Characterization of Anisotropic Mesophase of Cellulose Acetate in Inorganic Solvents Mixture

DOI Web Site 参考文献30件
  • Miyamoto Ikuya
    Fundamental Research Laboratory of Natural and Synthetic Polymers, Asahi Chemical Industry Co., Ltd.
  • Matsui Toshihiko
    Fundamental Research Laboratory of Natural and Synthetic Polymers, Asahi Chemical Industry Co., Ltd.
  • Saito Masatoshi
    Fundamental Research Laboratory of Natural and Synthetic Polymers, Asahi Chemical Industry Co., Ltd.
  • Kamide Kenji
    Faculty of Education, Kumamoto University

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タイトル別名
  • Characterization of Anisotropic Mesophase of Cellulose Acetate in Inorganic Solvent Mixture.
  • Characterization of Anisotropic Mesopha

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抄録

An attempt was made to determine phase diagram of cellulose acetates (CA) with total degree of substitution ⟨ ⟨F⟩ ⟩ ranging from 0.52 to 2.86, in a mixture of sulfuric acid (SA), poly(phosphoric acid) (PPA), and water (W). In the mixture with very specific composition of SA/PPA/W (=0.1/0.8/0.1, wt/wt/wt), in which cellulose has been reported to form liquid crystal by Kamide et al. [Polym. J., 25, 453 (1993)], all of the cellulose acetates showed anisotropic behavior. Circular dichroism (CD) spectra of the cellulose acetate mesophase indicated that the texture is left handed cholesteric irrespective of ⟨ ⟨F⟩ ⟩. The helicoidal cholesteric pitch (P) determined by the CD method remarkably depends on ⟨ ⟨F⟩ ⟩, polymer concentration (Cp) and temperature (T). The pitch monotonically increases with an increase of ⟨ ⟨F⟩ ⟩ at constant temperature and polymer concentration. The reciprocal pitch of all samples is proportional to T and Cp3. The coefficients of these relations indicated that the pitch of the sample with larger ⟨ ⟨F⟩ ⟩ tends to show less dependency on temperature and polymer concentration.

収録刊行物

  • Polymer Journal

    Polymer Journal 28 (11), 937-941, 1996

    The Society of Polymer Science, Japan

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