Supercritical Fluid in Polymer Science and Technology. I. Light Scattering Study of Poly (tert-butyl methacrylate)-block-Poly (1,1-dihydroperfluorooctyl methacrylate) in Liquid and Supercritical Carbon Dioxide. Towards the Reversible Control of Self-Assembly.

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  • YOSHIDA Eri
    Department of Chemistry, University of North Carolina at Chapel Hill Department of Polymer Science and Engineering, Kyoto Institute of Technology
  • WELLS Sharon L.
    Department of Chemistry, University of North Carolina at Chapel Hill
  • DESIMONE Joseph M.
    Department of Chemistry, University of North Carolina at Chapel Hill Department of Chemical Engineering, North Carolina State University

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Other Title
  • 超臨界流体と高分子　Ｉ　　液体および超臨界二酸化炭素中におけるポリ（ｔｅｒｔ‐ブチルメタクリレート）‐ｂｌｏｃｋ‐ポリ（１，１‐ジヒドロパーフルオロオクチルメタクリレート）ジブロック共重合体の光散乱解析　　自己組織化の可逆的制御をめざして
  • エキタイ オヨビ チョウリンカイ 2サンカタンソ チュウ ニ オケル ポリ tert ブチルメタクリレート block ポリ 1 1 ジヒドロパーフルオロオクチルメタクリレート ジブロック キョウジュウゴウタイ ノ ヒカリ サンラン カイセキ ジコ ソシキカ ノ カギャクテキ セイギョ オ メザシテ
  • Towards the Reversible Control of Self-Assembly
  • 自己組織化の可逆的制御をめざして

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Abstract

Self-assembly of CO2-soluble amphiphilic diblock copolymers consisting of poly (tert-butyl methacrylate) (P′ BMA) and poly (1, 1-dihydroperfluorooctyl methacrylate) (PFOMA) was studied in liquid and supercritical carbon dioxide. Dynamic light scattering studies demonstrated that the diblock copolymers, having a P′ BMA length greater than 4000, self-assembled into micelles with narrow molecular weight distributions. The copolymers having hydrodynamic radii of micelles between 13 and 21 nm exhibited a transition from micelles to unimers in the CO2 density range of 0.87-1.04 g/cm3. The exact transition density was dependent upon temperature and upon the length of the two polymer chains composing the diblock. This is the first light scattering study demonstrating that the micelles-to-unimers transition of block copolymers in CO2 is controlled through variation of the block length of the diblock copolymers. This suggests that it is possible to control the self-assembly of block copolymers not only by manipulating the solvent quality of the CO2 medium, but also by choice of the block length of the diblock copolymer.

Journal

  • KOBUNSHI RONBUNSHU

    KOBUNSHI RONBUNSHU 58 (10), 507-513, 2001

    The Society of Polymer Science, Japan

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