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Preparation and Characteristics of Partially Fluorinated-Sulfonated Poly(biphenylene-co-sulfone)ether Membranes for Polymer Electrolyte Membrane Fuel Cell  

Park, Jae-Wan (Environment & Resources Research Center, Korea Research Institute of Chemical Technology)
Chang, Bong-Jun (Environment & Resources Research Center, Korea Research Institute of Chemical Technology)
Kim, Jeong-Hoon (Environment & Resources Research Center, Korea Research Institute of Chemical Technology)
Lee, Yong-Taek (Department of Chemical Engineering, Chungnam National University)
Publication Information
Polymer(Korea) / v.34, no.2, 2010 , pp. 137-143 More about this Journal
Abstract
A series of partially fluorinated, sulfonated poly(biphenylene-co-sulfone)ether containing perfluorocyclobutane(PFCB) groups were prepared for fuel cell applications through three synthetic steps: synthesis of trifluorovinylether-terminated monomers, thermal cycloaddition and post-sulfonation. Two kinds of trifluorovinylether-terminated monomers were synthesized and statistically copolymerized via thermal cycloaddition to obtain a series of polymers containing 20-60 mol% of biphenyl units(PBS-X). The post-sulfonation of PBS-X was carried out using chlorosulfonic acid(CSA) to obtain copolymers with various sulfonation levels(SPBS-X). All the synthesized compounds, monomers and polymers were characterized by $^1H$-NMR, $^{19}F$-NMR and FT-IR. It was confirmed that the ion exchange capacity(IEC), water uptake and ion conductivity of SPBS-X increased with the increment of sulfonated biphenyl units. Particularly, SPBS-60 showed higher ion conductivity compared to Nafion$^{(R)}$-115 at 25~80 $^{\circ}C$.
Keywords
sulfonated polymer electrolyte membrane; fluorinated polymer; fuel cell; poly(arylene ether sulfone);
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