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We report experimental studies on optical (birefringence, $\Delta n$),dielectric $(\Delta \varepsilon)$ and bend-splay elastic anisotropies ($\DeltaK=K_{33}-K_{11})$ of a few mixtures of two nematic liquid crystals, namelyCCH-7 and CCN-47, made of highly polar molecules with identical cores andantagonistic orientation of permanent dipoles. In particular, the polar group(-CN) attached to the bicyclohexane core of CCH-7 is oriented along thelongitudinal direction whereas, in CCN-47, it is oriented along the transversedirection. We show that apart from the significant contribution to the opticaland dielectric anisotropies, the antagonistic orientation of strongly polargroups plays a crucial role in determining the bend-splay elastic anisotropy.The elastic properties are explained based on a model proposed by Priest,considering the effect of intermolecular association and the resultinglength-to-width ratio of the molecules.

Studies on binary mixtures of nematic liquid crystals made of strongly  polar molecules with identical cores and antagonistic orientation of  permanent dipoles