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Modulated differential scanning calorimetry

Transitions between monotropic and enantiotropic phases of a cholesteric liquid crystal

Journal of Thermal Analysis and Calorimetry
Authors: F. Roussel and J. M. Buisine

The Modulated Differential Calorimetry (MDSC) is applied to the determination of the reversibility in the cholesteryl chloride, which presents a cholesteric monotropic phase between the isotropic and crystalline states. The experimental modulation parameters that govern this method i.e. frequency, amplitude and heating/cooling rate, are determined. MDSC curves and complementary thermomicroscopical observations assign melting, crystallization and liquid cholesteric transition as ‘non reversing’, and clarification as ‘reversing’.

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