Synthesis of electro-responsive hydrogels by radiation polymerization of sodium acrylate

International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry Pub Date : 1992-08-01 DOI:10.1016/1359-0197(92)90074-P

Isao Kaetsu , Kumao Uchida , Yasuji Morita , Masayoshi Okubo

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引用次数: 23

Abstract

Sodium acrylate-crosslinker (polyethyleneglycol dimethacrylate or diethyleneglycol dimethacrylate) copolymers were synthesized by photopolymerization and γ-ray-induced polymerization. The copolymer gels had large hydrophilicity. The electrically-responsive changes in weight were studied by sandwiching them between the two electrodes and applying repeatedly the electric field. Both the copolymer gels showed the reversible weight change in response to the on-off switching of the electric field. The response of the copolymer gel with polyethyleneglycol dimethacrylate is sharper than that of the copolymer with diethyleneglycol dimethacrylate. Release of methylene blue a model drug from the copolymer gels was found to occur intermittently in response to the on-off switching. The intermittent release was attributed to the squeezing effect due to the shrinkage of polyelectrolyte gels caused by electrophoretic movement of polymeric anions.

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丙烯酸钠辐射聚合法制备电反应性水凝胶

采用光聚合和γ射线诱导聚合法制备了丙烯酸钠-交联剂(聚乙二醇二甲基丙烯酸酯或二乙二醇二甲基丙烯酸酯)共聚物。共聚物凝胶具有较大的亲水性。通过将它们夹在两个电极之间并反复施加电场，研究了重量的电响应变化。两种共聚物凝胶在电场的开关作用下均表现出可逆的质量变化。与聚乙二醇二甲基丙烯酸酯共聚物凝胶的反应比与二乙二醇二甲基丙烯酸酯共聚物的反应更明显。亚甲基蓝是一种模型药物，从共聚物凝胶中释放出来，被发现间歇性地发生在对开关的反应中。间歇性释放是由于聚合阴离子的电泳运动引起聚电解质凝胶收缩而产生的挤压效应。

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International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry

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