EFFECT OF CONCENTRATION TEMPERATURE AND ADDITION OF CHAOTROPIC AGENTSBhattacharya A; Ray P

It is generally considered that the H-bonds are responsible for the stabilisation of network of polyvinyl alcohol (PVA)

in water. The major types of intermolecular interactions from inorganic salts are responsible for the network of PVA and water which ruptures the multiple H-bonds between the OH groups of the polymer chains; therefore various ions possessing abilities to affect these bonds result in salting out. It has been suggested that water molecules in the region of ionic hydration spheres must have strong orientation preferences which could considerably restrict their ability to reorient and form hydration shells around nearby non-polar solutes and thus affect the microstructure. The primary objective is to study the variation of surface tension as it reflects the change in short-range forces. The surface tension behaviour with the variation of concentration and temperature for different molecular weights of PVA is also studied. 17 refs.

India Central Salt & Marine Chem.Res.Inst.INDIA

Accession no. 917919

Item 264Journal of Applied Polymer Science93, No.1, 2004, p.41EFFECT OF MOLECULAR WEIGHT ON THE RHEOLOGICAL PROPERTIES OF ATACTIC POLY(VINYL ALCOHOL)/DIMETHYLSULFOXIDE/WATER SOLUTIONLyoo W S; Lee S J; Kim J H; Noh S K; Ji B C; Kim B C

The molecular weight effect of atactic polyvinyl alcohol (a-PVA) on the rheological properties of 7.5 10.0 and 12.5 g/dL solutions of (a-PVA) with number-average degrees of polymerisation (Pn) of 4000 and 1700 in dimethyl sulphoxide/water mixture is described. a-PVA with a Pn of 1700 solutions exhibits almost Newtonian flow behaviour whereas high molecular weight a-PVA with a Pn of 4000 solutions exhibits shear-thinning behaviour. On the plot of storage and loss moduli of a-PVA with a Pn of 1700 solutions the dynamic storage modulus of PVA with a Pn of 1700 solutions is smaller than the dynamic loss modulus over the frequency range of 10-1 to 102 rad/s. However the dynamic storage modulus of PVA with a Pn of 4000 solutions ia smaller than the dynamic loss modulus in the sol state and in the post-gel state the dynamic storage modulus becomes larger than the dynamic loss modulus indicating the evolution of viscoelastic solid properties. 18 refs.

Yeungnam University; Kyungpook National University; Hangyang UniversityKOREA

Accession no. 917911

Item 265Polymer45, No.10, 2004, p.3305

References and Abstracts

THE MECHANICAL PROPERTY AND PHASE STRUCTURES OF WHEAT PROTEINS/POLYVINYL ALCOHOL BLENDS STUDIED BY HIGH-RESOLUTION SOLID-STATE NMRZhang X; Burgar I; Lourbakos E; Beh H

The effects of poly(vinyl alcohol)(PVOH) content on the phase structures and mechanical properties of blends of wheat proteins thermally processed with glycerol and water as plasticisers and PVOH were investigated using solid-state proton and carbon-13C-NMR DMA (loss modulus storage modulus) and tensile testing (tensile strength elongation at break Young's modulus). The results are discussed in terms of intermolecular interactions between blend components. 47 refs.

CSIRO Manufacturing and Infrastructure TechnologyAUSTRALIA

Accession no. 917116

Item 266Journal of Membrane Science240, No.1-2, 2004, p.37PREPARATION AND CHARACTERIZATION OF CROSSLINKED PVA/SIO2 HYBRID MEMBRANES CONTAINING SULFONIC ACID GROUPS FOR DIRECT METHANOL FUEL CELL APPLICATIONSKim D A; Park H B; Rhim J W; Lee Y M

Organic-inorganic hybrids based on polyvinyl alcohol (PVOH)/SiO2 hybrid membranes containing sulphonic acid groups are prepared using the sol-gel process under acidic conditions. The PVOH/sulphosuccinic acid (SSA)/silica hybrid membranes are fabricated from different SSA contents. The proton conductivity and methanol permeability of the hybrid membranes are studied with changing SSA content from 5 to 25 wt.%. It is found that the proton conductivity and the methanol permeability are dependent on the SSA content both as a crosslinking agent and as a donor of the hydrophilic SO3H group. Up to an SSA content of about 20 wt.% both of these properties decrease and above this SSA content they begin to increase with increasing SSA content. The proton conductivities of the PVOH/SSA/silica membranes are in the range of 103 to 102 S/cm and methanol permeabilities range between 108 and 107 cm2/s. The presence of silica particles in the organic polymer matrix which reduce the free water ratio of the membranes results in hybrids with markedly reduced methanol permeabilities. These characteristics of the PVA/SSA/silica hybrid membranes are desirable for future applications related to direct methanol fuel cells.

Hanyang University; Hannam UniversityKOREA

Accession no. 916931

Item 267Journal of Polymer Science: Polymer Physics Edition42, No.8, 2004, p.1451

RHEOLOGICAL PROPERTIES OF SOLUTIONS OF GENERAL-PURPOSE POLY(VINYL ALCOHOL) IN DIMETHYL SULFOXIDELee E J; Kim N H; Dan K S; Kim B C

The rheological properties of solutions of atactic poly(vinyl alcohol) (PVA) in dimethyl sulphoxide were studied as a function of concentration and molecular weight. The syndiotactic dyad content and weight-average molecular weight of PVA were 52% and 85000-186000 respectively. The molecular weight had a minor effect on the rheological behaviour for 10-14 wt.% solutions but the concentration had a major influence indicating the importance of polar interactions through the hydroxyl groups. On a modified Cole-Cole plot the solutions gave various curves with slopes of less than 2 rather than a single master plot the slope decreasing marginally with increasing concentration. The deviation from the master curve indicated that the solutions were rheologically heterogeneous despite optical transparency. For 14 wt.% PVA solutions the loss tangent varied with the shear rate and produced three distinct regions which indicated a shear-induced double sol-gel transition as the shear rate increased over 0.05-500 rad/s. 24 refs.

Sungshin Women's University; Hanyang UniversityKOREA

Accession no. 916809

Item 268Pharmaceutical Technology Europe16, No.4, 2004, p.37/46DEVELOPMENT OF PVA COPOLYMER CAPSULESHoshi N; Ogura T; Shimamoto T; Uramatsu S

The properties of a new copolymer polyvinyl alcohol acrylic acid methyl methacrylate copolymer and its suitability for the manufacture of capsules for drugs are examined. Copolymer properties considered include dissolution in various fluids film strength gas permeability moisture absorption and desorption. Capsule properties considered include dissolution disintegration hardness filling dissolution absorption of indomethacin in rats and tolerance. A comparison is also made of these capsules with conventional capsules. 9 refs.

Nisshin Kasei Co.Ltd.; Daido Chemical Corp.JAPAN

Accession no. 916786

Item 269Journal of Membrane Science239, No.2, 2004, p.255PERVAPORATION STUDIES OF GASEOUS PLASMA TREATED PVA MEMBRANEUpadhyay D J; Bhat N V

A non-porous PVAl membrane was subjected to air nitrogen and oxygen plasma treatment to improve the

References and Abstracts

separation efficiency for azeotropic water-isopropanol mixtures and the permselectivity of the treated membrane investigated. Treatment time was optimised and used to study pervaporation performance over a selected water-isopropanol concentration range. The modified membranes were analysed by ATR-FTIR spectroscopy DSC and wide angle X-ray diffraction. Nitrogen plasma treatment was found to induce crosslinking on the membrane surface and to enhance separation performance.

Ulster University; Bombay Textile Research Assn.EUROPEAN COMMUNITY; EUROPEAN UNION; INDIA; UK; WESTERN EUROPE

Accession no. 916603

Item 270Journal of Sol-Gel Science and Technology30, No.1, 2004, p.49PREPARATION OF MACROPOROUS SOL-GEL BIOGLASS USING PVA PARTICLES AS PORE FORMERJie Q; Lin K; Zhong J; Shi S; Li Q; Chang J; Wang R

The synthesis of macroporous sol-gel bioglass by the addition of poly(vinyl alcohol) particles as pore former to the aqueous sol derived from tetraethoxysilane followed by heat treatment of the gel is described. The bioglass was characterised by SEM (morphology) surface area and porosity and its in vitro bioactivity was investigated by apatite layer formation in simulated body fluid using FTIR x-ray diffraction and field emission SEM. 25 refs.

Shanghai Institute of CeramicsCHINA

Accession no. 916441

Item 271Journal of Sol-Gel Science and Technology29, No.2, 2004, p.107SYNTHESIS AND CHARACTERIZATION OF POLYVINYL ALCOHOL (PVA)/SILICA HYBRID COMPOSITES DERIVED THROUGH THE SOL-GEL METHOD IN AQUEOUS MEDIUM: EFFECT OF ACID CONTENT SILICA CONTENT AND VISCOSITY OF PVA ON THE DISPERSION CHARACTERISTICS OF SILICA AND THE PHYSICAL PROPERTIES OF THE COMPOSITESKotoky T; Dolui S K

The synthesis of poly(vinyl alcohol)/silica hybrid composites of various compositions in aqueous medium using the sol-gel process by the initial formation of a stable colloidal sol from sodium silicate is described. Composite films obtained by gelation were characterised by FTIR SEM TGA tensile strength elongation at break and water uptake measurements and the results are discussed. 22 refs.

Napaam Tezpur UniversityINDIA

Accession no. 916439

Item 272Polymer International53, No.7, 2004, p.911SELECTED PROPERTIES OF PH-SENSITIVE BIODEGRADABLE CHITOSAN-POLY(VINYL ALCOHOL) HYDROGELWang T; Turhan M; Gunasekaran S

The properties of semi-interpenetrating polymer networks derived from chitosan and poly(vinyl alcohol)(PVA) with glutaraldehyde as crosslinking agent in various proportions were investigated by FTIR and fracture tests before and after swelling at different pH values. The effects of longer swelling times in acidic media on the leaching out of PVA are discussed in terms of the hydrolysis of the Schiff's base groups of the hydrogel. 25 refs.

Wisconsin-Madison University; Mersin UniversityTURKEY; USA

Accession no. 915601

Item 273Canadian Journal of Chemical Engineering81, No.3-4, 2003, p.566GAS-LIQUID-SOLID REACTIONS OF POLYVINYL ALCOHOL ON OXIDATION TREATMENTS FOR ENVIRONMENTAL POLLUTION REMEDIATIONSilva A M T; Vaz R N P; Quinta-Ferreira R M; Levec J

Polyvinyl alcohol (PVA) oxidation in liquid-phase is studied in a batch high-pressure reactor at 140 to 240 deg.C and 0.7 MPa oxygen partial pressure. The two-phase (gas-liquid) non-catalytic wet oxidation is compared with a three-phase system (gas-liquid-solid) using CuO-ZnO/Al2O3 and Mn-Ce-O oxides catalysts. Oxidation processes are shown to be quite promising technologies for industrial effluents containing PVA leading to high reductions in PVA and total organic carbon levels. Catalysts show high activity at 180 deg.C and carbon adsorption is not observed; Mn-Ce-O shows significant leaching to the liquid-phase compared with CuO-ZnO/Al2O3. Acetic and formic acids are detected as refractory compounds for oxidation. 24 refs.

Coimbra University; Ljubljana UniversityEUROPEAN COMMUNITY; EUROPEAN UNION; PORTUGAL; SLOVENIA; WESTERN EUROPE

Accession no. 915304

Item 274Macplas InternationalMay, 2004, p.21DEGRADABLE FILMS - THE ADEPT POLYVINYL ALCOHOL BINDING TAPE

Katco and Environmental Polymers are reported in this concise article to have jointly developed a polyvinyl alcohol binding tape for thermal moulding in the automotive sector. Brief details of the new tape which is known as Adept are given here.

References and Abstracts

Katco; Environmental PolymersEUROPE-GENERAL

Accession no. 914709

Item 275Polymer45, No.12, 2004, p.4037EFFECT OF SYNDIOTACTICITY ON THE MORPHOLOGY OF WATER-SOLUBLE LOW MOLECULAR WEIGHT POLY(VINYL ALCOHOL) BY SOLUTION COPOLYMERIZATION OF VINYL PIVALATE/VINYL ACETATE IN TETRAHYDROFURAN AND SAPONIFICATIONYeum J H; Ji B C; Noh S K; Jeon H Y; Kwak J W; Lyoo W S

The synthesis of low molecular weight poly(vinyl alcohol) (PVA) by solution copolymerisation of vinyl pivalate and vinyl acetate in various monomer ratios using 2,2'-azobis(2,4-dimethylvaleronitrile) as initiator with subsequent hydrolysis of the copolymer is described. The resulting PVA was characterised by molecular weight (viscosity) proton NMR (syndiotacticity) surface morphology (optical microscopy) and solubility and the results are discussed. 16 refs.

Kyungpook National University; Yeungnam University; Chonnam National UniversitySOUTH KOREA

Accession no. 914518

Item 276Plastics and Rubber Weekly2004, p.1STANELCO BANKS ON ECO BUBBLE WRAPCundy C

Stanelco is poised to make commercial breakthroughs with an environmentally friendly bubble wrap and a completely water-soluble adhesive tape. The water-soluble and biodegradable bubble wrap material is a 50:50 mix of starch and PVOH. It is said to be close in cost to conventional plastics less abrasive and holds air in the bubbles for longer. Stanelco is presently filing patents for its new adhesive tape that is claimed to be 100% water-soluble and leaves no residue. It uses a PVOH film and a soluble adhesive which subsidiary Adept Polymers has spent seven years developing.

Stanelco Products Ltd.EUROPEAN COMMUNITY; EUROPEAN UNION; UK; WESTERN EUROPE

Accession no. 914377

Item 277Journal of Applied Polymer Science92, No.3, 2004, p.1984RAMAN SPECTROSCOPIC STUDY OF CDS PVA COMPOSITE FILMS

Badr Y A; El-Kader K M A; Khafa*gy R M

The preparation of composite films of poly(vinyl alcohol) with the semi-conducting material cadmium sulphide in varying proportions and their characterisation by FT-Raman spectroscopy UV-visible-IR spectroscopy x-ray diffraction and current-voltage characteristics is described. The results are interpreted in terms of the formation of new bonds and the potential application of the material to the production of solar cells is discussed. 52 refs.

Cairo University; Suez Canal University; Cairo Ain Shams UniversityEGYPT

Accession no. 914026

Item 278Polymers and Polymer Composites12, No.3, 2004, p.235A ZONE DRAWING METHOD TO DETERMINE OPTIMUM INITIAL CONCENTRATION OF POLY(VINYL ALCOHOL) TO MAKE FILMS WITH DIFFERENT DEGREES OF SAPONIFICATIONJoon Ho Kim; Won Sik Yoon; Jeong Hyun Yeum; Byung Chul Ji; Hee Sam Kim; Han-Yong Jeon; Won Seok Lyoo

The optimum preparation conditions for atactic polyvinyl alcohol films were investigated by measuring the polymer concentration draw ratio and degree of saponification. Atactic PVA films were prepared by casting in water with different polymer concentrations. The a-PVA films were zone-drawn under various conditions. Using the optimum polymer concentration of the a-PVA/water solutions caused significant changes in the draw ratio of the films which were maximised at the initial polymer concentration but which gradually decreased at higher or lower concentrations. The birefringence degree of crystal orientation and tensile properties of a-PVA films having the same draw ratios were the highest at these optimum polymer concentrations. Optimum concentrations were reconfirmed by viscometry. Optimum conditions of the film casting of atactic PVA with various degrees of saponification were established by the zone drawing method. The agreement between the optimum concentration values obtained by zone drawing and viscometry suggests that the zone drawing method is an appropriate and convenient way to establish the optimum concentration for maximum draw ration birefringence degree of crystal orientation and tensile properties. 18 refs.

Yeungnam University; Kyungpook National University; Chonnam National UniversityKOREA

Accession no. 913441

Item 279ACS Polymeric Materials: Science and Engineering, Spring Meeting 88, 2003, p.414

References and Abstracts

STUDY ON STABILITY CU NANOPARTICLE IN PVA NANOFIBERWang C; Li Z; Yang Q; Hong Y

Hybrid materials were prepared from PVAl nanofibre and copper nanoparticles in the presence of sodium bisulphite deoxidant by electrospinning and the stability of the copper nanoparticles in the nanofibre investigated under a high voltage. It was found that the structure and properties of the nanoparticles were not affected by the high voltage and their stability in air was greatly increased. 1 refCHINA

Accession no. 912160

Item 280Polymer45, No.6, 2004, p.1895FABRICATION OF BLEND BIODEGRADABLE NANOFIBROUS NONWOVEN MATS VIA MULTI-JET ELECTROSPINNINGDing B; Kimura E; Sato T; Fujita S; Shiratori S

A series of blend biodegradable nanofibrous mats comprising poly(vinyl alcohol) (PVA) and cellulose acetate (CA) were prepared via multi-jet electrospinning using a relatively high voltage supply (20 kV). The weight ratio of PVA/CA in blend nanofibrous mats was controlled by changing the number of jets for each polymer solution. The composition of PVA and CA in the mats was determined by immersing them in water to remove the PVA component and measuring the weight loss. Morphology dispersibility and mechanical properties of the mats were examined by field emission scanning electron microscopy (FE-SEM) FTIR spectroscopy wide-angle X-ray diffraction (WAXD) and tensile testing. The blend nanofibrous mats have good dispersibility and uniform properties for each sample. Their mechanical properties were largely influenced by the weight ratio of PVA/CA in the blends. 26 refs.

Yokohama Keio University; Shiratori Nanotechnology Co.Ltd.JAPAN

Accession no. 910844

Item 281Journal of Materials Science. Materials in Medicine15, No.3, 2004, p.297EFFECTS OF PVA SPONGE CONTAINING CHITOOLIGOSACCHARIDE IN THE EARLY STAGE OF WOUND HEALINGYou Y; Park W H; Ko B M; Min B-M

Details are given of the preparation of PVAL sponges with different chitooligosaccharide content for wound-dressing applications. Morphologies were examined using SEM. The accelerating effect of the chitooligosaccharide-loaded PVAL sponge on open wound healing was investigated by macroscopic examination and measurement of wound area. 12 refs.

Chungnam National University; Kyung Hee University; Seoul National UniversityKOREA

Accession no. 910708

Item 282Journal of Polymer Science: Polymer Physics Edition42, No.5, 2004, p.800VISCOELASTIC BEHAVIORS AND MOLECULAR MOTIONS OF HIGHLY SYNDIOTACTIC POLY(VINYL ALCOHOL) FIBERSGotoh Y; Nagara Y; Nakano T; Okamoto Y; Ohkoshi Y; Nagura M

The viscoelastic behaviour and molecular motion of highly syndiotactic poly(vinyl alcohol) (PVA) fibres were investigated by dynamic mechanical thermal analysis and wide-angle x-ray diffraction in comparison with those for atactic PVA fibres. The results are discussed in terms of differences in intermolecular hydrogen bonding leading to the formation of hydrogels with high water resistance and large modulus from syndiotactic PVA without chemical crosslinking. 40 refs.

Shinshu University; Nagoya University; Nara Institute of Science & TechnologyJAPAN

Accession no. 910263

Item 283International Polymer Science and Technology30, No.8, 2003, p.T/47-50BLENDS BASED ON POLYVINYL ALCOHOL AND POLYHYDROXYBUTYRATEOl'khov A A; Iordanskii A L; Shatalova O V

This work reports on the use of blending techniques to modify the properties of materials based on polyvinyl alcohol (PVA). The structural features and properties were investigated of composites based on PVA and polyhydroxybutyrate by different methods of structural analysis. The composite blend was obtained by melt extrusion. The structure of the films was studied by differential scanning calorimetry the tensile properties of the film specimens were also tested and steam permeability was studied using special membrane cells by measuring the weight loss by the cell. Results of X-ray diffraction analysis indicate that each of the components of the blend is capable of forming an independent crystalline phase. Details are given of optimum blend ratios. 15 refs. (Article translated from Plasticheskie Massy No. 12 2002 pp.20-2).

Lomonosov M.V.Academy of Fine Chemical Technology; Russian Academy of SciencesRUSSIA

Accession no. 908735

References and Abstracts

Item 284Polymer45, No.5, 2004, p.1599OXYGEN BARRIER PROPERTIES OF BIAXIALLY ORIENTED POLYPROPYLENE/POLYVINYL ALCOHOL BLEND FILMSJang J; Lee D K

A biaxially oriented polypropylene/poly(vinyl alcohol) (PP/PVA) blend film was prepared that had an oxygen-barrier property that was about 130 times that of biaxially oriented PP (BOPP) film. When the PVA-PP viscosity ratio decreased the dispersed PVA phase developed into platelets during the stretching process. The oxygen permeability depended on the number and size of the PVA platelets. Optimal amounts of plasticiser and initiator were required to give the best barrier properties. An initiator played the role of a compatibiliser. The oxygen barrier was enhanced by increasing the viscosity of the PP and the draw ratio. A higher viscosity of PP was advantageous for preventing delamination of the blend film and the moisture vapour permeability was unaffected by the laminar structure. Biaxially oriented PP/PVA blend film is a potential substitute for PVDC-coated BOPP film. 18 refs.

Seoul National UniversitySOUTH KOREA

Accession no. 908133

Item 285Journal of Applied Polymer Science91, No.3, 2004, p.1612PREPARATION AND CHARACTERIZATION BY RADIATION OF HYDROGELS OF PVA AND PVP CONTAINING ALOE VERAK R Park; Y C Nho

Gelation gel strength water absorption and degree of water evaporation from hydrogels prepared from a blend of polyvinyl alcohol and polyvinyl pyridine mixed with Aloe vera were examined to determine the relative value of the various materials for use in wound dressings. Polymerisation methods for the hydrogels included freeze-thaw gamma-ray irradiation or a two-step combination of these. Gel content and strength was inversely affected by increasing amounts of Aloe vera and increasing radiation dose. Degree of swelling reduced with increasing gel strength and content. Wound healing properties were evaluated and found to be improved compared to commercial products. 10 refs.

Korea Atomic Energy Research InstituteKOREA

Accession no. 907415

Item 286Paint and Coatings Industry20, No.3, 2004, p.70/7

PHOTOCURING OF WATERBORNE LATEX PAINTS UNDER SUN AND VISIBLE-LIGHT SOURCESBurget D; Bibaut-Renauld C; Fouassier J P; Varelas C G; Charalambopoulou G Ch; Ryrfors L O; Karlsson O J

By using alpha-diketones and especially camphorquinone white pigmented waterborne latex formulations based on acrylates or vinyl acetate for outdoor/indoor paints can be cured under visible light including sunlight. The cured paint showed an excellent solvent resistance towards THF and the light-cured paints exhibit a hardness up to 30% higher than comparable VOC-containing paints. The light-curable paints can be produced by simply replacing the VOC by a photocurable composition which will simplify their industrial acceptance. 3 refs.

