ポリビニルアルコ-ル濃厚水溶液の低温結晶化によるゲル生成 (高分子ゲル-2-<特集>)
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概要
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Poly (vinyl alcohol) (PVA) microporous hydrogels with high strength and high water content were prepared by freezing the concentrated aqueous PVA solutions below their freezing points, this was followed by slow crystallization of the frozen polymer above their freezing points. When a 30wt% aqueous solution of PVA with the degree of polymerization of 1750 and the degree of saponification of 99.5mol% was frozen at -20°C for 24h and then slowly thawed at 5°C for 10h, a hydrogel was obtained which exhibited the tensile strength of 60 kg/cm<SUP>2</SUP> and the elongation at break of 500%. The tensile strength and the elongation values became 35kg/cm<SUP>2</SUP> and 400%, respectively, for a PVA gel prepared by thawing the frozen solution at 20°C for 3h. X-Ray and SEM studies revealed that the gels had a semi-crystalline and micro-porous structure.
- 公益社団法人 高分子学会の論文
公益社団法人 高分子学会 | 論文
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