Abstract
The helical twisting power of poly(γ-benzyl L-glutamate) liquid crystals in mixed solvents has been examined as a function of the solvent composition and temperature. Dioxane, ethylene dichloride, m-cresol, and trifluoroacetic acid have been employed as solvents. The helical twisting power in the dioxane–ethylene dichloride system varies linearly with the solvent composition, while in the m-cresol–ethylene dichloride system, it varies as a quadratic function of the solvent composition. The addition of a small amount of trifluoroacetic acid (up to 6%) to the ethylene dichloride solution causes an increase in the helical twisting power. The solvent effect of m-cresol and trifluoroacetic acid has been discussed in terms of the intermolecular hydrogen-bond formation to the side-chain carbonyl ester groups and the disruption of aggregates of poly(γ-benzyl L-glutamate) α-helices.
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Toriumi, H., Minakuchi, S., Uematsu, Y. et al. Helical Twisting Power of Poly(γ-benzyl L-glutamate) Liquid Crystals in Mixed Solvents. Polym J 12, 431–437 (1980). https://doi.org/10.1295/polymj.12.431
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DOI: https://doi.org/10.1295/polymj.12.431