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BY-NC-ND 3.0 license Open Access Published by De Gruyter June 2, 2014

Pressure-Temperature Phase Diagrams for four 4,4'-Dialkylbiphenyl Compounds

Stanisław Urban EMAIL logo , Maria Massalska-Arodź , Albert Würflinger and Krzysztof Czupryński

Cm-Cn

The high pressure phase behaviour of four 4,4'-dialkylbiphenyl compounds (, m = 5, 6,7, n = 6, 7) has been studied with differential thermal analysis. The pressure dependence of the phase transitions has been determined up to 200 MPa. In one substance a pressure limited and in another a pressure induced phase was observed. Volume changes accompanying the transitions to the isotropic phase were calculated using the Clausius-Clapeyron equation and the enthalpy changes from DSC measurements at 1 atm. They are compared with the data for other two-ring compounds.

Received: 2002-4-2
Published Online: 2014-6-2
Published in Print: 2002-8-1

© 1946 – 2014: Verlag der Zeitschrift für Naturforschung

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

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