摘要
A semiperfluorinated chain has been introduced into three series of lactate-based molecules, and their mesomorphic properities have been studied by DSC and optical polarized microscope. An abnormal phenomenon has been found that the introduction of a triple bond in the core of the molecule, which lengthened 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 the phenylenic structure hinder the formation of the chiral snectic C phase because of the steric effect.
A semiperfluorinated chain has been introduced into three series of lactate-based molecules, and their mesomorphic properities have been studied by DSC and optical polarized microscope. An abnormal phenomenon has been found that the introduction of a triple bond in the core of the molecule, which lengthened 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 the phenylenic structure hinder the formation of the chiral snectic C phase because of the steric effect.
基金
Project supported by the National Natural Science Foundation of China
