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Hydroxide-Stable Ionenes

机译:氢氧化物稳定的酮

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In the pursuit of stable, hydroxide ion-exchange ionomers and solid polymer electrolytes for fuel cells and electrolyzers, we present a novel, sterically C2-protected poly(benzimidazole) derivative incorporating a hexamethyl-pterphenylene group. Using a new, scalable, and air-insensitive methylation procedure, N-methylation of the polymer is controlled to yield an unprecedented hydroxide-stable, methanol-soluble, and water-insoluble poly(benzimidazolium) ionene. This original polymer is also soluble in aqueous ethanol, which makes it suitable for use as a processable ionomer for catalyst layers. The water uptake and ionic conductivity is correlated to the degree of methylation. The anionic conductivity reached 9.7 ± 0.6 mS cm-1 for polymers with a 92% degree of methylation. Additionally, the hexamethyl-p-terphenylene unit shows interesting atropisomerism, which may influence their physical properties.
机译:为了追求用于燃料电池和电解槽的稳定的氢氧根离子交换离聚物和固体聚合物电解质,我们提出了一种新型的,具有六甲基-对亚苯基的,经空间C2保护的聚苯并咪唑衍生物。使用一种新的,可扩展的且对空气不敏感的甲基化程序,可以控制聚合物的N-甲基化反应,从而产生前所未有的氢氧化物稳定,可溶于甲醇和不溶于水的聚苯并咪唑紫罗烯。该原始聚合物也可溶于乙醇水溶液,使其适合用作催化剂层的可加工离聚物。吸水率和离子电导率与甲基化程度相关。甲基化度为92%的聚合物的阴离子电导率达到9.7±0.6 mS cm-1。另外,六甲基-对-三亚苯基单元显示出有趣的阻转异构现象,这可能影响它们的物理性质。

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