ICPA水凝胶的电致溶胀/溶蚀行为研究  

Electroinduced-swelling/erosion behaviors of ioncally crosslinked polyampholyte hydrogel

作　　者：刘卫[1] 夏建军[2] 杨祥良[1] 杨亚江[2] 

机构地区：[1]华中科技大学生命科学与技术学院,湖北武汉430074 [2]华中科技大学化学与化工系,湖北武汉430074

出　　处：《华中科技大学学报（自然科学版）》2008年第5期129-132,共4页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(20474022);国家高技术研究发展计划资助项目(2006AA03Z332)

摘　　要：以2-丙烯酰胺-2-甲基丙磺酸(AMPS)和甲基丙烯酸二乙胺基乙酯(DEAEM)形成的离子复合物,通过自由基共聚反应制备了新型离子交联聚两性电解质(ICPA),并获得ICPA水凝胶.ICPA水凝胶在电场作用下具有溶胀/溶蚀的双重响应行为,该行为受电压、电解质种类和浓度等多种因素影响.扫描电镜表征在溶胀阶段,凝胶网络保持完整,不发生溶蚀;而在溶蚀阶段,凝胶的网络结构解体.实验结果表明:凝胶的溶蚀行为与溶胀行为响应程度呈同一变化趋势,凝胶网络的紧密程度(即交联的密度和强度)是其溶胀/溶蚀行为的主要决定因素.Novel ioncally crosslinked polyampholyte （ICPA） gels were synthesized by aqueous redox copolymerization of acrylamide and an ionic complex between （N, N-diethylamino） ethylmethacrylate （DEAEM） and 2-acrylamide-2-methyl propane sulfonic acid （AMPS）. Swelling/erosion double-respond behavior was caused by ICPA gel under DC electric field. The voltage, types and concentration of electrolyte and some other factors influence the double-respond behavior of ICPA gels remarkably. Scanning electron microscope （SEM） photographs shows that ICPA gels erode in the swollen period, and the network of ICPA gels kept well. But in the erosion period, the gels network disaggregated. The experiment results show that the swelling behavior and the erode behavior of ICPA gels present the same trend. The tightness of gels＇ network （crosslinked density and crosslinked intensity） is the crucial factor for the swelling/erosion double-respond behavior.

关 键 词：聚两性电解质水凝胶 离子交联 电场响应 溶胀 溶蚀 

分 类 号：O631[理学—高分子化学]