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Liquid crystal polymer, preparation method thereof and liquid crystal polymer film

A liquid crystal polymer, polycondensation reaction technology, applied in liquid crystal materials, chemical instruments and methods, etc., can solve the huge difference in mechanical properties of liquid crystal polymer films, the difference in mechanical properties of molded products or films, and the low tensile strength of liquid crystal polymers. and other problems, to achieve good batch stability, excellent mechanical properties, and good batch stability.

Active Publication Date: 2021-10-22
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This anisotropy leads to serious differences in the mechanical properties of molded products or films, poor batch stability, etc., especially for films obtained by conventional blow molding methods, the film mechanical loading direction (Machine Direction, MD) and perpendicular to The mechanical properties (mainly referring to the mechanical strength) of the mechanical loading direction (Transverse Direction, TD) vary greatly, which makes it unable to meet the use requirements in practical applications
[0004] Patent application No. 200380106646.8 discloses a liquid crystal polymer composition. Although the thermal stability is high, the melting point of this liquid crystal polymer exceeds 400°C, which leads to an excessively high processing temperature of the liquid crystal polymer. At the same time, it is processed by conventional blow molding equipment, and the mechanical properties of the MD and TD directions of the liquid crystal polymer film are very different.
The patent application with the application number 202010411738.2 proposes that although the anisotropy and welding strength of the liquid crystal polymer are improved by blending the carbodiimide / amino group-containing compound in the liquid crystal polymer and the cyclic olefin resin, the liquid crystal polymer lower tensile strength

Method used

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  • Liquid crystal polymer, preparation method thereof and liquid crystal polymer film
  • Liquid crystal polymer, preparation method thereof and liquid crystal polymer film
  • Liquid crystal polymer, preparation method thereof and liquid crystal polymer film

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preparation example Construction

[0055] The present invention also provides a preparation method of the liquid crystal polymer described in the above technical solution comprising the following steps:

[0056] a) monomer I', monomer II', monomer III' and an acetylating agent are mixed for acetylation reaction to obtain an acetylated product;

[0057] b) the acetylated product undergoes a polycondensation reaction to form a liquid crystal polymer;

[0058]

[0059] in:

[0060] R 1 for C n h 2n , n is 1~6;

[0061] R 2 for C m h 2m , m is 1~6;

[0062] Regarding step a):

[0063] In the present invention, the structures of monomer I' (i.e. dihydric alcohol containing anthracene group), monomer II' (i.e. dibasic alkyl carboxylic acid containing anthracene group) and monomer III' (i.e. p-hydroxybenzoic acid) As shown above. Among them, in monomer Ⅱ', R 1 for C n h 2n , n is 1 to 6, preferably 2 to 5, and in some embodiments of the present invention, n is 2; R 2 for C m h 2m , m is 1-6, prefer...

Embodiment 1

[0082] S1. Mix 2mol of monomer I' and 5mol of monomer II' (R 1 for C 2 h 2 , R 2 for C 2 h 2 ), 3mol of monomer III' was added to the reaction vessel with a stirring paddle, and then 11mol of acetic anhydride was added to the reaction vessel as an acetylating agent. The reaction vessel was evacuated and argon was repeatedly operated for more than 5 times, so that the reaction mixture was protected by an inert gas, and then the temperature was raised to 150° C., and the acetylation reaction was carried out under stirring conditions for 4 hours.

[0083] S2. After the acetylation reaction in step S1 is completed, a small flow rate of argon gas is introduced into the reaction vessel, and the by-product acetic acid and excess acetic anhydride vapor are taken out of the reaction vessel under the action of 15 mL / min air flow.

[0084] S3. Raise the temperature of the reaction vessel to 360° C. to cause the reaction mixture to undergo a solid-phase melting condensation reaction....

Embodiment 2

[0090] S1, 3mol monomer Ⅰ', 4mol monomer Ⅱ'(R 1 for C 2h 2 , R 2 for C 2 h 2 ), 3mol of monomer III' was added to the reaction vessel with a stirring paddle, and then 11mol of acetic anhydride was added to the reaction vessel as an acetylating agent. The reaction vessel was evacuated and argon was repeatedly operated for more than 5 times, so that the reaction mixture was protected by an inert gas, and then the temperature was raised to 150° C., and the acetylation reaction was carried out under stirring conditions for 4 hours.

[0091] S2. After the acetylation reaction in step S1 is completed, a small flow rate of argon gas is introduced into the reaction vessel, and the by-product acetic acid and excess acetic anhydride vapor are taken out of the reaction vessel under the action of 15 mL / min air flow.

[0092] S3. Raise the temperature of the reaction vessel to 360° C. to cause the reaction mixture to undergo a solid-phase melting condensation reaction. After 6 hours, ...

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Abstract

The invention provides a liquid crystal polymer, a preparation method thereof and a liquid crystal polymer film. The liquid crystal polymer provided by the invention comprises three repetitive units as shown in formulas I-III, anthryl is introduced into a liquid crystal polymer structure, and meanwhile, a flexible chain structure is introduced to a part of anthracene rings and is matched with a phenyl structure; the design can break the regularity of the main chain structure of the liquid crystal polymer, reduce the forming temperature of the liquid crystal polymer in the processing process, and solve the problems of serious mechanical property differentiation, poor batch stability and the like of the formed product without influencing other performance indexes.

Description

technical field [0001] The invention relates to the field of organic materials, in particular to a liquid crystal polymer, a preparation method thereof, and a liquid crystal polymer film. Background technique [0002] Liquid crystal polymer (Liquid Crystal Polymer, LCP) is a kind of ester polymer with rigid polymer chain segment. In view of the particularity of the overall molecular structure, LCP has the characteristics of extremely low moisture absorption, low dielectric loss, chemical corrosion resistance, heat resistance, weather resistance and flame retardancy. Due to these characteristics of LCP, it has important applications in the fields of electrical / electronics, medical materials, and aerospace. [0003] However, the main chain of LCP molecules is very rigid, and at the same time, the strong interaction between molecules makes them packed tightly, which makes liquid crystal polymers have a high processing temperature and requires high processing equipment, which i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/60C08G63/78C08J5/18C08L67/00C09K19/38
CPCC08G63/605C08G63/78C08J5/18C09K19/3809C08G2250/00C08J2367/00
Inventor 邹佳伟王明哲班雨栾世方石恒冲杨华伟
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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