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Preparation and Characterization of Proton Conducting Crosslinked P(VDF-co-CTFE)-MAA/SEMA membranes  

Patel, Rajkumar (Department of Chemical and Biomolecular Engineering, Yonsei University)
Lei, Zeng Xiao (Department of Chemical and Biomolecular Engineering, Yonsei University)
Heo, Sung Yeon (Department of Chemical and Biomolecular Engineering, Yonsei University)
Kim, Jong Hak (Department of Chemical and Biomolecular Engineering, Yonsei University)
Publication Information
Membrane Journal / v.23, no.4, 2013 , pp. 290-296 More about this Journal
Abstract
Poly(vinylidenefluoride-co-chlorotrifluoroethylene) P(VDF-co-CTFE) polymer was attached to methacrylic acid (MAA) in the presence of 1,8-diazabicyclo[5,4,0]undec-7-ene(DBU) catalyst to prepare P(VDF-co-CTFE)-MAA copolymer. The modified P(VDF-co-CTFE)-MAA was polymerized with 2-sulfoethyl methacrylate (SEMA) monomer in the presence of 4',4'-azobis(4-cyanovaleric acid(ACVA) initiator by free radical polymerization to form the proton conducting membrane. The ratio of the SEMA was increased in the membrane to increase the presence of the acidic group. The maximum IEC value that was observed at 50% SEMA was around 0.82 meq/g, which is consistent with the water uptake value. The highest proton conductivity achieved by P(VDF-co-CTFE)-MAA/SEMA membrane with 50% SEMA was approximately 0.041 S/cm. This indicates that the available ionic group for the proton conduction increases with the increase in the SEMA in the membrane.
Keywords
polymer electrolyte membrane; crosslinking; proton conductivity; fuel cell;
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