Abstract: The phase states of thermotropic liquid crystalline polymers (LCPs) cooled from isotropic melt were analyzed on the basis of thermodynamics and kineticsThe thermal entropy scheme of LCPs on heating and cooling was establishedAnd a new method for judging the phase states of LCPs was proposedThe method was applied to a series of polyesters, and the phase states of the polyesters cooled from isotropic melt were obtained.

Key words: Thermotropic liquid crystals, Polyesters, Phase state, Liquid crystalline glass, Phase transition function