New structure formation on gamma-irradiation of poly(chlorotrifluoroethylene)

Hill, D. J. T., Thurecht, K. J. and Whittaker, A. K. (2003) New structure formation on gamma-irradiation of poly(chlorotrifluoroethylene). Radiation Physics And Chemistry, 67 6: 729-736. doi:10.1016/S0969-806X(03)00004-5

Author Hill, D. J. T.
Thurecht, K. J.
Whittaker, A. K.
Title New structure formation on gamma-irradiation of poly(chlorotrifluoroethylene)
Formatted title
New Structure Formation on γ-irradiation of Poly(chlorotrifluoroethylene)
Journal name Radiation Physics And Chemistry   Check publisher's open access policy
ISSN 0969-806X
Publication date 2003-08-01
Sub-type Article (original research)
DOI 10.1016/S0969-806X(03)00004-5
Volume 67
Issue 6
Start page 729
End page 736
Total pages 8
Place of publication UK
Publisher Pergamon
Collection year 2003
Language eng
Subject C1
250502 Physical Chemistry of Macromolecules
780103 Chemical sciences
Abstract The radiation chemistry of PCTFE at different temperatures has been studied. The polymer was irradiated under vacuum to absorbed doses of up to 1500 kGy. Three irradiation temperatures were chosen. These included ambient temperature, a temperature well above the T, and a temperature above the crystalline melting temperature. These were 298, 423 and 493 K, respectively. The formation of new structures was identified by solid-state FTIR and F-19 NMR. No branching was observed below the melting temperature, but branches were observed above the melting temperature. G-values for chain-end formation were 1.5 and 2.4 at room temperature and 423 K, respectively and the G-value for the formation of double bonds was found to be < 0.1. For the irradiations at 493 K, the G-values for the formation of chain ends, double bonds and branching points were 3.6, 0.2 and 0.5, respectively. The presence of long-chain branches within the polymer structure could not be proven for radiolysis at 493 K, but scission predominates and network formation does not occur upon irradiation. DSC studies of the polymers irradiated at ambient temperature were consistent with chain scission leading to an increase in the percentage crystallinity, as observed for other fluoropolymers. (C) 2003 Elsevier Science Ltd. All rights reserved.
Keyword Chemistry, Physical
Nuclear Science & Technology
Physics, Atomic, Molecular & Chemical
F-19 Nmr Study
New Structure Formation
Radiolysis Mechanism
Induced Cross-linking
Speed Mas-nmr
F-19 Nmr
Q-Index Code C1

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Created: Wed, 15 Aug 2007, 01:48:44 EST