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Authors Mukherjee, R. ; Banerjee, S. ; Komber, H. ; Voit, B.
Title Carboxylic acid functionalized fluorinated sulfonated poly(arylene ether sufone) copolymers with enhanced oxidative stability
Date 15.07.2016
Number 48141
Abstract Carboxylic acid functionalized TPQSH-COOH-XX copolymers were synthesized to investigate their proton exchange membrane properties. This new series of copolymers was prepared by copolymerization of a –COOH moiety containing diphenol monomer, 2-[bis-(4-hydroxy-phenyl)-methyl]-benzoic acid (TP-COOH), with two dihalide monomers, 4,4´-bis(4´-fluoro-3´-trifluoromethylbenzyl)biphenyl (QBF) and 3,3´-disodiumsulfonyl-4,4´-dichlorodiphenylsulfone (SDCDPS), in different mole ratios. The structure of the copolymers (TPQSH-COOH-XX) and of the homopolymer (TPQ-COOH) was analyzed by spectroscopic techniques. The copolymers TPQSH-COOH-XX with different percentage of –SO3H groups showed in TEM images a clear phase separated morphology with ionic clusters of sizes from 5 to 80 nm. All the –COOH functionalized ionomer membranes showed good mechanical properties with enhanced oxidative stability and high dimensional stability. The membranes exhibited high water uptake and swelling due to high IEC values (1.38–1.96 mequiv/g) and the presence of –COOH groups. The copolymers showed high proton conductivity (55–116 mS/cm at 80 °C and 56–112 mS/cm at 90 °C) under fully hydrated condition.
Publisher Journal of Membrane Science
Wikidata
Citation Journal of Membrane Science 510 (2016) 497-509
DOI https://doi.org/10.1016/j.memsci.2016.03.028
Tags proton exchange membrane carboxylic acid oxidative stability proton conductivity

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