Preparation method of graphene/polyimide composite material

Abstract

The invention discloses a preparation method of a graphene / polyimide composite material, belonging to the technical field of composite materials. The preparation method comprises the following steps: performing ultrasonic dispersion of graphene oxide in a dimethyl sulfoxide solvent to obtain graphene oxide dispersion; crosslinking and coupling the graphene with 2-vinyl-5-aminothiophenol under the effect of a coupling agent vinyldimethoxysilane and a crosslinking agent N,N-methylene bisacrylamide to obtain modified graphene containing mercapto, carbon-carbon double bond and amino cross-linkable groups; condensing 4,4-diaminodiphenyl ether and pyromellitic dianhydride to obtain polyamide acid; and crosslinking the modified graphene containing different cross-linkable groups with polyamide acid to obtain a modified graphene / polyimide composite material. In the invention, the interface bonding between graphene and polyimide matrix is strong, the compatibility with a polymer is good, and the mechanical properties of the material are improved.

Description

technical field [0001] The invention discloses a preparation method of a graphene / polyimide composite material, which belongs to the technical field of composite materials. Background technique [0002] Polyimide is widely used in aerospace due to its excellent electrical properties, mechanical properties, excellent chemical resistance, solvent resistance, high thermal stability, small thermal expansion coefficient and good processability , electronic appliances, military equipment, automobiles, communications and other cutting-edge technology fields. However, with the expansion of the application field, the continuous improvement of the requirements for the high performance of the product and the stability of the product in various environments, the traditional polyimide resin can no longer fully meet the needs of the continuous development of various fields, and the polyimide resin must be further improved. The mechanical properties, thermal stability and hydrophobicity o...

AI Technical Summary

Problems solved by technology

[0004] The technical problem mainly solved by the present invention: Aiming at the problem that the interface between graphene and polymer matrix is ​​weak and the compatibility with polymer is poor, a preparation method of graphene / polyimide composite material is provided , the present invention is that graphite oxide is ultrasonically dispersed in a dimethyl sulfoxide solvent to obtain a graphene oxide dispersion, and then the graphene is mixed with a coupling agent vinyldimethoxysilane, a crosslinking agent N, N-methylenebis Under the action of acrylamide, it is crosslinked and coupled with 2-vinyl-5-mercaptoaniline to obtain modified graphene containing mercapto, carbon-carbon double bonds, and amine crosslinkable groups, and then 4,4-diamino Diphenyl ether and pyromellitic dianhydride are condensed to obtain polyamic acid, and finally the modified graphene with crosslinking groups is crosslinked with polyamic acid to make a modified graphene / polyimide composite Material