Mulhouse Ecole Nationale Superieure de Chimie; Interchem Hellas SA; Celanese Emulsions Norden ABEUROPEAN COMMUNITY; EUROPEAN UNION; FRANCE; GREECE; SCANDINAVIA; SWEDEN; WESTERN EUROPE

Accession no. 907154

Item 287Air Products Polymers LP, 2003WET ADHESION MONOMER AND DERIVED COPOLYMERS FOR LATEX PAINTSPinschmidt J R K; Yacoub K; Daniels C L; Phung K V

The reaction of unsaturated carbonates such as vinyl ethylene carbonate with N-aminoethylimidazolidone (TAM) under mild conditions generates a mixture of two vinyl and hydroxy functional imidazolidone carbamates which polymerise readily to acrylate or vinyl acetate based emulsion polymers. The polymers show enhanced wet adhesion (wet scrubbability) in latex paints and coatings.USA

Accession no. 906259

Item 288Polymer Testing23, No.1, 2004, p.17PREPARATION SURFACE MODIFICATION AND CHARACTERISATION OF SOLUTION CAST STARCH PVA BLENDED FILMSJayasekara R; Harding I; Bowater I; Christie G B Y; Lonergan G T

Details are given of the preparation of PVAL starch and glycerol blends. The blend containing 20% PVAL was modified by the application of chitosan to the surface. The blend and its modified form were characterised by atomic force microscopy X-ray diffraction FTIR contact angle measurements carbon-13C-NMR and SEM. 23 refs.

Swinburne University of TechnologyAUSTRALIA

Accession no. 905987

References and Abstracts

Item 289Polymer44, No.26, 2003, p.8139PLASTICIZER EFFECT ON THE MELTING AND CRYSTALLIZATION BEHAVIOR OF POLYVINYL ALCOHOLJyongsik Jang; Dong Kweon Lee

The effect on melting and crystallisation behaviour of the addition of glycerol as a plasticiser to four different grades of polyvinyl alcohol (PVA) was studied using differential scanning calorimetry. PVA samples were either fully or partially hydrolysed and of different viscosities. At higher hydrolysis levels crystallisation peak temperature was reduced crystallisation rate slowed and crystallite size distribution widened with plasticiser addition but effects on crystallisation behaviour of partially hydrolysed PVA were minimal. In contrast the thermal history was seen to affect partially hydrolysed materials but not the fully hydrolysed samples. Melting point reduction with increasing plasticiser levels was observed in all cases. Effects of plasticiser addition were much reduced when phase separation occurred between glycerol and PVA. Blend systems of fully and partially hydrolysed PVA polymers were also examined and were seen to have twin melting temperatures and concurrent crystallisation. 20 refs.

Seoul National UniversitySOUTH KOREA

Accession no. 905465

Item 290Chemical Engineering Research and Design81, No.A10, 2003, p.1385EFFECTS OF DEGREE OF FORMALDEHYDE ACETAL TREATMENT AND MALEIC ACID CROSSLINKING ON SOLUBILITY AND DIFFUSIVITY OF WATER IN PVA MEMBRANESHan B; Li J; Chen C; Xu C; Wickramasinghe S R

The sorption desorption and solubility of water vapour and liquid in poly(vinyl alcohol) (PVA) membranes treated by formaldehyde were compared with those for PVA membranes with various degrees of maleic acid crosslinking and the results discussed in terms of the effects of structural differences on the diffusivity and solubility of water molecules. Experimental results are considered in terms of the common pervaporation models. 28 refs.

Tsing Hua University; Colorado State UniversityCHINA; USA

Accession no. 904677

Item 291Journal of Applied Polymer Science90, No.14, 2003, p.3912EFFECT OF MEMBRANE MORPHOLOGY IN PERVAPORATIVE SEPARATION OF ISOPROPYL ALCOHOL-AROMATIC

MIXTURES: A THERMODYNAMIC APPROACH TO MEMBRANE SELECTIONMandal S; Pangarkar VP

The separation of isopropyl alcohol (IPA)-benzene and IPA-toluene azeotropic mixtures by pervaporation through several polymeric hydrophilic membranes of various solubility parameters such as regenerated cellulose poly(vinyl alcohol) (PVA) cellulose acetate (CA) cellulose diacetate (CDA) and cellulose triacetate (CTA) was studied over the entire composition range at 30 deg C. Some of these membranes gave a gradual shift in the azeotropic point which depended on the solubility parameter and the solute-polymer interaction parameter. Regenerated cellulose film gave the best pervaporation performance in terms of selectivity to IPA and durability. PVA showed a high selectivity with a reasonable flux. Poly(dimethylsiloxane) was also studied as an aromatic selective membrane. 41 refs.

Mumbai UniversityINDIA

Accession no. 904587

Item 292Journal of Applied Polymer Science90, No.14, 2003, p.3848INFLUENCES OF INDIVIDUAL AND COMPOSED POLY(VINYL ALCOHOL) SUSPENDING AGENTS ON PARTICLE MORPHOLOGY OF SUSPENSION POLY(VINYL CHLORIDE) RESINYong-Zhong Bao; Jian-Gang Liao; Zhi-Ming Huang; Zhi-Xue Weng

Effects of individual and composite poly(vinyl alcohol) (PVA) suspending agents on the particle morphology of poly(vinyl chloride) (PVC) resins were investigated and discussed in relation to PVA absorption at the oil/water interface and interfacial behaviour. The percentage and surface coverage of PVA at the oil/water interface decreased with increasing degree of hydrolysis (DH) of PVA in the DH range 70-98 mol % whereas the interfacial tension of VC/PVA aqueous solution increased linearly with increasing DH of the PVA. PVC resin with more-regular particle shape increased agglomeration and fusion of primary particles lower porosity and higher bulk density was prepared by using PVA with a higher DH as a suspending agent. This was caused by drop coalescence at the very early stages of VC polymerisation an increase in particle shrinkage and a lower colloidal protection to primary particles. The interfacial tension of VC/water varied linearly with the weight composition of the composite PVA suspending agents. The particle properties of PVC resin prepared by using the composite PVC suspending agents were usually intermediate between the properties of PVC resins prepared by using the corresponding individual PVA suspending agent. The particle morphology and properties of PVC resin could be controlled by a suitable choice of the composite PVA

References and Abstracts

suspending agents. 21 refs.

Zhejiang UniversityCHINA

Accession no. 904579

Item 293Synthetic Metals135-6, 2003, p.447ELECTRICAL PROPERTIES OF PVA/PPY BLENDSde Oliveira H P; dos Santos M N B; dos Santos C G; de Melo C P

A dielectric study of polymeric blends composed by polypyrrole (PPY) incorporated into a matrix a polyvinyl alcohol (PVA) containing ferric chloride (FeCl3) is presented. The PPY conducting regions are formed inside the matrix by in situ polymerisation after the (PVA+FeCl3) matrix is exposed to the vapour of the monomer. The mixed dielectric/conducting characteristics of the resulting blend are conveniently characterised by dielectric spectroscopy and in this manner both the charge transport and charge storing processes can be followed. The ways in which the temperature variation in the 300-24 K range affects the electrical behaviour of the material are also examined. 4 refs.

Pernambuco Universidade FederalBRAZIL

Accession no. 904082

Item 294Macromolecular Rapid Communications24, No.12, 2003, p.715POLY(VINYL ALCOHOL)-ENCAPSULATED HYDROPHILIC CARBON BLACK NANOPARTICLES FREE FROM AGGREGATIONLi H-Y; Chen H-Z; Sun J-Z; Cao J; Yang Z-L; Wang M

Carbon black (CB) nanoparticles are encapsulated by polyvinyl alcohol (PVA) by a simple method of coacervation. Transmission electron microscopy (TEM) images clearly demonstrate that the successful encapsulation of PVA happens at the surfaces of CB nanoparticles. Particle size distribution measurements indicate that the diameters of the obtained PVA-encapsulated CB (CB at PVA) nanoparticles are distributed within the nanoscale dimension. This strategy avoids the complicated polymerisation process involved in the counterpart of polymer-coating approaches. 7 refs.

Accession no. 903875

Item 295Journal of Applied Polymer Science89, No.5, 2003, 890ELECTROACTIVE CHARACTERISTICS OF INTERPENETRATING POLYMER NETWORK HYDROGELS COMPOSED OF POLY(VINYL

ALCOHOL) AND POLY (N-ISOPROPYLACRYLAMIDE)Seon Jeong Kim; Sang Jun Park; Sang Min Lee; Young Moo Lee; Hee Chan Kim; Sun I Kim

An interpenetrating polymer network (IPN) composed of poly(vinyl alcohol) (PVA) and poly(N-isopropylacrylamide) (PNIPAAm) was prepared by the sequential IPN method. The equilibrium swelling ratio and bending behaviour under an electric fields were measured in aqueous NaCl. The IPN exhibited a high equilibrium swelling ratio in the range 280-380%. When the IPN in aqueous NaCl solution was subjected to an electric field the IPN showed significant and rapid bending toward the cathode. The IPN hydrogel also showed stepwise bending behaviour depending on the electric stimulus. In addition the ionic conductivity of the IPN hydrogel was measured using dielectric analysis and its conductive behaviour followed the Arrhenius equation. The conductivity of the IPN hydrogel and the activation energy for the form of the IPN were 0.0000168 S/cm at 36C and 61.0 kJ/mol respectively. 22 refs.

Hanyang University; Seoul National UniversityKOREA

Accession no. 903720

Item 296Journal of Polymer Science: Polymer Physics Edition41, No.23, 2003, p.3127INFLUENCE OF THE SURFACE CHEMISTRY ON THE STRUCTURAL AND MECHANICAL PROPERTIES OF SILICA-POLYMER COMPOSITESBoisvert J-P; Persello J; Guyard A

Composite films of poly(vinyl alcohol) (PVA) filled with nanometric monodisperse or spherical silica particles were prepared by the mixing an aqueous PVA solution with a colloidal suspension of silica and then evaporating the solvent. The interaction between the PVA and the silica was controlled by adjusting the solution pH to 5 or 9. Adsorption isotherms showed a higher PVA/surface affinity at the lower pH. This interaction affected the structure of the composite and the particle distribution within the polymer matrix: this was investigated by small-angle neutron scattering electron microscopy and swelling measurements. Most of the mechanical properties could be related to the distribution of clusters within the polymer matrix. The progressive creation of a cluster network within the polymeric matrix with increasing silica volume fraction reduced the extensibility or swelling capacity of the composite. The effect was more acute at a higher pH where the surface interaction with PVA was weaker and promoted interconnection of clusters. refs.

QUEBEC UNIVERSITE A TROIS-RIVIERES; FRANCHE-COMTE UNIVERSITECANADA; EUROPEAN COMMUNITY; EUROPEAN UNION; FRANCE; WESTERN EUROPE

Accession no. 902007

References and Abstracts

Item 297Journal of Applied Polymer Science84, No.6, 2002, p.1295CUT-OUT FILTER FOR ULTRAVIOLET RADIATION FROM POLY(VINYL ALCOHOL)Abd El-Kader K M; El-Lawindy Y M; Mansour A F; Abdel Hamied S F

The effects of UV radiation and thermal annealing on the optical and mechanical properties of polyvinyl alcohol (PVA) were studied. Pure PVA samples were prepared by casting and a xenon arc lamp used to irradiate the sample. The irradiated PVA sample was heated at 150C for 2 hours. The optical and mechanical properties of original irradiated and irradiated and then heated samples were measured. The irradiated and then heated sample showed lower transmission in the wavelength range from 190 to 320 nm and the transmission was higher in the visible region than the original and irradiated samples. Stress-strain measurements were performed. The modulus of elasticity of the double-treated sample was approximately four times higher than that of the original sample and the results showed that this sample could be used as a cut-out filter for UV radiation. 21 refs.

Suez Canal University; Zagazig UniversityEGYPT

Accession no. 901879

Item 298Polymer Preprints.2003, 44, No.1, p.402WHEAT PROTEIN AND ITS POLYMER BLENDS STUDIED BY SOLID-STATE HIGH-RESOLUTION NMR SPECTROSCOPYXiaoqing Zhang; Burgar I; My Dieu Do; Lourbakos E; Beh H

High resolution nuclear magnetic resonance spectroscopy was used to investigate the chemical structures intermolecular interactions and molecular motions concerned with the miscibility of blends of wheat protein and polyvinyl alcohol (PVOH) with between 0 and 25 percent PVOH content. Both solution casting and thermal processing methods were used to prepare blends of PVOH and wheat protein plasticised using glycerol and water. Semi miscible blends were formed using solution casting methods when PVOH content was less than 20 percent but thermally processed blends showed greater heterogeneity. Examination on the nanometre scale also indicated heterogeneity. 8 refs.AUSTRALIA

Accession no. 901105

Item 299Polymer Bulletin50, No.5-6, 2003, p.367

WATER-SOLUBLE TEMPERATURE-RESPONSIVE POLY(VINYL ALCOHOL-CO-VINYL ACETAL)SChristova D; Ivanova S; Ivanova G

In order to obtain novel polyvinyl alcohol (PVA) is chemically modified by introducing cyclic acetal functionalities in the polymer chain. The acetalisation reaction is carried out with acetaldehyde in water. The degree of acetalisation is controlled in the range 10-25% by the initial aldehyde concentration. The copolymers obtained are characterised by 1D (1H 13C DEPT) and 2D (COSY) NMR techniques as well as by viscometry. The thermo-responsive properties are evaluated by measuring the cloud point temperature (Tcp) of the aqueous copolymer solutions. 15 refs.

Bulgarian Academy of SciencesBULGARIA; EASTERN EUROPE

Accession no. 901098

Item 300Flexible2, No.4, 2003, p.16EXPLOSIVE PLASTICSAnyadike N

Ethylene vinyl alcohol (EVOH) and polyvinyl alcohol (PVOH) are the two main water-soluble polymer types commercially available. Films cast from water solutions of PVOH and plasticiser are transparent tough tear- and puncture-resistant. Such films are used for hospital laundry bags that can be loaded directly into the washing machine without the need for contents handling. EVOH acts by completely blocking the permeable barrier unlike many other traditional plastic materials which allow oxygen ingress. It is able to extend the shelf life of food items with EVOH copolymers characterised by their outstanding gas barrier properties resistance to solvents chemicals and hydrocarbons and excellent barrier to odour and flavour permeance. Nippon Gohsei is constructing a new EVOH facility in the UK. The 15000 t/y plant which will produce Soarnol is expected to be fully operational in early 2004. EVAL Europe has also undertaken steps to expand production capacity at its site at the Antwerp Chemical complex from 12000 to 24000 t/y.WORLD

Accession no. 900984

Item 301Journal of Materials Science Letters22, No.18, 2003, p.1291EFFECT OF DEGREE OF POLYMERIZATION ON SYNTHESIS OF ANORTHITE-TYPE POWDER BY WET-CHEMICAL METHOD EMPLOYING PVALee S J; Lee M H

References and Abstracts

Anorthite powder was synthesised from calcium nitrate aluminium nitrate and silica sol by the PVAl steric entrapment route. The effects of the degree of polymerisation and content of PVAl on the crystallisation behaviour specific surface area particle size distribution and primary crystalline size of the powder were examined. Both polyvinyl alcohol content and degree of polymerisation were found to have a marked influence on the synthesis and properties of the powder. 14 refs.

Mokpo National University; Korea Institute of Ceramic Engineering & TechnologyKOREA

Accession no. 899920

Item 302International Journal of Polymer Analysis and Characterization8, No.5, 2003, p.339SYNTHESIS CHARACTERIZATION AND SOLUTION PROPERTIES OF ACRYLIC ESTER POLYMERSMathakiya I; Raksh*t A K; Rao P V C

hom*opolymers of vinyl acetate and various acrylates and copolymers thereof were synthesised by free-radical solution polymerisation and copolymerisation and characterised by FTIR spectroscopy NMR spectroscopy TGA GPC and viscosity measurements. Reactivity ratios of monomers in the vinyl acetate-acrylate copolymers were computed from NMR spectroscopic data using the Fineman-Ross and Kelen-Tudos methods. The voluminosity shape factor activation parameters of viscous flow root-mean-square end-to-end distance radius of diffusing particle and diffusion coefficients were also computed at various temperatures to establish the solution properties of the polymers and copolymers. 31 refs.

Baroda MS University; Indian Petrochemical Corp.Ltd.INDIA

Accession no. 899907

Item 303Journal of Applied Polymer Science90, No.6, 2003, p.1477PREPARATION AND CHARACTERIZATION BY RADIATION OF POLY(VINYL ALCOHOL) AND POLY(N-VINYLPYRROLIDONE) HYDROGELS CONTAINING ALOE VERAKyoung Ran Park; Young Chang Nho

Hydrogels for wound dressings were made from a mixture of Aloe vera and poly(vinyl alcohol) (PVA)/poly(N-vinylpyrrolidone) (PVP) by freezing and thawing gamma-ray irradiation or a two-step process of freezing and thawing and gamma-ray irradiation. Physical properties were measured including gelation water absorptivity gel strength and degree of water evaporation to evaluate the applicability of these hydrogels for wound dressings. The PVA:PVP ratio was 6:4 the dry weight of Aloe vera was

in the range 0.4-1.2wt% and the solid concentration of the PVA/PVP/Aloe vera solution was 15wt%. Mixtures of PVA/PVP/Aloe vera were exposed to gamma radiation doses of 25 35 and 50 kGy to evaluate the effect of radiation dose on the physical properties of the hydrogels. Gel content and gel strength increased as the concentration of Aloe vera in the PVA/PVP/Aloe vera gels decreased and as radiation dose increased and the number of freeze thaw cycles was increased. The swelling degree was inversely proportional to the gel content and gel strength. The PVA/PVP/Aloe vera hydrogel had a better curing effect than no dressing an a commercial urethane membrane. 13 refs.

Korea Atomic Energy Research InstituteKOREA

Accession no. 899622

Item 304Journal of Applied Polymer Science90, No.6, 2003, p.1471WATER TRANSPORT STRUCTURE FEATURES AND MECHANICAL BEHAVIOR OF BIODEGRADABLE PHB/PVA BLENDSOlkhov A A; Vlasov S V; Iordanskii A L; Zaikov G E; Lobo V M M\

Blends of biodegradable poly(3-hydroxybutyrate) (PHB) with biocompatible and water-soluble poly(vinyl alcohol) (PVA) were prepared by extrusion. The structure of the blends was studied by wide angle X-ray diffraction and DSC. Water vapour permeation and tensile properties of the blends were measured. The materials appeared to be partially miscible up to PHB contents of between 20-30% by weight above which a phase inversion takes place and mechanical properties drop to values characteristic of pure PHB. Water permeability goes through a maximum at PHB contents around 40% by weight. These materials are of interest as novel biodegradable films and coatings for biomedical agricultural and packaging applications. 22 refs.

Moscow Institute Of Chemical Physics; Coimbra UniversityRUSSIA

Accession no. 899621

Item 305Macromolecular SymposiaNo.197, 2003, p.143CHARACTERISTICS AND DEGRADATION OF HYBRID COMPOSITE FILMS PREPARED FROM PVA STARCH AND LIGNOCELLULOSICSCinelli P; Chiellini E; Gordon S H; Imam S H

Details are given of the preparation of cast films by blending orange fibres and PVAL with and without corn starch. Films were also prepared by crosslinking PVAL starch and orange fibres with hexamethoxymethylmelamine. Films were evaluated for their thermal stability water permeability and biodegradation. A possible stimulating

References and Abstracts

effect of lignocelluloses fillers on the biodegradation of PVAL in blends was observed. 21 refs.

Pisa University; US Dept. of AgricultureEUROPEAN COMMUNITY; EUROPEAN UNION; ITALY; USA; WESTERN EUROPE

Accession no. 897890

Item 306EP 1347107 A1 20030924POLYVALENT INSULATING ANTI-VIBRATORY ADHESIVE AND FIREPROOF PRODUCT FOR VARIOUS INDUSTRIAL SECTORS ESPECIALLY THE BUILDING INDUSTRYBonacini V

The product is suitable for use in cladding facades weatherproofing for roofing thermal and/or acoustic insulation preventing damp and efflorescence of salts absorbing vibration encapsulating elements protecting structures and elements against fire as a means of coating backings for making carpets preventing filtration elasticising and binding loose carrier materials lining gutters conduits and piping adhesives for solid materials and expansion joints. It comprises 10 to 49% acrylic resin 20 to 28% polyvinyl acetate 1 to 8% vegetable 10 to 20% water 0 to 12% cork particles 1 to 4% sodium hydroxide 0 to 58% pigment and 0 to 5 % cellulose glue.

EUROPEAN COMMUNITY; EUROPEAN UNION; SPAIN; WESTERN EUROPE; WESTERN EUROPE-GENERALAccession no. 897360

Item 307Polymer Degradation and Stability81, No.3, 2003, p.393NUMERICAL SIMULATION FOR ENZYMATIC DEGRADATION OF POLY(VINYL ALCOHOL)Watanabe M; Kawai F

The enzymatic degradation of polymeric compounds is studied. A mathematical model is proposed that governs the temporal change of the weight distribution with respect to the molecular weight. A particular case is investigated in which the molecules are degraded randomly and a technique to solve the inverse problem to determine the degradation rate numerically is developed. The technique is illustrated with an example in which GPC profiles of polyvinyl alcohol are introduced into the numerical computation. PVA is degraded by random oxidation of hydroxyl groups and following cleavage of carbon-carbon chain between two carbonyl groups/a carbonyl group and an adjacent hydroxymethine group either by hydrolase or aldolase. 10 refs.

Okayama UniversityJAPAN

Accession no. 896991

Item 308International Journal of Polymeric Materials52, No.7, 2003, p.623EFFECT OF CHEMICAL CROSSLINKING ON SWELLING PARAMETERS OF MODIFIED POLY(VINYL ALCOHOL) HYDROGELAtta A M; El-Ghazawy R A M

Graft copolymerisation of maleic anhydride (MA) onto partially and fully hydrolysed polyvinyl alcohol PVA is carried out in presence and in absence of an initiator. The structural features of these grafts are confirmed by 1H-NMR analysis. 1H-NMR analysis is also used to determine the percentage of grafting. These grafts are crosslinked using different concentrations of either 111-trimethylolpropane trimethacrylate (TPT) or methylene bisacrylamide (MBA) as hexa- or tetra-functional crosslinker respectively. The crosslinkers concentrations range from 1 to 30% (wt.%) based on the total weight of grafts. The final water content volume fraction of the polymer and swelling capacity are determined for all grafts. The effect of MBA and TPT crosslinkers structure on swelling properties of both partially and fully hydrolysed PVA grafts are also determined. 30 refs.

