Water sorption properties of and the state of water in PVDF-based proton conducting membranes

A new proton conducting material, poly(vinylidene fluoride) (PVDF) grafted with polystyrene (PS) and sulfonated (PVDF–SPS), has been investigated with regard to water uptake and the state of water in the material. The water uptake was estimated for the materials exposed to liquid water, in the tempe...

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Bibliographic Details
Published in:Solid state ionics 1997-05, Vol.97 (1), p.315-321
Main Authors: Ostrovskii, D.I, Torell, L.M, Paronen, M, Hietala, S, Sundholm, F
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Exchange resins and membranes
Forms of application and semi-finished materials
Polymer industry, paints, wood
Proton conducting membranes
Radiation grafting
Raman scattering
Technology of polymers
Water uptake
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Summary:A new proton conducting material, poly(vinylidene fluoride) (PVDF) grafted with polystyrene (PS) and sulfonated (PVDF–SPS), has been investigated with regard to water uptake and the state of water in the material. The water uptake was estimated for the materials exposed to liquid water, in the temperature range between 22 and 100°C, and to water vapour of different water activities. The water uptake from saturated water vapour was found to be close to that from liquid water. The state of the absorbed water has been studied by Raman spectroscopy. We found that in the porous materials the state of water is similar to that of bulk water whereas in the non-porous samples a significant part of the absorbed water differs from that of the bulk.
ISSN:0167-2738
1872-7689
DOI:10.1016/S0167-2738(97)00079-9