Degradation of poly(2,6-dimethylphenylene oxide) and poly(phenylene sulfide) by gamma irradiation

David J.T. Hill, David S. Hunter, David A. Lewis, James H. O'Donnell, Peter J. Pomery

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2 Citations (Scopus)


Electron spin resonance (ESR) spectroscopy and volatile product analysis have been used to examine the degradation of poly[oxy(2,6-dimethyl-1,4-phenylene)], PPO, and poly(thio-1,4-phenylene), PPS, by α-radiation. Radiation chemical yields (G-values) for trapped radicals were 0.60 and 0.16 after irradiation at 77 K, and 0.33 and 0.04 after irradiation at 300 K, for PPO and PPS, respectively. The ESR spectra of PPO can be analyzed in terms of PhO·, PhCH2· and cyclohexadienyl radicals, whereas PPS contained predominantly photobleachable radical ions. G(H2) = 0.08 and G(CH4) = 0.015 for PPO irradiated at 300 K; G(H2) = 0.03 for PPS. The radicals in PPO indicate main-chain scission of the Ph-O bond and loss of H from CH3 in equal amounts. The radical ions in PPS decayed without the formation of neutral radicals indicating little bond scission and extremely high radiation resistance, which is confirmed by the low G(R) and G(H2) values.

Original languageEnglish
Pages (from-to)559-563
Number of pages5
JournalInternational Journal of Radiation Applications and Instrumentation. Part
Issue number4
Publication statusPublished - 1990
Externally publishedYes


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