Structural analysis of PVA-based proton conducting membranes |
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| Institution: | 1. Department of Applied Physics, Chalmers University of Technology, SE-41296 Göteborg, Sweden;2. Department of Chemistry, University “La Sapienza”, P.le Aldo Moro 5, 00185 Rome, Italy;1. Advanced Polymer Laboratory, Department of Polymer Science & Technology, University of Calcutta, 92, A. P. C. Road, Kolkata 700 009, India;2. Department of Chemical Engineering, Indian Institute of Technology, Roorkee, Roorkee 247667, India;3. Department of Civil and Environmental Engineering, Indian Institute of Technology, Patna 801103, India;1. State Key Laboratory of Environment-friendly Energy Materials, Engineering Research Center of Biomass Materials (Ministry of Education), School of Materials and Chemistry, Southwest University of Science and Technology, Mianyang, 621010, PR China;2. School of Chemical Engineering, Sichuan University, Chengdu, 610065, PR China |
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| Abstract: | We have synthesized and characterized a new family of proton conducting membranes based on cross-linked poly(vinyl alcohol), PVA, and functionalized silica filler. Glutaraldehyde, GLA, was used as the cross-linking agent in order to improve chemical and thermal stabilities. The functionalization of the silica particles is such that terminal –SO3H groups are formed during membrane preparation, thus possibly providing additional mobile protons. We find that the crystallinity of the PVA-based membranes is enhanced by the presence of the functionalized silica particles, whereas it is reduced by means of cross-linking. The thermal stability of the ternary system PVA:GLA:silica is improved due to the additive contribution of GLA and silica. The conductivity of membranes swelled in a sulfuric acid solution was found to be of the order of 10− 1 S cm− 1. |
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