Polymer Micelles II. Aggregation Behavior of Hydrophobically Modified Polyethyleneglycol (C12E25) in Aqueous Solution.

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  • 高分子ミセルII  末端アルキル基修飾ポリエチレングリコール(C12E25)の水溶液中での会合挙動
  • マッタン アルキルキ シュウショク ポリエチレングリコール C12E25 ノ スイヨウエキ チュウ デ ノ カイゴウ キョドウ

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Abstract

Aggregation behavior of polyethyleneglycolmonododecylether (C12E25) in aqueous solution at 25°C was investigated by static and dynamic light scattering and viscoelastic measurements. C12E25 is found to form star-like sphere micelles with aggregation number Napp=26.0 (± 1.5) and the hydrodynamic radius Rh app=3.0 (±0.2) nm in dilute aqueous solution. Concentration dependencies of the storage modulus G″ and the loss modulus G″ demonstrate that, with increasing concentration, the solution changes drastically from a viscous liquid to a viscoelastic gel at about 30 wt% of C12E25. Some high order peaks in the X-Ray diffraction are observed for 40 wt% solution, suggesting that C12E25 gel exhibits long-range order structure with body-centered cubic lattice. It is concluded that star-like micelles of C12E25 in aqueous solution show a sol-gel transition at about 30 wt% to form an ordered structure as the concentration increases.

Journal

  • KOBUNSHI RONBUNSHU

    KOBUNSHI RONBUNSHU 58 (6), 286-291, 2001

    The Society of Polymer Science, Japan

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