Korean Membrane Journal

The Membrane Society of Korea (한국막학회)
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Preparation and Characterization of Proton Conducting Composite Membranes From P(VDF-CTFE)-g-PSPMA Graft Copolymer and Heteropolyacid

  • Seo, Jin-Ah (Department of Chemical and Biomolecular Engineering, Yonsei University) ;
  • Roh, Dong-Kyu (Department of Chemical and Biomolecular Engineering, Yonsei University) ;
  • Koh, Jong-Kwan (Department of Chemical and Biomolecular Engineering, Yonsei University) ;
  • Kim, Jong-Hak (Department of Chemical and Biomolecular Engineering, Yonsei University)
  • Published : 2008.12.31
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Abstract

Proton conducting composite membranes were prepared by solution blending of poly(vinylidene fluoride-co-chlorotrifluoroethylene)-graft-poly(sulfopropyl methacrylate) (P(VDF-CTFE)-g-PSPMA) graft copolymer and heteropolyacid (HPA). The P(VDF-CTFE)-g-PSPMA graft copolymer was synthesized by atom transfer radical polymerization (ATRP) using direct initiation of the secondary chlorines of P(VDF-CTFE). FT-IR spectroscopy revealed that HPA nanoparticles were incorporated into the graft copolymer via hydrogen bonding interactions. The water uptake of membranes continuously decreased with increasing HP A concentration up to 45wt%, after which it slightly increased. It is presumably due to the decrease in number of water absorption sites due to hydrogen bonding interaction between the HP A particles and the polymer matrix. The proton conductivity of membranes increased with increasing HPA concentration up to 45wt%, resulting from both the intrinsic conductivity of HP A particles and the enhanced acidity of the sulfonic acid of the graft copolymer.

Keywords

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