Synthesis and mesomorphic properities of some ferroelectric liquid crystals of lactate

A semiperfluorinated chain has been introduced into three series of lactate -based molecules, and their mesomorphic properities have been studied by DS C and optical polarized microscope. An abnormal phenomenon has been found t hat the introduction of a triple bond in the core of the molecule, which le ngthened the molecule, gave rise to a decrease in the thermal stability of chiral smectic C phase and smectic A phase. 2, 3-Difluoro substituents of t he phenylenic structure hinder the formation of the chiral snectic C phase because of the steric effect.