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Abstract
Mixtures of 4-cyano-4′-hydroxyazobenzene 4-n-octyloxybenzoate (8OBCAB) - constant compound and 4′-X-phenyl 4-n-decylbenzoate or 4′-X-phenyl 4-n-decyloxybenzoate (10.X, 10.O.X) - the variable compound in which X refers to the terminal group CN, NO2, NCS, COCH3, Cl or F, were studied by thermomicroscopic and X-ray methods. The influence of the terminal groups on the kind of phases and their miscibility was observed. The enhancement of the smectic Ad phase together with the appearance of the nematic gap between Ad and A1 smectic phases and re-entrant nematic phase were observed in mixtures with high polar compounds (-CN, -NO2). Complete miscibility together with an increase of smectic A phase persistence were observed in mixtures with medium polar compounds (-NCS, -COCH3). Additive miscibility was observed in mixtures with low polar compounds (-Cl, F).