Trapped radical behavior of electron beam irradiated polytetrafluoroethylene fine powder at various temperatures

Abstract Polytetrafluoroethylene (PTFE) fine powder with 93% crystallinity was irradiated by an electron beam (EB) at various temperatures under a nitrogen atmosphere. Trapped free radicals in PTFE were studied using electron spin resonance (ESR) spectroscopy. The observed spectra of the samples exp...

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Autores principales:	Akihiro Oshima, Hiroto Horiuchi, Atsushi Nakamura, Shun Kobayashi, Ayana Terui, Ayano Mino, Ryoya Shimura, Masakazu Washio
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/4a1c4b8b766c45d4be5719b2166ab9f4
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spelling	oai:doaj.org-article:4a1c4b8b766c45d4be5719b2166ab9f42021-12-02T15:00:59ZTrapped radical behavior of electron beam irradiated polytetrafluoroethylene fine powder at various temperatures10.1038/s41598-021-90462-62045-2322https://doaj.org/article/4a1c4b8b766c45d4be5719b2166ab9f42021-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-90462-6https://doaj.org/toc/2045-2322Abstract Polytetrafluoroethylene (PTFE) fine powder with 93% crystallinity was irradiated by an electron beam (EB) at various temperatures under a nitrogen atmosphere. Trapped free radicals in PTFE were studied using electron spin resonance (ESR) spectroscopy. The observed spectra of the samples exposed to air after irradiation at various temperatures showed asymmetrical signals, which are middle-chain type peroxide macroradicals derived from fluoroalkyl radicals. The radical yields at each irradiation temperature increased with increasing absorbed dose, and eventually saturated. The higher irradiation temperature resulted in higher radical yields when compared at the same exposed dose. Furthermore, the G-value of the radicals (G(R·)) increases with increasing irradiation temperatures corresponding to each relaxation and transition temperature. It is concluded that the chain reaction by the fluorine extraction from the main chain due to the end-chain radical generated via β-scission after dissociative electron attachment (DEA) is enhanced by the synergistic effect of heat and radiation.Akihiro OshimaHiroto HoriuchiAtsushi NakamuraShun KobayashiAyana TeruiAyano MinoRyoya ShimuraMasakazu WashioNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-7 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Akihiro Oshima Hiroto Horiuchi Atsushi Nakamura Shun Kobayashi Ayana Terui Ayano Mino Ryoya Shimura Masakazu Washio Trapped radical behavior of electron beam irradiated polytetrafluoroethylene fine powder at various temperatures
description	Abstract Polytetrafluoroethylene (PTFE) fine powder with 93% crystallinity was irradiated by an electron beam (EB) at various temperatures under a nitrogen atmosphere. Trapped free radicals in PTFE were studied using electron spin resonance (ESR) spectroscopy. The observed spectra of the samples exposed to air after irradiation at various temperatures showed asymmetrical signals, which are middle-chain type peroxide macroradicals derived from fluoroalkyl radicals. The radical yields at each irradiation temperature increased with increasing absorbed dose, and eventually saturated. The higher irradiation temperature resulted in higher radical yields when compared at the same exposed dose. Furthermore, the G-value of the radicals (G(R·)) increases with increasing irradiation temperatures corresponding to each relaxation and transition temperature. It is concluded that the chain reaction by the fluorine extraction from the main chain due to the end-chain radical generated via β-scission after dissociative electron attachment (DEA) is enhanced by the synergistic effect of heat and radiation.
format	article
author	Akihiro Oshima Hiroto Horiuchi Atsushi Nakamura Shun Kobayashi Ayana Terui Ayano Mino Ryoya Shimura Masakazu Washio
author_facet	Akihiro Oshima Hiroto Horiuchi Atsushi Nakamura Shun Kobayashi Ayana Terui Ayano Mino Ryoya Shimura Masakazu Washio
author_sort	Akihiro Oshima
title	Trapped radical behavior of electron beam irradiated polytetrafluoroethylene fine powder at various temperatures
title_short	Trapped radical behavior of electron beam irradiated polytetrafluoroethylene fine powder at various temperatures
title_full	Trapped radical behavior of electron beam irradiated polytetrafluoroethylene fine powder at various temperatures
title_fullStr	Trapped radical behavior of electron beam irradiated polytetrafluoroethylene fine powder at various temperatures
title_full_unstemmed	Trapped radical behavior of electron beam irradiated polytetrafluoroethylene fine powder at various temperatures
title_sort	trapped radical behavior of electron beam irradiated polytetrafluoroethylene fine powder at various temperatures
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/4a1c4b8b766c45d4be5719b2166ab9f4
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Trapped radical behavior of electron beam irradiated polytetrafluoroethylene fine powder at various temperatures

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