✦ LIBER ✦

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

✍ Scribed by D.I Ostrovskii; L.M Torell; M Paronen; S Hietala; F Sundholm

Publisher: Elsevier Science
Year: 1997
Tongue: English
Weight: 375 KB
Volume: 97
Category: Article
ISSN: 0167-2738
DOI: 10.1016/s0167-2738(97)00079-9

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✦ Synopsis

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 1008C, 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.

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