SYNTHESIS AND CHARACTERIZATION OF MAIN CHAIN AROMATIC LIQUID CRYSTAL COPOLYESTERS WITH X-SHAPED AND ROD-SHAPED MESOGENIC UNITS*

LI Zifa; LI Lei; ZHANG Shuyuan; ZHENG Shijun; CAO Shaokui; ZHAO Liting; ZHOU Qifeng

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SYNTHESIS AND CHARACTERIZATION OF MAIN CHAIN AROMATIC LIQUID CRYSTAL COPOLYESTERS WITH X-SHAPED AND ROD-SHAPED MESOGENIC UNITS*

Papers | Updated：2021-06-21

- SYNTHESIS AND CHARACTERIZATION OF MAIN CHAIN AROMATIC LIQUID CRYSTAL COPOLYESTERS WITH X-SHAPED AND ROD-SHAPED MESOGENIC UNITS*
- Vol. 16, Issue 1, Pages: 48-55(1998)
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- Published：20 March 1998
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LI Zifa, LI Lei, ZHANG Shuyuan, et al. SYNTHESIS AND CHARACTERIZATION OF MAIN CHAIN AROMATIC LIQUID CRYSTAL COPOLYESTERS WITH X-SHAPED AND ROD-SHAPED MESOGENIC UNITS*[J]. 1998, 16(1): 48-55.
DOI：

LI Zifa, LI Lei, ZHANG Shuyuan, et al. SYNTHESIS AND CHARACTERIZATION OF MAIN CHAIN AROMATIC LIQUID CRYSTAL COPOLYESTERS WITH X-SHAPED AND ROD-SHAPED MESOGENIC UNITS*[J]. 1998, 16(1): 48-55. DOI：

摘要

A series of main chain liquid crystal aromatic copolyesters with X-shapedand rod-shaped mesogenic units were synthesized via solution condensation polymerizationsof 4

4'-(α

ω-octanedioyloxy)-dibenzoyl dichlorides with 2

5-bis(p-octanoxy benzoyloxy)-hydroquinone and diphenol. All of the copolyesters showed thermotropic liquid crystallinebehaviors 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 diphenol unit in the copolymers.

Abstract

A series of main chain liquid crystal aromatic copolyesters with X-shapedand rod-shaped mesogenic units were synthesized via solution condensation polymerizationsof 4

4'-(α

ω-octanedioyloxy)-dibenzoyl dichlorides with 2

5-bis(p-octanoxy benzoyloxy)-hydroquinone and diphenol. All of the copolyesters showed thermotropic liquid crystallinebehaviors 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 diphenol unit in the copolymers.

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