哌啶阳离子功能化侧链型阴离子交换膜的制备  

Preparation of piperidinium-functionalized side-chain-type anion exchange membranes

作　　者：林陈晓[1] 卜俊杰 刘芳华 朱爱梅[1] 张秋根[1] 刘庆林[1] LIN Chenxiao;BU Junjie;LIU Fanghua;ZHU Aimei;ZHANG Qiugen;LIU Qinglin(College of Chemistry and Chemical Engineering,Xiamen University,Xiamen 361005,China)

机构地区：[1]厦门大学化学化工学院,厦门361005

出　　处：《膜科学与技术》2018年第3期1-8,共8页Membrane Science and Technology

基　　金：国家自然科学基金面上项目(21376194;21576226)

摘　　要：燃料电池因其能量转化率高、污染小等特点,成为当前的研究热点.然而,作为关键部件的阴离子交换膜仍然存在离子电导率低、耐碱性能差等缺点,这限制了燃料电池的发展.利用威廉姆森成醚反应在聚醚酮主链接枝哌啶鎓盐,成功制备了侧链型阴离子交换膜.设计的哌啶鎓盐通过长柔性亚甲基与主链相连,使膜内形成有利于高效离子传输的微相分离结构,PEKCQA-1.0膜在80℃的电导率高达72.7mS/cm.此外,哌啶阳离子基团离主链较远,减弱了对主链的吸电子作用;同时,环型结构的哌啶阳离子具有一定的空间位阻,减少了OH^-对阳离子基团的攻击,使膜表现出优异的耐碱性能.PEK-CQA-0.8膜在60℃下1mol/L KOH水溶液中浸泡360h后,离子电导率仅下降了8.8%,有望应用于碱性燃料电池.Fuel cells have become research hotpot due to their high efficiency and low pollution.As one of the core component of fuel cells,anion exchange membranes（AEMs）still face the dilemma of low conductivity and poor alkaline stability.Herein,side-chain-type anion exchange membranes were prepared by grafting piperidinium groups into poly（ether ketone）s backbone via Williamson reaction.The piperidinium groups were designed to connect the poly（ether ketone）s backbone via long alkyl spacers.As a result,all the AEMs demonstrate obvious microphase separated morphology in the membranes and PEK-CQA-1.0 exhibits the maximum conductivity of 72.7 mS/cm at 80 ℃.Furthermore,the electronwithdrawing effect of the cationic groups is weaken since the piperidinium groups are far away from backbone.Meanwhile,piperidinium groups containβ-H with the C—C bond rotationally restricted by the ring geometry which provide good chemical stability in alkaline condition.The conductivity of PEK-CQA-0.8 only decreased by 8.8% after immersing the membrane into a 1 mol/L aqueous KOH solution for360 h.The PEK-CQA-x membranes demonstrate high performance and hold promise for fuel cells.

关 键 词：哌啶鎓盐 侧链型 阴离子交换膜 碱性燃料电池 

分 类 号：O632.7[理学—高分子化学]