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Titolo:
The state of water and the nature of ion clusters in crosslinked proton conducting membranes of styrene grafted and sulfonated poly(vinylidene fluoride)
Autore:
Elomaa, M; Hietala, S; Paronen, M; Walsby, N; Jokela, K; Serimaa, R; Torkkeli, M; Lehtinen, T; Sundholm, G; Sundholm, F;
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 Helsinki, Finland Helsinki Univ Technol Helsinki Finland FIN-02015 02015 Helsinki, Finland
Titolo Testata:
JOURNAL OF MATERIALS CHEMISTRY
fascicolo: 12, volume: 10, anno: 2000,
pagine: 2678 - 2684
SICI:
0959-9428(2000)10:12<2678:TSOWAT>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Soggetto:
TEFLON-FEP FILMS; ANGLE X-RAY; EXCHANGE MEMBRANES; DIFFUSION-COEFFICIENTS; COPOLYMER MEMBRANES; POLYMER ELECTROLYTE; FUEL-CELLS; TRANSPORT; PVDF; ACID;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
45
Recensione:
Indirizzi per estratti:
Indirizzo: Sundholm, F Univ Helsinki, Polymer Chem Lab, PB 55, FIN-00014 Helsinki, Finland Univ Helsinki PB 55 Helsinki Finland FIN-00014 sinki, Finland
Citazione:
M. Elomaa et al., "The state of water and the nature of ion clusters in crosslinked proton conducting membranes of styrene grafted and sulfonated poly(vinylidene fluoride)", J MAT CHEM, 10(12), 2000, pp. 2678-2684

Abstract

Proton conducting membranes were prepared by irradiation grafting with styrene followed by sulfonation on matrices of poly(vinylidene fluoride), PVDF. Membranes crosslinked with divinylbenzene and/or bis(vinylphenyl)ethane were compared to non-crosslinked membranes. The ion conductivity of the crosslinked membranes is lower than that of the non-crosslinked membranes. Thisis due partly to the very inefficient sulfonation of the crosslinked membranes below the graft penetration level, which in turn leads to a low water uptake at low degrees of grafting. The graft penetration level is lower in crosslinked membranes than in non-crosslinked membranes. This leads to a more compact structure of the crosslinked grafts within the matrix. The lowerion conductivity in the crosslinked membranes is therefore partly also dueto restricted mobility of the ion clusters necessary for ion and water transport in the membranes.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/11/20 alle ore 21:09:40