Effects of Flow History on the Crystallization of Polyethylenes with Different Molecular Weight Distributions

DOI Web Site 1 Citations 7 References
  • NAKASHIMA Yuji
    Inst. for Materials Chem. and Eng., and Dept. of Molecular. & Material Sci., Kyushu Univ.
  • HASEGAWA Satoshi
    Inst. for Materials Chem. and Eng., and Dept. of Molecular. & Material Sci., Kyushu Univ.
  • TAKADA Akihiko
    Inst. for Materials Chem. and Eng., and Dept. of Molecular. & Material Sci., Kyushu Univ.
  • TAKAHASHI Yoshiaki
    Inst. for Materials Chem. and Eng., and Dept. of Molecular. & Material Sci., Kyushu Univ.

Bibliographic Information

Other Title
  • 分子量分布が異なるポリエチレンの結晶化に対する流動履歴の影響
  • ブンシリョウ ブンプ ガ コトナル ポリエチレン ノ ケッショウカ ニ タイスル リュウドウ リレキ ノ エイキョウ

Search this article

Abstract

Effects of shear flow history on the degree of crystallization of high density polyethylenes with broad molecular weight distributions are examined by conventional DSC measurements in connection with slight differences in molecular weight distributions. It was observed that the shear rate where the degree of crystallization starts to increase is related to the shear rate where the shear thinning is observed. By comparing the data for samples showing almost the same viscosity behavior but having slightly different molecular weight distributions, it was observed that the degree of crystallization for the sample containing small amounts of longer chains become slightly higher, which is consistent with the idea that the small portions of long chains become crystalline precursors. It was also observed that a long time, longer than the mechanical relaxation time, is needed to erase the effects of flow.

Journal

Citations (1)*help

See more

References(7)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top