Two new cholesteric liquid crystal materials, Cholesteryl 3-(2-chloroethoxy) propionate and Cholesteryl 3-(2-(N,N-dimethylamino)ethoxy)propionate(DAEP-Chol)have been prepared. The thermal behavior of these cholesteric liquid crystals have been studied by means of differential scanning calorimetry and polarizing microscopy.
In order to construct an electro-responsive cholesteric system, the ionic derivatives of DAEP-Chol have been prepared and their properties were examined.
The ionic derivatives; 2-(2-Cholesteryloxycarbonylethoxy) ethyltrimethylammonium iodide, 2-(2-Cholesteryloxycarbonylethoxy)ethyldimethylammoniopropanesulfonate(CEDAP) and 2-(2-Cholesteryloxycarbonylethoxy)ethyldimethylammonioacetate were found to exhibit no cholesteric liquid crystal phases. And attempts were made to cocrystallize them with other non-ionic cholesteric liquid crystals. Cocrystallization also has been investigated by means of differential scanning calorimetry and polarizing microscopy.
Among the ionic derivatives, CEDAP completely cocrystallized with DAEP-Chol, and the others partially cocrystallized.
