Swelling behavior of chemically crosslinked PVA gels in mixed solvents

肿胀 的 溶剂 溶解度 傅里叶变换红外光谱 聚乙烯醇 水解 化学 氢键 高分子化学 丙酮 溶解度参数 聚合物 甲醇 化学工程 水溶液 二甲基亚砜 有机化学 分子 工程类
作者
Shuhei Kudo,Emiko Otsuka,Atsushi Suzuki
出处
期刊:Journal of Polymer Science Part B [Wiley]
卷期号:48 (18): 1978-1986 被引量:55
标识
DOI:10.1002/polb.22076
摘要

Abstract We report the swelling behavior of chemically crosslinked polyvinyl alcohol (PVA) gels with different degrees of hydrolysis in water, several organic solvents, and their mixed solvents. The gels were dried after gelation and were put into their respective solvents. The gel volume in pure water decreased with increasing temperatures, and the total changes increased with decreasing degrees of hydrolysis. The swelling ratio depends on the solvent and its concentration. In the cases of mixed solvents of methanol–water, ethanol–water, and acetone–water, the gels shrank continuously with increasing concentrations of solvents and reached the collapsed state in the pure organic solvent. In the case of dimethyl sulfoxide (DMSO), on the other hand, the gels shrunk, swelled, and finally reached the swollen state in pure DMSO. Results of measurements using Fourier Transform infrared spectroscopy (FTIR) and X‐ray diffraction (XRD) suggested that crosslinks and microcrystallites were formed due to hydrogen bonds during the drying process after gelation. The hydrogen bonds were partly destroyed in a rich solvent, but the residual hydrogen bonds had an essential role in determining the swelling behavior in a poor solvent. The swelling behavior and the possible phase transition of the present system are discussed in terms of the solubility of polymers with different degrees of hydrolysis in given mixed solvents and in terms of the formation and destruction of physical crosslinks in the chemical PVA gels. © 2010 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 48: 1978–1986, 2010
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