Thermodynamics of Two Compounds of Chiral Non-Symmetric Dimesogens Under Pressure

Abstract

High pressure experiments have been performed by thermobarometric analysis on two compounds of chiral non-symmetric dimesogens, which both exhibit the and S_A mesophases. The pressure-temperature phase diagrams were determined. Molar volume changes for all phase transitions, and the pressure coefficients at constant volume- of the phases were also deduced from the recorded thermobarograms. The thermobarometric analysis allows us to easily separate the entropy of the phase transition into a configurational part and a part dependent on volume.