Abstract
Thermally induced inversion of the cholesteric sense has been found in lyotropic polypeptide liquid crystals. The cholesteric sense of poly(γ-benzyl L-glutamate) liquid crystal in m-cresol (17 vol%) inverts from right to left at 60°C, and the reciprocal of the cholesteric pitch changes linearly with temperature. The compensated liquid crystalline solution at 60°C shows no helical twist. Similar phenomena are found for poly(γ-benzyl L-glutamate) in benzyl alcohol and for poly(γ-propyl L-glutamate) in m-cresol. The solvent effect on the helical twisting power is discussed in the light of the fact that the side-chain ester groups of poly(γ-benzyl L-glutamate) form hydrogen bonds with the hydroxyl groups of m-cresol.
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Toriumi, H., Kusumi, Y., Uematsu, I. et al. Thermally Induced Inversion of the Cholesteric Sense in Lyotropic Polypeptide Liquid Crystals. Polym J 11, 863–869 (1979). https://doi.org/10.1295/polymj.11.863
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DOI: https://doi.org/10.1295/polymj.11.863