High-pressure DTA-investigations on liquid crystals |
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| Authors: | A. Bartelt J. Rubesamen G. M. Schneider |
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| Affiliation: | 1. BASF , Lacke + Farben AG, Münster-Hiltrup;2. Physical Chemistry Laboratory, Department of Chemistry , University of Bochum , D-4630, Bochum , 1 , Federal Republic of Germany |
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| Abstract: | Abstract High pressure studies on the phase behaviour of liquid crystals up to a maximum pressure of 7 kbar were performed using a computer-assisted high-pressure differential thermal analysis apparatus that has been developed for the present experiments. T (p) - phase diagrams were determined for selected liquid crystals differing systematically in structure. Data are presented for some phenylcyclohexanes, some bicyclo-hexanes and cyclohexylcarboxylic acid phenyl ester being substituted with different functional groups e.g. alkyl, alkoxy and/or cyano. Pressure-induced nematic and smectic phases were found, and for one substance even an “interdigitated” smectic B phase could be stabilized under pressure. |
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| Keywords: | high pressure T(p)-phase diagrams liquid crystals pressure - induced phases |
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