Abstract
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.
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Miyamoto, I., Matsui, T., Saito, M. et al. Characterization of Anisotropic Mesophase of Cellulose Acetate in Inorganic Solvent Mixture. Polym J 28, 937–941 (1996). https://doi.org/10.1295/polymj.28.937
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DOI: https://doi.org/10.1295/polymj.28.937