High Pressure Studies of the Phase Transition Enthalpies of the Liquid Crystal EBBA up to 2.5 kbar

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Abstract
The liquid crystal p-Ethoxy-benzylidee-p-n-butylaniline(EBBA) exhibits one nematic-liquid isotropic and two solid-nematic coexistence lines. With a high pressure micro calorimeter based on differential scanning calorimetry (DSC) previously described the phase transition enthalpies of these three phase transitions have been measured in the pressure range 1 bar to 2.5 kbar. Numerical data are presented for the transition temperatures, the enthalpy changes, the entropy changes, and the volume changes for both solid-nematic transitions as well as for the nematic-liquid isotropic transition. Additionally the effect of impurities on the nematic-liquid isotropic transition enthalpy at normal pressure is discussed.