J. Phys. IV France 10 (2000) Pr7-279-Pr7-281
Proton and water transport in nano-separated polymer membranesK.D. Kreuer, M. Ise, A. Fuchs and J. Maier
Max-Planck-Institut für Festkörperforschung, Heisenbergstr. 1, 70569 Stuttgart, Germany
The microstructure of proton conducting polymers (NAFION and a sulfonated polyetherketone) has been investigated by SAXS and the results are related to coefficients of transport in thermodynamic equilibrium (water-self diffusion and proton mobility) as well as hydrodynamic transport (water permeation and electroosmotic drag) as obtained from NMR, impedance spectroscopic and permeation experiments. A model comprising (i) simple geometric effects, (ii) effects of chemical interactions and (iii) the formation of inner space charges provides a semiquantitative scheme which relates the microstructure to the transport properties of such types of polymers.
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