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Titolo:
New polymer electrolyte membranes for low temperature fuel cells
Autore:
Ennari, J; Hietala, S; Paronen, M; Sundholm, F; Walsby, N; Karjalainen, M; Serimaa, R; Lehtinen, T; Sundholm, G;
Indirizzi:
Univ Helsinki, Polymer Chem Lab, FIN-00014 Helsinki, Finland Univ Helsinki Helsinki Finland FIN-00014 ab, FIN-00014 Helsinki, Finland Univ Helsinki, Dept Phys, FIN-00014 Helsinki, Finland Univ Helsinki Helsinki Finland FIN-00014 ys, FIN-00014 Helsinki, Finland Helsinki Univ Technol, Phys Chem & Electrochem Lab, FIN-02015 Espoo, Finland Helsinki Univ Technol Espoo Finland FIN-02015 , FIN-02015 Espoo, Finland
Titolo Testata:
MACROMOLECULAR SYMPOSIA
, volume: 146, anno: 1999,
pagine: 41 - 45
SICI:
1022-1360(199911)146:<41:NPEMFL>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
SULFONATED POLY(VINYLIDENE FLUORIDE); WATER-CONTENT; PVDF;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
16
Recensione:
Indirizzi per estratti:
Indirizzo: Ennari, J Univ Helsinki, Polymer Chem Lab, PB 55, FIN-00014 Helsinki, Finland Univ Helsinki PB 55 Helsinki Finland FIN-00014 elsinki, Finland
Citazione:
J. Ennari et al., "New polymer electrolyte membranes for low temperature fuel cells", MACRO SYMP, 146, 1999, pp. 41-45

Abstract

Partially fluorinated proton exchange materials were synthesised by pre-irradiation grafting of styrene into poly(vinylidene fluoride) films with subsequent sulfonation. The grafted and sulfonated membranes, PVDF-g-PSSA membranes, have been studied with respect to water uptake, ion and water clustering, ion conductivity and water diffusion coefficients. Water associates with the membranes in three different ways: bound non-freezable water, freezable bound water and freezable free water. The proton conductivity of the membrane is strongly dependent on the hydration, it decreases more rapidly than the water self diffusion with decreasing water content. Ion clusters with a Bragg distance of 25 Angstrom form the conducting channels in the membranes.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/11/20 alle ore 22:29:38