結晶性高分子のネッキング現象　ＩＶ　　圧延ポリエチレンのネック延伸

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タイトル別名
  • Neck Draw of Rolled Polyethylene
  • アツエン ポリエチレン ノ ネック エンシン ケッショウセイ コウブンシ ノ

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説明

In the previous thermodynamical study, we presented an equation to represent the necking stress of polyethylene in which crystalline phase and amorphous phase induced by fracture of crystallites are in equilibrium under tension. In this paper, the neck draw of a prerolled high-density polyethylene has been investigated with respect to the intermediate process during the deformation. The product of neck draw ratio of the rolled specimen and the roll ratio coincided with the neck draw ratio without roll and was independent of roll ratio. Furthermore, the necking stress, which means the tensile force devided by the area of cross section before roll, was equal to the stress without roll. These results were discussed in relation to the mechanisms of the deformation which involves the micronecking and tilting of lamella. By considering the successive conversion of lamella to a drawn structure by micronecking, the observed result concerning the necking stress could satisfactorily be explained. The melting of molecular chains during the tilting process was taken into consideration, because a part of chains in lamella was teared off from crystallites by the tension which was induced by the gliding of the folding part of chains crossing the glide plane. An equation for the stress of tilting was derived from a thermodynamical investigation on the microscopic mechanism of the deformation. This equation was found to be the same as that presented previously from a macroscopic consideration on neck draw.

収録刊行物

  • 高分子論文集

    高分子論文集 34 (7), 483-489, 1977

    公益社団法人 高分子学会

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