Egyptian Petroleum Research InstituteEGYPT

Accession no. 896962

Item 309ACS Polymeric Materials: Science and Engineering, Fall Meeting 87, 2002, p.502POLYMER PARTICLES STABILIZED IN THE PRESENCE OF POLY VINYL ALCOHOLZecha H

The effect of grafted or adsorbed surface layers of polyvinyl alcohol (PVOH) on the stability of polymer latices is investigated and the results are briefly described. An equation is presented to calculate delta the hydrodynamic effective thickness of the PVOH layer in dilute latices from the viscosity total particle volume fraction adsorbed/grafted PVOH fraction and PVOH volume fraction with respect to the particles. The equation was in good accordance with empirical results. Delta was shown to increase with the molecular weight of PVOH. Delta was also observed to be greater in styrene-acrylic copolymer latices than in polyvinyl acetate (PVAC) latices. It is reported that in more concentrated latices the assumption that that the fraction of adsorbed/grafted PVOH is independent of the latex concentration is untrue and that in PVAC latices the PVOH fraction is strongly dependent on the latex concentration. It is argued that all of these results imply that the stabilisation of latices by PVOH is not simply a steric effect and that the concentration dependence of latex viscosity cannot be described solely on the basis of effective hydrodynamic volume fraction. 14 refs.

References and Abstracts

EUROPEAN COMMUNITY; EUROPEAN UNION; GERMANY; WESTERN EUROPE

Accession no. 896836

Item 310International Polymer Science and Technology30, No.6, 2003, p.T/44INFLUENCE OF TEMPERATURE EFFECTS ON THE STRUCTURE AND PHYSICO-MECHANICAL PROPERTIES OF FILLED GELS OF POLYVINYL ALCOHOLUkhartseva I Y

An investigation is reported that shows that filled PVA gels formed under different production conditions can be used as the basis for creating materials with controllable properties. Such materials can be applied to drug-containing therapeutic systems that are capable of controlled release of the medicine into the surrounding medium. The influence is examined of the schedules for forming filled PVA gels on their structure and physicomechanical characteristics. The investigation was carried out on PVA medical gelatin proteolytic enzyme papain medical collagen and sodium salt of carboxymethyl cellulose. Films were obtained from the composites by casting and were formed at a temperature of 293 K and under low-temperature conditions at a temperature of 267 K for 24 hours. Specimens prepared in this way were used to study physicomechanical characteristics and to determine structural parameters. 21 refs. (Article translated from Plasticheskie Massy No.8 2002 pp.15-7).

Belarus Academy of SciencesBELARUS; BELORUSSIA

Accession no. 896786

Item 311Polymer44, No.15, 2003, p.4075EFFECTS OF CONONSOLVENCY ON GELATION OF POLY(VINYL ALCOHOL) IN MIXED SOLVENTS OF DIMETHYL SULFOXIDE AND WATERTakahashi N; Kanaya T; Nishida K; Kaji K

The rates of gelation and phase separation of polyvinyl alcohol (PVA) solutions in mixtures of dimethyl sulphoxide (DMSO) and water at 25 deg.C are studied and it is found that both the rates show a maximum at a volume fraction of DMSO thetaDMSO = 0.60 while gelation is not observed either in pure DMSO or pure water suggesting that water-DMSO is a cononsolvent system for PVA. On the basis of the data by Cowie it is concluded that the 1:2 stable complex between one DMSO molecule and two water molecules is the main cause of this cononsolvency. 19 refs.

Kyoto University JAPAN

Accession no. 895244

Item 312JIS K6808. POLYVINYL ACETATE EMULSION ADHESIVES FOR WOODS Version 94 (R2001).

Japanese Standards AssociationJAPAN

Accession no. 895201

Item 313JIS K6725. TESTING METHOD FOR POLYVINYL ACETATE Version 77(R2002).

Japanese Standards Association Photocopies and loans of this document are not available from Rapra.JAPAN

Accession no. 895190

Item 314Iranian Journal of Polymer Science and Technology16, No.1, 2003, p.13STUDY OF THE EFFECT OF ACETIC ACID AND POLYETHYLENE GLYCOL ON MORPHOLOGY AND PERFORMANCE OF POLYVINYL ALCOHOL MEMBRANEMadaeni S S; Semsarzadeh M A; Moghaddasi S P; Nomani H

The effects of acetic acid and polyethylene glycol (PEG) on morphology and characteristics studies of polyvinyl alcohol (PVA) membrane are investigated. The membranes are prepared using phase inversion technique. For membrane manufacture a dope containing PVA water and either acetic acid or PEG is prepared. The dope is moulded by casting and floated in a precipitation bath containing Na2SO4/NaOH/H2O. The results show that addition of acetic acid or PEG to PVA will change the mechanism of membrane preparation leading to changes in the membrane's morphology and characteristics. Increasing the acetic acid concentration results in reduction in skin layer thickness and increase of its sub-layer thickness porosity and pore size. Reduction in skin layer thickness and porosity results in higher permeability and better membrane performance. This may be explained due to the higher concentration of H3O+ in polymer dope resulting from an increase in acetic acid concentration. Higher concentrations of positive ions facilitate the non-solvent entrance from precipitation bath to polymer dope resulting in a higher rate for acid-base equilibrium. PEG is a polar and hydrophilic polymer which performs as an electrolyte in polymer solution. Higher concentration of PEG results in a higher rate of non-solvent entrance from precipitation bath to polymer dope. In comparison with acetic acid PEG shows lower effect on membrane performance (permeability) reduction of skin layer thickness and increase in sub-layer thickness.

Razi University; Tarbiat Modarres University; Kermanshah University of Medical Sciences

References and Abstracts

IRAN

Accession no. 895024

Item 315Iranian Polymer Journal12, No.2, 2003, p.139POLY(VINYL ALCOHOL)-CHITOSAN BLENDS: PREPARATION MECHANICAL AND PHYSICAL PROPERTIESBahrami S B; Kordestani S S; Mirzadeh H; Mansoori P

Polyvinyl alcohol-chitosan blend films are prepared by casting the respective polymer solutions. The glutaraldehyde is used as a crosslinking agent. A series of PVA-chitosan blends is prepared by varying the ratio of the constituents. Mechanical and physical properties of blended films such as tensile properties in the dry and wet states water uptake surface tension and contact angle are characterised. Blending PVA and chitosan improves strength and flexibility of the films in the dry and wet states. Crosslinking with glutaraldehyde improves tensile strength and decreases elongation of the films. PVA content in the blends increases water uptake while crosslinking the films with glutaraldehyde causes less hydrophilicity. Water uptake in PVA-chitosan blends can be controlled by variation of their contents crosslinking agent and the pH of solution. Blending of PVA and chitosan improves bulk and surface hydrophilicity of blended films. 29 refs.

Amirkabir University; Tehran University of Medical ScienceIRAN

Accession no. 895021

Item 316Journal of Polymers and the Environment11, No.1, 2003, p.7STARCH POLY(LACTIC ACID) AND POLY(VINYL ALCOHOL) BLENDSKe T; Sun X S

Research on biogradable materials has been stimulated due to concern regarding the persistence of plastic wastes. Blending starch with polylactic acid (PLA) is one of the most promising efforts because starch is an abundant and cheap biopolymer and PLA is biodegradable with good mechanical properties. Polyvinyl alcohol (PVOH) contains unhydrolytic residual groups of acetate and also has good compatibility with starch. It is added to a starch and PLA blend (50:50 w/w) to enhance compatibility and improve mechanical properties. PVOH (Mw 6000) at 10% 20% 30% 40% 50% (by weight) based on the total weight of starch and PLA and 30% PVOH at various molecular weights (mw 6000. 25000 78000 and 125000 daltons) are added to starch/PLA blends. PVOH interacts with starch. At proportions greater than 30% PVOH form a continuous phase with starch. Tensile strength of the starch/PLA blends increases as PVOH concentration increases up to 40% and decreases as PVOH molecular weight increased.

The increasing molecular weight of PVOH slightly affects water absorption. Effects of moisture contents on the starch/PLA/PVOH blend are also explored. The blend containing gelatinised starch has higher tensile strength. However gelatinised starch also results in increased water absorption. 21 refs.

Kansas State UniversityUSA

Accession no. 894980

Item 317ACS Polymeric Materials Science and Engineering, Spring Meeting 86, 2002, p.263EFFECTS OF DISSOLVING TEMPERATURE AND CONCENTRATION ON THE RHEOLOGICAL PROPERTIES OF POLY(VINYL ALCOHOL)(PVA) SOLUTIONS IN DIMETHYL SULFOXIDE(DMSO)Hak Sung Kim; Dong Wook Chae; Byoung Chul Kim

Studies of the above effects were conducted in order to determine the optimal conditions for solution spinning of PVAl. The PVAl solution was found to be significantly affected by the concentration and dissolving temperature. With increasing concentration intermolecular hydrogen bonding and entanglement were increased. PVAl solutions of high concentrations had long relaxation time and could form an oriented structure at low frequency. It was however difficult to obtain fully extended chain of high modulus and strength PVAl fibre due to the high density of hydrogen bonding and entanglements. A PVAl solution dissolved at 120C had higher viscosity and stronger elastic properties than that dissolved at below 100C. 4 refs.KOREA

Accession no. 893206

Item 318Journal of Applied Polymer Science89, No.2, 2003, p.349SYNTHETIC ABSORBENT FOR DYESTUFFS BASED ON GAMMA CROSSLINKED POLY(VINYL ALCOHOL) (PVA)Ibrahim S M

The characterisation and uses of gamma radiation-crosslinked polyvinyl alcohol (PVA) films as absorbents for different classes of dyestuffs normally released from textile factors are reported. Dye stuffs are selected from different producers. These dyestuffs are Remacryl Blue (basic dye) Remazol Golden Orange (reactive dye) Solar Orange (direct dye) and Sandolan (acid dye). The percentage dye sorption by PVA is determined by spectroscopic and colour-strength measurements of the PVA films after absorbing the different dyestuffs. The results show that the concentration of dimethylbisacrylamide as a crosslinking agent has a great effect on the gel fraction and percentage swelling in water of the PVA polymer. In general crosslinked PVA

References and Abstracts

shows a low tendency to absorb the different dyestuffs under investigation at room temperature. This tendency is shown to increase with an increasing temperature of the dye solution from room temperature to 70 deg.C. Meanwhile the highest percentage of dye sorption is found in the case of the basic dye and the lowest one in the case of the reactive dye depending on the active groups on the dyes. The percentage dye sorption by PVA is slightly higher in the acid medium rather than in the alkaline one. 12 refs.

Egypt National Centre for Radiation Res.& Technol.EGYPT

Accession no. 892896

Item 319US 6590013 B1 20030708HARDENER FOR USE IN-UREA-FORMALDEHYDE AND UREA-MELAMINE-FORMALDEHYDE BASED ADHESIVESAndersen B; Brehmer B G

A hardener for use in urea-formaldehyde and urea-melamine-formaldehyde based adhesives comprises a polyvinyl acetate emulsion together with a metal chloride and an ammonium salt. The adhesive composition comprises a urea-formaldehyde or urea-melamine-formaldehyde resin and the hardener provides an increased cure rate an acceptable viscosity better adhesion and greater tolerance towards substrate type.DENMARK; EUROPEAN COMMUNITY; EUROPEAN UNION; SCANDINAVIA; USA; WESTERN EUROPE

Accession no. 892875

Item 320Colloid and Polymer Science281, No.6, 2003, p.580POLY(VINYL ALCOHOL)/POLY(N-ISOPROPYL-ACRYLAMIDE) SEMI-INTERPENETRATING POLYMER NETWORK HYDROGELS WITH RAPID RESPONSE TO TEMPERATURE CHANGESZhang J-T; Cheng S-X; Zhuo R-X

A series of thermosensitive and fast-response polyvinyl alcohol (PVA)/poly(N-isopropylacrylamide (PNIPA) hydrogels are prepared by incorporating PVA into crosslinked PNIPA to form a semi-interpenetrating polymeric network (semi-IPN). Compared to the conventional PNIPA hydrogel the semi-IPN hydrogels thus prepared exhibit significantly faster response rates and undergo full de-swelling in 1 min (lose about 95% water within 1 min) when the temperature is raised above their lower critical solution temperature and have larger equilibrium swelling ratios at room temperature. These improved properties are attributed to the incorporation of PVA which forms water-releasing channels and results in increased hydrophilicity into the PNIPA hydrogel networks. 20 refs.

Wuhan UniversityCHINA

Accession no. 892810

Item 321Journal of Applied Polymer Science89, No.6, 2003, p.1573PREPARATION AND CHARACTERIZATION OF MOLYBDOSILICIC ACID/POLY(VINYL ALCOHOL) FIBER MATS PRODUCED BY AN ELECTROSPINNING METHODJian Gong; Xiang-Dan Li; Bin Ding; Douk-Rae Lee; Hak-Yong Kim

The preparation of high percentage (20-80 percent) molybdosilicic acid/poly(vinyl alcohol) (PVA) fibre mats using the electrospinning technique is described. The fibre mats were characterised by IR XRD SEM and DSC and the results show that the PVA changes from a semicrystalline to an amorphous state with increasing molybdosilicic acid. The swelling properties of the fibre mats in water were investigated and the results are discussed. 25 refs.

Changchun Northeast Normal University; Chonbuk National UniversityCHINA; SOUTH KOREA

Accession no. 891935

Item 322ACS Polymeric Materials Science and Engineering, Spring Meeting 86, 2002, p.167EFFECTS OF PVA ON THE PROPERTIES OF CELLULOSE/OVA SOLUTION BLENDS IN NMMO HYDRATESeong Y-J; Kim B-C

The effect of PVAL on the properties of cellulose/PVAL blend solutions was investigated in methylmorpholine oxide hydrate. Characterisation was undertaken using DSC X-ray diffraction and rheological measurements. 15 refs.KOREA

Accession no. 891632

Item 323Proceedings of the TECH XXVI: LEARN TO SUCCEED held Washington, DC 2003, p.197POLYMERIZATION REACTION MONITORING FOR PSA PRODUCTION USING AN ATR-FTIR PROBEJovanovic R

ATR-FTIR spectrometry was applied to the off-line monitoring of solution polymerisations and copolymerisations of butyl acrylate and vinyl acetate and the data obtained used to establish real time in-situ monitoring of emulsion and mini-emulsion polymerisations. The performance of the analytical technique was compared

References and Abstracts

with traditional monitoring techniques namely gravimetry and PMR spectroscopy and limitations of the technique indicated. 7 refs.CANADA; USA

Accession no. 891642

Item 324Polymers for Advanced Technologies14, No.6, 2003, p.422PROPERTIES OF LOW-TEMPERATURE SWELLING HYDROGELS PREPARED WITH PARTIALLY SAPONIFIED PVA AND DRUG RELEASE USING THE HYDROGELSHoriike S; Yumoto K; Matsuzawa S; Yamaura K

The preparation of low-temperature swelling hydrogels using partially saponified polyvinyl alcohol (PVA) with glutaraldehyde as crosslinking agent for use as drug delivery systems were investigated. The block copolymer character of the partially saponified PVAs was estimated by carbon-13C-NMR. The hydrogels showed repeatable temperature-dependent swelling-shrinking behaviour. The dependence of drug absorption and release on the degree of polymerisation was studied using various drugs including para-acetamidophenol and insulin. 11 refs.

Shinshu UniversityJAPAN

Accession no. 891115

Item 325US 6569801 B2 20030527ADHESIVE MADE FROM CROSS-LINKING LIQUID CATALYST WITH AMINO RESINBerube S; Cutt J

The liquid catalyst has improved flexibility and adhesive properties which are imparted to the adhesive. The adhesive is composed of a crosslinkable polyvinyl acetate an acid and an ammonium salt.USA

Accession no. 890843

Item 326Iranian Journal of Polymer Science and Technology15, No.5, Dec.2002-Jan.2003, p.3011EXPERIMENTAL DESIGN FOR POLYMERISATION REACTION AND HYDROLYSIS OF POLYVINYL ACETATESemsarzadeh M A; Gangi H

Statistical empirical design is based on the statistical modelling of non-linear polynomial equation and coding of these equations in the solution polymerisation of vinyl acetate in a factorial design. The surface calculation considers time temperature and percent conversion as important factors in this polymerisation reaction. In response the influence of these factors is determined from the polynomial equations. Non-linear regression is also

used to model the hydrolysis of polyvinyl acetate. Variance analysis is used in the study of dispersion of experimental data. The confidence level in this design is reported from total sum of the square and statistical calculations.

Tarbiat Modarres UniversityIRAN

Accession no. 890222

Item 327Journal of Industrial Textiles32, No.3, 2003, p.223USE OF ATMOSPHERIC PRESSURE PLASMA TREATMENT IN DESIZING PVA ON VISCOSE FABRICSCai Z; Qiu Y; Hwang Y J; Zhang C; McCord M

Both air-oxygen-helium and air-helium atmospheric pressure plasma treatments are employed to desize PVA on a rayon (viscose) fabric. Both plasma treatments are able to remove some of the PVA on the rayon fabric and increase PVA solubility in cold water resulting in a higher weight loss in cold washing. The effect of the atmospheric pressure plasmas becomes greater as the treatment time increases. Plasma treatment followed by one cold and one hot washing has the same effect as conventional chemical treatments followed by two cycles of cold and hot washing. The atmospheric plasma treatment does not have negative effect on rayon fabric tensile strength. 13 refs.

Shanghai Donghua University; North Carolina State UniversityCHINA; USA

Accession no. 890213

Item 328Proceedings of the conference held San Francisco, CA, 163rd ACS Rubber Division Meeting, Spring 2003, Paper 19REINFORCEMENT AND NONLINEAR VISCOELASTICITY OF POLYMER MELTS CONTAINING MIXTURES OF NANOFILLERSSternstein S S; Ramorino G; Jiang B; Ai-Jun Zhu

The reinforcement of composites of poly(vinyl acetate) with binary filler pairs prepared by solution blending was studied experimentally by determining storage modulus loss modulus and loss factor and comparing the results with the predictions of a simple mixing rule model. It was found that an interaction term specific to each binary filler/matrix system was needed to predict storage moduli. Possible mechanisms by which the secondary filler affects reinforcement by the primary filler are discussed. 8 refs.USA

Accession no. 889974

Item 329Colloid and Polymer Science281, No.4, 2003, p.337

References and Abstracts

STUDY ON THE INITIAL STAGE OF EMULSION POLYMERIZATION OF VINYL ACETATE USING POLY(VINYL ALCOHOL) AS A PROTECTIVE COLLOIDSuzuki A; Yano M; Saiga T; Kikuchi K; Okaya T

A model experiment of emulsion polymerisation of vinyl acetate (VAc) is carried out using polyvinyl alcohol (PVA) as a protective colloid where a small amount of VAc (1 ml/100 ml water) is employed. This corresponds to the initial stage of the emulsion polymerisation. In the presence of the large amounts of PVA the number of new particles smaller than 80 nm continues to increase during the polymerisation while there is not much increase in the particle diameter. In contrast in the absence of PVA the particles formed at the very early stage continue to grow and the number of particles does not increase by so many. The fractionation of the polymers in the emulsion reveals that more than 90% of polymerised VAc and more than 70% of the PVA used are grafted. To realise these results the reaction times of three elemental reactions are calculated i.e. the initiation reaction of the sulphate radical with Vac the propagation of the PVAc radical and the hydrogen abstraction from the PVA with the sulphate radical. The time of the entry of the sulphate radical into a particle is 10-4 s. Hydrogen abstraction from PVA with the sulphate radical is the fastest reaction which results in the grafting onto PVA while the initiation reaction which results mainly in hom*opolymer is slower. The propagation of the PVAc radical in the aqueous phase is a much slower reaction. The grafted molecules coagulate with each other to become a particle. 12 refs.

Shiga Prefecture UniversityJAPAN

Accession no. 889407

Item 330Journal of Macromolecular Science AA40, No.3, 2003, p.211GRAFT COPOLYMERISATION OF METHYL ACRYLATE ONTO POLY(VINYL ALCOHOL) INITIATED BY POTASSIUM DIPERIODATOCUPRATE(III)Liu Y; Liu X; Deng K; Liu Z; Yang L

A novel redox system potassium diperiodatocuprate(III) (Cu(III))-polyvinyl alcohol (PVA) redox system is employed to initiate the graft copolymerisation of methyl acrylate (MA) onto PVA in alkaline medium. The grafting parameters vary with concentrations of monomer initiator macromolecular backbone (DP = 1750 M = 80000) and temperature. The formation of the graft copolymer is confirmed by Fourier transform infrared spectroscopy scanning electron microscopy X-ray diffraction and thermogravimetric analysis. It is found that (Cu(III))-PVA system is an efficient redox initiator for this graft copolymerisation. A mechanism is introduced to explain the formation of radicals and the initiation. At the same time

the other acrylate monomers such as methyl methacrylate ethyl acrylate and n-butyl acrylate are used as reductant to produce graft copolymerisation. It is definitely observed that these reactions can occur in some degree. Thermal stabilities are checked by TGA and this indicates that graft copolymer is resistant to moisture absorption. 24 refs.

Hebei UniversityCHINA

Accession no. 889260

Item 331Polymer Preprints2002, 43, No.2, p.289INFLUENCE OF NITROXYL RADICAL STRUCTURE ON CONTROLLED RADICAL hom*o- AND COPOLYMERIZATION OF DIFFERENT VINYL MONOMERS: EXPERIMENTAL AND QUANTITATIVE INVESTIGATIONSGrishin D F; Kolyakina E V; Pavlovskaya M V; Semionycheva L L; Razuvaev A G

2-Methyl-2-nitrosopropane phenyl-N-tert-butylnitrone and 1-tert-butyl-3-phenyl-1-oxytriazene were evaluated as alternatives to the use of 2266-tetramethylpiperidinyl-1-oxy/benzoyl peroxide for the controlled radical polymerisation of vinyl monomers (methyl methacrylate butyl methacrylate butyl acrylate styrene vinyl chloride and vinyl acetate) at temperatures in the range 50-70 C. From considerations of the polymerisation kinetics and molecular weight of the resulting polymers it was concluded that sterically hindered higher molecular weight nitroxyl macroradicals produced in the course of polymerisation were more effective in controlling chain growth over the temperature range 50-70 C than their low molecular weight analogues. This observation was supported by quantum chemical calculations. 10 refs.RUSSIA

Accession no. 889150

Item 332Journal of Polymer Science: Polymer Chemistry Edition41, No.8, 2003, p.1107NOVEL APPROACH TO THE CHEMICAL MODIFICATION OF POLY(VINYL ALCOHOL): PHOSPHORYLATIONLiu Y-L; Chiu Y-C

The chemical modification of polyvinyl alcohol (PVA) is performed through oxidation followed by nucleophilic addition. PVA is oxidised by KMnO4 to form vinyl ketone units along the polymer backbone. The chemical modification of PVA is then conducted through the reaction of the carbonyl group of the vinyl ketone unit with 910-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) as a nucleophile. Through this approach the phosphorous DOPO group is attached onto the carbon atom

References and Abstracts

of the polymer main chain rather than onto the pendent hydroxyl groups of PVA. The formed DOPO-containing PVA shows improved thermal stability organosolubility and flame retardance. 29 refs.

