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Liquid-crystal polyamide imide and preparation method therefor

A polyamide-imide and imide diacid technology, applied in the field of polymer compound preparation, can solve the problems of high imidization temperature, high dielectric constant, high moisture absorption rate, etc., and achieve less reaction by-products and high heat Effect of high decomposition temperature and high conversion rate

Inactive Publication Date: 2016-01-13
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although polyimide is widely used, it also has disadvantages such as insoluble and infusible, high imidization temperature, dark color, high moisture absorption rate and high dielectric constant.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (2) Weigh 3.384g (0.005mol) of imide diacid monomer, 0.5515g (0.0051mol) of p-phenylenediamine, NMP15mL, TPP4mL, pyridine 4mL, anhydrous CaCl 2 2g, LiCl 1g. Placed in a 100ml three-necked flask, refluxed with nitrogen gas, mechanically stirred, 80°C for 1h, 90°C for 1h, 100°C for 1h, 120°C for 5h. The reaction solution was settled with ethanol, filtered with suction and the filter residue was collected. Then rinse repeatedly with ethanol and warm water and vacuum dry.

[0033] Embodiment 1 synthesizes final product structural formula as shown in the following formula:

[0034]

[0035] n=10-200.

[0036] The intrinsic viscosity of the product was 1.2 dL / g.

[0037] Example 2

Embodiment 2

[0039] (2) Weigh 3.444g (0.005mol) of imide diacid monomer, 0.5515g (0.0051mol) of p-phenylenediamine, NMP13mL, TPP4mL, pyridine 4mL, anhydrous CaCl 2 2g, LiCl 1g. Placed in a 100ml three-necked flask, refluxed with nitrogen gas, mechanically stirred, 80°C for 1h, 90°C for 1h, 100°C for 1h, 120°C for 5h. The reaction solution was settled with methanol, filtered with suction and the filter residue was collected. Then rinse repeatedly with ethanol and warm water and vacuum dry.

[0040] Embodiment 2 synthesizes final product structural formula as shown in the following formula:

[0041]

[0042] The intrinsic viscosity of the product was 0.95 dL / g.

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Abstract

The invention discloses liquid-crystal polyamide imide and a preparation method therefor and belongs to the technical field of preparation of macromolecular compounds. The method comprises the steps: firstly, enabling aromatic tetracid dihydride and amino acid to be subjected to chemical imidization reaction, so as to produce an imide diacid monomer; and then, enabling the imide diacid monomer to be subjected to solution polymerization reaction with aromatic diamine, thereby producing the polyamide imide with high molecular weight. The liquid-crystal polyamide imide material provided by the invention has excellent tensile strength and good toughness and meanwhile has an excellent thermal property, thereby being capable of being extensively applied to industries such as electronic appliances, aeronautics & astronautics and national-defense military affairs.

Description

technical field [0001] The invention relates to a liquid crystal polyamide-imide and a preparation method thereof, belonging to the technical field of preparation of high molecular compounds. Background technique [0002] As we all know, polyimide (PI) is an aromatic heterocyclic polymer compound containing imide groups in the repeating unit. The rigid imide structure endows polyimide with unique properties, such as good mechanical properties and high temperature resistance. Performance, low temperature resistance, high strength and high modulus, dimensional stability, solvent resistance, etc., are widely used in aerospace, information recording and imaging technology, special engineering plastics and green energy and many other fields. Although polyimide is widely used, it also has disadvantages such as insolubility and infusibility, high imidization temperature, dark color, high moisture absorption rate and high dielectric constant. At present, there are two methods to im...

Claims

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Application Information

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IPC IPC(8): C08G73/14
Inventor 王标兵路广明曹梦
Owner CHANGZHOU UNIV
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