化学
氢氧化物
膜
聚合物
位阻效应
高分子化学
苯并咪唑
离子交换
离子键合
无机化学
有机化学
离子
生物化学
作者
Owen D. Thomas,Kristen J. W. Y. Soo,Timothy J. Peckham,Mahesh P. Kulkarni,Steven Holdcroft
摘要
A stable hydroxide-conducting membrane based on benzimidazolium hydroxide and its analogous anion-exchange polymer is reported for the first time. The molecular and polymeric analogues possess unprecedented hydroxide stability in neutral and KOH solutions as the soluble benzimidazolium salt, made possible by steric crowding around the benzimidazolium C2 position, which is usually susceptible to nucleophilic attack by OH(-). The polymers were cast and insolubilized for the purpose of forming membranes by blending with a poly(benzimidazole) followed by hydroxide-activated electrostatic interactions. The resulting membranes possess ionic (OH(-)) conductivities of up to 13.2 mS cm(-1) and represent a new class of anion-exchange polymers and membranes.
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