Entanglement among Polymers

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Other Title
  • 単一高分子鎖のサイエンス　　単一分子が描き出すからみ合い
  • タンイツ ブンシ ガ エガキダス カラミアイ

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Abstract

Entanglement among polymers is an established concept which stands for topological constraint on polymer dynamics in concentrated solutions and melts. Theories for polymer dynamics based on the entanglement idea such as reptation models and sliplink models have achieved remarkable success to reproduce experiments such as viscoelasticity. In the theories entanglement is assumed to be a dispersed structure carrying elasticity with relaxation and to corresponds a certain molecular weight much larger than Kuhn segment and much less than contour length. Though such a characteristic length has been confirmed experimentally, microscopic description of the entanglement among polymers has not been clarified yet. Recently methods to extract topological constraint in polymer melts by molecular simulations have been proposed by several groups independently and the topological network in the polymers has became observable. Comparison on statistics between the networks obtained by the molecular simulations and by the sliplink theories and simulations reveals the fact that structures of the networks originated from the theoretical assumptions of the sliplink and from the microscopic topological constraint among polymers are quite close. The similarity of the entanglement networks in different class of descriptions on polymers is promising link for multi-scale considerations though the nature of the network structures and the similarity are still open problems.

Journal

  • Kobunshi

    Kobunshi 56 (6), 412-415, 2007

    The Society of Polymer Science, Japan

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