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SYNTHESIS AND CHARACTERIZATION OF LIQUID CRYSTAL POLYESTERS WITH T-SHAPED TWO-DIMENSIONAL MESOGENIC UNITS() *

Zifa Li, Lei Li, Shu-yuan Zhany, Shi-jun Zheng, Shaokui Cao, Qifeng Zhou

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Abstract

A series of liquid crystalline polymers with T-shaped two-dimensional mesogenic unitswere synthesized via low temperature solution polycondensation of 2-(4'-alkoxy-phenyl)hydroquinone with various diacyl dichlorides. The polymers were found to be nematic andshown thermotropic liquid crystalline behaviors through observations using DSC, polarizedmicroscopy and X-ray diffraction. The melting temperature Tm and the isotropizationtemperature Ti of the polymers change regularly with varying of the monomer structures.

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A series of liquid crystalline polymers with T-shaped two-dimensional mesogenic unitswere synthesized via low temperature solution polycondensation of 2-(4'-alkoxy-phenyl)hydroquinone with various diacyl dichlorides. The polymers were found to be nematic andshown thermotropic liquid crystalline behaviors through observations using DSC, polarizedmicroscopy and X-ray diffraction. The melting temperature Tm and the isotropizationtemperature Ti of the polymers change regularly with varying of the monomer structures.

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Available abstract

A series of liquid crystalline polymers with T-shaped two-dimensional mesogenic unitswere synthesized via low temperature solution polycondensation of 2-(4'-alkoxy-phenyl)hydroquinone with various diacyl dichlorides. The polymers were found to be nematic andshown thermotropic liquid crystalline behaviors through observations using DSC, polarizedmicroscopy and X-ray diffraction. The melting temperature Tm and the isotropizationtemperature Ti of the polymers change regularly with varying of the monomer structures.

Key concepts: Mesogen, Thermotropic crystal, Liquid crystal, Polymer, Materials science, Monomer, Condensation polymer, Alkoxy group

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SYNTHESIS AND CHARACTERIZATION OF LIQUID CRYSTAL POLYESTERS WITH T-SHAPED TWO-DIMENSIONAL MESOGENIC UNITS() * — Research Paper | ScholarLens