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Titolo:
Phase separation and crystallinity in proton conducting membranes of styrene grafted and sulfonated poly(vinylidene fluoride)
Autore:
Hietala, S; Paronen, M; Holmberg, S; Nasman, J; Juhanoja, J; Karjalainen, M; Serimaa, R; Toivola, M; Lehtinen, T; Parovuori, K; Sundholm, G; Ericson, H; Mattsson, B; Torell, L; Sundholm, F;
Indirizzi:
Univ Helsinki, Polymer Chem Lab, FIN-00014 Helsinki, Finland Univ Helsinki Helsinki Finland FIN-00014 ab, FIN-00014 Helsinki, Finland Abo Akad Univ, Dept Polymer Technol, FIN-20500 Turku, Finland Abo Akad Univ Turku Finland FIN-20500 Technol, FIN-20500 Turku, Finland Univ Helsinki, Electron Microscopy Unit, FIN-00014 Helsinki, Finland Univ Helsinki Helsinki Finland FIN-00014 it, 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 HUT, FinlandHelsinki Univ Technol HUT Finland FIN-02015 Lab, FIN-02015 HUT, Finland
Titolo Testata:
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
fascicolo: 12, volume: 37, anno: 1999,
pagine: 1741 - 1753
SICI:
0887-624X(19990615)37:12<1741:PSACIP>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
ION-EXCHANGE MEMBRANES; TEFLON-FEP FILMS; FUEL-CELLS; RADIATION; POLYSTYRENE; PVDF; ACID; POLYMERS; PERFORMANCE;
Keywords:
poly(vinylidene fluoride); irradiation grafting; sulfonation; crosslinking; proton conductivity; phase separation; electron microscopy; atomic force microscopy;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
33
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:
S. Hietala et al., "Phase separation and crystallinity in proton conducting membranes of styrene grafted and sulfonated poly(vinylidene fluoride)", J POL SC PC, 37(12), 1999, pp. 1741-1753

Abstract

A series of proton exchange membranes have been prepared by the preirradiation grafting method. Styrene was grafted onto a. matrix of poly(vinylidenefluoride) (PVDF) after electron beam irradiation. Part of the samples was crosslinked with divinylbenzene (DVB) or bis(vinylphenyl)ethane (BVPE). Subsequent sulfonation gave membranes grafted with poly(styrene sulfonic acid)and marked PVDF-g-PSSA. It was found that the intrinsic crystallinity of the matrix decreased in both the grafting and the sulfonation reaction in all the membranes. The graft penetration and the ion conductivity are influenced strongly by the crosslinker. The ion conductivity is considerably lowerin crosslinked membranes than in noncrosslinked ones. Generally, the mechanical strength decreases with crosslinking. The membranes show a regular phase separated structure in which the sulfonated grafts are incorporated in the amorphous parts of the matrix polymer. The phase separated domains are small, of the order of magnitude of 100-250 nm. These were resolved on transmission electron micrographs and on atomic force images but could not be resolved with microprobe Raman spectroscopy. (C) 1999 John Wiley & Sons, Inc.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/11/20 alle ore 21:57:42