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A polyimide-based graphene composite foam material with multi-level structure and its preparation

A graphene composite and polyimide-based technology, applied in the field of porous foam materials, can solve the problems of poor electromagnetic wave reflection loss, narrow microwave absorption frequency bandwidth, and lack of electromagnetic absorption capacity, etc., to achieve heat resistance and good insulation The effect of thermal performance

Active Publication Date: 2021-07-27
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For polyimide foam, it has intrinsic electrical insulation properties, so it has poor reflection loss for electromagnetic waves and does not have good electromagnetic absorption capacity. Therefore, it can be adjusted by adding conductive graphene to prepare composite foam to adjust its impedance matching. characteristics so as to obtain good electromagnetic absorption performance, but the graphene / polyimide composite material has a relatively narrow microwave absorption frequency bandwidth due to its single component impedance characteristics

Method used

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  • A polyimide-based graphene composite foam material with multi-level structure and its preparation
  • A polyimide-based graphene composite foam material with multi-level structure and its preparation
  • A polyimide-based graphene composite foam material with multi-level structure and its preparation

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Preparation of tertiary polyimide-graphene / polyimide-graphene composite foam (PI-GP 1 / 2 -rGO)

[0040] (1) Preparation of polyimide foam (PI)

[0041] Using N,N'-dimethylacetamide as a solvent, the solid content of 15 % polyamic acid. The specific process is as follows: Dissolve 8.0096g of 4,4'-diaminodiphenyl ether in 95.57g of N,N'-dimethylacetamide, add 8.8556g of pyromellitic dianhydride, and react in an ice-water bath at 0°C 5h. Then, 4.0476 g of triethylamine was added, and the reaction was continued for 5 h to prepare a water-soluble polyamic acid solution with a solid content of 15%. The prepared water-soluble polyamic acid is suspended on a high place and dripped into deionized water for precipitation in the form of flowing silk, and the organic solvent is replaced, and then the precipitate is washed with deionized water for 2-3 times, and finally the vacuum is used to 1 Pa, a vacuum freeze dryer with a temperature of -80°C is used for freeze-drying, and t...

Embodiment 2

[0049] Preparation of tertiary polyimide-graphene / polyimide-graphene composite foam (PI-GP 2 / 3 -rGO)

[0050] (1) prepare polyimide foam (PI): preparation method is identical with embodiment 1;

[0051] (2) Preparation of two-stage polyimide-graphene / polyimide composite foam (PI-GP 1 / 2 ): Compared with Example 1, the mixed solutions of graphene oxide and polyamic acid loaded with different concentration ratios. The specific operation method is as follows: prepare a graphene oxide dispersion with a concentration of 4 mg / mL under ultrasonic conditions; dissolve water-soluble polyamic acid prepolymer and triethylamine in water to prepare a concentration of 2 mg / mL and 1 mg / mL respectively A mixture of polyamic acid solution and triethylamine solution. The prepared graphene oxide dispersion and polyamic acid / triethylamine mixed solution were mixed under magnetic stirring. The polyimide foam (PI) prepared in the step (1) is put into the above mixed solution, and impregnated and...

Embodiment 3

[0054] Preparation of tertiary polyimide-graphene / polyimide-graphene composite foam (PI-GP 1 / 3 -rGO)

[0055] (1) prepare polyimide foam (PI): preparation method is identical with embodiment 1;

[0056] (2) Preparation of two-stage polyimide-graphene / polyimide composite foam (PI-GP 1 / 2 ): Compared with Example 1, the mixed solutions of graphene oxide and polyamic acid loaded with different concentration ratios. The specific operation method is as follows: prepare a graphene oxide dispersion with a concentration of 4 mg / mL under ultrasonic conditions; dissolve water-soluble polyamic acid prepolymer and triethylamine in water to prepare a concentration of 8 mg / mL and 4 mg / mL respectively A mixture of polyamic acid solution and triethylamine solution. The prepared graphene oxide dispersion and polyamic acid / triethylamine mixed solution were mixed under magnetic stirring. The polyimide foam (PI) prepared in the step (1) is put into the above mixed solution, and impregnated and...

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Abstract

The invention discloses a multi-level structure polyimide-based graphene composite foam material and its preparation, belonging to the technical field of porous foam materials. The present invention uses polyimide foam as the skeleton, adopts the mixture of graphene oxide and polyamic acid (second stage) and graphene oxide (third stage) with different concentration ratios loaded by graded vacuum impregnation, freeze-drying and heat treatment and other technologies Preparation of polyimide-based graphene composite foam with hierarchical structure. The polyimide-based graphene composite foam prepared by the present invention has stable structure, low shrinkage rate and high thermal stability, and realizes effective absorption of incident electromagnetic waves while maintaining good heat insulation and thermal stability properties, and It has a wide frequency bandwidth. Its comprehensive performance is excellent, the preparation process is simple and easy to operate, and it is environmentally friendly, which broadens the application range of the polyimide foam.

Description

technical field [0001] The invention relates to a multi-level polyimide-based graphene composite foam material and its preparation, belonging to the technical field of porous foam materials. Background technique [0002] Foam refers to a porous material composed of various microporous solids and the dispersed phase is gas. It has the characteristics of low density, high specific surface area, rich and stable pore structure, adjustable components, and variable performance. It is used in many fields such as construction, automobiles, aerospace, household appliances, petrochemical plants, outdoor sports, electromagnetic shielding, and electromagnetic absorption. All have good application prospects. [0003] For polyimide foam, it has intrinsic electrical insulation properties, so it has poor reflection loss for electromagnetic waves and does not have good electromagnetic absorption capacity. Therefore, it can be adjusted by adding conductive graphene to prepare composite foam ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/42C08J9/40C08J9/36C08L79/08
CPCC08J9/36C08J9/40C08J9/42C08J2379/08C08J2479/08
Inventor 刘天西蒲磊王子成樊玮侯豪情
Owner JIANGNAN UNIV
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