Heat Capacity and Enthalpy of Transition of Aromatic Liquid Crystals

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Abstract
Adiabatic calorimetry was applied to some liquid crystalline substances. Especial reference is made for the first time to the transition between smectic modifications of different types. The enthalpy of transition, including pre-and post-transition effects, is 2100 joules/mole for the smectic B to smectic A transition of ethyl p-(4-ethoxybenzylideneamino-)cinnamate, and only 100 joules/mole for the smectic C to smectic A transition of di-n-dodecyl 4,4′-azoxy-α-methylcinnamate.

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