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A kind of hyperbranched polyimide containing carbazole structure and its preparation method and application

A technology of polyimide and polyimide film, which is applied in the field of material science, can solve the problems that new hyperbranched polyimide has not been reported, and achieve high glass transition temperature, thermal stability and low thermal expansion coefficient , Various effects of preparation process

Active Publication Date: 2018-03-30
HUNAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, hyperbranched polyimides with special functions of various structures emerge in an endless stream, but no new hyperbranched polyimides containing carbazole structures have been reported so far.

Method used

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  • A kind of hyperbranched polyimide containing carbazole structure and its preparation method and application
  • A kind of hyperbranched polyimide containing carbazole structure and its preparation method and application
  • A kind of hyperbranched polyimide containing carbazole structure and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 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 dissolve the triamine monomer 9-(3 -aminophenyl)-9H-carbazole-3,6-diamine0.2883g (1mmol) was dissolved in 40ml of N,N-dimethylformamide and added dropwise into the three-necked flask with a constant pressure dropping funnel in 1~2h, and then continued to react for 12h , then add 6ml of acetic anhydride and 2ml of triethylamine, raise the temperature to 45°C and continue the reaction for 12h, after the reaction is completed and cool to room temperature, discharge the material in ethanol, filter, wash, repeat 2 to 3 times, and finally place in a vacuum oven at 80°C Dry 24h in middle, obtain dark reddish-brown hyperbranched polyimide polymer, its structural formula is as follows:

[0028]

Embodiment 2

[0030] Add 0.4515g (2.07mmol) of pyromellitic dimethyl anhydride (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 N 1 -(4-(3-amino-9H-carbazol-9-yl)phenyl)-N 1 -(4-aminophenyl)benzene-1,4-diamine 0.4556g (1mmol) dissolved in 16ml of N,N-dimethylacetamide was evenly added dropwise into the three-necked flask with a constant pressure dropping funnel for 1-2 hours, and then continued the reaction 18h, then add 6.2ml acetic anhydride and 2.1ml triethylamine, raise the temperature to 45°C and continue the reaction for 16h, after the reaction is completed, cool to room temperature and discharge in ethanol, filter, wash, repeat 2-3 times, and finally place at 80°C Dry 24h in vacuum oven, obtain brown hyperbranched polyimide polymer, its structural formula is as follows:

[0031]

Embodiment 3

[0033] Add 0.4413g (1.5mmol) of 3,3',4,4'-biphenyltetracarboxylic dianhydride (BPDA) and 10ml of N-methylpyrrolidone into a three-necked flask, blow in argon, raise the temperature to 30°C, and put the three Amine monomer N 1 -(4-aminophenyl)-N 1-(4-(3-(4-aminophenyl)-9H-carbazol-9-yl)phenyl)benzene-1,4-diamine 0.5317g (1mmol) was dissolved in 8ml N-methylpyrrolidone with constant pressure dropping funnel 1~2h, evenly drop into the three-necked flask, then continue to react for 24h, then add 12ml of acetic anhydride and 3ml of triethylamine, heat up to 45°C and continue to react for 12h, after the reaction is completed, cool to room temperature and discharge in methanol, filter, wash, 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:

[0034]

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Abstract

The invention discloses novel hyperbranched polyimide containing a carbazole structure, and a preparation method and application of the novel hyperbranched polyimide. The novel hyperbranched polyimide is prepared by taking triamine containing the carbazole structure and all kinds of tetracid dianhydride as raw materials through imidization. The novel hyperbranched polyimide disclosed by the invention has higher glass-transition temperature, higher thermal stability, better optical performance and good solubility. A synthetic method disclosed by the invention is simple in technology and diversified, so that the synthetic method is suitable for industrial production. The novel hyperbranched polyimide disclosed by the invention has a better application prospect in the fields of photosensitization, optical waveguide, gas permeation and separation membranes and the like.

Description

technical field [0001] The invention relates to the field of material science, in particular to a hyperbranched polyimide containing a carbazole structure and a preparation method thereof. technical background [0002] Polyimide (PI) is a class of polymer materials characterized by imide rings. It has excellent heat resistance and thermal oxidation stability, excellent environmental stability, insulation performance and mechanical properties. Therefore, It has been widely used in modern industries such as aerospace, aviation, machinery, and electronics. However, due to the strong rigidity of polyimide molecular chains and the strong interaction between molecular chains, most polyimides neither melt nor dissolve, and their processing and molding are difficult. [0003] Hyperbranched polymers are a type of highly branched polymers with a three-dimensional ellipsoidal structure, and have many excellent properties such as high solubility, low viscosity, good rheology, and a lar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G73/10C08J5/18
CPCC08G73/1085C08J5/18C08J2379/08
Inventor 谭井华赵胜球刘亦武黄杰何伟林熊宇风朱丽琼曾义吴若梅
Owner HUNAN UNIV OF TECH
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