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1 January 1998 Twist grain boundary phase states in ester polymorphic liquid crystalline systems
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Abstract
Phase states of liquid crystalline (LC) systems consisting of non-chiral smectogenic ester and structurally similar smectogenic chiral dopant, N-[4-(4-n- nonylphenyl)benzoyloxy]benzylidene S-1-benzylethylamine, have been studied. In all investigated LC systems, the twist grain boundary smectic A (TGBA) and smectic C (TGBC) phase occur between the cholesteric and SmA phases and between the cholesteric and SmC* phases, respectively. The effect of matrix smectogenity on the TGB phase regions has been established. For the chosen LC system with varying ratio of the optically active and racemic forms of the dopant at a constant total concentration, the experimental dependencies of TGBC and TGBA phase temperature ranges on a cholesteric helical twist have been obtained. The experimental results are interpreted within Renn's model.
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Viktor I. Kulishov, Nonna L. Kramarenko, Lidiya A. Kutulya, Natalya I. Shkolnikova, and A. S. Tolochko "Twist grain boundary phase states in ester polymorphic liquid crystalline systems", Proc. SPIE 3319, Liquid Crystals: Chemistry and Structure, (1 January 1998); https://doi.org/10.1117/12.301280
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