Poly(arylene ether sulfone) proton exchange membranes with flexible acid side chains

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DOIResolve DOI: http://doi.org/10.1016/j.memsci.2012.02.045
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TypeArticle
Journal titleJournal of Membrane Science
ISSN0376-7388
Volume405-406
Pages6878; # of pages: 11
SubjectSulfonated poly(arylene ether sulfone); Polymer electrolyte membranes; Proton conductivity; Dimensional stability
AbstractNew monomers containing two or four pendent methoxyphenyl groups were synthesized by bromination of bis(4-fluorophenyl)sulfone, followed by Suzuki coupling with 4-methoxybenzeneboronic acid. Copoly(arylene ether sulfone)s containing methoxypheynl groups (2-MPAES-xx and 4-MPAES-xx) based on the corresponding monomers were prepared by aromatic nucleophilic substitution (SNAr) polycondensation. After demethylation of the methoxy group to the reactive hydroxyl group, the respective side chain-type sulfonated copolymers (2-MPAES-xx and 4-MPAES-xx) were obtained by sulfobutylation. Flexible and tough membranes having good mechanical strength were obtained by solution casting of all copolymers. The sulfonated copolymers with two or four pendent sulfobutoxyphenyl groups had high proton conductivities in the range of 0.108-0.258 S/cm for 2-SPAES-xx and 0.135-0.194 S/cm for 4-SPAES-xx at 80 degrees Celsius, respectively. The methanol permeabilities of these membranes were in the range of 1.59 x 10(-7) - 4.69 x 10(-7) cm(2)/s, which is much lower than Nafion® (15.5 x 10(-7) cm(2)/s). 2-SPAES-xxand 4-SPAES-xx display comparatively better balance between proton conductivity and water swelling than the analogous poly(arylene ether sulfone)s containing pendent sulfophenyl groups. A combination of high proton conductivities, low water uptake, and low methanol permeabilities for some of the obtained copolymers indicated that they have some of the requisite properties for proton exchange membranes in fuel cell applications.
Publication date
LanguageEnglish
AffiliationNRC Institute for Chemical Process and Environmental Technology; National Research Council Canada
Peer reviewedYes
IdentifierS0376738812001615
NRC number53062
NPARC number21268482
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Record identifierf477fc47-775a-47f0-833d-85026b9f0c22
Record created2013-07-26
Record modified2016-05-09
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