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Preparation and Characterization of Partially Fluorinated Poly (arylene ether sulfone)/PTFE Composite Membranes for Fuel Cell  

Kim, Eun Hee (Green Chemistry and Environmental Biotechnology, University of Science and Technology)
Chang, Bong-Jun (Resources Separation & Recovery Research Group (RGRRG), Korea Research Institute of Chemical Technology)
Kim, Jeong-Hoon (Green Chemistry and Environmental Biotechnology, University of Science and Technology)
Publication Information
Membrane Journal / v.22, no.3, 2012 , pp. 191-200 More about this Journal
Abstract
New composite membranes were manufactured by impregnating post-sulfonated poly(arylene ether sulfone)s containing perfluorocyclobutane (PFCB) groups into porous polytetrafluoroethylene (PTFE) films. Two kinds of post-sulfonated poly(arylene ether sulfone)s with two different monomer ratios (sulfonable biphenylene monomer : non-sulfonable sulfonyl monomer = 6 : 4, 4 : 6) were first prepared through three synthetic steps: synthesis of trifluorovinylether-terminated monomers, thermal cycloaddition polymerization and post-sulfonation using chlorosulfonic acid (CSA). The composite membranes were then prepared by adjusting the concentrations (5~20 wt%) of the resulting copolymers impregnated in the PTFE films. The water uptake, ion exchange capacity (IEC) and ion conductivity of the composite membranes were characterized and compared with their unreinforced dense membranes and Nafion. All the synthesized compounds, monomers and polymers were characterized by $^1H$-NMR, $^{19}F$-NMR and FT-IR and the composite membranes were observed with scanning electron micrographs (SEM).
Keywords
composite membrane; PTFE; fluorinated polymer; proton exchange membrane; poly (arylene ether sulfone); fuel cell;
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