Study on Various Compositions of Polyvinyl Alcohol and Starch Blends by Cross-Linking with Glyoxal
Open Access
- 1 January 2019
- journal article
- research article
- Published by Scientific Research Publishing, Inc. in Open Journal of Polymer Chemistry
- Vol. 09 (04), 76-85
- https://doi.org/10.4236/ojpchem.2019.94007
Abstract
The aim of this study is to analyze the various compositions of polyvinyl alcohol (PVA) and starch blends. The blends have been cross-linked with glyoxal to enhance its properties. The hydroxyl groups of PVA and starch react with glyoxal via formation of acetal bonds; hence crosslinking could take place. The cross-linking of glyoxal is observed in various analytical methods such as DSC and FTIR. The cross-linked blends showed better thermal and mechanical properties. Viscosity, tensile shear strength, pencil hardness and ultimate stress were evaluated to estimate the changes due to cross-linking. It was observed that the cross-linking is directly proportional to starch, since the starch hydroxyl groups are easily accessible for reacting. The cross-linked blend showed better cohesion between its chains, thereby increasing glass transition temperature. It was reflected in the subsequent increase in tensile strength properties.Keywords
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