Side-chain effects on the properties of highly branched imidazolium-functionalized copolymer anion exchange membranes

被引：30

作者：

Fang, Mingliang ^{[1
]}

Liu, Dong ^{[1
]}

Neelakandan, Sivasubramaniyan ^{[1
]}

Xu, Muzi ^{[1
]}

Liu, Danqing ^{[1
,2
]}

Wang, Lei ^{[1
,2
]}

机构：

[1] Shenzhen Univ, Coll Mat Sci & Engn, Shenzhen Key Lab Polymer Sci & Technol, Shenzhen 518060, Guangdong, Peoples R China

[2] Shenzhen Univ, Guangdong Res Ctr Interfacial Engn Funct Mat, Shenzhen 518060, Guangdong, Peoples R China

来源：

APPLIED SURFACE SCIENCE | 2019年 / 493卷

基金：

中国国家自然科学基金;

关键词：

Anion exchange membrane; Branched poly(arylene ether sulfone)s; Imidazolium groups; Flexible alkyl side chains; POLY(ARYLENE ETHER SULFONE)S; AROMATIC BENZYLTRIMETHYL AMMONIUM; COMB-SHAPED POLYMERS; ALKALINE STABILITY; HYDROXIDE CONDUCTIVITY; PERFORMANCE; CATIONS; OXIDE);

D O I：

10.1016/j.apsusc.2019.07.059

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A set of highly branched imidazolium-functionalized poly(arylene ether sulfone)s copolymer bearing with flexible alkyl side chains of different lengths are designed and synthesized. The ion exchange capacity (IEC), ionic conductivity, water uptake, thermal stability, mechanical property and alkaline resistance of the anion exchange membranes (AEMs) were evaluated in detail. Atomic force microscopy and small-angle X-ray scattering are used to study morphology which reveals that the branched membrane with an alkyl side chain (6 carbons) achieves the highest conductivity (up to 115.8 mS cm(-1) at 80 degrees C) due to the well-developed hydrophilic/hydrophobic phase separation. In addition, the branched co-polymer AEM with a longer alkyl side chain (12 carbons) exhibit the best robust alkaline stability, it decreases only 27% of ionic conductivity after 550 h in 1 M KOH. Therefore, this study provides a comprehensive insight into the tuneable membrane properties of highly branched copolymers as a change in the length of flexible alkyl side chains.

引用

页码：1306 / 1316

页数：11

共 55 条

[1] Electrochemical synthesis of thin, dense, and conformal anion exchange membranes with quaternary ammonium groups [J].