Calorimetric study of phase transitions in the liquid crystal butyloxybenzylidene octylaniline (4O.8)

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Abstract
The heat capacity of butyloxybenzylidene octylaniline has been measured from 0° to 95 °C. Significant pretransitional effects are observed near both the first-order transition from the normal rigid crystal to the B phase plastic crystal and the first-order melting transition from the B phase to the smectic-A liquid crystal phase. Data near the second-order smectic-A to nematic transition require a critical exponent α considerably greater than zero, in agreement with recent results on other materials