An ESR study of the gamma radiolysis of aromatic polyesters containing isomeric naphthalene links
- Authors
- Hill, DJT; Choi, BK; Ahn, HK; Choi, EJ
- Issue Date
- Jul-2001
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- aromatic polyesters; synthesis; sensitivity to gamma-radiolysis; ESR study
- Citation
- RADIATION PHYSICS AND CHEMISTRY, v.62, no.1, pp 195 - 201
- Pages
- 7
- Journal Title
- RADIATION PHYSICS AND CHEMISTRY
- Volume
- 62
- Number
- 1
- Start Page
- 195
- End Page
- 201
- URI
- https://scholarworks.bwise.kr/kumoh/handle/2020.sw.kumoh/27055
- DOI
- 10.1016/S0969-806X(01)00438-8
- ISSN
- 0969-806X
- 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.
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