Chung Yuan Christian UniversityCHINA

Accession no. 87877

Item 333Reactive and Functional Polymers55, No.1, 2003, p.61SYNTHESIS AND CHARACTERISTICS OF INTERPENETRATING POLYMER NETWORK HYDROGELS COMPOSED OF POLY(VINYL ALCOHOL) AND POLY(N-ISOPROPYLACRYLAMIDE)Seon Jeong Kim; Sang Jun Park; Sun I Kim

The characteristics of this interpenetrating polymer network (IPN) were investigated using FT-IR and differential scanning calorimetry. A hydrogel IPN combining polyvinyl alcohol and poly(n-isopropylacrylamide) was chosen for testing because of interesting response to temperature swelling in water below the lower critical solution temperature (LCST) and shrinking above the LCST which could offer applications in biomedical areas. Two sister papers published alongside this paper investigated other IPN systems. The hydrogel IPNs used in this case were synthesised using three different ratios of polymers. Polymerisation was carried out using the sequential IPN method. Firstly the PVA was polymerised in the presence of the other monomer using glutaraldehyde as a crosslinker and catalyst then the second monomer was polymerised. Swelling in water was investigated at varying pH and temperature and the proportion of free and bound water was determined. The hydrogel with the lowest proportion of PVA (50%) gave the highest swelling ratio. 29 refs.

Hanyang UniversitySOUTH KOREA

Accession no. 887742

Item 334Journal of Applied Polymer Science88, No.13, 2003, p.3026NETWORK CHARACTERIZATION AND SWELLING BEHAVIOUR OF CHEMICAL HYDROGELS BASED ON ACID-CONTAINING POLY(VINYL ALCOHOL)Ruiz J; Mantecon A; Cadiz V

Poly(vinyl alcohol) (PVA) was modified with phthalic and succinic anhydride to yield vinyl alcohol-vinyl ester copolymers that contain carboxylate groups. Crosslinking of these half-esters was then achieved by using poly(ethylene glycol) (PEG) 400 diglycidylether. To obtain low degrees of crosslinking low crosslinker/carboxylate ratios were used The capacity of the resulting

hydrogel to absorb water was therefore high. Water absorption was determined gravimetrically as a function of time at room temperature. Characterisation of the equilibrium swelling ratio and compressive modulus was carried out for all the resulting PVA hydrogels and these were related to the network structure. 20 refs.

Tarragona Universitat Rovira I VirgiliEUROPEAN COMMUNITY; EUROPEAN UNION; SPAIN; WESTERN EUROPE

Accession no. 887734

Item 335Polymer Preprints2002, 43, No.2, p.1085SYNTHESIS OF HYDROXY TERMINATED POLY(VINYL ACETATE) BY CHAIN TRANSFER TO SOLVENT

Collins S; Rimmer S

Vinyl acetate was polymerised in two alcoholic solvents capable of acting as chain transfer agents isopropanol and 2-isopropoxyethanol producing poly(vinyl acetate) with hydroxy terminal groups. AIBN was used as the initiator. The polymers were characterised by size exclusion chromatography and vapour pressure osmometry. The chain transfer coefficient was derived by comparing the degree of polymerisation with the solvent and monomer concentrations according to the differentiated form of the Mayo equation. The results followed the Mayo equation when 2-isopropoxyethanol was used as a solvent but some deviation was seen in the case of isopropanol. It was suggested that this deviation was the result of multiple transfers to solvent. 2 refs.EUROPEAN COMMUNITY; EUROPEAN UNION; UK; WESTERN EUROPE

Accession no. 886541

Item 336Polymer Preprints2001, 42, No.2, p.653VAPOR DETECTION USING ARRAYS OF CONDUCTING POLYMER COMPOSITE CHEMIRESISTORSLewis N S; Briglin S; Freund M S; Hopkins A

Vapour detection was performed using arrays of conducting polymer composite chemiresistors. The polymers used as sensors included poly(4-vinyl phenol) poly(styrene-co-allyl alcohol) poly(methyl styrene) poly(vinyl chloride-co-vinyl acetate) poly(vinyl acetate) poly(N-vinylpyrrolidone) poly(ethylene oxide) poly(carbonate bisphenol A) poly(styrene) and poly(caprolactone). It was found that detector arrays fabricated from conducting polymer composites provide a convenient low power flexible implementation for vapour detection. Improved diversity in the detector array can be obtained through a broad selection of polymers polymer blends and plasticisers. These arrays offer an opportunity for developing pattern-recognition

References and Abstracts

based approaches to vapour detection using combinatorial chemistry techniques in polymer fabrication and sensor preparation. 12 refs.

Accession no. 885754

Item 337Polymer Testing22, No.4, 2003, p.381CHARACTERISATION OF BETA-CHITIN/ POLY(VINYL ALCOHOL) BLEND FILMSPeesan M; Rujiravanit R; Supaphol P

Blend films of beta-chitin (poly(N-acetyl-D-glucosamine)) and poly(vinyl alcohol) (PVAL) of differing compositions were prepared by solution-casting from solutions of beta-chitin and PVA in concentrated formic acid. It was observed that films prepared from pure beta-chitin and pure PVA were transparent but the film having 50/50 composition was cloudy. The effect of blend composition on physical thermal and mechanical properties morphology and swelling behaviour was investigated and the results compared to those for the pure components. For example DSC measurements showed that glass transition temperatures of the blend films increased with increasing beta-chitin content while melting temperatures tended to decrease. 17 refs.

Chulalongkorn UniversityTHAILAND

Accession no. 885416

Item 338Polymers for Advanced Technologies14, No.2, 2003, p.79INFLUENCE OF A ZWITTERIONIC SURFACTANT ON THE CHROMOGENIC BEHAVIOR OF A DYE-CONTAINING AQUEOUS PVA-POLYETHER GEL NETWORKKriwanek J; Lotzsch D; Vetter R; Seeboth A

The effect of the addition of a zwitterionic sulphobetaine to a dye-containing polymer gel composed of two polymers - polyvinyl alcohol (PVA) and polyether - is investigated. With increasing sulphobetaine content a remarkable reduction of the UV-vis-absorption intensity of the longest wavelength absorption band of Phenol Red in the aqueous polymer network is observed even for sulphobetaine concentrations below its critical micelle concentration (cmc). It can be assumed that this effect is based on the formation of ionic complexes dye molecules and either single sulphobetaine molecules or aggregates of sulphobetaine. Furthermore thermotropic behaviour occurs in the investigated polymer gel even at a polyether concentration as low as 0.8 wt.%. 10 refs.

Fraunhofer Institute For Applied Polymer ResearchEUROPEAN COMMUNITY; EUROPEAN UNION; GERMANY; WESTERN EUROPE

Accession no. 884388

Item 339Journal of Applied Polymer Science88, No.1, 2003, p.104ELECTRON SPIN RESONANCE AND ULTRAVIOLET SPECTRAL ANALYSIS OF UV-IRRADIATED PVA FILMS FILLED WITH MNCL2 AND CRF3Zidan H M

PVAl films containing various contents of chromium fluoride and manganese chloride were prepared and the structural modification that occurred due to filling with different levels and/or UV irradiation was studied using ESR and UV-visible spectroscopies. The ESR analysis revealed that the spin configuration of chromium fluoride- manganese chloride- and cobalt bromide-filled PVAl differed. The filling level dependence of the ESR parameters was investigated. The UV-visible spectral analysis for pure PVAl showed absorption bands at 265 and 280 nm which were assigned to the presence of carbonyl groups. The addition of chromium fluoride led to the appearance of other bands at 418 and 596 nm. The addition of manganese chloride led to a new band at about 350 nm due to charge transfer transition. The results indicated that the Cr3+ or Mn2+ were present in the octahedral symmetrical form within the PVAl matrix. SEM micrographs of chromium fluoride-filled PVAl were examined. 23 refs.

Mansoura UniversityEGYPT

Accession no. 883213

Item 340Polymers for Advanced Technologies13, No.10-12, 2002, p.938BIODEGRADABLE COMB POLYESTERS CONTAINING POLYELECTROLYTE BACKBONES FACILITATE THE PREPARATION OF NANOPARTICLES WITH DEFINED SURFACE STRUCTURE AND BIOADHESIVE PROPERTIESBreitenbach A; Jubg T; Kamm W; Kissel

A major challenge in oral peptide and protein delivery remains the search for suitable carrier systems. Therefore a new concept is investigated combining a modified 3D architecture increased hydrophilicity of polylactic co-glycolic acid (PLGA) and charged groups in a single polymer. Biodegradable comb PLGA synthesised by grafting short PLgA chains onto different polyvinyl alcohol-based backbone polyols poly(2-sulphobutyl-vinyl alcohol) and polydiethylaminoethyl-vinyl alcohol. The polyelectrolyte backbones are obtained by etherification of PVA with charge-containing pendent groups. The comb polymer structure can be confirmed by NMR IR spectroscopy differential scanning calorimetry elemental analysis and measurement of intrinsic viscosity. Nanoparticles (NP) as potential mucosal carriers systems are prepared by controlled precipitation and investigated

References and Abstracts

as a function of polymer composition. The amphiphilic character and the 3D architecture of the novel polyesters allow the preparation of small nanoparticles even without the use of surfactants. Surface NMR surface charge and hydrophobicity determination indicate a core-corona-like NP structure especially in the case of charged polyesters. A structural model is proposed for the NP with an inner polyester core and an outer charged-groups-containing surface depending on polymer composition and backbone charge density. The higher the polymer backbone charge density the more pronounced its influence on the nanoparticle surface properties. The possibility of preparing NP without the use of a surfactant as well as of designing the NP surface characteristics by polymer backbone charge density and polymer hydrophilic-hydrophobic balance will be a major or advantage in protein adsorption bioadhesion and organ distribution. This makes these biodegradable polymers promising candidates for colloidal protein and peptide delivery. 31 refs.

Marburg Philipps UniversitatEUROPEAN COMMUNITY; EUROPEAN UNION; GERMANY; WESTERN EUROPE

Accession no. 882548

Item 341Journal of Polymers and the Environment10, No.1-2, 2002, p.31PROCESSING AND PHYSICAL PROPERTIES OF PLASTICS MADE FROM SOY PROTEIN POLYESTER BLENDSMungara P; Chang T; Zhu J; Jane J

Blends of soy protein and biodegradable polyesters (Biomax and polycaprolactone) were prepared. The blends were prepared in either a one-step or a two-step compounding extrusion process. The compatibiliser used in this study was polyvinylpyrrolidone (PVP). Poly(vinyl alcohol) (PVA) or polycaprolactone (PCL) were used to plasticise the Biomax; glycerol was used as a plasticiser for the soy formulations. The blend pellets formed were then used to produce injection-moulded tensile bars. The mechanical properties (ASTM D638-86) water absorption (ASTM D 570) thermal properties (DMA) and structure (SEM) were analysed. The blends demonstrated high tensile strength (16 - 22 MPa for PVA blends; 27 - 33 MPa for PCL blends). PVA blends having the highest percentages of the synthetic polymer had the greater strengths. All the blends had high Young's moduli but had brittle characteristics (elongation at break 1.8 - 3.1 percent). The blends showed low water absorption and good stability under ambient conditions compared to plastics made from soy protein alone. The lowest water absorption was observed for blends made from soy protein flour. SEM micrographs for all the blends showed that the synthetic polymers were dispersed hom*ogeneously throughout the protein matrix in each case. 15 refs.

Iowa State UniversityUSA

Accession no. 880925

Item 342Materiale Plastice39, No.4, 2002, p.202STUDY OF THE OPTICAL PROPERTIES OF SOME COMPOSITE BASED ON GELLAN AND ELECTROACTIVE SYNTHETIC POLYMERSStrat M; Strat G; Gutlui S; Alupei C

The results of an investigation on the preparation characterisation and determination of optical properties of gellan-polyvinyl alcohol (PVA) gellan-poly(N-vinyl pyrrolidone) (PVP) and gellan-poly(N-vinyl imidazole) (PVI) composites are described; it represents part of a major work dedicated to the development of a new source of dielectric biomaterials for medical devices. The choice of PVA PVP and PVI is based on the fact that these materials polymers are good electroactive synthetic polymers. 3 refs.

Jassy, Cuza Al.I.University; Asachi G.Technical UniversityEASTERN EUROPE; RUMANIA

Accession no. 880370

Item 343ACS Polymeric Materials: Science and Engineering, Spring Meeting84, 2001, p.798CONTROLLING THE MORPHOLOGY OF CALCIUM CARBONATE CRYSTALS USING MULTIFUNCTIONAL MACROMOLECULAR ADDITIVESValiyaveettil S; Lakshminarayanan R

Biological organisms have evolved strategies to control the structure and morphology of the minerals using a wide variety of proteins. They use the inorganic minerals for different purposes. A number of synthetic templates such as molecular ribbons surfactants Langmuir monolayers self-assembled monolayers natural and synthetic polymers in the form of fibres and films and hydrophilic block copolymers have been used in recent years to mimic biomineralisation which has many technological advantages. The use of polyvinyl alcohol and sodium silicate as template for the nucleation and morphology control of calcium carbonate crystals is reported. The use of multi functional polyvinyl alcohol (PVA) and sodium silicate (NaSi) as template for the studies is motivated by their existing industrial applications. The aim is to establish the influence of these water-soluble additives in nucleating a specific polymorph and directing the formation of a specific morphology of the calcium carbonate crystals. Neutral organic polymeric additives and anionic inorganic additives exhibiting complex solution properties behave differently in the nucleation of

References and Abstracts

various polymorphs of calcium carbonate crystals. While PVA additives favoured the nucleation of aragonite phase the silicate additive induces an oriented nucleation of the calcite crystals. In both cases it is believed that the self-assembly of additives plays a major role in controlling the nucleation and morphology of calcium carbonate polymorphs. The role of molecular conformation of these additives is currently being established in nucleation of various polymorphs as well as in deciding the morphology of the crystals. 14 refs.SINGAPORE

Accession no. 880228

Item 344ACS Polymeric Materials: Science and Engineering, Spring Meeting, Proceedings of a conference held San Diego, CA84, 2001, p.1057DIALDEHYDES AS CROSSLINKING AGENTS FOR IMPROVED PAPER WET STRENGTHXu G G; Yang C Q

Improvements in the wet strength and dry strength including tensile strength and folding endurance of paper treated with a combination of dialdehydes (glutaraldehyde or glyoxal) with polyvinyl alcohol (PVA) were investigated. Effects of cure time and temperature on the crosslinking reaction with the cellulose were also examined. It was shown that a combination of PVA with glutaraldehyde proved the more efficient at improving the wet and dry performance of the paper. 9 refs.USA

Accession no. 879390

Item 345Proceedings of the 60th SPE Annual Technical Conference (ANTEC 2002) held San Francisco, CA Paper 505 Session T51-Flexible Plastics Packaging, Barrier Packaging Materials and ApplicationsEFFECT OF HIGH BARRIER EMULSION POLYMERS ON THE REDUCTION IN WATER VAPOUR TRANSMISSION RATES OF LAMINATED CARTONLendrum S; Ryan N M; McNally G M

Two ply laminated carton boards were prepared by bonding 300 or 350 g/m2 board using a variety of polymers which acted as both adhesive and water vapour barrier. The polymers were: commercially available emulsion grades of ethylene-vinyl alcohol (EVOH) copolymer poly(vinylidene chloride) tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer; and poly(vinyl alcohol) commercial adhesives. The water vapour permeabilities of the prepared boards were measured at 60% RH and 20 C. The permeability decreased with increasing polymer layer thickness and it was possible to achieve the market requirements for a permeability of 20-50 g/m2/24 h. EVOH gave the lowest permeability. 6 refs.

EUROPEAN COMMUNITY; EUROPEAN UNION; UK; WESTERN EUROPE

Accession no. 879110

Item 346High Performance Polymers14, No.3, 2002, p.261PROPERTIES OF THE INTERPENETRATION POLYMER NETWORK HYDROGELS COMPOSED OF POLY(VINYL ALCOHOL) AND POLY(DIALLYLDIMETHYLAMMONIUM CHLORIDE)Kim S J; Yoon S G; Kim S L

Temperature- and pH-responsive interpenetrating polymer network (IPN) hydrogels constructed with polyvinyl alcohol (PVA) and polydiallyldimethylammonium chloride (PDADMAC) using the sequential IPN method are studied. The characterisations of IPN hydrogels are investigated using Fourier transform infrared spectroscopy and differential scanning calorimetry. IPN hydrogels exhibit a relatively high swelling ratio 180-360% at room temperature. The swelling ratio for the hydrogels depend on pH and temperature. DSC is used to determine the amount of free water in IPN hydrogels. The amount of free water increases with increasing PDADMAC content in the IPN hydrogel. 19 refs.

Hanyang UniversityKOREA

Accession no. 877789

Item 347Journal of Applied Polymer Science87, No.8, 2003, p.1239PREPARATION OF MAGNETIC POLYVINYL ALCOHOL MATERIALS BY IN SITU SYNTHESIS OF MAGNETITE IN A PVA MATRIXLin H; Watanabe Y; Kimura M; Hanabusa K; Shirai H

Nanosized magnetite particles were synthesized in situ within PVAL solutions by precipitating ferrous ions or a mixture of ferrous and ferric ions with sodium hydroxide solution. Transparent films were obtained by a casting method and six kinds of magnetic PVAL fibres were also prepared by a wet-spinning method. Mechanical properties were measured. 29 refs.

Shinshu UniversityJAPAN

Accession no. 876923

Item 348Adhesion '02, Proceedings of EURADH 2002 held in Glasgow2002, p.49FRACTURE ANALYSIS AND TESTING OF WOOD-ADHESIVE BONDS FOR TIMBER ENGINEERING APPLICATIONSSerrano E; Gustafsson P J

References and Abstracts

The results are reported of an investigation of the fracture of wood finger-joint specimens reinforced with either threaded steel rods or smooth glass fibre-reinforced polyester rods and bonded with various adhesives. Adhesives employed were phenol-resorcinol-formaldehyde two-component PU or polyvinyl acetate. The strength fracture energy and shapes of the stress-slip relations for the specimens were determined and a constitutive model which includes a total of 4 independent material parameters (shear strength and fracture energy in shearing (Mode II) and normal strength and fracture energy in opening mode (Mode I)) developed to predict the behaviour of the wood-adhesive joints. 5 refs.EUROPEAN COMMUNITY; EUROPEAN UNION; SCANDINAVIA; SWEDEN; UK; WESTERN EUROPE

Accession no. 876553

Item 349Journal of Membrane Science209, No.1, 2002, p.271FLAKE-FILLED REACTIVE MEMBRANESLape N K; Yang C; Cussler E L

Aligned mica flakes and colloidal zinc oxide can combine to reduce the acid permeability and increase the lag time in polyvinyl alcohol (PVA) membranes. The permeability is reduced up to ten times by the flakes but is affected much less by the zinc oxide. The lag times are increased by up to 1000 times by a combination of flakes and reaction. The results can be estimated with theories for this transport including variations with the square of the volume fraction of flakes and the first power of zinc oxide concentration. These estimates are successful only when the flakes are evenly distributed within the membrane. When they are unevenly distributed the apparent membrane permeability behaves differently. While the experiments use only PVA as a polymer the same flakes and reactants will give the same relative permeability reductions with other less permeable polymers. 40 refs.

Minnesota UniversityUSA

Accession no. 873793

Item 350Polymer Plastics Technology and Engineering41, No.5, 2002, p.863SYNTHESIS RHEOLOGICAL BEHAVIOUR AND MECHANICAL PROPERTIES OF GRAFT-TYPE ACS RESINGao J; Sun S; Li D; Yang L

Using suspension polymerisation synthesis of graft-type ACS resin (acrylonitrile-chlorinated polyethylene-styrene terpolymer) and alpha-methyl styrene-containing ACS was carried out with particular attention paid to the effect of concentration of initiator and polyvinyl alcohol (PVA) on the reaction. With increasing concentration of initiator in the first stage the graft efficiency increased but it began

to fall when the initiator concentration exceeded 3.3-3.5 x 10-4 mol/L. With increasing concentration of PVA the graft efficiency gradually decreased. Studies were carried out on the rheological behaviour mechanical properties and morphological properties of resins. The rheological behaviour deteriorated with increasing content of chlorinated polyethylene and the melt was a pseudo-plastic liquid. As the content of chlorinated polyethylene increased the impact strength of graft-type ACS resin increased. The rheological properties and impact characteristics of alpha-methyl styrene-containing ACS resin improved because of the introduction of alpha-methyl styrene and overall properties were optimised at the 5% alpha-methyl styrene content of ACS resin. 18 refs.

Hebei UniversityCHINA

Accession no. 873381

Item 351ISO/DIS 15023-2. PLASTICS - POLY(VINYL ALCOHOL) (PVAL) MATERIALS - PART 2: DETERMINATION OF PROPERTIES Version 50.00 (2002).SWITZERLAND; WESTERN EUROPE

Accession no. 873105

Item 352Journal of Applied Polymer Science86, No.11, 2002, p.2854PROPERTIES OF MODIFIED POLY(VINYL ALCOHOL) MEMBRANES PREPARED BY THE GRAFTING OF NEW POLYELECTROLYTE COPOLYMERS FOR WATER-ETHANOL MIXTURE SEPARATIONWen-Yen Chiang; Yi-Haw Lin

Graft copolymers were synthesised by the reaction of PVAL with poly(sodium salt styrene sulphonic acid-co-maleic acid) (PSStSA-co-MA). Membranes of PVAL-g-PSStSA-co-MA formed a crosslinking network after heat treatment. Crosslinking enhanced the water insolubility and mechanical strength whilst retaining a high affinity towards water. The difference in the hydrogen bonding interactions between the membrane and water and the membrane and alcohol (methanol ethanol or isopropanol) showed that the membrane showed selective permeability towards water in a water-alcohol solution. The permeation flux decreased and the separation factor increased as the PSStSA-co-MA (crosslinking agent) content increased. 17 refs.

