Abstract
Large and small-angle X-ray diffraction was used to study the changes in the density of amorphous regions an elastic stressing of oriented PE films of different molecular weights. It was established that the value and sign of thermal effect of elastic deformation and the rule of variation of average density of amorphous regions are determined by the quantitative ratio of processes of condensation and thinning of amorphous ranges. It was shown that condensation of amorphous domains with elastic stressing takes place mainly in regions between fibrils, while thinning is in intrafibrillar regions. In proportion to the increase in the molecular weight of PE, the role of condensation of inter-fibrillar amorphous domains increases with elastic stressing of oriented samples.
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