ポリエチレンの伸張応力緩和挙動について : 高分子のレオロジー : レオロジー特集号

概要

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In the previous paper of this series the tensile stress relaxation behavior of polyvinyl alcohol derivatives was investigated in order to clarify the validity of time-temperature superposition for the crystalline polymer systems ranging from semi- to quasi- crystalline. It was concluded that the hypothesis of time-temperature superposition should be invalid over the glass-transition and the leathery (rubbery) regions in contrast to the amorphous polymers, even if the hypothesis was valid within the respective regions, separetely. In this paper the tensile stress relaxation behavior of several types of polyethylene having different degree of branching has been investigated at various temperatures from -30℃ to near melting point within the limit of linear viscoelasticity and the validity of time-temperature superposition for the highly crystalline system having degree of crystallinity more than 50% has been examined. As is well known, the degree of crystallinity of polyethylene changes with temperature even in a temperature range considerably lower than the melting point, and this necessitates some corrections on the temperature dependence of relaxation modulus. Unless otherwise, the procedure of time-temperature superposition can not be carried out, actually.
社団法人日本材料学会の論文
1962-05-15