Tatung UniversityTAIWAN

Accession no. 872968

Item 353Journal of Sol-Gel Science and Technology25, No.2, 2002, p.103

References and Abstracts

PREPARATION AND CHARACTERISATION OF POROUS FILMS BY A MODIFIED BASE-CATALYSED SOL-GEL PROCESS CONTAINING PVA; II. FILM PREPARATIONLiu Y; Chen H; Zhang L; Yao X

Porous SiO2 films are successfully deposited on silicon substrates by a modified base-catalysed sol-gel process (MBCP) containing polyvinyl alcohol (PVA). The process conditions such as gelation time synthesis temperature stabilising agent of the precursor solution and spin coating speed heat-treatment annealing temperature of the film on the microstructure and porosity of porous SiO2 films are systematically investigated by SEM XRD and ellipsometry techniques. A novel preparation technique for porous SiO2 film is presented. Using this process the resultant film can reach a thickness of 3.6 μm for one layer a porosity of 25-50% a low thermal conductivity of 0.11 W/m.K. This film will be used as a low dielectric layer and thermal-insulating layer and a low refractive index layer. 11 refs.

Canberra Australian National University; Xian Jiaotong University; Tongji UniversityAUSTRALIA; CHINA

Accession no. 871889

Item 354Journal of Sol-Gel Science and Technology25, No.2, 2002, p.95PREPARATION AND CHARACTERISATION OF POROUS SILICA FILMS BY A MODIFIED BASE-CATALYSED SOL-GEL PROCESS CONTAINING PVA. I. PRECURSOR SOLUTION SYNTHESISLiu Y; Chen H; Zhang L; Yao X

A novel modified base-catalysed sol-gel process containing polyvinyl alcohol (PVA) is proposed to prepare the porous SiO2 film. In this process the growth of the sol particles is artificially broken off and controlled by acid-stabilising agent and PVA. As a result a uniform and stable precursor solution is obtained in which the size of sol particles is stable. This new process efficiently overcomes the shortcomings of the traditional base-catalysed sol-gel process and can be employed to prepare porous SiO2 films with desired porosity and thickness. The influence of catalyst reaction temperature pH value stabilising agent and PVA additive on the size of the SiO2 sol particles is systematically studied. 22 refs.

Canberra Australian National University; Xian Jiaotong University; Tongji UniversityAUSTRALIA; CHINA

Accession no. 871888

Item 355Synthetic Metals130, No.2, 2002, p.121LUMINESCENCE INTENSITY ENHANCEMENT INDUCED BY LASER IRRADIATION IN

POLY(VINYL ALCOHOL) AND POLY (3-THIOPHENEACETIC ACID)BLENDDe Souza J M; Dos Anjos P N M; Pereira E C

Photoluminescence (PL) of polymeric blends with polyvinyl alcohol (PVA) and poly(3-thiopheneacetic acid) (PTAA) is investigated. An increase in the PL intensity induced by laser irradiation is found. The PL quantum efficiency is dependent on irradiation time laser intensity and PTAA doping state (acid or salt). PL intensity increases up to 200% for acid PTAA and 50% for salt PTAA. The PL efficiency relative enhancement is 314% for acid PTAA and 140% for salt PTAA. Using IR spectroscopy this effect is related to hydrogen bond interaction between PTAA and PVA excited states induced by laser irradiation that reduce the non-radiative decay rate. 25 refs.

Sao Carlos Universidade FederalBRAZIL

Accession no. 870543

Item 356US 6440259 B1 20020827ONE-PART STORAGE-STABLE WATER-BASED CONTACT ADHESIVE COMPOSITION WITH AN INTERNAL COAGULANTPatel V

The contact adhesives comprises an adhesive component comprising polychloroprene rubber and an internal coagulant. They may also contain a resinous component selected from the group consisting of ethylene-vinyl acetate copolymer polyvinyl acetate hom*opolymer polyvinyl acetate copolymer acrylic copolymer polyvinyl acetate acrylic copolymer and combinations thereof. The internal coagulant may be hygroscopic salt amino acid or a combination thereof.USA

Accession no. 870289

Item 357Kobunshi Ronbunshu59, No.9, 2002, p.511PREPARATION OF COMPOSITE FILM USING WASTE PULPHadano S; Onimura K; Yamasaki H; Tsutsumi O

Treated waste pulp (pulp) is used as a cellulosic material. Water-soluble cellulose (PSAAc) is synthesised by acetylation of cellulose succinate. Composite films are prepared from PSAAc and polyvinyl alcohol (PVA) by a casting method and crosslinked by heating or reacting with hexamethylene diisocyanate (HDI). These films are hom*ogeneous and transparent. Three types of hom*ogeneous films - non-treated film HDI-treated film and heat-treated film and heterogeneous film obtained from pulp and PVA are used for tensile strength and biodegradation tests. HDI-treated film shows the highest elongation (592%). On the other hand the heat-treated film

References and Abstracts

and the heterogeneous film are fragile. The biodegradation test in soil gives the following order of weight loss for composite films: heterogeneous film greater than non-treated film greater than HDI-treated film greater than heat-treated film. 8 refs.

Yamaguchi University; Ube National College of TechnologyJAPAN

Accession no. 869594

Item 358Journal of Applied Polymer Science86, No.3, 2002, p.622PREPARATION PHYSICO-CHEMICAL CHARACTERIZATION AND OPTICAL ANALYSIS OF POLYVINYL ALCOHOL-BASED FILMS SUITABLE FOR PROTECTED CULTIVATIONDe Prisco N; Immirzi B; Malinconico M; Mormile P; Petti L; Gatta G

A subject of considerable interest from the environmental perspective is the use of biodegradable films for mulching. This is also of interest in terms of the intrinsic properties that such films might have when appropriately designed. Starting with existing biodegradable polymers a synthetic approach has been developed that leads to a new material characterised by a time-controlled biodegradation. The concept was to bridge polyvinyl alcohol (PVOH) chains through polycaprolactone (PC) crosslinks. In this manner PVOH loses its water sensitivity and can stand on the ground for the time required for mulching to occur while the PCL crosslinks being sensitive to a slow fungal attack will undergo cleavage followed by the complete bio-assimilation of the residual PVOH chains. Time of biodegradation can be controlled by the number of crosslinks introduced. The polymers were characterised for their intrinsic chemical-physical properties while a preliminary evaluation of their efficiency as mulches was achieved through the analysis of their thermal behaviour when deposited on an irrigated soil. The results were compared with a model approach capable of predicting the thermal behaviour of a film in particular environments. 13 refs.

Instituto Di Ricerca e Tecnologia Delle Materie Plastiche; Basilicata University; Italy National Research CouncilEUROPEAN COMMUNITY; EUROPEAN UNION; ITALY; WESTERN EUROPE

Accession no. 868951

Item 359Macromolecular Chemistry and Physics203, No.10-11, 2002, p.1526BIODEGRADATION OF POLY(VINYL ALCOHOL) IN SOIL ENVIRONMENT: INFLUENCE OF NATURAL ORGANIC FILLERS AND STRUCTURAL PARAMETERS

Corti A; Cinelli P; D'Antone S; Kenawy E-R; Solaro R

Biodegradation of polyvinyl alcohol (PVA) films in blends with natural polymers such as gelatin and lignocellulose by-products and with polyvinyl acetate was studied under simulated soil burial conditions by determination of evolved carbon dioxide. The influence of residual acetyl groups in the PVA was also examined and appeared to have a positive influence on biodegradation. The effect of each blend component on the biodegradation was considered and it was determined that biodegradation of PVA and PVA blends under soil burial conditions is quite limited. The PVA appears to depress biodegradability of the other components of the blend compared to that of the pure component although an increase in hydrophobic character of the blend component appears beneficial. 27 refs.

Pisa UniversityEUROPEAN COMMUNITY; EUROPEAN UNION; ITALY; WESTERN EUROPE

Accession no. 868920

Item 360Polymer Preprints2000, 41, No.1, p.66INVESTIGATION OF LATEX COPOLYMERS AND TERPOLYMERS CONTAINING NEO VINYL ESTERS FOR ARCHITECTURAL COATING APPLICATIONSYang H W; Swarup V; Ellis P S; Subramanian R; Smith O W; Thames S F

The performance of branched neo vinyl esters (formed from neo acids - for example trialkyl substituted acetic acid) in improving the resistance to hydrolysis of vinyl acetate and vinyl acrylic based latices was examined using several different monomer feed compositions. The long alkyl groups on the neo esters provide umbrella protection of the ester group and improve the hydrophobic behaviour of the coating. Samples were characterised for particle size minimum filming temperature and water absorption and were compared to typical commercial coating formulations for scrub resistance and external weathering performance. 4 refs.USA

Accession no. 868884

Item 361Journal of Polymer Science: Polymer Physics Edition40, No.17, 2002, p.1949THERMAL LENSING IN POLY(VINYL ALCOHOL)/POLYANILINE BLENDSPilla V; Catunda T; Balogh D T; Faria R M; Zilio S C

Non-linear optical properties of polyvinyl alcohol (PVA)/polyaniline (PAni) blends are measured with the single-beam Z-scan technique with Fourier analysis. The results obtained with continuous wave (cw) excitation indicate that the self-phase modulation has a thermal origin. Besides the Z-scan technique the time-resolved

References and Abstracts

mode-mismatched thermal lens (TL) technique employed to obtain the temperature coefficient of the optical path length ds/dT and the thermal diffusivity coefficient D for the specific concentrations used in our blends. ds/dT varies between -0.8 and -1.0 x 10-4/K-1 whereas the thermal diffusivity varied between 1.0 and 1.3 x 10-3cm2. The TL technique is further used to study the ageing of the blends as they are heated to 90 deg.C. Unlike the electrical conductivity of PAni films which presents a strong dependence on the doping level the thermooptic properties present only a slight variation with doping. This feature indicates that the PVA/glutaraldehyde network made the main contribution to the thermooptic properties (D and ds/dT) in the PAni blends. Similarly dimethyl sulphoxide as a solvent determined the thermooptic properties of PAni solutions. 24 refs.

Sao PauloUniversityBRAZIL

Accession no. 866638

Item 362Polymer International51, No.8, 2002, p.715GELATION OF A NEW HYDROGEL SYSTEM OF ATACTIC-POLY(VINYL ALCOHOL)/NACL/H2ODai L; Ukai K; Shaheen S M; Yamaura K

a-P/VA/NaCl/H2O hydrogels are prepared by gelation of aqueous atactic-polyvinyl alcohol (a-PVA) solutions in the presence of NaCl. The gelling temperature melt temperature and the preservation of water of the hydrogels are measured. The effect of the addition of NaCl to the hydrogels on gelling temperature and melting temperature is marked when the NaCl concentration is over a certain value. High NaCl concentration favours high-melting-point hydrogels. When the NaCl concentration is high enough (such as 11%) high-melting-point and white turbid opaque a-PVA/NaCl/H2O hydrogels can be prepared regardless of the PVA concentration. Similarly the low gelling temperature of a-PVA/NaCl/H2O solutions comes from low NaCl concentration while high gelling temperature ranges from 50 to 70 deg.C when the NaCl concentration is 11%. In appearance the types of syneresis of a-PVA/NaCl/H2O are X-type or a mixture of X- and n-types; water release of the hydrogels is slowed down by the addition of NaCl. 16 refs.

Soochow University; Shinshu UniversityCHINA; JAPAN

Accession no. 863757

Item 363Polymer International51, No.8, 2002, p.687MOLECULAR SELECTIVITY OF TYROSINE-IMPRINTED POLYMERS PREPARED BY SEED SWELLING AND SUSPENSION POLYMERISATION

Zhang L; Cheng G; Fu C

Tyrosine-imprinted microspheres are prepared in an aqueous system by seed swelling and suspension polymerisation using trimethylolpropane trimethacrylate (TRIM) acrylamide (AM) as well as methacrylic acid (MAA) linear polystyrene and toluene as crosslinker functional monomers seeds and porogens respectively. The size distribution proves to be greatly influenced by the ratio of water:TRIM (W/T) and the concentration of dispersant. When W/T is 46:1 (v/v) 4.6% (by mass) of poly(vinyl alcohol) (PVA) was used as dispersant the molar ratios of tyrosine MAA AM and TRIM are 1:8:8:17 the polymer beads have the better size monodispersity and the average size is 135 mu m while the sizes of the pores on the beads surfaces ranged from 1.25 to 9.0 μm. The adsorption behaviour and molecular selectivity of the beads are analysed using liquid chromatography; the results show that the adsorption behaviour of the beads follow the rule of Langmuir and the value of saturated absorption is 0.197 mmol g/1. The tyrosine-imprinted polymers exhibit an inherent selectivity for tyrosine; when phenylalanine is used as the competing molecule the separation factor alpha is up to 1.91. However the control polymers do not have this special molecule-selection capability and the relative separation factor beta is about 1.82 compared with the imprinted polymers. 21 refs.

Tianjin UniversityCHINA

Accession no. 863754

Item 364Proceedings of Tech XXV, 25 Years of Tape Innovations.held Atlanta, GA 2002, p.83FATE OF RESIDUAL SOLVENT IN DRYING COATINGS: CAN IT GET TRAPPED AND HOW?Cairncross R A

A common goal in industrial drying of polymer solution coatings is to reduce the residual solvent content (RSC) to a specified level. Industrial dryers consist of a series of zones operated at different air temperatures and airflow rates to meet the RSC specifications and to produce defect-free coatings. A common observation is that when drying at a constant temperature the residual solvent content plateaus and the drying rate effectively drops to zero. Often the RSC can be reduced by further increasing the temperature. In hom*ogeneous polymer solutions above the glass transition temperature of the polymer the observed plateau in RSC is accurately predicted by Fickian diffusion with a concentration-dependent diffusion coefficient. A simple model is developed which predicts the dependence of RSC on temperature coating thickness and the diffusion properties of the solution. In this case solvent is retained by the diffusional resistance to mass transfer and the diffusional resistance can be lowered by increasing temperature. However there are numerous claims that the RSC can also be reduced by using milder drying conditions

References and Abstracts

e.g. lowering airflow lowering temperature or partially saturating the air with solvent vapour. Such behaviour is anomalous and cannot be predicted by Fickian diffusion; this behaviour is termed anomalous skinning. Anomalous skinning in PMMA/acetone coatings is measured and a non-Fickian model is developed which predicts the anomalous behaviour. 23 refs.USA

Accession no. 863696

Item 365Polymer Preprints2001, 42, No.1, p.248SYNTHESIS OF VINYLOXY ACETATE/SILOXANE COPOLYMERS FOR USE ON E GLASS FIBERSMa R P; Le-Huy C; Britcher L G; Matisons J G

A vinyloxy acetate monomer was hydrosilated with triethoxysilane and applied to glass fibres where it condensed to form a siloxane polymer. The polymerised form of the vinyloxy acetate was also hydrosilated with a polysiloxane to form a polyvinyl acetate silicone and the hydrosilated products analysed by NMR spectroscopy. Surface characterisation of the glass fibres using DRIFT and SEM revealed that the silane acetate adsorbed strongly on the surface of the glass fibres. 3 refs.AUSTRALIA

Accession no. 862495

Item 366Polymer Preprints2002, 43, No.1, p.358EFFECT OF ION-INCORPORATION ON SEGMENTAL ORIENTATION OF POLYMER CHAINS AND GUEST/HOST INTERACTIONS IN ORIENTED POLYMER/DYE SYSTEMSPan B; Moore R B

There has been much research focused on using polymers as matrices for dichroic polarisers which are often employed in thin-film-transistor liquid crystal displays (TFT LCD) sunglasses and spectroscopic instruments. These materials are typically semicrystalline polymers such as polyvinyl alcohol (PVA) and PE with incorporated dichroic chromophore. EVOH and is ionomer version carboxylated EVOH (EVOH-COOH) are employed as the host polymers for cationic dyes. The orientation of the dyes in the two polymers is correlated to the orientation of polymer chains. The dye uptake rates for EVOH and the sodium form carboxylated EVOH (EVOH-COONa) are determined and rationalised with respect to ionic effects. The incorporation of the ionic groups into EVOH enhances the orientation of the dye molecules although the segmental orientation of polymer chains is not influenced. This enhancement may be attributed to the ionic interactions between dye molecules and the ionic groups on polymer chains. The small amount of ionic groups also changes

the morphology of the polymer with a reduction in the crystallinity which results in higher dye uptake rate in carboxylated EVOH comparing to the pristine EVOH. 10 refs.USA

Accession no. 860867

Item 367Iranian Polymer Journal11, No.2, 2002, p.123CROSS-LINKED POLY(VINYL ALCOHOL) HYDROGEL: STUDY OF SWELLING AND DRUG RELEASE BEHAVIOURVarshosaz J; Koopaie N

Crosslinked polyvinyl alcohol (PVA) is a prolonged-release micromatrix a hydrophilic polymer and a potentially interesting hydrogel which is useful for drug delivery applications. As a part of drug development procedure the aim is to investigate the effect of structural changes on drug release (theophylline) from this polymeric network. The parameters studied include: crosslinking agent (glutaraldehyde) concentration PVA content of the films theophylline percentage and their overall effect on swelling of the hydrogels drug loading efficiency diffusion and release characteristics of theophylline from PVA films. Changes in glutaraldehyde percentage (or crosslink density) affect the swelling of the films. However increasing PVA percentage causes more swelling. Drug loading efficiency is higher in gels with higher glutaraldehyde PVA and theophylline percentages. Increasing contents of PVA and theophylline promote the diffusion coefficient and drug release rate but glutaraldehyde has a reverse effect. The pH does not affect the swelling and diffusion coefficient. Water transport and drug release mechanism predominantly follow a Fickian model. It may be concluded that by changing the PVA structural parameters a rate-controlled drug release is obtained. 23 refs.

Isfahan University of Medical SciencesIRAN

Accession no. 860513

Item 368Iranian Polymer Journal11, No.2, 2002, p.93OBSERVATION OF NEWTONIAN RINGS ON PVA POLYMER DURING HF LASER-INDUCED PHYSICAL MODIFICATION USING AN OPTICAL FIBREKhosroshahi M E

The ablation of polyvinyl alcohol (PVA) with a multi-line 2.6-3.0 μm HF laser shows a strong interaction due to its relatively high absorption coefficient 7 x 104 cm-1 particularly hydrogen bands at 3597 cm-1. By using the expression heat diffusion limit surface temperature (Ts) of 340 K and 449 K are calculated for fluences of 0.3 and 1 J/cm2 respectively. The Ts values are well consistent with

References and Abstracts

the PVA melting point of 531 K and SEM photographs. With the average activation energy of 188 kh/mol-1 and rate constant of 6 x 107/s a value of K=6 x 10-6/s for T=(146-230) K is obtained. The thermal degradation effect in short pulse duration is evident by Newtonian rings which basically is an interference pattern created by light reflects off the boiling ablated material and the solid material underneath. 18 refs.

Tehran Amir Kabir UniversityIRAN

Accession no. 860510

Item 369Adhesive Technology19, No.3, 2002, p.24AUTOMOTIVE BINDING TAPE

A new PVOH binding tape for automotive thermal moulding techniques launched by Katco and Environmental Polymers is capable of perming at 190 deg.C which cuts moulding time and boosts productivity. Traditional cellulose tapes are not as strong as the PVOH tape as it cannot be used at above 160 deg.C and is likely to break when applied under stress. The new PVOH tape is also more thermally stable than existing forms. These old forms tend to expand at high temperatures which can result in parts being incorrectly formed says the company. Derek Hindson commercial director of Katco said 'an additional benefit of the new tape is that it leaves a glossy finish on the exterior of moulded rubber parts when the tape is removed. This gives parts a more professional and customer-friendly appearance and improves under-bonnet presentation.' The new PVOH automotive binding tapes are made from polymer pellets manufactured at Environmental Polymers' factory in Irlam near Manchester. This abstract includes all the information contained in the original article.

Katco; Environmental Polymers Gropup Plc.EUROPEAN COMMUNITY; EUROPEAN UNION; UK; WESTERN EUROPE

Accession no. 859978

Item 370

Journal of Applied Polymer Science85, No.5, 2002, p.957SWOLLEN BEHAVIOR OF CROSSLINKED NETWORK HYDROGELS BASED ON POLY(VINYL ALCOHOL) AND POLYDIMETHYLSILOXANE AMi-Seon Shin; Seon Jeong Kim; In Young Kim; Nam Gyun Kim; Chul Gyu Song; Sun I Kim

10 wt.% aqueous solution of polyvinyl alcohol (PVA) and a mixture of polydimethylsiloxane (PDMS) 1 wt.% 2, 2-dimethyl-2-phenylacetophenone and 0.5 mole% methylenebis acrylamide in isopropanol were prepared. The mixture was added to the PVA solution and heated at 90 deg.C over 7 hours. A number of crosslinked networks were obtained at 1:1 1:3 and 3:1 PVA/PDMS molar ratio and were characterised by FTIR DSC mechanical testing

and from the equilibrium water content (EWC). The DSC melting endotherms showed a sharp PVA peak 219.49 deg.C and the PVA/PDMS crosslinked networks had melting peaks close to this temperature. The EWC values were directly related to the PVA content of the crosslinked networks and were also dependent on temperature. 18 refs.

Hanyang University; Chonbuk National UniversitySOUTH KOREA

Accession no. 859712

Item 371Proceedings of GPEC 2002: Plastics Impact on the Environment held Detroit, MI2002, p.369RECENT ADVANCES IN THERMOPLASTICALLY-PROCESSABLE POLYVINYL ALCOHOL-BASED MATERIALSCooper T A; Harrison P E; Wilkes T M

PVOH has traditionally be usable or processable only in the form of aqueous solutions or films cast from these rather than as a thermoplastic. Recent advances in both PVOH formulating and processing technology are described which have resulted in the creation of a family of biodegradable and non-toxic PVOH-based materials to be produced for many thermoplastics applications using commercial melt processing methods without causing thermal or shear degradation. Examples are reviewed for biomedical waste management agricultural industrial and packaging applications which take advantage of uniquely advantageous PVOH properties in addition to its biodegradability. These properties are described. The products are claimed to represent viable environmentally advantageous alternatives to present non-degradable thermoplastics such as PE and PVC in which PVOH is stable during its intended use but which can be disposed of by dissolution and aqueous biodegradation composting incineration or recycling. 6 refs.EUROPEAN COMMUNITY; EUROPEAN UNION; UK; USA; WESTERN EUROPE

Accession no. 859626

Item 372International Journal of Polymeric Materials51, No.5, 2002, p.413THIN FILM DOSIMETERS BASED ON ROSE BENGAL DYED POLY(VINYL ALCOHOL)Aabdel-Fattah A A; Hegazy E-S A; El-Ahdal M A; Ezz-El-Din H

Dyed polyvinyl alcohol (PVA) films are prepared by casting the aqueous solutions of PVA incorporating Rose Bengal (RB) dye with or without chloral hydrate on a horizontal glass plate. Such films are useful as routine high-dose dosimeters. These flexible plastic film dosimeters are bleached when exposed to gamma-ray photons. The useful range of application of these films depends on the

References and Abstracts

concentration of chloral hydrate. RB/PVA film without chloral hydrate is suitable for application in the range of absorbed doses 10-150 kGy. The maximum range of RB/PVA films containing chloral hydrate ranges from 5 to 20 kGy depending on and inversely proportional to chloral hydrate concentration in the film. The radiation-chemical yield (G-value) of films is calculated to be in the range from 0.272 to 10.3 mu mol/J where it increases with the increase of both RB and chloral hydrate concentration in the film. The effects of temperature and relative humidity during irradiation as well as pre- and post-irradiation storage on the radiation response of films are studied. Although the response of these films depends on relative humidity during irradiation they are highly stable for long times before and after irradiation when stored in dark and they are not affected by temperature that range from 0 to 45 deg.C during irradiation. 21 refs.

