THE STRUCTURE OF MESOPHASES OF BINARY AND MULTICOMPONENT MIXTURES OF SOME CHOLESTERIC LIQUID-CRYSTALS

We present the results of the study of binary and multicomponent mixtu res of cholesteryl enanthate with cholesteryl nonanoate and cholestery l formiate. The aim of the study is the preparation of the system with phase transition temperature close to room temperature. Phase diagram s of binary mixtures are formed on the basis of data obtained by the o ptical microscopy and DS calorimetry and the shift of phase transition points of order 30 - 50 degrees with respect to initial components wa s established. In the case of three- and four-component mixtures, we h ave identified the presence of enantiomorphic phase transitions of sme ctic and cholesteric type respectively. X-ray diffraction data have en abled the characterization of the structure of smectic or cholesteric mesophase and the calculation of molecular parameters: apparent length of the molecules l and the average intermolecular distance (D).