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首页> 外文期刊>Journal of Applied Polymer Science >Swelling-deswelling kinetics of ionic poly(acrylamide) hydrogels and cryogels
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Swelling-deswelling kinetics of ionic poly(acrylamide) hydrogels and cryogels

机译：离子型聚丙烯酰胺水凝胶和冰凝胶的溶胀-溶胀动力学

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A series of ionic poly(acrylamide) (PAAm) gels was prepared by free-radical crosslinking copolymerization of acrylamide and N,N'-methylenebisacrylamide in aqueous solutions. The gels were prepared both below and above the bulk freezing temperature of the polymerization solvent water, which are called as the cryogels and the hydrogels, respectively. The deswelling behavior of swollen gels in acetone as well as the reswelling behavior of the collapsed gels in water were investigated. It was shown that the cryogels respond against the external stimuli much faster than the hydrogels. The interior morphology of the cryogel networks exhibits a discontinuity and a two-phase structure, compared to the continuous morphology of the hydrogel networks. Introduction of the ionic units in the network chains further increased the response rate of the cryogels. In contrast to these advantages of cryogels, they exhibit lower swelling capacities than the conventional hydrogels. (c) 2005 Wiley Periodicals, Inc.
机译：通过在水溶液中进行丙烯酰胺和N，N'-亚甲基双丙烯酰胺的自由基交联共聚反应，制备了一系列离子型聚丙烯酰胺（PAAm）凝胶。在低于和高于聚合溶剂水的整体冻结温度下制备凝胶，分别称为冻凝胶和水凝胶。研究了溶胀的凝胶在丙酮中的溶胀行为以及塌陷的凝胶在水中的溶胀行为。结果表明，冷冻凝胶对外部刺激的反应比水凝胶快得多。与水凝胶网络的连续形态相比，冷冻凝胶网络的内部形态表现出不连续性和两相结构。在网络链中引入离子单元进一步提高了冷冻凝胶的响应速度。与冷冻凝胶的这些优点相反，它们具有比常规水凝胶更低的溶胀能力。 （c）2005年Wiley Periodicals，Inc.

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