Journal
POLYMERS & POLYMER COMPOSITES
Volume 17, Issue 7, Pages 403-410Publisher
SAGE PUBLICATIONS LTD
DOI: 10.1177/096739110901700702
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Funding
- Council of Scientific Industrial Research, India
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The suitability of oxalic acid as a crosslinker of polyvinyl alcohol (PVA) is the focus of study of the present paper. Oxalic acid concentration was varied from 3-70% (w/w with respect to polymer) and curing was carried out at various temperatures (100-140 degrees C) for a range of time periods (20-120 minutes). The optimum curative dose and curing conditions were evaluated through systematic swelling studies (% swelling, gel content, swelling ratio and molecular weight between the crosslinks) of the oxalic acid-treated PVA films, both in hot and cold water. Thermogravimetric analysis showed higher heat stability of oxalic acid crosslinked PVA film compared with heat-treated and virgin PVA. The shift in glass transition temperature (from that of virgin PVA 86 degrees C) to a higher value for heat-treated and oxalic acid-treated PVA was more prominent for the former than the later. Crosslinking enhanced the Young's modulus and IR spectra indicate the formation of ester carbonyl group in crosslinked PVA.
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