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Titolo:
STRUCTURAL INVESTIGATION OF RADIATION GRAFTED AND SULFONATED POLY(VINYLIDENE FLUORIDE), PVDF, MEMBRANES
Autore:
HIETALA S; HOLMBERG S; KARJALAINEN M; NASMAN J; PARONEN M; SERIMAA R; SUNDHOLM F; VAHVASELKA S;
Indirizzi:
UNIV HELSINKI,POLYMER CHEM LAB,PB 55 FIN-00014 HELSINKI FINLAND UNIV HELSINKI,POLYMER CHEM LAB FIN-00014 HELSINKI FINLAND ABO AKAD UNIV,DEPT POLYMER TECHNOL FIN-20500 TURKU FINLAND UNIV HELSINKI,DEPT PHYS FIN-00014 HELSINKI FINLAND
Titolo Testata:
Journal of materials chemistry
fascicolo: 5, volume: 7, anno: 1997,
pagine: 721 - 726
SICI:
0959-9428(1997)7:5<721:SIORGA>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
PROTON-EXCHANGE MEMBRANES; TEFLON-FEP FILMS; ACRYLIC-ACID; STYRENE; POLYMERS; BEHAVIOR; CELLS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
31
Recensione:
Indirizzi per estratti:
Citazione:
S. Hietala et al., "STRUCTURAL INVESTIGATION OF RADIATION GRAFTED AND SULFONATED POLY(VINYLIDENE FLUORIDE), PVDF, MEMBRANES", Journal of materials chemistry, 7(5), 1997, pp. 721-726

Abstract

Radiation grafted and sulfonated poly(vinylidene fluoride), PVDF, membranes have been studied by thermal analysis and X-ray diffraction to determine the changes in membrane crystallinity and structure during preparation. Commercial PVDF films were irradiated with an electron beam, grafted with styrene and finally sulfonated. Both the crystallinityand the size of the crystallites of PVDF decrease in the grafting reaction. A further decrease in crystallinity is observed in the sulfonation reaction. The residual crystallinity of PVDF was considerable (10-20%) even in membranes which had been subjected to severe reaction conditions. These results can be explained by assuming that the grafting takes place mainly in the amorphous region of the PVDF, and close to the surfaces of the crystals, but that grafts do not penetrate into thecrystals. The proton conductivity of the grafted and sulfonated PVDF membranes reached values comparable to those of Nafion membranes.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 24/11/20 alle ore 22:49:54