Temperature-induced transformations of peroxide radicals formed in polytetrafluoroethylene with γ-ray irradiation |
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Authors: | T
ru Tagawa Hideo Amemiya Isao Shinohara Miyuki Hagiwara Tsutomu Kagiya |
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Institution: | Tōru Tagawa,Hideo Amemiya,Isao Shinohara,Miyuki Hagiwara,Tsutomu Kagiya |
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Abstract: | At 200°C, temperature-induced transformations of peroxide radicals from ? CF2CF(OO·)CF2? (radical I) to ? CF2CFCF2? (radical 1) and ? CF2CF2OO· (radical II) to ? CF2CF2 (radical 2) in vacuo, and from I to II in oxygen atmosphere were observed. In these thermal transformations, the evolution of CO2 with a small amount of CO and CF2O was observed. Further, measurements of the heat of crystallization of the treated polytetrafluoroethylene suggest that a reduction of polymer molecular weight occurs during the transformations from I to 1 and I to II. |
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