Synthesis and Characterization of Main Chain Aromatic Liquid Crystal Copolyesters with X-Shaped and Rod-Shaped Mesogenic Units
writer：Z.F.Li, L.Li, S.Y.Zhang, S.J.Zheng,S. K. Cao and L
keywords：liquid crystal polymer; X-shaped and rod-shaped mesogenic units; Aromatic copolyesters; Sythensis and characterization.
source：期刊
A series of main chain liquid crystal aromatic copolyesters with X-shaped and rod-shaped mesogenic units were synthesized via solution condensation polymerizations of 4,4-(a,w-octanediolyloxy)-dibenzoyl dichlorides with 2,5-bis(p-octanoxy benzoyloxy)-hydroquinene and diphenol. All of the copolyesters showed thermotropic liquid crystalline behaviors through observations using DSC, polarized microscopy and X-ray diffraction. The melting point (Tm) and the isotropization temperature (Ti) change regularly with varying the content of dipheol unit in the copolymers.