Abstract Polymers were synthesized by polymerization of 4-vinylbenzyl chloride with three kinds of aromatic monomers, respectively. Quaternization of these polymers with triethylamine were performed to fabricate associated anion exchange membranes (AEMs) possessing different pendants. The obtained AEMs showed excellent stability in alkaline solutions at elevated temperature and exhibited conductivities of 32.6–39.5 mS cm−1 in water at 80 °C. In particular, the AEM having a pendant of p-ethyl phenol could maintain the initial conductivity of 89% after immersed in 1 M KOH at 80 °C for 1000 h. Even soaked in 8 M KOH solution at 80 °C for 24 h, this AEM still exhibited a conductivity of 26.4 mS cm−1 at 80 °C, about 80% of its original conductivity was remained. However, the rest of prepared AEMs showed significant decline in conductivity. We studied the tolerance of the prepared AEMs to 8 M KOH at 80 °C in the presence of p-ethyl phenol with a concentration of 0.025 M. It is found that the stability of all the AEMs was obviously enhanced, about 70–90% of the initial conductivity was retained. This result suggests an effective strategy to improve the alkaline stability of the AEMs.

中文翻译：

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具有不同侧基的苄基-三乙基铵官能化阴离子交换膜的高耐碱性

摘要 4-乙烯基苄基氯分别与三种芳香族单体聚合合成了聚合物。用三乙胺对这些聚合物进行季铵化以制造具有不同悬垂物的相关阴离子交换膜（AEM）。获得的 AEM 在高温碱性溶液中表现出优异的稳定性，并且在 80°C 的水中表现出 32.6-39.5 mS cm-1 的电导率。特别是，在 80 °C 下浸入 1 M KOH 1000 小时后，具有对乙基苯酚侧链的 AEM 可以保持 89% 的初始电导率。即使在 80 °C 的 8 M KOH 溶液中浸泡 24 小时，该 AEM 在 80 °C 下仍表现出 26.4 mS cm-1 的电导率，保持其原始电导率的 80% 左右。然而，其余制备的 AEM 显示出电导率的显着下降。我们研究了在 0.025 M 浓度的对乙基苯酚存在下制备的 AEMs 在 80 °C 下对 8 M KOH 的耐受性。发现所有 AEMs 的稳定性明显增强，约 70-90%保留了最初的电导率。这一结果表明了一种提高 AEM 碱性稳定性的有效策略。