含羧基交联型质子交换膜的制备及其性能

摘要

Excessive water swelling has been an important problem for proton exchange membranes materials,especially for sulfonated poly aryl ether ketone.In this article,a sulfonated polymer containing ester group was hydrolyzed to yield carboxylic side group on its side chain,then the polymer was blended with polyvinyl alcohol and heat-treated to obtain crosslinked blend membranes.The results showed that Tg of the crosslinked membrane was increased significantly suggesting the presence of crosslinking reaction in the polymers.At 100℃ ,the proton conductivity,water uptake and swelling ratio of the crosslinked membranes are in the ranges of 0.072～0.065 S/cm,51%～89% ,and 19%～30% ,respectively.Both the water uptake and swelling rate of the membrane decreased in a certain degree.This method is promising for the preparation of sulfonated poly arylene ether based proton exchange membrane with improved overall performance.%合成了一种含酯基的磺化聚合物,利用后水解的方法得到了含有羧基侧基的聚合物；将磺化聚合物与聚乙烯醇通过溶液共混,热处理后得到交联型的共混膜材料.研究结果表明,膜材料的玻璃化转变温度(Tg)有明显的上升,证明了交联反应的发生；同时,膜的吸水率和溶胀率有一定的下降,力学性能和热稳定性也有一定的提升.通过共价交联的方法,制备了综合性能优异的磺化聚芳醚质子交换膜材料.在100℃,交联膜的质子传导率为0.072 ～0.065 S/cm,吸水率为51％ ～89％,溶胀率为19％～ 30％.