Transient Network Structure of ABA Triblock Copolymer Solution and Its Deformation and Reconstruction Behavior

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Other Title
  • ABAトリブロック共重合体溶液の組み替え網目構造とその変形・回復挙動
  • ABA トリブロック キョウジュウゴウタイ ヨウエキ ノ クミカエ アミメ コウゾウ ト ソノ ヘンケイ カイフク キョドウ

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Abstract

Transient network structures of ABA triblock copolymer, poly(methyl methacrylate)-block-poly(tert-butyl acrylate)-block-poly(methyl methacrylate) (PMMA-PtBuA-PMMA) in a solvent selective for the middle block have been investigated by means of small-angle X-ray scattering (SAXS) and viscoelastic measurements. In the SAXS profiles for solutions just above a sol-gel transition concentration, no correlation peaks corresponding to distances between PMMA cores bridged by PtBuA chain were observed, suggesting that significant amounts of PMMA associated cores are not included in the transient network. Even after step shear flow performed on 8.0 wt% solution in physical gel state, the linear dynamic viscoelasticity was almost identical with the result obtained before the shear flow. On the other hand, the step shear flow for 4.4 wt% solution reduced the plateau storage modulus by almost half. These linear and nonlinear viscoelasticities revealed that the deformation and reconstruction behavior of the transient network by the shear flow is influenced by the denseness of the network structure as well as by the association strength of the PMMA core.<br>

Journal

  • KOBUNSHI RONBUNSHU

    KOBUNSHI RONBUNSHU 64 (5), 309-316, 2007

    The Society of Polymer Science, Japan

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