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Phase equilibria of rodlike molecules in binary solvent systems
Author(s) -
Nakajima Akio,
Hayashi Toshio,
Ohmori Minako
Publication year - 1968
Publication title -
biopolymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.556
H-Index - 125
eISSN - 1097-0282
pISSN - 0006-3525
DOI - 10.1002/bip.1968.360060708
Subject(s) - chemistry , isotropy , ternary operation , polymer , phase (matter) , thermodynamics , anisotropy , molecule , dimethylformamide , solvent , phase diagram , phase boundary , binary number , polymerization , organic chemistry , physics , arithmetic , mathematics , quantum mechanics , computer science , programming language
Phase relationships in solutions of rodlike, molecules were investigated with solutions of poly(γ‐benzyl L ‐glutamate) having degrees of polymerization of 1500 and 3600, in N , N ′‐dimethylformamide–methanol and in N , N ′‐dimethylformamide–water at 30°C. With these systems, corresponding boundary curves for isotropic and anisotropic solution were obtained as a function of composition. Phase diagrams for these ternary systems were analysed on the basis of a theoretical treatment by Flory for a binary system consisting of a rodlike polymer and a solvent and found to be in good agreement with that predicted theoretically. For example, the polymer concentration above which the isotropic phase cannot exist and that of anisotropic conjugate phase agree with the values calculated. Furthermore, viscosities were measured as a function of polymer concentration by the falling‐sphere method to confirm the boundary composition between the isotropic solution and heterogeneous region. These results were also found to coincide with those on phase equilibrium.