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Study on Various Compositions of Polyvinyl Alcohol and Starch Blends by Cross-Linking with Glyoxal

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DOI: 10.4236/ojpchem.2019.94007    173 Downloads   381 Views

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.

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Gadhave, R. , Mahanwar, P. and Gadekar, P. (2019) Study on Various Compositions of Polyvinyl Alcohol and Starch Blends by Cross-Linking with Glyoxal. Open Journal of Polymer Chemistry, 9, 76-85. doi: 10.4236/ojpchem.2019.94007.

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