A pillararene‐based macrocycle with up to 10 flexible chains bearing alkyl bromide head groups is synthesized and investigated for the first time as a multiarm cross‐linker for tertiary‐amine functionalized polyethersulfone. Different from any previously reported cross‐linker, this has a unique pillar‐shaped structure and abundant reactive sites to form multifunctional clusters in the conductive domain. This advantage enables cross‐linking to occur smoothly at the membrane‐casting stage and endows the cross‐linked membranes with improved performance. The cross‐linked anion exchange membranes are found to possess high conductivities and excellent alkaline stability. With a controllable swelling ratio of 19.5%, the maximum conductivity of a membrane can reach 155 mS cm^–1 at 80 °C. Due to its local high‐density cross‐linked structure, a delay in degradation kinetics under alkaline condition can be observed, and the loss of conductivity is <10% after 400 h of alkaline stability test at 80 °C.

中文翻译：

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使用带有多个烷基溴头基团的支柱[5]芳烃作为交联剂制备交联阴离子交换膜

合成并首次研究了一种基于柱碳烯的大环化合物，该环具有多达10个带有烷基溴头基的柔性链，并作为叔胺官能化聚醚砜的多臂交联剂进行了首次研究。与以前报道的任何交联剂不同，它具有独特的柱状结构和丰富的反应位，可在导电域中形成多功能簇。这一优势使交联过程在膜浇铸阶段得以顺利进行，并使交联膜具有更高的性能。发现该交联的阴离子交换膜具有高电导率和优异的碱稳定性。可控制的溶胀率为19.5％，膜的最大电导率可达到155 mS cm ^–1在80°C下。由于其局部的高密度交联结构，可以观察到碱性条件下降解动力学的延迟，并且在80°C的碱性稳定性试验400小时后，电导率的损失<10％。