Cairo National Center for Radiation Res.& Technol.EGYPT

Accession no. 858773

Item 373Environmental Polymers Ltd, Manchester2002, pp.6ENVIRONMENTAL POLYMERS PIONEERING BIODEGRADABLE PLASTICS

A general introduction to depart biodegradable non-toxic polymer products is presented. The material has been developed and commercialised by Environmental Polymers. The company has developed a patented process for extruding the PVOH pellets which can then be processed with minor modifications on existing equipment. The material is characterised by multi-dimensional strength and high puncture resistance. Its non-toxicity and gas barrier properties make it suitable for a wide range of food applications. It can also be used in multilayer applications. Environmental Polymers has developed the ability to customise the temperature at which depart dissolves which allows it to be used in a range of applications such as hospital laundry bags dosing pouches and additive sachets.EUROPEAN COMMUNITY; EUROPEAN UNION; UK; WESTERN EUROPE

Accession no. 858091

Item 374Journal of Applied Polymer Science84, No.14, 2002, p.2591CHARACTERIZATION OF HYDROGELS BASED ON CHITOSAN AND COPOLYMER OF POLY(DIMETHYLSILOXANE) AND POLY(VINYL ALCOHOL)Mi-Seon Shin; Kim S I; In Young Kim; Nam Gyun Kim; Chul Gyu Song; Seon Jeong Kim

Copolymers of polyvinyl alcohol (PVA) and PDMS were crosslinked with chitosan to produce semi-interpenetrating

polymer network hydrogels using UV irradiation. Photocrosslinked hydrogels had an equilibrium water content of 65-95%. The swelling behaviours of the hydrogels were studied by immersing the gels in various buffer solutions. The hydrogel with the highest chitosan weight ratio showed the highest equilibrium water content in time dependent and pH dependent swelling. These hydrogels may have potential biomedical applications. 19 refs.

Korea Orthopedics & Rehabilitation Engineering Center; Hanyang University; Chonbuk National UniversityKOREA

Accession no. 857068

Item 375Polymer International51, No.6, 2002, p.502BENDING BEHAVIOUR OF ELECTRORESPONSIVE POLYVINYL ALCOHOL/POLYACRYLIC ACID SEMI-INTERPENETRATING NETWORK HYDROGEL FIBRES UNDER AN ELECTRIC STIMULUSFei J; Zhang Z; Gu L

Polyvinyl alcohol (PVA) and polyacrylic acid (PAA) composite fibres are prepared via solution spinning and subsequently semi-interpenetrating networks (SIPN) are obtained by crosslinking the fibres with glutaraldehyde. The hydrogel fibres exhibit bending behaviour under DC electric stimulation. The effects of a number of factors are systematically studied including the PAA content within the network electric voltage imposed across the fibre the fibre diameter concentration of the crosslinking agent pH and ionic strength of the bath solution. Experimental results show a stable reversibility of bending behaviour under the applied electric field. The degree of bending at equilibrium and the bending speed of the hydrogel fibre increase with the intensity of the applied electric voltage and the PAA content having negatively charged ionic groups within the SIPN. The electroresponsive behaviour of the present SIPN hydrogel fibre is also affected by the aforementioned extrinsic factors. These observations are interpreted in terms of fibre stiffness fixed charge density and swelling pressure which depend on the hydrogel equilibrium states in different pH and ionic environments together with the electrochemical reactions under DC electric field. 35 refs.

Shanghai Donghua UniversityCHINA

Accession no. 856924

Item 376Polymer43, No.13, 2002, p.3653

References and Abstracts

MISCIBILITY ENHANCEMENT ON THE IMMISCIBLE BINARY BLEND OF POLY(VINYL ACETATE) AND POLY(VINYL PYRROLIDONE) WITH BISPHENOL AShiao-Wei Kuo; Shih-Chi Chan; Feng-Chih Chang

The influence of additions of bisphenol A (BPA) on the miscibility of blends of poly(vinyl acetate) (PVAc) and poly(vinyl pyrrolidone) (PVP) was studied using differential scanning calorimetry and Fourier transform infrared spectroscopy (FTIR). Binary blends of BPA with PVAc and with PVP exhibited single glass transition temperatures (Tg) confirming miscibility over the entire compositional range. Hydrogen bonding between the hydroxyl group of BPA and the carbonyl group of PVAc and PVP was studied using FTIR. Enhanced miscibility of PVAc/PVP binary blends was observed with increasing BPA additions with a single Tg confirming full miscibility at sufficiently high additions. 40 refs.

Taiwan National Chiao Tung UniversityTAIWAN

Accession no. 856034

Item 377Journal of Membrane Science202, No.1-2, 2002, p.89MEMBRANE OF PVA COATED ON POROUS CATALYTIC CERAMIC DISKS SUPPORTED H3PW12O40Qing-Lin Liu; Qing-Biao Li

Catalytic discs of porous ceramic plate-supported H3PW12O40 were prepared. Crosslinked PVAl composite membranes using the catalytic discs as matrices were obtained by spin coating. The dehydration reaction of butanediol to form THF was used as a model reaction to demonstrate the catalytic activity of the disc and the latter was shown to be more effective than the original H3PW12O40. The separation properties of the membrane were also examined by pervaporation using the same reacting mixture and the water content in the reactor was much less than that of THF during the reaction coupled pervaporation. 13 refs.

XiamenUniversityCHINA

Accession no. 854753

Item 378Journal of Applied Polymer Science84, No.8, 2002, p.1572ELABORATION OF ION-EXCHANGE MEMBRANES WITH SEMI-INTERPENETRATING POLYMER NETWORKS CONTAINING POLY(VINYL ALCOHOL) AS POLYMER MATRIXLebrun L; Da Silva E; Metayer M

Ion-exchange membranes were obtained with semi-interpenetrating networks (s-IPN) by mixing film-forming polymer polyvinyl alcohol (PVA) for the crosslinked matrix and a polyelectrolyte to give the specific ion exchange property. The anionic polyelectrolytes used were: poly(sodium styrenesulphonate)(PSSNa) poly(styrenesulphonic acid)(PSS) polyacrylic acid (PAA) polyethyleneimine (PEI) poly(11-dimethyl-35-dimethylenepiperidinium chloride)(PDDPCl) and poly(diallyldimethylammonium chloride)(PDDMACl) as cationic polyelectrolytes. Membranes containing 60% PVA and 40% polyelectrolyte showed the best compromise of mechanical properties hom*ogeneity and ion-exchange properties. The crosslinking agent for the PVA network to promote efficient entrapment of the polyelectrolyte in the membrane was gaseous dibromoethane. The crosslinking time (tc) for each type of membrane was optimised and its effect was studied by thermogravimetric analysis and scanning electron microscopy. The best results i.e. high ion-exchange capacity combined with small swelling ratio were obtained with PVA/PAA and PVA/PSSNa/PSS membranes. Of the anion exchange membranes PVA/PEI gave the best permselectivity and the highest ion exchange capacity. 20 refs.

Rouen UniversityEUROPEAN COMMUNITY; EUROPEAN UNION; FRANCE; WESTERN EUROPE

Accession no. 853715

Item 379JIS-K9550.

POLYVINYL ALCOHOL JAPAN

Accession no. 852709

Item 380Polymer Preprints2001, 42, No.2, p.328ULTRA-THIN COATINGS OF POLYVINYL ALCOHOL DEPOSITED ON ORGANIC MONOLAYERSKozlov M; McCarthy T J

Surface modification of many organic and inorganic substrates still represents a challenging problem. In particular there are only a few reactions allowing chemical modification of the surface of hydrophobic polymers such as polyolefins and fluoropolymers. It has recently been shown that polyvinyl alcohol (PVOH) possesses a unique property of adsorption on the surface of polytetrafluoroethylene-co-hexafluoropropylene (FEP) from aqueous solution. Such adsorption not only increases the surface energy of the substrate rendering it hydrophilic but also introduces hydroxyl groups to the surface that are readily reactive towards a range of surface modifying agents. This makes PVOH potentially a versatile tool for surface modification of many substrates. The adsorbed PVOH coatings are

References and Abstracts

presumably stabilised by intermolecular hydrogen bonds. It has long been known that adsorption of fully hydrolysed grades of PVOH at the air-water interface is accompanied by a gain in enthalpy (unlike most other water-soluble polymers) which is ascribed to formation of hydrogen bonds. Several organic monolayers are prepared by surface modification of silicone wafers and the adsorption of PVOH from aqueous solutions on these surfaces is studied. Deposition of PVOH on organic monolayers is found to be strongly dependent on the nature of the substrate and the solution conditions. PVOH coatings are formed preferably on more hydrophobic surfaces whereas hydrophilic substrates such as PEO-terminated monolayers do not support the formation of PVOH coatings. Salt content in the solution is shown to have a two-fold effect enhancing hydrophobic interactions and thus promoting adsorption but at the same time impeding aggregation of adsorbed polymer by means of hydrogen bonding. 7 refs.USA

Accession no. 849815

Item 381Polymer Preprints2001, 42, No.2, p.17DYNAMICS OF POLYVINYL ACETATE-D3 ON SILICAO'Connor R D; Xu G; Blum F D

PVAc is an important polymer in applications due to both its bulk and surface characteristics. Its chain architecture gives it a low Tg and generally good qualities for processing and applications which include paints adhesives thin films and surface coatings. The surface dynamics of PVAc absorbed onto silica are investigated with 2H-NMR. For dynamics studies 2H-NMR is an excellent technique as it uses an innocuous probe that can report on correlation times (Tc) from approximately 10-8s to 10s. The use of two-dimensional exchange NMR (2D-X) and a side-chain methyl-d3 probe to investigate surface dynamics with Tcs in the range of 10-6 to over 1 s is reported. 2D-X NMR can be applied to very thin layers of polymers and yield information about polymer reorientation. More thorough analysis needs to be done to extract the motional note rates and angular excursion from this data. However it is clear from the spectra that the majority of surface PVAc species are much less mobile than in bulk. 4 refs.USA

Accession no. 847948

Item 382Polymer Preprints2001, 42, No.2, p.7RELAXATION DYNAMICS IN THIN FILMS OF POLYVINYL ACETATE AND POLYMETHYL METHACRYLATEf*ckao K; Uno S; Miyamoto Y; Hoshino A; Miyaji H

Recent progress in theoretical and experimental studies has clarified many properties of glass transitions. However the mechanism of the glass transition has not yet been fully understood. The major problem to be achieved is the experimental approach to the investigation of the length scale of the glass transition and dynamics of the alpha-process such as dynamical heterogeneity. For this purpose the glass transition in thin films of polymers especially PS has widely been investigated by using different experimental techniques and many interesting properties of the thin films have been observed. It is interesting to check whether the results extracted from the investigations on PS thin films hold also for other polymers. The dynamics of thin films of polyvinyl acetate and PMMA are investigated by dielectric relaxation spectroscopy in order to clarify this question. 6 refs.JAPAN

Accession no. 847943

Item 383Journal of Applied Polymer Science83, No.2, 2002, p.244SYNTHESIS OF GRAFT COPOLYMERIC MEMBRANES OF POLY(VINYL ALCOHOL) AND POLYACRYLAMIDE FOR THE PERVAPORATION SEPARATION OF WATER/ACETIC ACID MIXTURESAminabhavi T M; Naik H G

Graft copolymers of polyvinyl alcohol with polyacrylamide were synthesised and then membranes were prepared at 48 and 93 percent grafting of acrylamide. These membranes were used in the pervaporation separation of water and acetic acid. The separation characteristics of the membranes were compared with neat PVA membrane at 25 35 and 45 degree C. The values of separation selectivity diffusion coefficient and permeation flux were calculated. These parameters were sensitive to the amount of water in the feed mixture. The highest separation selectivity value of 23 was observed for neat PVA at 25 degree C and the lowest value of 2.2 for 93 percent acrylamide grafted PVA. The temperature dependency of the permeation flux as well as diffusion followed an Arrhenius relationship. The grafted copolymer membranes were found to be effective in the selective separation of acetic acid from its aqueous mixture. 23 refs.

Karnatak UniversityINDIA

Accession no. 846611

Item 384Journal of Applied Polymer Science82, No.1, 2001, p.143PREPARATION OF POLYVINYL ALCOHOL HYDROGEL THROUGH THE SELECTIVE COMPLEXATION OF AMORPHOUS PHASEHari P R; Sreenivasan K

References and Abstracts

A highly elastic polyvinyl alcohol (PVA) hydrogel film was prepared using a new simple and mild complexation reaction with phenyl boronic acid and its morphology mechanical properties and cytotoxicity were investigated. The changes in morphology and mechanical properties of PVA on complexation were determined by comparison with a reference sample of glutaraldehyde cross linked PVA film. The morphological changes were examined using differential scanning calorimetry (DSC) wide angle X-ray diffraction (WAXD) and scanning electron microscopy (SEM). DSC showed that the complexation reaction is confined in the amorphous region of the PVA. Investigation by WAXD showed that the PVA hydrogel film retains the inherent crystalline property of the semi-crystalline PVA. SEM found no change in the surface morphology of the PVA film resulting from this reaction. The PVA hydrogel film displays enhanced mechanical properties particularly in the wet condition resulting from its intact crystallinity. Also the inherent non-toxic characteristic property of PVA is unaffected by this complexation reaction. Consequently as the reaction can be performed under mild aqueous conditions and does not leave behind a toxic residue it may have very good potential in the biomedical and pharmaceutical fields. 12 refs.

Sree Chitra Tirunal Inst.for Med.Sci.& TechnologyINDIA

Accession no. 844693

Item 385Journal of Applied Polymer Science82, No.1, 2001, p.136SORPTION OF DYE WASTES BY POLY(VINYL ALCOHOL)/POLY(CARBOXYMETHYL CELLULOSE) BLEND GRAFTED THROUGH A RADIATION METHODEl-Salmawi K M; Abu Zaid M M; Ibraheim S M; El-Naggar A M; Zahran A H

A polyvinyl alcohol (PVA)/CMC blend graft copolymer was used as a sorbent for dye wastes normally released from textile factories. The parameters that may affect the sorption process for example time temperature weight of the blend graft copolymer and volume of the dye waste were investigated. The PVA/CMC blend graft copolymer was prepared by radiation induced grafting of a styrene monomer on a PVA/CMC blend which improved its stability in water. The sorption of dyestuffs by the blend was determined by a method based upon spectrophotometric analysis. The blend graft copolymer has a high affinity for basic acid and reactive dyes. The sorption of dyes depends on the weight of the copolymer and not on the volume of the waste solution also it is more effective at 70C. The sorption of dyestuffs by a PVA/CMC graft copolymer could be used as a practical method to remove organic pollutants. 6 refs.

Egypt National Centre for Radiation Res.& Technol.EGYPT

Accession no. 844692

Item 386Macromolecules34, No.22, 2001, p.7894SPINODAL DECOMPOSITION AND SYNERESIS OF PVA GELTakesh*ta H; Kanaya T; Nishida K; Kaji K

Transparent gels of poly(vinyl alcohol) (PVA) were prepared by quenching a hom*ogeneous solution of PVA in dimethyl sulphoxide/water (60:40) at 100 C to a temperature of -40 C. Phase separation was studied by measurements of UV transmittance time-resolved light scattering and volume changes. There was a single light scattering intensity peak which increased exponentially with time indicating spinodal decomposition. Domain growth was slowed in the later stages attributed to suppression of surface tension forces by the elastic force of the gel. Towards the end of the spinodal decomposition phase during shrinkage the UV transmittance gradually increased and the scattering intensity decreased corresponding to a relaxation process of internal fluctuations produced during spinodal decomposition. 36 refs.

Kyoto UniversityJAPAN

Accession no. 843608

Item 387Polymer Journal (Japan)33, No.8, 2001, p.610SYNTHESIS OF POLY(VINYL ALCOHOL)GRAFT COPOLYMERS BY LIVING CATIONIC POLYMERIZATION IN THE PRESENCE OF ADDED BASES. PART 1. DESIGN AND SYNTHESIS OF POLY(VINYL ALCOHOL)GRAFT COPOLYMERS WITH WELL CONTROLLED POLY(VINYL ETHER)GRAFTSAoshima S; Ikeda M; Nakayama K; Kobayashi E; Ohgi H; Sato T

Partially hydrolysed polyvinyl acetate was employed as a new coupling agent for synthesising polyvinyl alcohol graft copolymers using living cationic polymerisation of vinyl ethers. Size exclusion chromatography was used to obtain the molecular weight distributions and nuclear magnetic resonance spectroscopy to determine the molecular structure of the graft copolymers. The resulting copolymers contained well controlled polyvinyl ether grafts with a narrow molecular weight distribution and good solubility. Graft copolymers with either polymethoxyethyl vinyl ether or polyethoxy vinyl ether chains exhibited thermosensitive phase separation in water. Full details of the synthesis and test results is given with detailed results discussion. 21 refs.

Osaka University; Tokyo Science University; Kuraray Co.JAPAN

Accession no. 843499

References and Abstracts

Item 388Journal of Applied Polymer Science82, No.13, 2001, p.3215PREPARATION AND CHARACTERISATION OF POLYVINYL ALCOHOL-BASED MAGNETIC NANOCOMPOSITES. I. THERMAL AND MECHANICAL PROPERTIESLopez D; Cendoya I; Torres F; Tejada J; Mijangos C

CoFe2O4 magnetic nanoparticles are prepared by in situ precipitation and oxidation of Co2+ and Fe2+ within a sulphonated PS resin. The nanometric particles are characterised by X-ray diffraction. A ferrofluid is prepared from the CoFe2O4 mineralised polymer resin and water. Polyvinyl alcohol (PVA)-based nanocomposite materials are obtained by mixing different amounts of ferrofluid (compositions ranging within 0-51 wt.% of mineralised resin) with an aqueous solution of the polymer. The PVA composite materials are characterised by TGA DSC and stress-strain testing. The thermal and mechanical properties of PVA change with filler content exhibiting an initial increase in these properties due to polymer-filler interactions. After a maximum value at about 15 wt.% of mineralised resin the mechanical properties decrease probably due to particle aggregation which causes phase separation. The results obtained show that the nanoparticles are dispersed in the amorphous regions of the polymer the crystalline zones remaining unaltered up to compositions as high as 30 wt.%. 36 refs.

CSIC; Barcelona UniversityEUROPEAN COMMUNITY; EUROPEAN UNION; SPAIN; WESTERN EUROPE

Accession no. 842144

Item 389Journal of Applied Polymer Science83, No.4, 2002, p.929THERMAL AND MECHANICAL BEHAVIOURS OF POLYVINYL ALCOHOL-LACTOSE BLENDSFan X-D; Hsieh Y-L; Krochta J M

Thermal and mechanical behaviours of polyvinyl alcohol (PVA)-lactose blends are studied by differential scanning calorimetry thermogravimetric analysis and stress-strain analysis. The increase in glass transition temperature of the PVA lactose blends with lactose contents suggests the formation of hydrogen-bonded PVA lactose complex in the PVA matrix. The hydrogen bonding interactions can improve thermal and mechanical properties of the blends. Results of this study demonstrate that lactose a by-product of dairy industry can be used directly and in substantial quantity as a modifier to enforce the physical properties of PVA. 24 refs.

Xian Northwestern Polytechnical University; California UniversityCHINA; USA

Accession no. 842048

Item 390POLYVINYL ALCOHOL - DEVELOPMENTSFinch C A

This book is the second edition of a book titled 'Polyvinyl alcohol: properties and applications' and the authors contributing to this present volume have all written with the understanding that the first volume will be available to the reader. The first group of chapters describe progress within particular topics described in the first book namely: general properties of the polymer; methods of preparation and hydrolysis; modifications by copolymerisation. Further chapters go on to discuss ethylene-vinyl copolymers chemical reactions and stereochemistry and applications. Applications discussed are relating to the following fields: textile sizing films paper manufacture adhesives binder reprography and photoresists. Each chapter is well referenced.PENTAFIN ASSOCIATES; CHICHESTER JOHN WILEY & SONS INC. 1992 PP.XX 850

Accession no. 841910

Item 391Polymer42, No.10, 2001, p.4687TEMPERATURE DEPENDENCE OF THE MORPHOLOGY AND MECHANICAL PROPERTIES OF POLY(VINYL ALCOHOL) DRAWN FILMS PREPARED BY GELATION/CRYSTALLIZATION FROM SOLUTIONS BY X-RAY AND SOLID STATE 13C NMRMatsuo M; Bin Y; Nakano M

The morphology and mechanical properties of PVA were studied using atactic PVA (at-PVA) dry gel films prepared by crystallisation from solutions in dimethyl sulphoxide and water mixtures in which the Me2SO/water composition was set to be 60:40. The hot hom*ogenised solution was quenched by pouring it into an aluminium tray at -80C thus generating a gel. The crystal lattice modulus along the chain axis was measured by XRD. The values were 200-220 GPa independent of temperature up to 170C. However the values became lower with further increase in temperature and the value at 200C was 133 GPa. This tendency differs from previous reports showing rapid decrease in the crystal modulus at higher temperature than 120C. The difference means that crystallites within the specimens prepared by quenching the solution at -80C are in much more stable state than those of the previous specimens. In spite of the temperature independence of the crystal modulus along the chain axis and the crystallinity the storage modulus similar to Young's modulus decreases gradually with increasing temperature. To study the mechanical properties and molecular orientation of the present specimens with the stable crystallites the orientational behaviour of crystallites was estimated in terms of the orientation distribution function of crystallites and Young's modulus was calculated by using the generalised orientation factors of crystallites and

References and Abstracts

amorphous chain segments estimated from the orientation functions of crystallites and amorphous segments. In doing so the theoretical calculation was carried out by using a three-dimensional model in which the oriented crystalline layers are surrounded by an anisotropic amorphous phase and the strains of the two phases at the boundary are identical. The theoretical values were in good agreement with the experimental ones. The 13C-NMR measurements suggested that the intermolecular hydrogen bonds may be broken by drawing and the intramolecular hydrogen bonds are more preferably formed in the mm and mr sequences with draw ratio but no marked difference in the structure exists between the crystalline and non-crystalline regions as judged from the hydrogen bonding in the triad sequences. Even so the spin-lattice relaxation time decreased drastically with increasing temperature reflecting drastic activity of chain mobility. Accordingly the drastic decrease in Young's modulus (the storage modulus) is thought to be due to the fact that chain mobility in the amorphous phase becomes more pronounced as temperature increases. 49 refs.

