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首页> 外文期刊>Journal of Applied Polymer Science >Physicochemical Characterization of Hydrogels Based on Polyvinyl Alcohol-Vinyl Acetate Blends
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Physicochemical Characterization of Hydrogels Based on Polyvinyl Alcohol-Vinyl Acetate Blends

机译：基于聚乙烯醇-乙酸乙烯酯共混物的水凝胶的理化特性

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摘要

Hydrogels made of polyvinyl alcohol-vinyl acetate and its blends with water soluble polymer were studied in terms of swelling behavior, microstructure, and dynamic mechanical properties. Hydrogels prepared by blending polyvinyl alcoholvinyl acetate with either polyacrylic acid or poly(4-vinyl pyridine) exhibited a strong pH dependency. When poly(vinyl pyrrolidone) was used for blending, an unusual pH dependency was observed. An increase in the equilibrium water content in all systems resulted in an increase in the freezable water as determined by DSC. Critical point drying led to a striated surface on polyacrylic acid-polyvinyl alcohol-vinyl acetate hydrogels, whereas a porous structure was observed on the freeze-dried poly(vinyl pyrrolidone)-polyvinyl alcohol-vinyl acetate gels. Hydrogels with elevated storage modulus were obtained when either polyvinyl alcohol-vinyl acetate alone or polyacrylic acid-polyvinyl alcohol-vinyl acetate blends were thermally treated at high temperatures (i.e., 150 deg C). Low storage modulus was observed for both poly(vinyl pyrrolidone) and poly(4-vinyl pyrridine)-containing hydrogels. Temperature dependency of storage modulus from 20 to 60 deg C was observed only for poly(4-vinyl pyridine)-polyvinyl alcohol-vinyl acetate hydrogels.
机译：从溶胀性能，微观结构和动态力学性能方面研究了聚乙烯醇-乙酸乙烯酯及其与水溶性聚合物的共混物制成的水凝胶。通过将聚乙烯醇乙酸乙烯酯与聚丙烯酸或聚（4-乙烯基吡啶）共混制备的水凝胶表现出很强的pH依赖性。当使用聚乙烯吡咯烷酮进行共混时，观察到不寻常的pH依赖性。通过DSC测定，所有系统中平衡水含量的增加导致可冷冻水的增加。临界点干燥导致在聚丙烯酸-聚乙烯醇-乙酸乙烯酯水凝胶上形成横纹的表面，而在冷冻干燥的聚（乙烯基吡咯烷酮）-聚乙烯醇-乙酸乙烯酯凝胶上观察到多孔结构。当在高温（即150℃）下对聚乙烯醇-乙酸乙烯酯单独或聚丙烯酸-聚乙烯醇-乙酸乙烯酯共混物进行热处理时，可获得具有提高的储能模量的水凝胶。对于含聚乙烯吡咯烷酮和含聚4-乙烯基吡啶的水凝胶均观察到低储能模量。仅对于聚（4-乙烯基吡啶）-聚乙烯醇-乙酸乙烯酯水凝胶观察到储能模量在20至60℃之间的温度依赖性。

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