An ESR study of the gamma radiolysis of aromatic polyesters containing isomeric naphthalene links

Hill, D. J. T., Choi, B. K., Ahn, H. K. and Choi, E. J. (2001) An ESR study of the gamma radiolysis of aromatic polyesters containing isomeric naphthalene links. Radiation Physics And Chemistry, 62 1: 195-201. doi:10.1016/S0969-806X(01)00438-8


Author Hill, D. J. T.
Choi, B. K.
Ahn, H. K.
Choi, E. J.
Title An ESR study of the gamma radiolysis of aromatic polyesters containing isomeric naphthalene links
Journal name Radiation Physics And Chemistry   Check publisher's open access policy
ISSN 0969-806X
Publication date 2001
Sub-type Article (original research)
DOI 10.1016/S0969-806X(01)00438-8
Volume 62
Issue 1
Start page 195
End page 201
Total pages 7
Place of publication Oxford, UK
Publisher Pergamon
Collection year 2001
Language eng
Subject C1
250599 Macromolecular Chemistry not elsewhere classified
780103 Chemical sciences
Abstract Six polyesters were synthesised from 4,4 ' -oxy-bis(benzoyl chloride) and 1,4-, 1,5-, 1,6-, 2,3-, 2,6-, and 2,7-naphthalenediol isomers. The structures of the polyesters were characterised by means of IR, inherent viscosities in tetrachloroethane (TCE), solutions at 303 K and thermal analysis. The glass transition temperatures were in the range of 425-494 K by DSC thermal analysis. All of the polyesters were irradiated in an AECL Gammacell 220 unit at a dose rate of approximately 6.7 kGy/h to doses in the range of 0-15 kGy at 77 and 300 K. ESR spectroscopy was used to examine the radicals formed during radiolysis and to measure their yields. The G-values for radical formation in the polyesters were found to be in the range 0.18-1.41 at 77 K and 0.19-0.78 at 300 K. At 77 K, up to 15% of the radicals formed on radiolysis were found to be photo-bleachable anion radicals. Annealing experiments were carried out in order to identify the neutral radicals, which were assigned to naphthyl- or phenyl- and phenoxyl-type radicals. (C) 2001 Elsevier Science Ltd. All rights reserved.
Keyword Chemistry, Physical
Nuclear Science & Technology
Physics, Atomic, Molecular & Chemical
Aromatic Polyesters
Synthesis
Sensitivity To Gamma-radiolysis
Esr Study
Electron-spin-resonance
Radiation
Acid)
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Chemistry and Molecular Biosciences
 
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