Abstract
The gel melting temperatures of thermally reversible poly(vinyl alcohol) [PVA]—water gels were determined using the six conventional PVA samples, which differ in molecular weight. As previously observed in other thermally reversible gels, a linear relationship between the reciprocal absolute melting temperature (Tmg) and the logarithm of v2x was found for each PVA gel, where v2 is the volume fraction of polymer and x the degree of polymerization. The results were analysed using the theoretical expression given in a previous paper. The analysis leads to the conclusion that the “cross-links” in the PVA gels consist of 7 syndiotactic units irrespective of x. It was also shown that the conclusion is in accordance with the sequence length estimated by Shibatani from the rubber-like elastic properties of PVA—water gels.
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Takahashi, A., Hiramitsu, Ss. The Melting Temperature of a Thermally Reversible Gel. III. Poly(vinyl alcohol)—Water Gels. Polym J 6, 103–107 (1974). https://doi.org/10.1295/polymj.6.103
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DOI: https://doi.org/10.1295/polymj.6.103
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