STRUCTURAL AND DIELECTRIC INVESTIGATIONS OF A BINARY-SYSTEM OF A BI-SWALLOW-TAILED AND A TERMINALLY-POLAR COMPOUND

Induced smectic A phases in binary mixtures of a bi-swallow-tailed com ponent and a second component are described as 'filled smectic A phase s', since the second rod-like component is considered to occupy spaces between the terminal branches of the bi-swallow-tailed molecules. A n ew system of this kind is now described where the second rod-like comp onent has a terminal dipole, thereby enabling dielectric studies of th e mixtures. These measurements coupled with calorimetric and X-ray mea surements give information about the packing and dynamics of the mixed phases.