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Titolo:
Structure of sulfonated poly(vinyl fluoride)
Autore:
Paronen, M; Karjalainen, M; Jokela, K; Torkkeli, M; Serimaa, R; Juhanoja, J; Ostrovskii, D; Sundholm, F; Lehtinen, T; Sundholm, G; Torell, L;
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 Univ Helsinki, Electron Microscopy Unit, FIN-00014 Helsinki, Finland Univ Helsinki Helsinki Finland FIN-00014 it, FIN-00014 Helsinki, Finland Chalmers Univ Technol, Dept Phys, S-41296 Gothenburg, Sweden Chalmers UnivTechnol Gothenburg Sweden S-41296 41296 Gothenburg, Sweden Helsinkilandv Technol, Lab Electrochem & Phys Chem, FIN-02015 Helsinki, Fin Helsinki Univ Technol Helsinki Finland FIN-02015 FIN-02015 Helsinki, Fin
Titolo Testata:
JOURNAL OF APPLIED POLYMER SCIENCE
fascicolo: 7, volume: 73, anno: 1999,
pagine: 1273 - 1284
SICI:
0021-8995(19990815)73:7<1273:SOSPF>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
MEMBRANES; RADIATION; WATER; PVDF; STATE;
Keywords:
poly(vinyl fluoride); irradiation; sulfonation; proton conductivity; fuel cell;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
33
Recensione:
Indirizzi per estratti:
Indirizzo: Paronen, M Univ Helsinki, Polymer Chem Lab, PB 55, FIN-00014 Helsinki, Finland Univ Helsinki PB 55 Helsinki Finland FIN-00014 lsinki, Finland
Citazione:
M. Paronen et al., "Structure of sulfonated poly(vinyl fluoride)", J APPL POLY, 73(7), 1999, pp. 1273-1284

Abstract

Sulfonated poly(vinyl fluoride) (PVF-SA) has been made by chemical sulfonation or radiation-induced sulfonation of commercial poly(vinyl fluoride) (PVF) films. The effects of the irradiation treatment and sulfonation on sulfonic acid distribution, crystallinity, state of water, and molecular organization have been examined. The results indicate that proton irradiation andsubsequent sulfonation produce a structure that is different from the onesproduced by the sulfonation of nonirradiated or electron beam (EB)-irradiated samples. The water uptake is higher in proton-irradiated samples than in the other samples. In addition, the portion of nonfreezing water is highest in proton-irradiated samples. Infrared spectra of the sulfonated samplesindicate that a large part of the freezing bound water is associated with the hydrophobic polymer backbone. However, this portion was smaller in the proton-irradiated sample than in the EB-irradiated sample. The proton-irradiated samples had a small-angle X-ray diffraction maximum with a corresponding Bragg spacing of 70 Angstrom, which was taken as evidence for the formation of ion-water cluster domains in the proton-irradiated samples. The ionconductivity was slightly lower in nonirradiated and in EB-irradiated membranes than in the proton-irradiated sulfonated samples in which the highestvalues were 10-20 mS/cm. (C) 1999 John Wiley & Sons, Inc.

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Documento generato il 02/12/20 alle ore 14:50:19