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Synthesis of Crosslinkable m-Aramid Ionomer Containing Sulfonated Ether Sulfone and Their Characterization for PEMFC Membrane  

Jung, Hyun-Jin (Department of Fiber & Polymer Engineering, Hanyang University)
Kim, Jung-Min (Department of Fiber & Polymer Engineering, Hanyang University)
Cho, Chang-Gi (Department of Fiber & Polymer Engineering, Hanyang University)
Publication Information
Polymer(Korea) / v.34, no.3, 2010 , pp. 202-209 More about this Journal
Abstract
Aromatic copolyamides were prepared and their applicability to proton exchange membrane wasstudied. The copolymer contains thermally stable and mechanically strong poly(m-phenylene isophthalamide) segments, and easily processable and good film forming polysulfone segments. For the copolymer, amineterminated sulfonated ether sulfone monomer, m-phenylene diamine, and isophthaloyl chloride were reacted, and the obtained copolymer was transformed into crosslinkable prepolymer by the reaction with acryloyl chloride. The prepolymer was thermally cured and converted into proton exchange membranes for fuel cell application. Each reaction step and the molecular characteristics of precursor copolymers were monitored and confirmed by $^1H$ NMR, FTIR, and titration. The performance of the membranes was measured in terms of water uptake, proton conductivity, and thermal stability. 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 30 mol% sulfonic acid sulfone segment showed 1.57 meq/g IEC value. Water uptake was limited less than 44 wt% and the highest proton conductivity up to $3.93{\times}10^{-2}S/cm$ ($25^{\circ}C$, RH= 100%) was observed.
Keywords
sulfonated ether sulfone; m-aramid; crosslinkable polymer; proton exchange membrane; fuel cell;
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