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- W2083151427 abstract "A high density polyethylene was spin-labelled by the reaction of the alkyl type free radical, with 2,4,6-tri-t-butyl nitrosobenzene as a spin-trapping reagent. Extrema separations and line widths of e.s.r. spectrum of nitroxide free radicals were obtained and used in order to calculate correlation times of the motion of the label in a wide temperature range. Spin rotational frequencies of free radicals were compared with the correlation frequencies obtained from a relaxation map which revealed α-, β- and γ-relaxation processes in solid polyethylene. It was concluded that the motional narrowing of the line width in the high temperature region 283–343 K with an activation energy of 9.2 kcal/mol, was caused by the β-relaxation process, which is normally attributed to the large scale segmental motion over the whole molecular chain in the amorphous phase. The decrease of the extrema separation in the higher temperature region 353–383 K was conisdered due to the same mechanism of the relaxation observed in the 283–343 K region in the case of the line width study. These e.s.r. techniques gave lower activation energies of β-relaxation process than those obtained by dielectric and mechanical relaxation measurements. This discrepancy was interpreted in terms of the distribution of relaxation times. The relaxation spectrum for the β-process was discussed based on the Miyake equation." @default.
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- W2083151427 date "1980-11-01" @default.
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- W2083151427 title "Relaxation processes and mobility of spin labelled polyethylene" @default.
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- W2083151427 doi "https://doi.org/10.1016/0032-3861(80)90198-6" @default.
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