哌啶交联型聚亚芳基阴离子交换膜的制备

Preparation of piperidine cross-linked polyarylene anion exchange membrane

通过聚羟烷基化反应和Menshutkin反应合成了一系列哌啶/传统季铵交联的无醚含氟聚联苯哌啶阴离子膜.在交联和氟化共同作用下,QBPBP/TFAP-X及QAPBP/TFAP-30%膜的溶胀率(4.3%和8.3%,80℃)均较低.微相分离最明显的QBPBP/TFAP-45%(1.52 meq/g)在80℃下电导率为124.0 mS/cm.哌啶交联的QBPBP/TFAP-X系列膜耐碱性更出色,其中QBPBP/TFAP-45%在80℃的2 mol/L NaOH溶液中处理1000 h后,电导保留率为94.07%,表明哌啶阳离子的耐碱性优于季铵盐.在521.3 mA/cm^(2)的电流密度下,QBPBP/TFAP-45%膜组装的单电池最大功率密度为266.8 mW/cm^(2).

A series of piperidine or conventional quaternary ammonium cationic crosslinked ether free fluorinated poly(biphenyl piperidinium)AEMs were prepared by polyhydroxyalkylation and Menshutkin reaction.Under the combined effect of crosslinking and fluorination,the QBPBP/TFAP-X and QAPBP/TFAP-30%AEM exhibited low swelling ratios(4.3%~8.3%,80℃).QBPBP/TFAP-45%(1.52 meq/g)with the most obvious microphase separation achieved the highest conductivity of 124.0 mS/cm at80℃.In an alkaline resistance test,series of piperidine crosslinked QBPBP/TFAP-X membranes showed better alkaline stability.Treated in a 2 mol/L NaOH solution at 80℃for 1000 h,QBPBP/TFAP-45%showed conductivity retention of 94.07%,indicating that piperidine cation has better alkaline tolerance than traditional quaternary ammonium.At a current density of 521.3 mA/cm^(2),the single cell assembled by the QBPBP/TFAP-45%membrane achieved a maximum power density of 266.8 mW/cm^(2).