Chloromethylation and Quaternization of Poly(aryl ether ketone sulfone)s with Clustered Electron-rich Phenyl Groups for Anion Exchange Membranes  

作　　者：Lei Xiong Yuan-Fang Hu Zi-Gui Zheng Zai-Lai Xie Dong-Yang Chen 

机构地区：[1]College of Materials Science and Engineering,Fuzhou University,Fuzhou 350116,China [2]College of Chemistry,Fuzhou University,Fuzhou 350176,China

出　　处：《Chinese Journal of Polymer Science》2020年第3期278-287,I0007,共11页高分子科学（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (Nos. 51873037 and 51503038)

摘　　要：Ion segregation is critically important for achieving high ion conductivity for anion exchange membranes(AEMs).Herein,a new bisphenol monomer bearing ten electron-rich phenyl groups was designed and polymerized with various amounts of electron-deficient 4,4′-dihydroxydiphenylsulfone and 4,4′-difluorobenzophenone to yield dense and selective reaction sites for chloromethylation and quaternization.As the most challenging step,chloromethylation was optimized by tuning the reaction temperature,reaction time,and reactant ratios.Ion exchange capacity,water uptake,anion conductivity,mechanical stability,and alkaline stability of the resulting AEMs were characterized in detail.It is found that chloromethylation reaction needed to be carried out at low equivalent of chloromethylation agents to avoid undesirable crosslinking.The QA-PAEKS-20 sample with an IEC of 1.19 mmol·g^-1 exhibited a Cl^–conductivity of 11.2 mS·cm^-1 and a water uptake of 30.2%at80°C,which are promising for AEM applications.Ion segregation is critically important for achieving high ion conductivity for anion exchange membranes(AEMs). Herein, a new bisphenol monomer bearing ten electron-rich phenyl groups was designed and polymerized with various amounts of electron-deficient 4,4′-dihydroxydiphenylsulfone and 4,4′-difluorobenzophenone to yield dense and selective reaction sites for chloromethylation and quaternization.As the most challenging step, chloromethylation was optimized by tuning the reaction temperature, reaction time, and reactant ratios. Ion exchange capacity, water uptake, anion conductivity, mechanical stability, and alkaline stability of the resulting AEMs were characterized in detail. It is found that chloromethylation reaction needed to be carried out at low equivalent of chloromethylation agents to avoid undesirable crosslinking. The QA-PAEKS-20 sample with an IEC of 1.19 mmol·g-1 exhibited a Cl– conductivity of 11.2 mS·cm-1 and a water uptake of 30.2% at80 °C, which are promising for AEM applications.

关 键 词：Anion exchange membrane CHLOROMETHYLATION Poly(aryl ether) Ion-segregation Anion conductivity 

分 类 号：TM911.4[电气工程—电力电子与电力传动] TQ317[化学工程—高聚物工业]