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A kind of high heat-resistant hyperbranched polyimide and its preparation method and application

A polyimide and thermal imidization technology, applied in the field of material science, can solve the problems of limited wide application, large inter-chain distance, decreased heat resistance, etc., achieve good application prospects, improve heat resistance, increase heat resistance, etc. The effect of a large free volume

Active Publication Date: 2021-03-23
江西有泽新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Compared with linear polyimide materials, the distance between hyperbranched polyimide molecular chains is large, which improves its solubility, but its heat resistance is relatively reduced, which limits its application in aerospace, aerospace vehicle structures or functional parts and Wide application in the fields of parts and components of rockets and missiles

Method used

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  • A kind of high heat-resistant hyperbranched polyimide and its preparation method and application
  • A kind of high heat-resistant hyperbranched polyimide and its preparation method and application
  • A kind of high heat-resistant hyperbranched polyimide and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Add 0.4362g (2mmol) of pyromellitic dianhydride (PMDA) and 36ml of N,N-dimethylformamide into a three-necked flask, blow in argon, raise the temperature to 30°C, and add the triamine monomer N 4 ,N 4 -bis(4-aminophenyl)-[1,1'-biphenyl]-4,4'-diamine 0.3665g (1mmol) dissolved in 40ml N,N-dimethylformamide with constant pressure dropping funnel in 1~2h Evenly drop into a three-necked flask, then continue to react for 12 hours, then add 6ml of acetic anhydride and 2ml of triethylamine, heat up to 45°C and continue to react for 10 hours, after the reaction is completed, cool to room temperature and discharge in methanol, filter, wash, repeat 2~ 3 times, and finally placed in a vacuum drying oven at 80°C for 24 hours to obtain a yellow hyperbranched polyimide polymer, whose structural formula is as follows:

[0039]

Embodiment 2

[0041] Add 0.903g (4.14mmol) of pyromellitic dianhydride (PMDA) and 3ml of N,N-dimethylacetamide into a three-necked flask, blow in argon, raise the temperature to 30°C, and add the triamine monomer N 3 ,N 3 -bis(4-aminophenyl)-[1,1'-biphenyl]-3,4'-diamine 0.733g (2mmol) dissolved in 2ml N,N-dimethylacetamide with constant pressure dropping funnel in 1~2h Evenly drop into the three-necked flask, then continue to react for 15 hours, then add 12.4ml of acetic anhydride and 4.2ml of triethylamine, heat up to 45°C and continue to react for 12 hours, after the reaction is completed, cool to room temperature and discharge in ethanol, filter, wash, repeat 2 to 3 times, and finally placed in a vacuum drying oven at 80°C for 24 hours to obtain a brown hyperbranched polyimide polymer, whose structural formula is as follows:

[0042]

Embodiment 3

[0044] Add 0.4413g (1.5mmol) of 3,3',4,4'--biphenyltetracarboxylic dianhydride (BPDA) and 10ml of N-methylpyrrolidone into a three-necked flask, pass in argon, raise the temperature to 30°C, and Triamine Monomer N 2 ,N 2-bis(4-aminophenyl)-[1,1'-biphenyl]-2,4'-diamine 0.3665g (1mmol) dissolved in 8ml of N-methylpyrrolidone using a constant pressure dropping funnel in 1 ~ 2h evenly drop into three In the flask, continue to react for 24 hours, then add 12ml of acetic anhydride and 3ml of triethylamine, heat up to 45°C and continue to react for 10h, after the reaction is completed and cooled to room temperature, discharge the material in methanol, filter, wash, repeat 2 to 3 times, and finally Place it in a vacuum oven at 80°C and dry it for 24 hours to obtain a brown hyperbranched polyimide polymer, which has the following structural formula:

[0045]

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Abstract

The invention discloses a high-heat-resistance hyperbranched polyimide, and a preparation method and application thereof. The hyperbranched polyimide is produced by imidization by using aromatic triamines and various tetracarboxylic dianhydrides as raw materials. The hyperbranched polyimide has high glass transition temperature and thermal stability, a low coefficient of thermal expansion and excellent solubility. The synthesis method of the hyperbranched polyimide is simple and diverse and is therefore suitable for industrial production. The hyperbranched polyimide disclosed by the inventionhas good application prospects in the fields of high-temperature resistance and gas permeation separation membranes.

Description

technical field [0001] The invention relates to the field of material science, in particular to a high heat-resistant hyperbranched polyimide and its preparation method and application. [0002] technical background [0003] Polyimide refers to a class of polymers containing imide rings on the main chain. According to the different molecular structures, it can be divided into aromatic polyimide and aliphatic polyimide. Among them, aromatic polyimide is known for its low dielectric properties, high mechanical properties, easy preparation, and especially high thermal stability; however, its solubility and processability are poor. [0004] In recent years, researchers have introduced branched structures into polyimides to prepare hyperbranched polyimides (HBPIs) to improve the solubility and processability of aromatic polyimides. Hyperbranched polyimide combines the advantages of both polyimide and hyperbranched polymer and has a series of excellent comprehensive properties, s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G73/10C08J5/18C08L79/08
CPCC08G73/1003C08G73/1039C08G73/1064C08G73/1067C08J5/18C08J2379/08
Inventor 谭井华刘亦武黄杰彭思梅吴鼎
Owner 江西有泽新材料科技有限公司
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