Abstract
Abstract A binary liquid crystals system of cholesteryl oleyl carbonate and cholesteryl nonanoate (CN) has been studied using a differential scanning calorimeter. Measurements of the phase transition enthalpies, entropies, and heat capacities indicate that the smectic mesophase appears throughout the whole concentration ranges under cooling, but it only exists at room temperature with CN content of less than 50%. The phase diagram points out that the two components mixed well with ramdon distribution and formed a solid solution. Phase transition temperatures increase monotonically with the increase in CN content. This phenomenon has been interpreted from the viewpoint of molecular configuration. Mixtures have no eutectic point but the mesomorphous ranges of suitable compositions are still notably larger than those of pure components. The most suitable compositions and the most appropriate conditions for the cholesteric formations are also determined.
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