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论文类型：期刊论文

发表时间：2019-03-01

发表刊物：JOURNAL OF MEMBRANE SCIENCE

收录刊物：SCIE、Scopus

卷号：573

页面范围：157-166

ISSN号：0376-7388

关键字：Friedel-Crafts alkylation; Anion exchange membranes; Pendent side chain; Micro-phase separation; Low swelling ratio

摘要：Friedel-Crafts alkylation route is proposed to synthesis polysulfone based anion exchange membrane (AEM) containing pendent imidazolium-functionalized side chain with the purpose of avoiding conventional carcinogenic chloromethylation. It has no special functional group requirements on the polymer materials, which has advantage over those reported chloromethylation free routes. A novel flexible alkylation reagent containing -(CH2)(4)- spacer, (1-chlorobutyl-2,3-dimethylimidazole chloride) is synthesized and promotes hydrophilic/hydrophobic micro-phase separation structure in the membranes proved by small angle X-ray scattering (SAXS) and transmission electron microscopy image (TEM). The imidazolium-functionalized polysulfone AEMs prepared by the Friedel-Crafts alkylation route in this study exhibit first level properties compared to other AEMs prepared without chloromethylation. The ion conductivity-normalized swelling ratio (0.08% cm mS(-1) at 80 degrees C) is the lowest, while exhibits higher or equivalent IEC normalized ion conductivity (56.8 S g cm(-1) mol(-1) at 80 degrees C). The membranes prepared in this work also display good thermal, mechanical and alkaline stabilities.