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Preparation and Characterization of Proton Conducting Crosslinked Membranes Based On Poly(vinyl chloride) Graft Copolymer  

Kim, Jong-Hak (Department of Chemical and Biomolecular Engineering, Yonsei University)
Koh, Jong-Kwan (Department of Chemical and Biomolecular Engineering, Yonsei University)
Choi, Jin-Kyu (Department of Chemical and Biomolecular Engineering, Yonsei University)
Park, Jung-Tae (Department of Chemical and Biomolecular Engineering, Yonsei University)
Koh, Joo-Hwan (Department of Chemical and Biomolecular Engineering, Yonsei University)
Publication Information
Membrane Journal / v.18, no.4, 2008 , pp. 261-267 More about this Journal
Abstract
A graft copolymer consisting of poly(vinyl chloride) (PVC) backbone and poly(hydroxyethyl acrylate) (PHEA) side chains was synthesized via atom transfer radical polymerization (ATRP). Direct initiation of the secondary chlorines of PVC facilitates grafting of hydrophilic PHEA monomer. This graft copolymer, i.e. PVC-g-PHEA was cross-linked with sulfosuccinic acid (SA) via the esterification reaction between -OH of the graft copolymer and -COOH of SA, as confirmed by FT-IR spectroscopy. Ion exchange capacity (IEC) continuously increased to 0.87meq/g with increasing concentrations of SA, due to the increasing portion of charged groups in the membrane. However, the water uptake increased up to 20.0wt% of SA concentration above which it decreased monotonically. The membrane also exhibited a maximum proton conductivity of 0.025 S/cm at 20.0 wt% of SA concentration, which is presumably due to competitive effect between the increase of ionic sites and the crosslinking reaction.
Keywords
polymer electrolyte membrane; graft copolymer; crosslinking; proton conductivity; fuel cell;
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Times Cited By KSCI : 4  (Citation Analysis)
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