一种含烷氧基柔性长支链苯并咪唑功能化聚苯醚阴离子交换膜研究

Study on functionalized polyphenylene ether anion exchange membrane with alkoxylated flexible long branch benzimidazole

本文合成一种含烷氧基柔性长支链苯并咪唑功能化聚苯醚阴离子交换膜,并进行了相应的表征。制得的阴离子交换膜显示出较高的OH-传导能力及优越的化学稳定性。PPO-OH-M4在20℃时电导率为35.4 (m·S)/cm,当温度升高至60℃时,电导率增加到55.7 (m·S)/cm,体现了优越的离子传导率。亲水柔性长支链与疏水主链相互作用,形成了明显的微相分离,构建了连续的离子传输通道。将PPO-OH-M4浸泡于80℃1 mol/L KOH溶液340 h后,电导率仍保持87.5%。长的烷氧基支链聚集,相互盘绕,有效减弱OH-对功能基团的进攻,可为合成高性能阴离子交换膜提供了新的思路。

This article synthesized a functionalized polyphenylene ether anion exchange membrane containing alkoxy flexible long branched benzimidazole and characterized it accordingly.The prepared anion exchange membrane ex-hibits high OH~conductivity and superior chemical stability.The conductivity of PPO-OH-M4 is 35.4(m·S)/cm at 20℃.Whenthetemperaturerisesto 60℃,theconductivity increasesto 55.7(m·S)/cm,demonstrating su-perior ion conductivity.The interaction between hydrophilic flexible long branched chains and hydrophobic main chains forms a clear microphase separation,constructing a continuous ion transport channel.After soaking PPO-OH-M4 in a 1 mol/L KOH solution at 80 C for 340 h,the conductivity remained at 87.5%.The aggregation and coiling of long alkoxy branched chains effectively weaken the attack of OH-on functional groups,providing new i-deas for the synthesis of high-performance anion exchange membranes.