Abstract
Abstract The enthalpy relaxation process of the glassy state of the new liquid crystalline compound, cholesteryl 4-n-alkoxy-3-methoxybenzoate (I), was studied by differential scanning calorimetry (DSC). The excess enthalpy was calculated from DSC curves of the annealed samples. Assuming the total excess enthalpy, ΔH o of quenched sample could be calculated by the equation, ΔH o = ΔCp (T g - T a), where ΔCP is the heat capacity difference between the liquid state and the glassy state at the glass transition temperature (T g) and T a is the annealing temperature. From the change of the excess enthalpy with the annealing time, the relaxation time was obtained. The relaxation times of three homologues were calculated in order to compare the relaxation rate. The effect of the structure of the compounds on the relaxation process was found, i.e., the relaxation time increases with the increase of the chain length of the n-alkoxyl group.
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