Polarizabilities and Related Properties of Azo Benzene Liquid Crystal Compounds

Murthy, Y. Narashimha; Murthy, V. R. K.; Reddy, R. N. V. Ranga

doi:10.1002/crat.2170320211

Cited by 5 publications

(1 citation statement)

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“…While intensive studies concerning the optical behaviour of the single components constituting the three above cases (i), (ii), and (iii) have been recently presented [8][9][10][11][12][13], a little has been observed for binary mixtures [13][14][15][16]. This reflects the importance of presenting systematic investigations on the optical behaviour of binary mixtures especially at their eutectic composition.…”

Section: Introductionmentioning

confidence: 99%

Properties and Thermal Phase Behaviour of Binary Mixtures of Homologues of Unsymmetrically Substituted Phenyl Benzoates

2006

Egyptian Journal of Solids

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Sixteen liquid crystalline esters of the type 4-(n-C n H 2n+1 O)C 6 H 4-COOC 6 H 4 X-4 have been investigated for their thermal phase behaviour. These compounds constitute four homologous series that differ from each other by the substituent X. The latter varies between CH 3 O, CH 3 , CN, and NO 2. The number (n) of carbon varies, within a homologous series, between 6, 8, 14, and 16. All possible binary mixtures made from any two homologues that cover the whole composition range were prepared and characterized for their mesophase behaviour by differential scanning calorimetry (DSC) and polarizing light microscopy. Twenty four phase diagrams for the various binary combinations were constructed (i) to investigate the dependence of the phase behaviour of mixed systems upon differences in the length of the alkoxy group, (ii) to determine the eutectic composition, and its phase transitions, in each system. Each eutectic system of the binary mixtures (I6/In)X was investigated for its birefringence dependency on temperature via measurement of its refractive index as a function of temperature. The estimated orientational order parameter S for each system was used to examine the effect of the differences in chain length of alkoxy group on its optical properties.

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