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Received February 12, 2007
Accepted March 10, 2007
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Modification of Nafion membranes by incorporation of cationic polymers for reduction of methanol permeability
Department of Chemical Engineering, Polymer Technology Institute, Sungkyunkwan University, Suwon, Gyunggi 440-746, Korea
djkim@skku.edu
Korean Journal of Chemical Engineering, November 2007, 24(6), 1101-1105(5), 10.1007/s11814-007-0128-1
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Abstract
A small amount of basic polymer was incorporated in the Nafion membrane. Compared with the re-cast Nafion membrane, the Nafion/basic polymer membrane reduced the methanol permeability considerably. The equilibrium water uptake and proton conductivity decreased, but the thermal and mechanical stability was enhanced with increasing concentration of basic polymer. These property changes were caused by formation of cation/anion complex between acidic Nafion and basic polymer molecules. The effects of the types and molecular weights of basic polymers on the methanol permeability and proton conductivity were not significant.
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Dimitrova P, Friedrich KA, Vogt B, Stimming U, J. Electroanal. Chem., 532(1-2), 75 (2002)
Kim J, Kim B, Jung B, J. Membr. Sci., 207(1), 129 (2002)
Kreuer KD, J. Membr. Sci., 185(1), 29 (2001)
Hsu WY, Barkley JR, Meakin P, Macromolecules, 13, 198 (1980)
Gierke TD, Munn GE, Wilson FC, J. Polym. Sci. B: Polym. Phys., 19, 1687 (1981)
Bae B, Ha HY, Kim D, J. Electrochem. Soc., 152(7), 1366 (2005)
