Effect of molecular structure on the phase behaviour of some liquid crystalline compounds and their mixtures VII. Ternary mixtures of enantiotropes

Transition temperatures of the ternary mixtures, prepared from compounds of the two series, 4-hexadecyloxyphenyl 4-substituted benzoates (Ia,b) and 4-substituted phenyl 4-hexadecyloxy benzoates (IIa,b) have been determined by differential scanning calorimetry and identified with polarized light microscopy. The cyano and nitro derivatives, in both series, were used because their molecules form enantiotropic phases. A new method was elaborated for the elucidation of the eutectic composition of any ternary system from the knowledge of the eutectic composition of the three individual binary mixtures.