Nara Women's UniversityAccession no. 841018

Item 392Polymer Preprints2000, 41, No.2, p.1685ATTACHMENT OF PROTEINS TO POLYVINYL ALCOHOL FOR BIOMEDICAL APPLICATIONSNuttelman C R; Anseth K S

The ability to covalently attach proteins and other macromolecules to a polymer support material presents numerous advantages for a wide range of biomedical applications. For example attachment of water-soluble polymers such as polyethylene glycol and dextran can increase the solubility of the final macromolecular structure and their overall biocompatibility. The naturally-occurring polysaccharide dextran has been used to transport anticancer drugs to turner sites in vivo and has been used as a stabiliser of enzymes and other proteins. Alternatively transport of macromolecules across cell membranes can be made more efficient by attaching them to polyethylene glycol. In addition polyethylene glycol can be used to prevent protein adsorption to surfaces. An attempt is made to covalently incorporate biologically-active macromolecules onto a polyvinyl alcohol (PVA) macromer that can be photopolymerised to form a hydrogel matrix. The abundant pendant hydroxyl groups on PVA can be modified to attach drugs adhesion peptides growth factors and other macromolecules to the polymer backbone. Depending upon the chemistry of the polymer-macromolecule attachment a variety of unique responses can occur in a wide range of biomedical applications including tissue engineering and drug delivery. 5 refs.USA

Accession no. 839988

Item 393Journal of Polymer Science: Polymer Chemistry Edition39, No.20, 2001, p.3633ROLE OF GRAFTING IN THE EMULSION POLYMERIZATION OF VINYL ACETATE WITH POLY(VINYLALCOHOL) AS AN EMULSIFIER. I. EFFECT OF THE DEGREE OF BLOCKINESS ON THE KINETICS AND MECHANISM OF GRAFTINGBudhlall B M; Sudol E D; Dimonie V L; Klein A; El-Aasser M S

The role of grafting in particle nucleation during the emulsion polymerisation of vinyl acetate with partially hydrolysed polyvinyl alcohol (PVAl) as an emulsifier and potassium persulphate as an initiator was investigated. The polymerisations were carried out in batch with a low solids recipe. The kinetics of the emulsion polymerisations were measured using three medium molecular weight PVAls. The reaction kinetics particle number evolution and development of grafting were followed. Rates of polymerisation were found to be independent of the PVAl type. The particle nucleation was continuous and accompanied by extensive limited aggregation during the particle growth stages. The PVAls had different degrees of blockiness and the PVAl with a higher degree of blockiness led to nucleation and stabilisation of more particles. At higher conversions greater than 55% the total amount of grafted PVAc was independent of the degree of blockiness of the PVAl as seen by similar grafting efficiencies of PVAc for both PVAls. The largest amount of grafting of the PVAl stabiliser occurred early in the reactions contributing to the stabilisation of the particles. Further nucleation without measurable grafting indicates a hom*ogeneous nucleation mechanism with absorption of aqueous phase PVAl and redistribution and previously adsorbed PVAl to particle stability. 24 refs.

Lehigh UniversityUSA

Accession no. 836791

Item 394Polymer Preprints2000, 41, No.2, p.1580EFFECT OF DEGREE OF SAPONIFICATION ON THE PHYSICOCHEMICAL PROPERTIES OF HIGH MOLECULAR WEIGHT SYNDIOTACTIC POLYVINYL ALCOHOL SOLUTIONLyoo W S; Choi J H

The tacticity of a polymer has a profound influence on physical properties. Recently it was found that a polyvinyl pivalate (PVPi) of high syndiotactic diad (s-diad) content developed a well-oriented microfibrillar structure during saponification and gave rise to a fibrous PVA product. The in situ fibrillation during saponification was true only for PVPi which has high s-diad content but not feasible with polyvinyl acetate having relatively low s-diad

References and Abstracts

content suggesting that tacticity plays a significant role in the in situ fibrillation process together with an increase in rigidity of the polymer molecules by changing the chemical structure of the polymer from PVPi to PVA. In addition rheological characterisation of PVA solutions with different syndiotactic diad contents reveals that PVAs of s-diad content 63-65% gives rheological responses similar to the liquid crystalline polymer while those of 52-53% exhibit rheological properties typical of most flexible polymers. Among the molecular parameters of PVA including stereoregularity degree of saponification (DS) is quite a notable one because residual ester groups on side chains hinder hydrogen bonding interaction between the chains. As pivaloyl groups change into hydroxyl ones i.e. as DS increases during saponification highly crystalline and oriented PVA fibres are produced. Spontaneous orientation of polymer molecules during saponification of PVPi is traced considering DS of the polymer on rheological bases. 10 refs.KOREA

Accession no. 836612

References and Abstracts

Subject Index

A(ATR-FTIR) SPECTROSCOPY, 35AC IMPEDANCE

SPECTROSCOPY, 61ACID HYDROLYSIS, 79ACRYLIC ESTER POLYMERS, 96ACTIVE PACKAGING, 13 14ADAM-GIBBS-SCHERER (AGS)

MODELS, 32ADEPT POLYMERS, 90ADSORPTION, 80AEROGELS, 36AFM, 73AG-PVA NANOCOMPOSITES, 48ALCOHOLYSIS, 52ALDOLASE, 97ALOE VERA, 96AMORPHOUS POLYMERS, 47ANAEROBIC

BIODEGRADATION TESTING, 20

ANOMALOUS SKINNING, 111ATMOSPHERIC PRESSURE

PLASMA TREATMENT, 101ATOM TRANSFER RADICAL

POLYMERISATION (ATRP), 25ATOMIC FORCE MICROSCOPY

(AFM), 62ATOMIC FORCE MICROSCOPY

HIGH RESOLUTION ELECTRON MICROSCOPY, 29

ATOM-TRANSFER RADICAL POLYMERISATION, 26 73

AUTOMOTIVE THERMAL MOULDING TECHNIQUES, 112

AZEOTROPIC MIXTURE, 77

BBIODEGRADABLE BONE

SUBSTITUTES, 29BIODEGRADABLE

MATERIALS, 3BIODEGRADABLE

PACKAGING, 13 15BIODEGRADABLE PLASTIC, 18

19 21 22 23BIODEGRADABLE PLASTICS

DISPOSAL, 20BIODEGRADATION TEST, 109BIOFILTER OPERATION, 76

BIOMINERALISATION, 105BIOPOLYMERS, 14 15 19 21BIOSENSOR APPLICATIONS, 57BLOW MOULDING, 11 13

CCALORIMETRY, 59CANCER THERAPY, 53CAPROLACTONE

hom*oPOLYMERISATION, 52CARBON NANOTUBES (CNTS),

27 43CARBOXYMETHYL

POLYVINYL ALCOHOL (CMPVA), 28

CAST-HYBRID FILMS, 38CELL CULTURE, 65CELLULOSE BIOPOLYMERS, 16CELLULOSE NANOFIBROUS

MAT (CNM), 27CEMENT MORTARS, 54 60CHEMIRESISTORS, 103CHITIN, 16CHITOOLIGOSACCHARIDE, 91CHITOSAN, 31 32 56 58 69 78 89

99 113CHROMAMETER, 83CHROMATOGRAPHY, 42CLAY AEROGELS, 55COATING AGENT, 26COBALT MEDIATED RADICAL

POLYMERISATION, 43 73COLD-MIX ASPHALT (CMA), 57COMPOSTABLE PLASTIC, 18COMPOSTING, 22CONONSOLVENCY, 98CONTACT ANGLE

MEASUREMENTS, 62COOMASSIE BRILLIANT BLUE

DYE, 80COPOLYESTER ELASTOMER, 83COPOLYMERISATION, 55 71 78

96 100 102 117CORN STARCH ACETATES, 37CRYOGELS, 78, 86CRYSTALLISATION, 93 96 117CUT-OUT FILTER, 95CYCLIC VOLTAMMETRY (CV)

ANALYSIS, 61CYCLIC VOLTAMMETRY

SCANNING ELECTRON MICROSCOPY, 82

DDEACETYLATION, 67DEGRADABILITY, 18DEGRADABLE PLASTIC, 18DEGREE OF SAPONIFICATION

(DS), 119DESORPTION, 93DIELECTRIC RELAXATION

SPECTROSCOPY (DRS), 46 115

DIELECTRIC SPECTROSCOPY, 94

DIFFERENTIAL SCANNING CALORIMETER (DSC), 31 32 33 39 40 45 50 52 62 68 71 73 74 78 82 96 103 106 116

DIFFERENTIAL SCANNING CALORIMETRY TRANSMISSION ELECTRON MICROSCOPY, 36

DIFFERENTIAL THERMO GRAVIMETRY (DTG), 52

DYE SORPTION, 100DYESTUFFS, 99 100DYNAMIC MECHANICAL

THERMAL ANALYSIS, 91DYNAMIC-MECHANICAL

THERMAL SPECTROSCOPY, 47

EELECTROCHEMICAL

IMPEDANCE SPECTROSCOPY (EIS), 45

ELECTRON IRRADIATION, 30ELECTRON SPIN RESONANCE,

104ELECTROSPINNING, 10 31 55 57

60 65 67 75 78 82 84 91 100ELLIPSOMETRY, 108EMULSIFIER-FREE EMULSION

POLYMERISATION, 71EMULSION POLYMERISATION,

29 60 69 79 80 81 83 102 118ENZYMATIC DEGRADATION, 97ENZYME CELLULASE, 78ENZYME IMMOBILISATION, 57ENZYME-LINKED

IMMUNOSORBENT ASSAY (ELISA) TECHNIQUES, 63

EXPLOSIVE PLASTICS, 95

Subject Index

EXTRUSION, 8 11 12EYRING’S VISCOSITY, 61

FFABRY-PEROT ETALON, 29FE-SEM TEM SQUID

MAGNETOMETRY, 25FICKIAN DIFFUSION, 111FIELD EMISSION SCANNING

ELECTRON MICROSCOPY (FE-SEM), 38 91

FILM BLOWING, 8 11 13FILM MOULDING, 12FINEMAN-ROSS METHOD, 96FLAME PLASMA SURFACE

TREATMENT, 48FOURIER TRANSFORM

INFRARED RAMAN FLUORESCENCE, 54

FOURIER TRANSFORM INFRARED SECTROSCOPY, 28 29 31 33 35 38 39 45 52 58 62 63 68 72 73 75 78 84 86 89 103 106 114

FOURIER TRANSFORM INFRARED/THERMOGRAVIMETRIC ANALYSIS (FTIR/TGA), 49

FOUR-PROBE TECHNIQUE, 82FOX LAW, 52FREE RADICAL

POLYMERISATION, 26 41 69 85

FREEZE-THAW CYCLE, 56 59 72 81 86

FUEL CELL, 77FUJII T, 26FURUYA Y, 26

GGAMMA-CYCLODEXTRIN, 81GAS CHROMATOGRAPHY, 26GASEOUS PLASMA

TREATMENT, 88GEL, 92 99GEL FORMATION, 64GEL FRACTION, 72GEL PERMEATION

CHROMATOGRAPHY, 43 54GEL SPINNING, 79 81GEL SWELLING, 72GELATIN, 16 76 77 85 98 109 110

117GELS, 64 77 82 98 116GLUTARALDEHYDE

ACETALIZATION, 31

GRAFT COPOLYMERISATION, 71 85 97 102 115 116

GRAFTING, 50 51 58 80 86 87 107 118

GRAVIMETRY, 101GREEN POLYMER, 3

HHEAT-TREATMENT METHOD,

53hom*oPOLYMERISATION, 25HYBRID MATERIALS 51, 91HYBRID POLYMERIC

NETWORKS (HPN), 45HYDRAULIC FRACTURING, 28HYDROGEL, 13 14 27 28 32 36 38

39 43 45 53 56 57 59 60 61 63 66 71 72 72 78 78 79 81 82 84 86 89 92 94 96 97 100 101 103 106 110 111 113 115

HYDROGEN NUCLEAR MAGNETIC RESONANCE (1H NMR), 68

HYDROLASE, 7 8 9 10 11 17 25 30 51 54 58 59 77 79 89 90 97, 101 109

HYDROLYTICALLY DEGRADABLE PLASTIC, 18

HYDROPHILICITY, 85 99HYDROXYAPATITE

NANOFILLERS, 47HYGROSCOPY, 10

IICE SLURRIES, 61INCINERATION, 22INFRARED SPECTROSCOPY

SWELLING, 40INFRARED SPECTROSCOPY

THERMAL ANALYSIS, 46INJECTION MOULDING, 8 11 12

13 29 83INTEGRATED PRODUCT

POLICY (IPP) PROGRAMMES, 20

IR SPECTROSCOPY, 32 108ISOTACTIC STAR-SHAPED

POLY(VINYL ALCOHOL), 30

KKELEN-TUDOS METHODS, 96

LLANDFILLING, 23LATEX PAINTS, 92LATICES, 60LIGNOCELLULOSES, 96 97LIPASE IMMOBILIZATION, 63LIPIDS, 16LIVING CATIONIC

POLYMERISATION, 54 116LIVING RADICAL

POLYMERISATION (LRP), 35

MMACROMOLECULAR DESIGN

VIA THE INTERCHANGE OF XANTHATES (MADIX) PROCESS, 42

MACROPORES, 29 89MADIX/RAFT

POLYMERIZATION, 70MAGNETIC POLY(VINYL

ALCOHOL) (PVA) BEADS, 39MAGNETOMETRY

MEASUREMENTS, 84MASS-SPECTROMETRY (MS), 46MAXWELL-WAGNER THEORY,

64MELT GRAFTING, 80MELT MIXING, 87MELT PROCESSING, 11MELT SPINNING, 4 11MERCAPTIDE THERMOLYSIS,

43MERCURY DILATOMETRY, 32METHANOL FUEL CELL

APPLICATIONS, 45METHYLENEBISACRYLAMIDE,

59MICROSPHERES, 28MINI-EMULSION

COPOLYMERISATIONS, 27 86 87

MODIFIED MONTMORILLONITE (MMT), 63 64

MOISTURE SORPTION, 76MOONEY VISCOSITY, 36MORPHOLOGY, 50 51 54 55 56

59 65 70 71 75 82 90 91 93 98 104 106 111 116 117

MULCHING, 109MULTI-JET

ELECTROSPINNING, 91MULTIWALL CARBON

NANOTUBES (MWNTS), 27 70

Subject Index

NNANOCARBON MATERIALS,

25 26NANOCLAY, 74 75NANOFIBRE

ELECTROSPINNING, 31NANOG, 29NEAR INFRARED

SPECTROSCOPY (NIR), 52NEWTONIAN RINGS, 112NITROGEN PLASMA

TREATMENT, 89NMR, 33 49 52 55 71 84 111NOAMI M, 26NUCLEAR MAGNETIC

RESONANCE SPECTROSCOPY, 26 36 40 42 43 50 54 67 116

OONE-PASS TEMPERATURE-

PROGRAMMED DESORPTION (OPTPD), 46

OSTWALD RIPENING, 61OXIDATIVELY DEGRADABLE

PLASTIC, 18OXYGEN-SENSITIVE FILMS, 70

PPARALLELPLATE

RHEOMETRY, 85PHASE INVERSION

TECHNIQUE, 98PHENOL RESIN EMULSION, 75PHOTOCURING, 92PHOTODEGRADABLE

PLASTIC, 18 20PHOTOINDUCED

LIVING RADICAL POLYMERIZATION, 26

PHOTOLUMINESCENCE (PL), 108

PLASTICIZER, 65PMR SPECTROSCOPY, 101POLARISING FILMS, 76POLARIZED-LIGHT OPTICAL

MICROSCOPY (POM), 50POLY (VINYL ALCOHOL)

APPLICATION, 4POLY (VINYL ALCOHOL)

MANUFACTURE, 6POLYESTER (PES) SYSTEM, 39

82POLYETHYLENE FILMS, 27POLYMER EMULSION

ADHESIVES, 74POLYMER HYDROPHOBIC, 67POLYMER LATICES, 97POLYMER MATRIX, 27 52 94 114POLYMERISATION, 4 6 7 9 10 11

15 26 27 34 37 41 46 50 51 55 59 60 69 79 84 87 92 95 96 100 101 102 103 107 110

POLYPEPTIDES, 16POLYSACCHARIDES, 16POLYVINYL ACETATE

EMULSION (PVAC-E), 57POLYVINYL ALCOHOL

BINDING TAPE, 89POLYVINYL ALCOHOL FILMS,

34POLYVINYL ALCOHOL

HYDROGEL, 43POSITRON ANNIHILATION, 30POSITRON ANNIHILATION

LIFETIME SPECTROSCOPY (PALS), 39 77

POTENTIOSTATIC METHOD, 61PRECURSORS, 25PVA COPOLYMER CAPSULES,

88PVA CRYOGELS, 72PVAL FILM PROPERTIES, 9PVAL PROPERTIES, 11PVAL/GELATIN BLENDS, 18PVAL-STARCH BLENDS, 17 18PYROLYSIS, 22 26PYROLYSIS-GAS

