The birefringence of irradiated polyethylene was observed as a function of temperature. The data are consistent with a mechanism in which crosslinking limits the growth and annealing of crystallites. Crosslinks formed in material which was oriented at the time the crosslinks were formed, results in an oriented gel. This effect explains the birefringence and the persistence of nucleation sites at high temperatures.
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Keneally et al. (1964) studied this question.
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