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Thermotropic liquid crystal block polyarylate as well as preparation and application thereof

A technology of thermotropic liquid crystal and polyarylate, applied in liquid crystal materials, chemical instruments and methods, etc., can solve the problems of high equipment requirements, inability to balance the operation method and product performance at the same time, and cumbersome reaction steps.

Active Publication Date: 2021-06-18
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a thermotropic liquid crystal block polyarylate and its preparation and application, to overcome the defects of the prior art that the reaction steps are cumbersome, the required equipment is high, and the operation method and product performance cannot be balanced at the same time

Method used

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  • Thermotropic liquid crystal block polyarylate as well as preparation and application thereof
  • Thermotropic liquid crystal block polyarylate as well as preparation and application thereof
  • Thermotropic liquid crystal block polyarylate as well as preparation and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0042]This example prepares thermotropic liquid crystal block polyarylate, the method is as follows: add 82.878g of p-hydroxybenzoic acid (I), 42.844g of 4,4'-dihydroxybenzophenone (II-I) into a 250ml three-neck round bottom flask respectively ), 16.613g terephthalic acid (Ⅲ), 21.619g 2,6-naphthalene dicarboxylic acid (Ⅳ). Then 173.553 g of acetic anhydride and 0.164 g of potassium acetate were added. The flask is equipped with a sealed metal paddle stirrer and a mechanical stirring device to control the stirring rate of the reaction mixture; one side is equipped with a nitrogen inlet pipe and a control valve to control the nitrogen flow rate according to the reaction process; the other side is equipped with an insulated distillation head. The nitrogen atmosphere was maintained, and the reaction mixture was kept in a quicksand bath at 150° C. for 35 minutes to carry out the acetylation reaction. Then the temperature was raised to 290°C at a rate of 0.6°C / min and kept warm. At...

Embodiment 2

[0045] This example prepares thermotropic liquid crystal block polyarylate, the method is as follows: add 41.439g of p-hydroxybenzoic acid (I) and 101.105g of 4,4'-dihydroxydiphenyl ether (II-II) into a 250ml three-neck round bottom flask respectively , 29.903g of terephthalic acid (III), 4.324g of 2,6-naphthalene dicarboxylic acid (IV). Then 132.717 g of acetic anhydride and 0.884 g of potassium acetate were added. The flask is equipped with a sealed metal paddle stirrer and a mechanical stirring device to control the stirring rate of the reaction mixture; one side is equipped with a nitrogen inlet pipe and a control valve to control the nitrogen flow rate according to the reaction process; the other side is equipped with an insulated distillation head. The nitrogen atmosphere was maintained, and the acetylation reaction of the reaction mixture was started at 130° C. in a quicksand bath, and the reaction time was 55 minutes. Then the temperature was raised to 310°C at a rate...

Embodiment 3

[0050] This example prepares thermotropic liquid crystal block polyarylate, the method is as follows: add 69.065g of hydroxybenzoic acid (I), 60.069g of bisphenol F (II-III), and 24.920g of terephthalic acid respectively in a 250ml three-neck round bottom flask (Ⅲ), 10.810 g of 2,6-naphthalene dicarboxylic acid (Ⅳ). Then 142.926 g of acetic anhydride and 0.330 g of potassium acetate were added. At the same time, the flask is equipped with a sealed metal paddle stirrer and related mechanical stirring devices to control the stirring rate of the reaction mixture; one side of the flask is equipped with a nitrogen inlet pipe and a control valve to control the nitrogen flow rate according to the reaction process; the other side is equipped with a thermal insulation distillation head . Maintaining a nitrogen atmosphere, the reaction mixture was acetylated in a quicksand bath for 50 min at a temperature of 140°C. Then, the temperature was raised to 300° C. at a rate of 1.1° C. / min, ...

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Abstract

The invention relates to thermotropic liquid crystal block polyarylate as well as preparation and application thereof. The polyarylate is shown as a general formula I. The single-component thermotropic liquid crystal block polyarylate is obtained by utilizing chemical activity difference control product combination of diphenol monomers, and has two glass transition temperatures. A high-temperature-resistant multi-shape memory material is prepared by utilizing a plurality of glass transition temperature, and is applied to the wider fields of aerospace, robots and the like.

Description

technical field [0001] The invention belongs to the field of thermotropic liquid crystal polyarylate and its preparation and application, in particular to a thermotropic liquid crystal block polyarylate and its preparation and application. Background technique [0002] Thermotropic liquid crystal polyarylates are a class of high-performance polymers, which have excellent properties such as high temperature resistance, corrosion resistance and high strength. Therefore, thermotropic liquid crystal polyarylate has been widely used in some special environmental conditions, such as engine control, aerospace and other fields. Block copolymers are special polymers that exhibit different properties than random copolymers or even mixtures of homopolymers. Thermotropic liquid crystal block polyarylate combines the common characteristics of thermotropic liquid crystal polyarylate and block copolymer. Although the existing thermotropic liquid crystal block polyarylates have excellent ...

Claims

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Application Information

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IPC IPC(8): C08G63/60C08G63/80C09K19/38
CPCC08G63/605C08G63/80C09K19/3809
Inventor 管清宝卢肖游正伟
Owner DONGHUA UNIV
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