Study of cholesteryl formate and cholesteryl octanoate by means of thermal analytic microscopy with a thermoelement.

概要

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A simple apparatus using a thermoelement was constructed for thermal analytic microscopy and the phase transitions of cholesteryl formate and cholesteryl octanoate were studied. The isotropic-cholesteric transition of cholesteryl formate and the cholesteric-smectic transition of cholesteryl octanoate were observed microscopically but not thermally. Upon slow cooling cholesteryl octanoate gives large spherulites with a cholesteric focal conic texture. The spherulites are optically negative. They give rise to the vortices which turn to smectic reeled yarns in specimens with appropriate thickness. The solar spectrum which appears at the cholesteric-smectic transition of cholesteryl octanoate was observed repeatedly, namely, blue, yellow, red, blue, <I>etc</I>. A melt recrystallized sample of cholesteryl formate forms a block similar to a sphere in the thermal cell. Both solid phases of cholesteryl formate and octanoate grow radially in the microscopic cell plates.
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