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RGO/polyimide composite aerogel, preparation method and application thereof

A composite airgel and polyimide technology, applied in the field of multifunctional materials, can solve the problems of limited electrical conductivity, high heat dissipation capacity, etc., achieve low cost, improve load bearing and bending resistance, and realize large-scale and large batches The effect of production

Inactive Publication Date: 2020-06-02
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its high heat dissipation capacity, high electrical conductivity, and significant plastic deformation or brittle mechanical properties limit its wider application in the field of microwave absorption.

Method used

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  • RGO/polyimide composite aerogel, preparation method and application thereof
  • RGO/polyimide composite aerogel, preparation method and application thereof
  • RGO/polyimide composite aerogel, preparation method and application thereof

Examples

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Embodiment 1

[0029] The lightweight rGO / polyimide composite multifunctional airgel of the present invention is prepared by the following method:

[0030] Step 1, preparation of polyamic acid: add 3.96g of 4,4'-diaminodiphenyl ether into 200mL of N,N-dimethylacetamide solution, stir well, then add 4.36g of pyromellitic tetra Formic acid dianhydride, continue to stir, then pour the reaction solution into excess deionized water, and finally filter, wash, and dry the resulting precipitate under vacuum at 60°C to obtain a dry product;

[0031] Step 2, preparation of rGO / polyimide precursor solution: Add 1 g of the dry product obtained in step 1 to 18.52 mL of deionized water containing 0.48 g of triethylamine, and stir magnetically for a period of time to obtain a polyimide precursor solution; add 5mL graphene oxide solution to the polyimide precursor solution, stir evenly, freeze-dry the mixed material for 24h, and record it as rGO / PI (rGO / polyimide composite airgel precursor);

[0032] In st...

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Abstract

The invention discloses an rGO / polyimide composite aerogel. The composite aerogel is a three-dimensional conductive network structure formed by interpenetrating rGO of a sheet structure, and polyimideserves as a supporting framework and is located among the sheet structure rGO. The rGO / polyimide composite aerogel is microscopically a two-dimensional lamellar adhesion structure and macroscopicallyhas a porous structure, lamellar structure rGO adheres to each other to provide an effective transmission path for electron transmission, and the porous structure plays a decisive role in light weight and heat resistance of the material; polyimide calcined at a proper temperature endows the composite material with better mechanical properties, so that the bearing capacity and compression resistance of the composite material are effectively improved; due to the introduction of porous rGO, and the electrical conductivity of the composite aerogel is improved, thus facilitating use of the composite aerogel as an electromagnetic wave absorbing material to absorb and attenuate electromagnetic waves.

Description

technical field [0001] The invention relates to an rGO / polyimide composite airgel, and also relates to a preparation method of the composite airgel and its application as an electromagnetic wave-absorbing material, belonging to the technical field of multifunctional materials. Background technique [0002] Modern electronic equipment is becoming more and more popular in the military and civilian fields, and the electromagnetic wave pollution caused by it is also intensifying. It is urgent to reduce the electromagnetic interference problem. Electromagnetic shielding and absorbing materials, as key materials for protecting human beings and precision equipment, have received extensive attention. Since traditional powder materials can no longer meet the multi-faceted requirements in practical applications, many researchers have begun to devote themselves to the development of advanced multifunctional materials, among which airgel has attracted much attention due to its advantage...

Claims

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Application Information

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IPC IPC(8): C08L79/08C08K3/04C08J9/28C09K3/00
CPCC08J9/28C08J2201/0484C08J2379/08C08K2201/001C09K3/00C08K3/042
Inventor 姬广斌顾未华陈家斌赵越张铸
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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