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Thermotropic liquid crystal multi-component copolyester and preparation method thereof

A technology of copolyester and thermotropism, which is applied in the direction of liquid crystal materials, chemical instruments and methods, etc., can solve the problems of equipment cost and reaction degree, and achieve the effect of more controllable reaction, high use temperature and high melting point

Inactive Publication Date: 2014-02-05
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the synthesis of general thermotropic liquid crystal copolyester needs to be reacted in a high temperature and high pressure environment, and the control of the cost of the equipment and the degree of reaction is a difficult point.

Method used

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  • Thermotropic liquid crystal multi-component copolyester and preparation method thereof
  • Thermotropic liquid crystal multi-component copolyester and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1: According to the molar ratio of polymer monomer terephthalic acid (TA), 1,4-diacetoxyphenylene (HQ-Ac) and 1,3-dibromopropane at 6:3:1, The formula of catalyst anhydrous zinc acetate 0.2wt% is first heated to 200°C at a heating rate of 10°C / min under the protection of nitrogen, reacted for 2 hours, and then heated to 280°C at a heating rate of 5°C / min with increased nitrogen flow rate °C for 4 hours, wherein the stirring speed was gradually increased during the reaction. After the reaction was completed, cool it out and wash it with acetone.

Embodiment 2

[0034] Example 2: According to the molar ratio of polymer monomer terephthalic acid (TA), 1,4-diacetoxyphenylene (HQ-Ac) and 1,3-dibromopropane at 5:4:1, The formula of catalyst anhydrous zinc acetate 0.2wt% is first heated to 200°C at a heating rate of 10°C / min under the protection of nitrogen, reacted for 2 hours, and then heated to 280°C at a heating rate of 5°C / min with increased nitrogen flow rate °C for 4 hours, wherein the stirring speed was gradually increased during the reaction. After the reaction was completed, cool it out and wash it with acetone.

Embodiment 3

[0035] Example 3: According to the molar ratio of polymer monomer terephthalic acid (TA), 1,4-diacetoxyphenylene (HQ-Ac) and 1,3-dibromopropane at 5:3:2, The formula of catalyst anhydrous zinc acetate 0.2wt% is first heated to 200°C at a heating rate of 10°C / min under the protection of nitrogen, reacted for 2 hours, and then heated to 280°C at a heating rate of 5°C / min with increased nitrogen flow rate °C for 4 hours, wherein the stirring speed was gradually increased during the reaction. After the reaction was completed, cool it out and wash it with acetone.

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Abstract

The invention relates to a thermotropic liquid crystal multi-component copolyester and a preparation method thereof. A novel thermotropic liquid crystal copolyester is synthesized from terephthalic acid, 1,4-diacetoxyl phenylene and phenol propane which is prepolymerized with hydroquinone and 1,3-dibromopropane as monomers at normal temperature and normal pressure by using a two-step method. The prepared product is the thermotropic liquid crystal copolyester with high properties, and has properties of high operating temperature and excellent machining properties. According to a synthesis method, polymerization by using the two-step method at high temperature and normal pressure is adopted, and the yield and the polymerization degree of the product are improved through low-temperature prepolymerization control. The method is low in synthesis reaction cost, the property of the product is excellent, and the reaction condition is simple and controllable.

Description

technical field [0001] The invention relates to a multi-component copolyester and a preparation method thereof. In particular, a thermotropic liquid crystal multi-component copolyester and a preparation method thereof. technical background [0002] Liquid crystal polymer is a new type of polymer material. Thermotropic liquid crystal polymer is a liquid crystal polymer emerging after lyotropic liquid crystal polymer. It has excellent comprehensive properties and can be processed by injection molding and extrusion. The main chain of the liquid crystal polymer molecule is very rigid, and the packing between the molecules is also very tight, forming a high degree of orientation during the molding process, so it has a small linear expansion coefficient, low molding shrinkage, very prominent strength, elastic modulus and Excellent heat resistance and other advantages, are widely used in electronics, electrical, optical fiber, automotive and aerospace and other fields. [0003] T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/00C08G63/66C09K19/38
Inventor 郭强钱君质张天骄毕宸洋林涛陈新新
Owner SHANGHAI UNIV