New Phases in the Ferroelectric Liquid Crystal MHPOBC Studied by Differential Scanning Calorimetry

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Abstract
Phase transitions of L- and D-enantiomers of 4-(1-methylheptyloxycalbonyl)phenyl 4'-octyloxybiphenyl-4-carboxylate (MHPOBC) were studied by the DSC method. Two new phases have been observed between the smectic A phase and the smectic C * phase and between the smectic C * phase and the third stable state (S Y * phase) in both L- and D-MHPOBC. The new phases disappear by the introduction of more than 3% D-MHPODC into L-MHPOBC and vice versa. A phase diagram was constructed for the enantiometric mixture of L- and D-MHPOBC.