Preparation and characterization of side-chain poly(aryl ether ketone) anion exchange membranes by superacid-catalyzed reaction. (22nd April 2021)

• Record Type: Journal Article
• Authors: Li, Ziqin; Yu, Riming; Liu, Chang; Zheng, Jifu; Guo, Jing; Sherazi, Tauqir A.; Li, Shenghai; Zhang, Suobo
• Is Part Of: Polymer. Volume 222(2021)
• Publication Date: 2021-04-22
• Subjects: Anion exchange membranes -- Polyhrdroxyalkylation -- Fuel cells; Polymers -- Periodicals; Polymerization -- Periodicals; Polymères -- Périodiques; Polymérisation -- Périodiques; 547.7
• DOI: 10.1016/j.polymer.2021.123639
• Languages: English
• ISSNs: 0032-3861

Abstract

Abstract: The poly(aryl ether ketone) with spatial cardo structure is prepared from 4, 4′-bis(phenoxy)benzophenone and 1-(4-bromobutyl)indoline-2, 3-dione through a facile polyhydroxyalkylation reaction catalyzed by superacid. The number average molecular weight of the resultant polymer is achieved as high as 105.6 kg mmol −1 . Three anion exchange membranes were prepared by reacting the polymer with trimethylamine, N-methyl-piperidine, and N, N, N′, N′, N″-pentaethylguanidine, respectively. Among the prepared membranes, N-methyl-piperidine based anion exchange membrane exhibited the highest OH − conductivity of 99.8 mS cm −1 at corresponding IEC of 1.54 meq g −1 . In addition, the prepared membranes also exhibit excellent mechanical properties, in which the tensile strength and elongation at break can reach up to 50 MPa and 35%, respectively. Moreover, the anion exchange membranes exhibited good alkaline stability. When they were treated with 1 M KOH at 60 °C for 600 h, their conductivity decreased by less than 5%. Graphical abstract: Image 1 Highlights: A facile and efficient strategy to prepare side-chain poly(aryl ether ketone) AEMs. The introduction of cardo structure improved the anion conductivity of the AEMs. The membranes showed excellent mechanical property with tensile strength of 50 MPa.