Proton conducting membranes from sulfonated poly[bis(phenoxy)phosphazenes] with an interpenetrating hydrophilic network
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| Title: | Proton conducting membranes from sulfonated poly[bis(phenoxy)phosphazenes] with an interpenetrating hydrophilic network |
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| Authors: | Burjanadze, M.1, Paulsdorf, J.1, Kaskhedikar, N.2, Karatas, Y.2, Wiemhöfer, H.-D.1 hdw@uni-muenster.de |
| Source: | Solid State Ionics. Oct2006, Vol. 177 Issue 26-32, p2425-2430. 6p. |
| Subjects: | Ion exchange (Chemistry), Exchange reactions, Ion-permeable membranes, High temperatures |
| Abstract: | Abstract: Proton conducting membranes have been prepared using sulfonated poly[bis(phenoxy)phosphazene] (s-BPP) trapped in a cross-linked interpenetrating hydrophilic network of hexa(vinyloxyethoxyethoxy)cyclotriphosphazene (CVEEP). Membranes with good mechanical and thermal stabilities were obtained exhibiting high ion exchange capacities in the range of 1.62–1.79 mmol/g. The proton conductivity was measured as a function of water partial pressure in nitrogen (0 mbar to 25 mbar) in the temperature range 25 °C to 75 °C. At 25 mbar water partial pressure and 75 °C, a conductivity of 2.2×10−4 S/cm was obtained for s-BPP with a network made of 50 wt.% CVEEP. After immersion in water, the conductivity increased up to 0.013 S/cm at 25 °C. The hydrophilic nature of the CVEEP network stabilizes the water content and enhances the proton conductivity at elevated temperatures. [Copyright &y& Elsevier] |
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| Database: | Engineering Source |
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