화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Macromolecular Research, Vol.15, No.5, 459-464, August, 2007
Export Citation
Sulfonated Dextran/Poly(vinyl alcohol) Polymer Electrolyte Membranes for Direct Methanol Fuel Cells
Jongok Won†, Su Mi Ahn, Hyun Dong Cho, Ji Young Ryu1, Heung Yong Ha1, and Yong Soo Kang2
  • Department of Applied Chemistry, Sejong University, Seoul 143-747, Korea
  • 1Fuel Cell Research Center, Korea Institute of Science and Technology, Seoul 136-791, Korea
  • 2Division of Chemical Engineering, Hanyang University, Seoul 133-791, Korea
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Polymer electrolyte membranes, featuring ionic channels, were prepared from sulfonated dextran/ poly(vinyl alcohol) (sD/PVA) membranes. A stiff sulfated dextran was chosen as the route for ionic transport, since ionic sites are located along the stiff dextran main chain. The sD/PVA blend membranes were annealed and then chemically crosslinked. The characteristics of the crosslinked sD/PVA membranes were investigated to determine their suitability as proton exchange membranes. The proton conductivity was found to increase with increasing amounts of sD inside the membrane, which reached a maximum and then decreased when the sD content exceeded 30 wt%, while the methanol permeability increased with increasing sD content. The good dispersion of sD inside the membrane, which serves as an ionic channels mimic, played a significant role in proton transportation.
Keywords:polymer electrolyte membranes;direct methanol fuel cells;poly(vinyl alcohol);dextran
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