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Preparation and Characterization of Crosslinked Copolymer Membrane Containing Sulfonated Poly(ether sulfone) and p-Phenylene Terephthalamide Segments  

Kim, Jung-Min (Department of Fiber & Polymer Engineering, Hanyang University)
Hwang, Seung-Sik (Department of Advanced Materials and Chemical Engineering, Hanyang University)
Cho, Chang-Gi (Department of Fiber & Polymer Engineering, Hanyang University)
Publication Information
Polymer(Korea) / v.35, no.2, 2011 , pp. 106-112 More about this Journal
Abstract
Aromatic copolyamides were prepared and their applicability to proton exchange membrane was studied. The copolymers contain two segments; thermally stable and mechanically strong poly (p-phenylene terephthalamide) (PPTA), and easily processable and good film-forming polysulfone. For the copolymers, different ratios of amine-terminated sulfonated ether sulfone monomer, terephthaloyl chloride, and p-phenylene diamine were sequentially reacted. The obtained copolymers were mixed with trimethylolpropane triglycidyl ether (TMPTGE), thermally cured, and converted into proton exchange membranes for fuel cell application. The reactions at each step and the molecular characteristics of precursor copolymers were confirmed by $^1H$ NMR, FTIR, and titration. The performance of the membranes was measured in terms of water uptake and proton conductivity. The water uptake, ion exchange capacity (IEC), and proton conductivity of the membranes increased with the increase of sulfonated ether sulfone segment content. Membrane containing 60 mol% sulfonic acid sulfone segment showed 1.88 meq/g IEC value. Water uptake was limited less than 110 wt% and the highest proton conductivity was up to $7.4{\times}10^{-2}$ S/cm ($25^{\circ}C$, RH=100%).
Keywords
sulfonated ether sulfone; p-aramid; crosslinked polymer; proton exchange membrane; fuel cell;
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