Textures in Concentrated Solutions of Poly (<SUB>L</SUB>-glutamic acid) and Poly (oxyethylene glycol) and in the Solid Films

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  • MORI Tetsuo
    Department of Materials Science and Technology, Faculty of Engineering, Kyushu University
  • YAMADA Tetsuro
    Department of Materials Science and Technology, Faculty of Engineering, Kyushu University
  • TANAKA Ryuichi
    Department of Materials Science and Technology, Faculty of Engineering, Kyushu University
  • TANAKA Takehide
    Sasebo Technical College

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Other Title
  • ヘテロ網目高分子　ＩＸ　　ポリ（Ｌ‐グルタミン酸）とポリ（オキシエチレングリコール）の濃厚溶液および固体膜の高次組織
  • ポリ L グルタミンサン ト ポリ オキシエチレン グリコール ノ ノウコウ

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Abstract

Concentrated solutions of poly (L-glutamic acid) (PGA) and poly (oxyethylene glycol) (PEG, Mn=300), and the solid films prepared by casting them were investigated by means of small-angle light scattering and polarizing microscopy. N, N-dimethylformamide (DMF) and dioxane-water mixtures (D-W, 3: 1 v/v) were used as solvents. In all the concentrated solutions, irrespective of the relative content of PGA and PEG, the cholesteric liquid crystal structure was observed both in DMF and in D-W. Concerning the solid films prepared by evaporating DMF, two different states of aggregation were recognized depending on the PGA content. The films with a PGA content of 100 or 90 wt% gave rise to the HV pattern typified by the 0-90° cross (+ type); their polarizing micrographs showed aggregates of rodlike texture. The HV patterns changed to the ±45° cross (×-type) with the films containing 80-40 wt% of PGA and the micrographs typical of cholesteric liquid crystal structure were obtained. All the films cast from D-W, on the other hand, showed ×-type HV patterns. Spherulitic cholesteric structure and/or the retardation lines were observed.

Journal

  • KOBUNSHI RONBUNSHU

    KOBUNSHI RONBUNSHU 36 (3), 183-187, 1979

    The Society of Polymer Science, Japan

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