目で見る高分子　高分子系がつくるパターン　ＩＩ　　スチレン‐ブタジエン‐スチレントリブロック共重合体のキャスト膜表面に形成される特異的凹凸パターンに与える気流の影響

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  • Visualized Polymers. Patterns Formed by Polymeric Systems. II. Influence of Air Stream on Peculiar Concentric-Ring Pattern of Surface Undulation on a Cast Film of a Styrene-Butadiene-Styrene Triblock Copolymer.
  • スチレンーブタジエンースチレントリブロック キョウジュウゴウタイ ノ キャスト マク ヒョウメン ニ ケイセイ サレル トクイテキ オウトツ パターン ニ アタエル キリュウ ノ エイキョウ

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It has been found that a peculiar concentric-ring pattern of surface undulation is macroscopically formed on a cast film of a lamellar-forming SBS (polystyrene-block-polybutadiene-block-polystyrene) triblock copolymer when cast from its toluene solution under a temperature gradient. In this study, we examined the influence of air stream on the pattern. It was found that sets of the concentric rings aligned approximately along the air stream. Further quantitative image analyses revealed that there appeared two correlation lengths in the distribution of centers of the concentric rings when the air stream was appropriately imposed, while the shorter correlation length only existed in the case of no (or weak) air stream. The shorter correlation length is almost identical to the distance between the nearest neighbor of the centers, whereas the longer one corresponds to the distance between two neighboring sets of centers which aligned approximately along the air stream. In order to discuss quantitatively the influence of the air stream on the alignment of centers, a two-dimensional orientation factor for a vector which connects two closely neighboring centers was evaluated with respect to the direction of the air stream. Its influence on the number average and the standard deviation of the magnitude of the vector is also discussed. It is concluded that the air stream can be another control factor, independent of a temperature gradient, for self-organization of the surface undulation of the cast film of the SBS triblock copolymer.

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  • 高分子論文集

    高分子論文集 56 (12), 814-820, 1999

    公益社団法人 高分子学会

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