화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Macromolecular Research, Vol.14, No.2, 214-219, April, 2006
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Nafion Composite Membranes Containing Rod-Shaped Polyrotaxanes for Direct Methanol Fuel Cells
Hyun Dong Cho, Jongok Won†, Heung Yong Ha1, and Yong Soo Kang2
  • Department of Applied Chemistry, University of Sejong, Seoul 143-747, Korea
  • 1Korea Institute of Science and Technology, Seoul, 136-791, Korea
  • 2Department of Chemical Engineering, Hanyang University, Seoul 133-791, Korea
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Cast Nafion-based composite membranes containing different amounts of organic, nanorod-shapedpolyrotaxane were prepared and characterized, with the aim of improving the properties of polymer electrolytemembranes for direct methanol fuel cell applications. Polyrotaxane was prepared using the inclusion-complex reactionbetween α-cyclodextrin and poly(ethylene glycol) (PEG) of different molecular weights. The addition of polyrotax-ane to Nafion changed the morphology and reduced the crystallinity. The conductivity of the composite membranesincreased with increasing polyrotaxane content up to 5wt%, but then decreased at higher polyrotaxane contents.Well-dispersed, organic polyrotaxane inside the membrane can provide a tortuous path for the transport of methanol,as the methanol permeability depends on the aspect ratio of polyrotaxane, which is controlled by the molecularweight of PEG. All of the Nafion-based, polyrotaxane composite membranes showed a higher selectivity parameterthan the commercial Nafion films did.
Keywords:polymer electrolyte membrane;direct methanol fuel cells;Nafion;polyrotaxane;composite membranes
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