Destruction of an Intercalated Structure in a Smectic A Phase

Abstract

The destruction of the intercalated smectic A structure of a laterally bulky branched 1,4-phenylen dibenzoate A by addition of a rodlike cinnamate B was studied by the phase diagram as well as by calorimetric. x-ray and dielectric measurements. The thermal stability of the S, phase of compound A and its phase transition enthalpy decrease with increasing concentration of B. Furthermore, the destruction of the short range order of A is characterized by increasing layer distances, decreasing dipolar correlation and an increasing dielectric relaxation frequency only of component A.

Synthesis and Liquid Crystalline Studies of 2,4-bis(4'-n-nonyloxybenzoyloxy)benzylidene-4''-n-alkoxyaniline

“…Berdague, et al (1993) reported new laterally aromatic branched liquid crystal (LC) materials with the N and S m C phases. In another study done by Haddawi, et al (1994) about the lateral aryl substituents, the synthesized compound shows the N and S m A phases. Aziz (2000) synthesize some new Schiff-base-diester compounds, during this study, the mesomorphic behavior of the Schiff-base compounds shows the N, S m C, and S m I mesophases ( Fig.…”