CHROMATOGRAPHY/MASS SPECTROMETRIC ANALYSIS (PY-GC/MS), 49

PYRROLE, 82

RRADIATION METHOD, 116RADICAL

COPOLYMERISATION, 83RADICAL POLYMERISATION,

27 42RAFT POLYMERISATION, 42RAMAN SPECTROSCOPY, 79 84REDOX INITIATOR, 81REFERENCES, 23REPRESENTATIVE LIFE CYCLE

ANALYSIS (LCA), 15RESPONSE SURFACE

METHODOLOGY (RSM), 68REVERSIBLE ADDITION-

FRAGMENTATION CHAIN TRANSFER (RAFT) POLYMERISATION, 37

RHEOLOGY, 59

RITEFLEX COPOLYESTER THERMOPLASTIC ELASTOMER, 83

ROSE BENGAL (RB) DYE, 112

SSAPONIFICATION, 41 46 72 90

118 119SCANNING CALORIMETRY

X-RAY DIFFRACTION, 31SCANNING ELECTRON

MICORSCOPY, 29 33 37 45 51 52 54 55 60 62 63 68 75 76 78 79 82 83 91 114 116

SCANNING PROBE MICROSCOPY, 67

SCANNING TRANSMISSION ELECTRON MICROSCOPY, 29

SEED SWELLING, 110SEEDED EMULSION

POLYMERISATIONS, 87SEMI INTERPENETRATING

NETWORKS (S-IPN), 113 114SINGLE WALL CARBON

NANOTUBES (SWNT), 79SINGLE-BEAM Z-SCAN

TECHNIQUE, 109SINGLE-SCREW EXTRUDER,

41 74SIZE EXCLUSION

CHROMATOGRAPHY, 82 103 116

SMALL-ANGLE X-RAY SCATTERING (SAXS), 71 84

SOL-GEL PROCESS, 89 108SOLID-STATE

POLYMERIZATION METHOD, 71

SOLUTION COPOLYMERISATION, 90

SOLUTION PROCESSING, 10SOLVENT CASTING METHOD,

66SORPTION, 93SOY PROTEIN ISOLATE (SPI),

48SPECTROPHOTOMETRIC

ANALYSIS, 116STANELCO, 90STERILISATION, 70SULPHONATED POLYHEDRAL

OLIGOSILSESQUIOXANE (SPOSS), 45

SURFACE MODIFICATION, 114SUSPENSION

POLYMERISATION, 110

Subject Index

SWELLING, 60 61 62 64 72 76 77 81 82 84 85 86 89 92 94 96 97 101 103 104 106 111 113

SWELLING RATIO (SR), 45SWINE MANURE, 76SYNDIOTACTICITY, 90SYNTHETIC BIOPOLYMERS, 16SYNTHETIC POLYMERS, 23

TTEM, 55TENSILE STRESS-STRAIN

MEASUREMENTS, 71THERMAL ESTERIFICATION, 28THERMAL GRAVIMETRY

DIFFERENTIAL SCANNING CALORIMETRY, 82

THERMAL LENSING, 109THERMAL MOULDING, 89THERMALLY STIMULATED

DEPOLARISATION CURRENTS (TSDCS), 46 66

THERMOFORMING, 11THERMOGRAVIMETRIC

ANALYSIS (TGA), 31 37 45 52 63 68 114

THERMOPLASTIC STARCH (TPS), 17

THIOPHENE SIDE-GROUPS, 82TIMBER ENGINEERING, 106TISSUE ENGINEERING, 38 58

118TOMITA K, 26TOOL-NARAYANASWAMY-

MOYNIHAN (TNM), 32TRANSESTERIFICATION, 52TRANSMISSION ELECTRON

MICROSCOPY (TEM IMAGES), 36 40 52 53 94

TWIN-SCREW EXTRUDER, 74TWO-STEP COMPOUNDING

EXTRUSION PROCESS, 105TWO-STEP SYNTHESIS, 27

UULTRA VIOLET SPECTRAL

ANALYSIS, 104ULTRASONIC ENERGY, 81ULTRATHIN POLYMERS, 48UNSATURATED POLYESTER

(UP) RESINS, 80UTRAFINE HYDROGEL

FIBRES, 82UV RADIATION, 30UV-VISIBLE SPECTROSCOPY,

25 78

VVAN DER WAALS BONDING

FORCES, 48VAPOUR PRESSURE

OSMOMETRY, 103VASCULAR EMBOLISATION, 56VASCULAR GRAFTS, 25VINYLON SPUN FIBRE, 4VISCOSITY, 25

WWATER-SOLUBLE POLYMERS,

8WET ADHESION, 92WET SPINNING, 85 106WET-CHEMICAL METHOD, 95WHEAT GLUTEN, 36WIDE ANGLE X-RAY

DIFFRACTION (WAXD), 39 50 91 96 116

XXANTHATE INTERCHANGE

REVERSIBLE ADDITION FRAGMENTATION POLYMERISATION, 77

XPS, 55 73X-RAY DIFFRACTION (XRD), 25

29 46 47 58 60 63 66 78 91X-RAY PHOTOELECTRON

SPECTROSCOPIES, 33 39 53 54 72 75 79

YYOUNG’S MODULUS, 27

ZZONE DRAWING METHOD, 90ZOSTERA FLAKES, 56Z-SCAN TECHNIQUE, 80

Company Index

AAIST, 61AMERICAN SOCIETY FOR

TESTING AND MATERIALS (ASTM),19

AMIRKABIR UNIVERSITY, 61 99AMIRKABIR UNIVERSITY OF

TECHNOLOGY, 41AMIR KABIR UNIVERSITY OF

TECHNOLOGY, 34ANANTAPUR S.K.UNIVERSITY,

62 86ANKARA MIDDLE EAST

TECHNICAL UNIVERSITY, 82ASACHI G.TECHNICAL

UNIVERSITY, 105ATHENS DEMOCRITOS

NATIONAL RESEARCH CENTER, 86

ATHENS NATIONAL TECHNICAL UNIVERSITY, 47

BBARCELONA UNIVERSITY, 117BARODA MS UNIVERSITY, 96BASF AG, 52BASILICATA UNIVERSITY, 109BASQUE COUNTRY

UNIVERSITY, 27BAYREUTH UNIVERSITY, 82BEIJING CHINESE ACADEMY

OF SCIENCES, 39BEIJING UNIVERSITY OF

CHEMICAL TECHNOLOGY, 38

BEIJING UNIVERSITY OF SCIENCE & TECHNOLOGY, 39

BELARUS ACADEMY OF SCIENCES, 98

BELFAST QUEEN'S UNIVERSITY, 53

BELGRADE INSTITUTE OF NUCLEAR SCIENCES, 49

BHABHA ATOMIC RESEARCH CENTRE, 30

BOMBAY TEXTILE RESEARCH ASSN., 78 89

BORDEAUX 1 UNIVERSITE, 46BRASOV TRANSILVANIA

UNIVERSITY, 57

BRAZILINSTITUTO DE PESQUISAS ENERGETICAS E NUCLEARES, 63

BRIDGESTONE AMERICAS, 36BRNO UNIVERSITY OF

TECHNOLOGY, 47BRUSSELS VRIJE

UNIVERSITEIT, 34 45BUCHAREST CHEMICAL

RESEARCH INSTITUTE, 51BUCHAREST POLYTECHNICAL

UNIVERSITY, 51BUENOS AIRES UNIVERSITY, 28BULGARIAN ACADEMY OF

SCIENCES, 95B.V. CHINA, 38

CCAIRO AIN SHAMS

UNIVERSITY, 90CAIRO NATIONAL CENTER

FOR RADIATION RES. & TECHNOL., 113

CAIRO UNIVERSITY, 42 90CALIFORNIA UNIVERSITY, 117CALIFORNIA UNIVERSITY AT

DAVIS, 56 82CANBERRA AUSTRALIAN

NATIONAL UNIVERSITY, 108CARBON

NANOTECHNOLOGIES INC., 79

CARNEGIE-MELLON UNIVERSITY, 26 43

CASE WESTERN RESERVE UNIVERSITY, 35 36 46

CEA-SACLAY, 78CELANESE EMULSIONS

NORDEN AB, 92CENTRAL ELECTROCHEMICAL

RESEARCH INSTITUTE, 33CENTRAL INSTITUTE OF

PLASTICS ENGINEERING & TECHNOLOGY, 74

CHANGCHUN NORTHEAST NORMAL UNIVERSITY, 100

CHICHESTER JOHN WILEY & SONS INC., 117

CHINA NORTHEAST NORMAL UNIVERSITY, 55

CHINA UNIVERSITY OF SCIENCE & TECHNOLOGY, 81

CHINA WEST NORMAL UNIVERSITY, 53

CHINESE ACADEMY OF SCIENCES, 69 85

CHINESE ACADEMY OF TROPICAL AGRICULTURAL SCIENCES, 49

CHONBUK NATIONAL UNIVERSITY, 75 84 100 112 113

CHONNAM NATIONAL UNIVERSITY, 81 90

CHULALONGKORN UNIVERSITY, 104

CHUNG-HUA UNIVERSITY, 76CHUNGNAM NATIONAL

UNIVERSITY, 91CHUNG YUAN CHRISTIAN

UNIVERSITY, 103CHUN-XIA ZHAO, 45CLARKSON UNIVERSITY, 42CLEVELAND LOUIS STOKES

DVA MEDICAL CENTER, 35COIMBRA UNIVERSITY, 57 89 96COLORADO STATE

UNIVERSITY, 93COMMONWEALTH SCIENTIFIC

& INDUSTRIAL RESEARCH ORGANISATION, 69

CONNECTICUT UNIVERSITY, 36CSIC, 59 117CSIRO MANUFACTURING

AND INFRASTRUCTURE TECHNOLOGY, 88

CUZA AL.I. UNIVERSITY, 29CUZA AL.I.UNIVERSITY, 105

DDAIDO CHEMICAL CORP., 88DALIAN PLASTICS RESEARCH

INSTITUTE CO.LTD., 46DE-LONG WANG, 45DE-YI WANG, 45

DONGHUA UNIVERSITY, 72

Company Index

EECOLE SUPERIEURE DE

PHYSIQUE AND CHIMIE INDUSTRIELLES DE LA VILLE DE PARIS, 47

EGYPTIAN PETROLEUM RESEARCH INSTITUTE, 97

EGYPT NATIONAL CENTRE FOR RADIATION RES.& TECHNOL., 64 100 116

EGYPT NATIONAL RESEARCH CENTRE, 69

EINDHOVEN UNIVERSITY OF TECHNOLOGY, 62

ELSEVIER LTD, 31 50 68ELSEVIER LTD., 55ENVIRONMENTAL POLYMERS

GROPUP PLC., 112ETH ZURICH, 70EUROPEAN COMMUNITY, 30

33 34 37 38 40 42 43 45 46 47 51 52 53 54 57 58 59 60 62 68 70 72 73 75 77 78 79 80 82 83 86 89 90 92 94 97 98 100 103 104 105 106 107 109 112 113 114 117

EUROPEAN ECONOMIC COMMUNITY, 34 42 45

EUROPEAN UNION, 12 30 33 34 37 38 40 42 43 45 46 47 51 52 53 54 57 58 59 60 62 68 70 72 73 75 77 78 79 80 82 83 86 89 90 92 94 97 98 100 103 104 105 106 107 109 112 113 114 117

EUROPEAN UNION LANDFILL DIRECTIVE, 23

EUROPEAN UNION LEGISLATION, 20 23

FFEDERATION DES

POLYMERISTES LYONNAIS, 52

FIAT RESEARCH CENTER, 43FLYNN BURNER CORP., 48FOREST RESEARCH INSTITUTE

OF MALAYSIA, 69FRANCHE-COMTE

UNIVERSITE, 94FRAUNHOFER INSTITUTE

FOR APPLIED POLYMER RESEARCH, 104

FUJIAN NORMAL UNIVERSITY, 27

FUZHOU UNIVERSITY, 44

GGEORGETOWN UNIVERSITY, 39GEORGIA INSTITUTE OF

TECHNOLOGY, 37 79GRANADA UNIVERSITY, 70GRENOBLE INSTITUT

NATIONAL POLYTECHNIQUE, 30

GUANGXI UNIVERSITY, 32GUILIN UNIVERSITY OF

TECHNOLOGY, 73GUNG UNIVERSITY, 31GYEONGSANG NATIONAL

UNIVERSITY, 77

HHACETTEPEUNIVERSITY, 53HANGYANG UNIVERSITY, 87HANNAM UNIVERSITY, 77 88HANYANG UNIVERSITY, 46 51

62 77 85 88 94 103 106 112 113HEBEI UNIVERSITY, 102 107HEFEI UNIVERSITY OF

TECHNOLOGY, 58HEILONGJIANG UNIVERSITY,

55HELSINKI UNIVERSITY OF

TECHNOLOGY, 53HEXI UNIVERSITY, 52HONG KONG POLYTECHNIC

UNIVERSITY, 38HUAQIAO UNIVERSITY, 27HYDERABAD CENTRE

FOR CELLULAR AND MOLECULAR BIOLOGY, 81

HYDERABAD UNIVERSITY, 81

IIDAHO NATIONAL

LABORATORY, 28INDIA CENTRAL FOOD

TECHNOLOGICAL RESEARCH INST., 76

INDIA CENTRAL SALT & MARINE CHEM.RES.INST., 87

INDIAN INSTITUTE OF CHEMICAL TECHNOLOGY, 44 64

INDIAN INSTITUTE OF SCIENCE, 33 86

INDIAN INSTITUTE OF TECHNOLOGY, 33 67 80

INDIAN PETROCHEMICAL CORP.LTD., 96

INHA UNIVERSITY, 30 51 62INNOVATION GROUP, 55INSTITUTO DI RICERCA E

TECNOLOGIA DELLE MATERIE PLASTICHE, 109

INTERCHEM HELLAS SA, 92IOWA STATE UNIVERSITY, 105IRANIAN RESEARCH

ORGANIZATION OF SCIENCE & TECHNOLOGY, 69

IRAN POLYMER & PETROCHEMICAL INSTITUTE, 41

ISFAHAN UNIVERSITY OF MEDICAL SCIENCES, 111

ISTANBUL TECHNICAL UNIVERSITY, 63 82

ITAJUBA UNIVERSIDADE FEDERAL, 63

ITALY NATIONAL RESEARCH COUNCIL, 109

IVERSITY, 58

JJABALPUR GOVERNMENT

AUTONOMOUS SCIENCE COLLEGE, 78

JAPAN ADVANCED INSTITUTE OF SCIENCE & TECHNOLOGY, 44

JAPAN ATOMIC ENERGY AGENCY, 40

JAPANESE STANDARDS ASSOCIATION, 98

JAPAN NATIONAL INSTITUTES OF NATURAL SCIENCES, 29

JASSY, 105JASSY CUZA AL.I.

UNIVERSITY, 34JILIN UNIVERSITY, 72JIMEI MIDDLE SCHOOL, 55

KKANSAS STATE UNIVERSITY,

99KARNATAK UNIVERSITY, 115KASHAN UNIVERSITY, 61KATCO, 112KERALA UNIVERSITY, 80KERMANSHAH UNIVERSITY

OF MEDICAL SCIENCES, 98KHARAGPUR INDIAN

INSTITUTE OF TECHNOLOGY, 76

Company Index

KIEV INSTITUTE OF PHYSICAL CHEMISTRY, 78

KOLON INDUSTRIES INC., 81KOREA ATOMIC ENERGY

RESEARCH INSTITUTE, 92 96KOREA INSTITUTE OF

CERAMIC ENGINEERING & TECHNOLOGY, 96

KOREA INSTITUTE OF FOOTWEAR & LEATHER TECHNOLOGY, 54

KOREA ORTHOPEDICS & REHABILITATION ENGINEERING CENTER, 113

KURARAY CO.LTD, 49 70 116KUVEMPU UNIVERSITY, 32KYOTO INSTITUTE OF

TECHNOLOGY, 41KYOTOINSTITUTE OF

TECHNOLOGY, 71KYOTO UNIVERSITY, 40 49 65

70 85 98 116KYUNG HEE UNIVERSITY, 91KYUNGIL UNIVERSITY, 60KYUNGPOOK NATIONAL

UNIVERSITY, 62 87 90

LLANZHOU NORTHWEST

NORMAL UNIVERSITY, 73LANZHOU UNIVERSITY, 52LARISSA TECHNOLOGICAL

EDUCATIONAL INSTITUTE, 58

LAUSANNE ECOLE POLYTECHNIQUE FEDERALE, 44

LEHIGH UNIVERSITY, 87 118LG CHEM, 77LIEGE UNIVERSITY, 42 73LJUBLJANA UNIVERSITY, 89LOMONOSOV M.V.ACADEMY

OF FINE CHEMICAL TECHNOLOGY, 74 91

LONDON IMPERIAL COLLEGE OF SCIENCE TECHNOLOGY & MEDICINE, 37

LONDON UNIVERSITY KING'S COLLEGE, 73

LOWELL MASSACHUSETTS UNIVERSITY, 29

LUBBOCK TEXAS TECH UNIVERSITY, 47

LUBLIN MARIA CURIE-SKLODOWSKA UNIVERSITY, 47

MMACPLAS INTERNATIONAL, 89MADISON UNIVERSITY OF

WISCONSIN, 61MADRID INSTITUTO DE

CIENCIA Y TEC.DE POLIM, 77MADRID INSTITUTO DE

CIENCIA Y TEC.DE POLIM., 79

MANCHESTER UNIVERSITY, 37MANGALORE UNIVERSITY,

30 66MANSOURA UNIVERSITY, 104MAPEI SPA, 80MARBURG PHILIPPS

UNIVERSITAT, 105MARBURG PHILIPPS

UNIVERSITY, 83MARINGA UNIVERSIDADE

ESTADUAL, 28 68MARYLAND UNIVERSITY, 37MASSACHUSETTS GENERAL

HOSPITAL, 39MASSACHUSETTS LAHEY

CLINIC MEDICAL CENTER, 29

MERSIN UNIVERSITY, 89MICHOACANA UNIVERSIDAD,

57MIE UNIVERSITY, 83MILANO POLITECNICO, 80MINAS GERAISFUNDACAO

EZEQUIEL DIAS, 63MINAS GERAIS

UNIVERSIDADE FEDERAL, 39 84

MINAS GERAISUNIVERSIDADE FEDERAL, 63

MINGCHI UNIVERSITY OF TECHNOLOGY, 61

MINNESOTA UNIVERSITY, 107MOKPO NATIONAL

UNIVERSITY, 96MONTERREY INSTITUTO

TECNOLOGICO Y DE ESTUDIOS SUPERIORES, 57

MONTREAL ECOLE POLYTECHNIQUE, 84

MONTREAL UNIVERSITY, 25 84MOSCOW INSTITUTE OF

CHEMICAL PHYSICS, 96MOUNT HOLYOKE COLLEGE,

53MULHOUSE ECOLE

NATIONALE SUPERIEURE DE CHIMIE, 92

MUMBAI UNIVERSITY, 93

MUMBAI UNIVERSITY INSTITUTE OF CHEMICAL TECHNOLOGY, 64

MUMBAI WATUMULL INSTITUTE OF TECHNOLOGY, 64

MYSORE UNIVERSITY, 32

NNAGOYA UNIVERSITY, 26 91NANJING UNIVERSITY, 25NAPAAM TEZPUR

UNIVERSITY, 89NAPLES INSTITUTE

OF COMPOSITE & BIOMEDICAL MATERIALS, 43

NAPOLI UNIVERSITA FEDERICO II, 43

NARA INSTITUTE OF SCIENCE & TECHNOLOGY, 91

NARA WOMEN'S UNIVERSITY, 58 70 118

NEW BRUNSWICK UNIVERSITY, 36

NEW SOUTH WALES UNIVERSITY, 70 77

NISSHIN KASEI CO.LTD., 88NITTO DENKO CORP., 41 71NORTH CAROLINA STATE

UNIVERSITY, 44 82 101NORTH CHINA INSTITUTE OF

TECHNOLOGY POLYMER, 71NORTHERN IRELAND

DEPARTMENT OF AGRICULTURE, 53

NRCS DEMOKRITOS, 57

OOKAYAMA UNIVERSITY, 97OSAKA INSTITUTE OF

TECHNOLOGY, 46OSAKA UNIVERSITY, 116

PPAIS VASCO UNIVERSIDAD, 40PALAISEAU ECOLE

POLYTECHNIQUE, 42PARDUBICE UNIVERSITY, 32PARIS VII UNIVERSITE, 25PARIS XIII UNIVERSITE, 25PAULISTA UNIVERSIDADE

ESTADUAL, 68

Company Index

PENNSYLVANIA STATE UNIVERSITY, 26

PENNSYLVANIA UNIVERSITY, 35

PENTAFIN ASSOCIATES, 117PERNAMBUCO

UNIVERSIDADE FEDERAL, 94

PETRO CHINA CO.LTD., 72PHARMACEUTICAL

TECHNOLOGY, 26PHARMACEUTICAL

TECHNOLOGY EUROPE, 88PISA UNIVERSITY, 59 68 97 109PRECISION CUSTOM COATING,

83PREFECTURE UNIVERSITY, 51PRETORIA UNIVERSITY, 31PUNE NATIONAL CHEMICAL

LABORATORY, 85PUSAN NATIONAL

UNIVERSITY, 38 54 59PUTRA MALAYSIA

UNIVERSITI, 69PVAXX RESEARCH &

DEVELOPMENT LTD, 12

QQINGDAO OCEAN

UNIVERSITY, 28 43QINGDAO UNIVERSITY, 28QUEBEC UNIVERSITE A

TROIS-RIVIERES, 94

RRANDOX LABORATORIES

LTD., 78RANI DURGAVATI

UNIVERSITY, 66RAZI UNIVERSITY, 98RHODIA TECHNICAL AND

RESEARCH CENTRE, 42RIO DE JANEIRO CIDADE

UNIVERSITARIA, 56RIO DE JANEIRO

UNIVERSIDADE FEDERAL, 39 56

RIO GRANDE DO SUL UNIVERSIDADE FEDERAL, 45

ROUEN UNIVERSITY, 114RUSSIAN ACADEMY OF

SCIENCES, 74 91

SSALERNO UNIVERSITY, 75SANTA CATARINA FEDERAL

UNIVERSITY, 41SAO CARLOS UNIVERSIDADE

FEDERAL, 39 108SAO PAULO UNIVERSITY, 63SAO PAULOUNIVERSITY, 110SCANDINAVIA, 43SCHULMAN A. INC., 83SCIENCE MUSEUM, 12SEOUL NATIONAL

UNIVERSITY, 35 91 92 93 94SHANGHAI DONGHUA

UNIVERSITY, 33 38 101 113SHANGHAI INSTITUTE OF

CERAMICS, 89SHANGHAI JIAO TONG

UNIVERSITY, 27SHANXI UNIVERSITY, 37SHIGA PREFECTURE

UNIVERSITY, 29 50 102SHIGA PREFECTURE

UNIVERSITY, 31SHINSHU UNIVERSITY, 91 101

106 110SHIONOGI AND CO.LTD., 26SHIRATORI

NANOTECHNOLOGY CO.LTD., 91

SICHUAN UNIVERSITY, 33 39 45 71

SICHUAN VINYLON WORKS, 85

SINGAPORE NATIONAL UNIVERSITY, 74 80

SINOPEC, 85SOFIA INSTITUTE OF

POLYMERS, 47SOLVAY RESEARCH &

TECHNOLOGY, 42 73SOOCHOW UNIVERSITY, 110SOUTH AUSTRALIA

UNIVERSITY, 49SOUTH CHINA UNIVERSITY OF

TECHNOLOGY, 25 36 41 76SOUTH PACIFIC UNIVERSITY,

53SREE CHITRA TIRUNAL

INST.FOR MED.SCI.& TECHNOLOGY, 116

SRI CONSULTING, 49SRI VENKATESWARA

UNIVERSITY, 44 47 64 86STANELCO PRODUCTS LTD.,

ST.ETIENNE UNIVERSITE JEAN MONNET, 52

SUEZ CANAL UNIVERSITY, 40 90 95

SUNGSHIN WOMEN'S UNIVERSITY, 88

SUN YAT-SEN UNIVERSITY, 63 74

SWINBURNE UNIVERSITY OF TECHNOLOGY, 92

SZCZECIN UNIVERSITY OF TECHNOLOGY, 51

TTAIPEI MING CHI UNIVERSITY

OF TECHNOLOGY, 31TAIWAN FENG CHIA

UNIVERSITY, 37 69TAIWAN NATIONAL CHENG

KUNG UNIVERSITY, 50TAIWAN NATIONAL CHIAO

TUNG UNIVERSITY, 25 114TAIWAN NATIONAL CHUNG-

HSING UNIVERSITY, 44 76TARBIAT MODARRES

UNIVERSITY, 26 98 101TARRAGONA UNIVERSITAT

ROVIRA I VIRGILI, 103TATUNG UNIVERSITY, 107TECHNOLOGY, SZCZECIN

UNIVERSITY OF, 51TEHRAN AMIR KABIR

UNIVERSITY, 58 112TEHRAN UNIVERSITY, 30 71TEHRAN UNIVERSITY OF

MEDICAL SCIENCE, 99TEXAS TECHNICAL

UNIVERSITY, 48TEXASUNIVERSITY, 53THESSALONIKI ARISTOTLE

UNIVERSITY, 58TIANJIN HOSPITAL, 65TIANJIN INSTITUTE OF

MEDICAL EQUIPMENT, 66TIANJIN POLYTECHNIC

UNIVERSITY, 31 36 66 73TIANJIN UNIVERSITY, 50 57 61

65 72 75 77 78 110TIANJIN UNIVERSITY OF

COMMERCE, 48TICONA CORP., 83TNO SCIENCE AND INDUSTRY,

62TOHOKU UNIVERSITY, 29TOKO UNIVERSITY, 37TOKYO INSTITUTE OF

TECHNOLOGY, 67

Company Index

TOKYO SCIENCE UNIVERSITY, 116

TOKYO UNIVERSITY, 52TOKYO UNIVERSITY

OF AGRICULTURE & TECHNOLOGY, 85

TONGJI UNIVERSITY, 108TSING HUA UNIVERSITY, 93TURKEY NIGDE UNIVERSITY,

82TWENTE UNIVERSITY, 51

UUBE NATIONAL COLLEGE OF

TECHNOLOGY, 109UKRAINE INSTITUTE OF

PHYSICS, 47 78UKRAINE INSTITUTE OF

SURFACE CHEMISTRY, 47ULSTER UNIVERSITY, 89UNIVERSITY OF

TECHNOLOGY, 65UNIVERSITY OF WARWICK'S,

12UPPSALA UNIVERSITY, 43 72US DEPT. OF AGRICULTURE,

68 97US NAVAL RESEARCH

LABORATORY, 36

WWALES UNIVERSITY, 53WARSAW UNIVERSITY, 51WARWICK MANUFACTURING

GROUP, 12WATERLOO UNIVERSITY, 63WEIZMANN INSTITUTE OF

SCIENCE, 86WESTERN EUROPE-GENERAL,

54WISCONSIN-MADISON

UNIVERSITY, 29 89WUHAN UNIVERSITY, 32 38 78

100WUHAN UNIVERSITY OF

TECHNOLOGY, 32

XXIAMENUNIVERSITY, 114XIAN JIAOTONG UNIVERSITY,

108XIAN NORTHWESTERN

POLYTECHNICAL UNIVERSITY, 117

YYA LIU, 45YAMAGATA UNIVERSITY, 40YAMAGUCHI UNIVERSITY, 109YEUNGNAM UNIVERSITY, 60

62 73 81 83 84 87 90YOKOHAMA KEIO

UNIVERSITY, 91YONSEI UNIVERSITY, 30YUCATAN CENTRO DE

INVESTIGACION Y ESTUDIOS AVANZADOS DEL IPN, 57

YU-RONG MOU, 45YU-ZHONG WANG, 45

ZZAGAZIG UNIVERSITY, 95ZHEJIANG UNIVERSITY, 44 86

94ZHI-CHAO LAI

SHANXIUNIVERSITY, 37

Company Index

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