Numerical Simulation of Phase Structure Development in Simple Shear Flow of Polymer Blends

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Other Title
  • 高分子ブレンドの流動を伴う相分離過程の数値シミュレーションの試み
  • コウブンシ ブレンド ノ リュウドウ オ トモナウ ソウ ブンリ カテイ ノ スウチ シミュレーション ノ ココロミ

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Abstract

Flowing meso-phase structures of binary polymer blends with and without viscoelastic features are simulated using a two fluid model with modified Cahn-Hilliard equation and double reptation mixing rule. The calculated system is thermodynamically unstable under quiescent conditions and tends to separate into two phases automatically. The modified Cahn-Hilliard model with viscoelastic network stress in simple shear flow predicts that phase separation leads to a co-continuous structure at early time and then decomposes into a layered structure, that is mixed in flow direction and separated into two phases in shear direction at near steady state. Furthermore, the ratio of shear modulus between a droplet and surrounding matrix influences the nature of the layer structure attained at steady state. When the droplet's shear modulus is larger than that of the matrix phase, the droplet causes a layer structure perpendicular to the flow direction.

Journal

  • Seikei-Kakou

    Seikei-Kakou 14 (4), 251-256, 2002

    The Japan Society of Polymer Processing

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