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- W1981476872 abstract "ESR spectra of the trapped radicals in an ultra-high molecular weight polyethylene (UHMW-PE) fiber irradiated by gamma rays showed well-resolved hyperfine splitting at room temperature since the c-axis of the crystallites is aligned with the fiber direction and the radicals are trapped in crystallites. The alkyl radical (−CH2−•CH−CH2−) was the major product after irradiation in vacuum and in air at room temperature. Some of the alkyl radicals converted to allyl radicals (−CH2−•CH−CH=CH−) and polyenyl radicals (−CH2−•CH−(CH=CH)n−CH2−) during storage in vacuum. Upon storage in air atmosphere, the alkyl radicals decayed by reaction with oxygen. Of particular interest is the very slow decay rate of the alkyl radical trapped in UHMW-PE fiber, the half-life is 26 days in vacuum, and 13 days in air at room temperature, which is about 1/30 and 1/100 of that reported for high density polyethylene (HDPE), respectively. The extremely long lifetime of the alkyl radical is supposed to be caused by the large size of crystallites in UHMW-PE fiber. The rate of radical decay was accelerated by annealing at elevated temperature." @default.
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- W1981476872 date "2010-04-01" @default.
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- W1981476872 title "ESR study of free radicals in UHMW-PE fiber irradiated by gamma rays" @default.
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- W1981476872 doi "https://doi.org/10.1016/j.radphyschem.2009.11.007" @default.
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