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The spin-lattice relaxation times (T1) of a series of branched polyethylenes has been measured between −175° and +100°C. An empirical separation of the relaxation attributed to the gamma process (centered at −26°C) permits investigation of the relaxation effects of methyl group reorientation and branch point motion. This motion of the branch points is related to the beta process observed by mechanical loss measurements and is found to be uncorrelated with motion of linear amorphous segments.
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Crist et al. (1970) studied this question.
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