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In situ electron spin resonance study of styrene grafting of electron irradiated fluoropolymer films for fuel cell membranes

✍ Scribed by Svetlin Mitov; Gerold Hübner; Hans-Peter Brack; Günther G. Scherer; Emil Roduner

Book ID
105338454
Publisher
John Wiley and Sons
Year
2006
Tongue
English
Weight
215 KB
Volume
44
Category
Article
ISSN
0887-6266

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✦ Synopsis

Abstract

Three different electron beam irradiated fluoropolymers (ETFE, FEP, and PVDF) as well as their grafting reactions with styrene in different diluents were investigated by means of electron spin resonance (ESR). Depending on the atmosphere during irradiation, ESR spectra of peroxy and alkyl radicals were observed. Radical decay as a function of time and temperature was investigated in the presence and absence of solvent. Grafting levels and number of monomer units per chain were calculated for both types of radicals. Irradiation atmosphere, grafting temperature, and added solvent affect the morphology of the fluoropolymers, in particular the crystalline versus amorphous fractions and their swelling. They thus influence the rate at which the initial radicals at the polymer backbone are reached during the grafting process. © 2006 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 44: 3323–3336, 2006

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Electron spin resonance studies on graft
Electron spin resonance studies on graft copolymerization of gaseous styrene onto preirradiated polypropylene. I. Preirradiation in the presence of oxygen
✍ Eda, Bunzo ;Nunome, Keichi ;Iwasaki, Machio 📂 Article 📅 1970 🏛 Wiley (John Wiley & Sons) 🌐 English ⚖ 606 KB

## Abstract Graft copolymerization of gaseous styrene was carried out onto polypropylene preirradiated in the presence of oxygen at −78°C and at room temperature, respectively. The origin of the graft initiation activities of these polymers was investigated by means of electron spin resonance (ESR)