低密度ポリエチレンの弾性について : 高分子のレオロジー

概要

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For all numerous studies, the mechanical properties of crystalline polymers have not been well-understood when compared with those of amorphous polymers which have been much clarified theoretically and experimentally. For example, such a fundamental problem as which phase in crystalline or non-crystalline phases contributes to that extent to the deformation processes of crystalline polymers, has been left unsolved. In this paper, the elastic recovery of a low density polyethylene stretched to various degree of % elongation is explained quantitatively in terms of the response of internal structures manifested by the changes of orientation factors of crystalline and non-crystalline phases and of degree of crystallinity, which are evaluated from simultaneous measurements of X-ray diffraction and of optical birefringence in the stretched and released states. The sample polymer used is a low density polyethylene (Mitsubishi Yukalon K-3202) having melt index of 3.5 and branched degree of 2.0 CH_3/100 carbon atoms, and the original test specimen gas been cast from melt into thin film of about 0.2 ,, thick by a hot press and annealed. The original specimen thus prepared is of a random nature without any preferential orientation of crystal axis.
社団法人日本材料学会の論文
1963-05-15