Influence of structure of two ring ester on the induction of smectic Ad Phase in bicomponent mixtures containing a compound with virtual Ad phase

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, NO 2 , NCS, COCH 3 , Cl or F, were studied by thermomicr...

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Bibliographic Details
Published in:Phase transitions 1997-04, Vol.60 (4), p.223-237
Main Authors: Gauza, S., Brodzik, M., Dabrowski, R., Przedmojski, J., Ważyńska, B.
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Equations of state, phase equilibria, and phase transitions
Exact sciences and technology
Liquid crystals
Phase diagrams
Phase induction
Physics
Smectic A
Specific phase transitions
Transitions in liquid crystals
X-ray
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Summary: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, NO 2 , NCS, COCH 3 , 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 A d phase together with the appearance of the nematic gap between A d and A 1 smectic phases and re-entrant nematic phase were observed in mixtures with high polar compounds (-CN, -NO 2 ). Complete miscibility together with an increase of smectic A phase persistence were observed in mixtures with medium polar compounds (-NCS, -COCH 3 ). Additive miscibility was observed in mixtures with low polar compounds (-Cl, F).
ISSN:0141-1594
1029-0338
DOI:10.1080/01411599708220058