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Preparation and Characterization of Proton Conducting Crosslinked Membranes Using Polymer Blends  

Kim, Jong-Hak (Department of Chemical Engineering, Yonsei University)
Lee, Do-Kyoung (Department of Chemical Engineering, Yonsei University)
Choi, Jin-Kyu (Department of Chemical Engineering, Yonsei University)
Seo, Jin-Ah (Department of Chemical Engineering, Yonsei University)
Roh, Dong-Kyu (Department of Chemical Engineering, Yonsei University)
Publication Information
Membrane Journal / v.17, no.4, 2007 , pp. 311-317 More about this Journal
Abstract
Proton conducting crosslinked membranes have been prepared by polymer blending, which consist of poly(vinyl alcohol-co-ethylene) (PVA-co-PE) and poly(styrene sulfonic acid-co-maleic acid) (PSSA-co-PMA) at 50 : 50 wt ratio. Two kinds of PSSA-co-PMA copolymer with 3 : 1 and 1 : 1 the molar ratio of PSSA to PMA wereused as a proton conducting source. The ethylene content of PVA-co-PE was also changed as 0, 27 and 44 mol%. The membranes were thermally crosslinked via the esterification reaction between -OH of PVA and -COOH of PMA, as demonstrated by FT-IR spectroscopy (PVA-co-PE)/(PSSA-co-PMA) membranes with 3 : 1 the molar ratio of PSSA to PMA showed higher ion exchange capacity (IEC), lower water uptake and higher proton conductivity than those with 1 : 1 molar ratio. As the PE concentration increased, the IEC values, water uptake and proton conductivities decreased continuously. These properties were elucidated in terms of competitive effect between the concentration of sulfonic acid, hydrophilicity and the crosslinked structure of membranes.
Keywords
polymer electrolyte membrane; polymer blends; fuel cell; proton conductivity; crosslinked;
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