Glassy State and Glass Transition-Its Elucidation and New Applications. II. Molecular Dynamics Simulation Study on the Bulk Modulus above and below the Glass Transition Temperature.

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  • ガラス状態とガラス転移―その解明と応用への新展開　ＩＩ　分子動力学法を用いたガラス転移温度前後の体積弾性率の解析
  • ブンシ ドウリキガクホウ オ モチイタ ガラス テンイ オンド ゼンゴ ノ タ

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Bulk moduli of amorphous polymers such as polyethylene, polypropylene, and polyisobutylene were investigated in the wide temperature range near the glass transition temperatures by means of molecular dynamics simulations. The large changes in the bulk moduli from 1-2 GPa to 3-4 GPa with lowering temperature below the glass transition temperatures were calculated in the case of polyethylene and polyisobutylene. These calculations agreed well with experimental results that these polymer materials having an amorphous phase lose their rubber elasticity at temperatures below their glass transition temperatures. With some exceptions, the calculated values of bulk moduli in the wide temperature range were almost the same as the experimentally observed ones.

Journal

  • KOBUNSHI RONBUNSHU

    KOBUNSHI RONBUNSHU 53 (12), 852-859, 1996

    The Society of Polymer Science, Japan

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