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Aromatic hyperbranched polyimide as well as preparation method and application thereof

A technology of polyimide and polyimide film, which is applied in the field of material science, can solve the problems of reduced heat resistance, large distance between chains, and restrictions on wide application, so as to improve heat resistance, low condition requirements, and good The effect of applying the foreground

Inactive Publication Date: 2019-01-08
HUNAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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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  • Aromatic hyperbranched polyimide as well as preparation method and application thereof
  • Aromatic hyperbranched polyimide as well as preparation method and application thereof
  • Aromatic hyperbranched polyimide as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 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 4,4" -diamino-5'-(4-aminophenyl)-[1,1':3',1″-terphenyl]-2'-ol 0.3674g (1mmol) dissolved in 40ml N,N-dimethylformamide The pressure dropping funnel is evenly added dropwise into the three-necked flask in 1-2 hours, then continue to react for 16 hours, then add 6ml of acetic anhydride and 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 , filtered, washed, repeated 2 to 3 times, and finally placed in a vacuum oven at 80°C for 24 hours to obtain a yellow-brown hyperbranched polyimide polymer, whose structural formula is as follows:

[0038]

Embodiment 2

[0040] Add 0.4515g (2.07mmol) of pyromellitic dianhydride (PMDA) and 15ml of N,N-dimethylacetamide into a three-necked flask, blow in argon, raise the temperature to 30°C, and add the triamine monomer 5,5 ',5″-(benzene-1,3,5-triyl)tris(thiophen-2-amine) 0.3695g (1mmol) was dissolved in 16ml of N,N-dimethylacetamide using a constant pressure dropping funnel at 1~ Add it dropwise into a three-necked flask evenly for 2 hours, then continue to react for 14 hours, then add 6.2ml of acetic anhydride and 2.1ml of triethylamine, heat up to 45°C and continue to react for 14 hours. Repeat 2 to 3 times, and finally place it in a vacuum drying oven at 80°C for 24 hours to obtain a light yellow hyperbranched polyimide polymer, whose structural formula is as follows:

[0041]

Embodiment 3

[0043]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 4,4″-diamino-5’-(4-aminophenyl)-[1,1’:3’,1″-terphenyl]-2’-thiol 0.3835g (1mmol) dissolved in 8ml N-formazan Pyrrolidone was evenly added dropwise into the three-necked flask with a constant pressure dropping funnel for 1 to 2 hours, then continued to react for 26 hours, then added 12ml of acetic anhydride and 3ml of triethylamine, raised the temperature to 45°C and continued to react for 18 hours. The material is in methanol, filtered, washed, repeated 2 to 3 times, and finally placed in a vacuum oven at 80°C for 24 hours to obtain a dark reddish-brown hyperbranched polyimide polymer, whose structural formula is as follows:

[0044]

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Abstract

The invention discloses aromatic hyperbranched polyimide as well as a preparation method and application thereof. The hyperbranched polyimide material is prepared from aromatic triamine and various types of tetracid dianhydride through imidization. The aromatic hyperbranched polyimide has a high glass-transition temperature and thermal stability, a low thermal expansion coefficient and excellent dissolubility. The synthesis method disclosed by the invention is simple and diverse in process and thus is applicable to industrial production. The hyperbranched polyimide disclosed by the invention has good application prospects in fields such as high-temperature resistance and materials such as gas permeation separation membranes.

Description

technical field [0001] The invention relates to the field of material science, in particular to an aromatic hyperbranched polyimide and a preparation method thereof. technical background [0002] 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 has been widely used in many high-tech fields due to its low dielectric properties, high mechanical properties, easy preparation, and especially high thermal stability. [0003] However, the high thermal stability of aromatic polyimides makes many polyimides poor in solubility. In order to improve the solubility and processing properties of aromatic polyimides, branched structures are introduced into polyimides to prepare Hyperbranched polyimides (HBPIs). Due to the advantages of both polyimide and hyperbranched polymer, hyperbranched polyimide has a seri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/10C08J5/18C08L79/08
CPCC08G73/1007C08G73/1067C08G73/1071C08G73/1078C08G73/1085C08J5/18C08J2379/08
Inventor 刘亦武谭井华唐傲花超然
Owner HUNAN UNIV OF TECH
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