Chain scission and branching in irradiated poly(tetrafluoroethylene-co-hexafluoropropylene)

Hill, D. J. T., Mohajerani, S., Whittaker, A. K. and Scheler, U. (2003) Chain scission and branching in irradiated poly(tetrafluoroethylene-co-hexafluoropropylene). Polymer International, 52 11: 1725-1733. doi:10.1002/pi.1299

Author Hill, D. J. T.
Mohajerani, S.
Whittaker, A. K.
Scheler, U.
Title Chain scission and branching in irradiated poly(tetrafluoroethylene-co-hexafluoropropylene)
Journal name Polymer International   Check publisher's open access policy
ISSN 0959-8103
Publication date 2003-01-01
Year available 2003
Sub-type Article (original research)
DOI 10.1002/pi.1299
Open Access Status Not Open Access
Volume 52
Issue 11
Start page 1725
End page 1733
Total pages 9
Place of publication Chichester
Publisher John Wiley
Language eng
Subject C1
250502 Physical Chemistry of Macromolecules
780103 Chemical sciences
Abstract The radiation chemistry of poly(tetrafluoroethylene-co-hexafluoropropylene) (FEP) with a TFE mole fraction of 0.90 has been studied under vacuum using Co-60 gamma-radiation over a range of temperatures and absorbed doses. The radiolysis temperatures were 300, 363, 423, 523 and 543 K. New structure formation in the copolymers was analysed by solid-state F-19 NMR spectroscopy. The new structures formed in the copolymers have been identified and the G-values for the formation of new chemical structures have been investigated at 363 and 523 K. These two temperatures are just above and just below the polymer T-g and T-m, respectively. At the lower temperature, there was no evidence for any chain branching and an estimate of G(S) of 1.0 was obtained. A value of G(S) of 1.3 and a minimum value of G(X)(Y) of 1.3 were obtained at 523 K. (C) 2003 Society of Chemical Industry.
Keyword Polymer Science
Gamma Radiolysis
New Structures
Nmr Analysis
Induced Cross-linking
Radiation-modified Poly(tetrafluoroethylene)
F-19 Nmr
Mas Nmr
Q-Index Code C1
Institutional Status UQ

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Created: Wed, 15 Aug 2007, 11:56:10 EST