Transient Viscoelastic Properties of Lamellae-Forming Diblock Copolymers with Flow-Induced Alignment

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  • TAKAHASHI Yoshiaki
    Institute for Materials Chemistry and Engineering & Department of Molecular & Materials Sciences, Kyushu University
  • IMAICHI Kenta
    Institute for Materials Chemistry and Engineering & Department of Molecular & Materials Sciences, Kyushu University
  • NODA Masahiro
    Department of Applied Chemistry, Nagoya University
  • TAKANO Atsushi
    Department of Applied Chemistry, Nagoya University
  • MATSUSHITA Yushu
    Department of Applied Chemistry, Nagoya University

Bibliographic Information

Other Title
  • 二元ブロック共重合体ラメラ相の流動配向にともなう非定常粘弾性
  • ニゲン ブロック キョウジュウゴウタイ ラメラソウ ノ リュウドウ ハイコウ ニ トモナウ ヒテイジョウ ネンダンセイ

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Abstract

The transient viscoelastic properties of lamellae-forming poly(styrene-block-2-vinylpyridine) and poly(styrene-d8-block-2-vinylpyridine) were measured to examine the alignment process of lamellae. Rescaled transient stress σ(t) after step increase of shear rate could not be scaled by strain or time, and the data showed poor reproducibility. σ(t) upon the onset of flow after a given rest time showed relatively large overshoot, while it instantaneously became steady upon the reverse of flow. These results suggest that the average degree of alignment is the same at the steady states, but the transient stresses are determined by the size and number of grains that undergo alignment.<br>

Journal

  • KOBUNSHI RONBUNSHU

    KOBUNSHI RONBUNSHU 64 (7), 437-440, 2007

    The Society of Polymer Science, Japan

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