Alkaline stable anion exchange membranes based on poly(phenylene-co-arylene ether ketone) backbones. Issue 38 (12th September 2016)

• Record Type: Journal Article
• Authors: Qiu, Xiang; Ueda, Mitsuru; Fang, Yi; Chen, Shouwen; Hu, Zhaoxia; Zhang, Xuan; Wang, Lianjun
• Is Part Of: Polymer chemistry. Volume 7:Issue 38(2016)
• Page Start: 5988
• Page End: 5995
• Publication Date: 2016-09-12
• Subjects: Polymers -- Periodicals; Macromolecules -- Periodicals; Polymerization -- Periodicals; 547.705
• DOI: 10.1039/c6py01080f
• Languages: English
• ISSNs: 1759-9954

Abstract

Abstract : To improve the alkaline stability of anion exchange membranes (AEMs) based on conventional poly(ether ketone/sulfone) backbones, two novel poly(phenylene- co -arylene ether ketone) (PPAEK) ionomers with a quaternary ammonium (QA-) or imidazolium (IM-) group were prepared. Abstract : To improve the alkaline stability of anion exchange membranes (AEMs) based on conventional poly(ether ketone/sulfone) backbones, two novel poly(phenylene- co -arylene ether ketone) (PPAEK) ionomers with a quaternary ammonium (QA-) or imidazolium (IM-) group were prepared by zero-valent nickel-catalyzed coupling polymerization, benzylic bromination and in situ amination, successively. In particular, the cationic head-groups were incorporated as pendants into the polyphenylene moieties. Due to its higher water uptake and well-developed microphase separations, IM-PPAEK exhibited a better ion conduction ability than QA-PPAEK over the entire temperature range. However, QA-PPAEK displayed significantly higher alkaline stability in a 1 M NaOH aqueous solution at 80 °C, i.e., over 80% of its initial ion conductivity was still maintained after 1000 h of testing. The present work provides a promising new synthetic approach to obtain high performance AEMs based on chemically stable polyphenylene units.