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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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星型嵌段共聚物基连通离子相筹质子交换膜及其传导性能*
Keywords: 有机高分子材料,质子交换膜,原子转移自由基聚合方法(atrp),星型嵌段共聚物,倍半硅氧烷,微相结构
Abstract:
？以八官能度倍半硅氧烷(bcp-poss)为引发剂，用两步原子转移自由基聚合(atrp)合成了以聚甲基丙烯酸甲酯-b-聚苯乙烯为臂的星型poss-(pmma-b-ps)8嵌段共聚物。用后磺化方法制备具有相同磺化度的磺化杂化高分子poss-(pmma-b-sps)8，并用以制备了质子交换膜(pem)。分析了在不同水合状态下两种pem的传导率随着湿度的变化规律，发现在同样低水合状态下具有较长sps链段的pem其质子传导率较高;tga分析结果表明，两种pem都具有高温保水性能和高的初始热分解温度;用透射电子显微(tem)和原子力显微镜(afm)分析了不同嵌段比例pem的微相结构，发现具有较长sps链段的pem有利于质子传导的两相连通的微相形貌;用低场核磁共振分析仪测定了自旋-自旋弛豫时间t2和不同共聚物低水合状态下链段分子运动特性，发现具有较长sps链段的pem有较狭长且连通性较好的微相分离形貌，显示出较高的质子自旋扩散系数，在低湿度环境下具有较高的质子传导率。
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