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- W2045985196 abstract "Electron spin resonance spectroscopy has been used to study the effects of 15 MeV electrons, x-rays, and ultraviolet radiation on poly-4-methylpentene-1 (TPX) both at 77°K and at room temperature. At least seven identifiably different paramagnetic species are observable in unstabilized oxygen-free TPX after irradiation, and additional species exist in the stabilized grades. The species which predominates under most conditions is interpreted as being due to the loss of hydrogen from a main-chain tertiary carbon atom; interpretations of most of the other species are also given. Oxygen is found to diffuse rapidly into the polymer and to react with the free radicals to form peroxy species. In the absence of oxygen the radiation damage is expected to lead ultimately to crosslinking or double-bond formation, or with oxygen to degradation. The general nature of the free radicals produced by electron or x-ray irradiation is the same, but there are significant differences for ultraviolet irradiation. The observed spectra for irradiated TPX and their interpretations are in good agreement with the spectra and later interpretations for irradiated polypropylene, but are in less satisfactory agreement with the published papers on polybutene-1 and poly-3-methylbutene-1." @default.
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- W2045985196 date "1971-06-01" @default.
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- W2045985196 title "ESR study of radiation damage in TPX polymer (poly-4-methylpentene-1)" @default.
- W2045985196 doi "https://doi.org/10.1002/pol.1971.160090603" @default.
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