High-conductivity polyimide/carbon material/silver three-phase composite film and preparing method thereof

Abstract

The invention relates to a high-conductivity polyimide / carbon material / silver three-phase composite film and a preparing method thereof, and belongs to the field of electric-conduction and electromagnetic shielding composite films. The preparing method of the polyimide composite film includes the steps that polyamide salt formed by dicarboxylic anhydride and diamine in a condensation polymerization mode serves as a precursor, carbon materials in a certain proportion and silver with silver trifluoroacetylacetone as a precursor are doped into the polyamide salt, and high-temperature imidization is carried out to obtain the film. The mass percent of the silver ranges from 0% to 20%, and the mass percent of the carbon materials ranges from 0% to 30%. The molecular proportion of dicarboxylic anhydride monomers to diamine monomers ranges from 1-1.2:1. The polyimide composite film prepared with the method has the advantages that the resistance and the electromagnetic shielding effectiveness are adjustable, the preparing technology is simple, density is low, conductivity is high, flexibility is good, and the corrosion resistance is achieved, and therefore the polyimide composite film is widely suitable for the electronic fields such as microwave absorption and EMI shielding and the photoelectron field.

Description

technical field [0001] The invention belongs to the field of conductive and electromagnetic shielding composite films, in particular to a highly conductive polyimide / carbon material / silver three-phase composite film and a preparation method thereof. Background technique [0002] Polymer-based conductive composite materials are widely used in the fields of electronics, electronics, microelectronics, and optoelectronics due to their low density, simple molding process, corrosion resistance, and good flexibility, especially in the research of electromagnetic shielding materials. . The preparation of polymer-based conductive composites usually uses fillers with high conductivity, such as metal powder and metal fibers, in the polymer matrix to make the final composite material have high conductivity and electromagnetic shielding function. However, a single metal filler will not only increase the density of the polymer matrix, but a large amount of metal filler will also reduce t...

AI Technical Summary

Problems solved by technology

However, a single metal filler will not only increase the density of the polymer matrix, but a large number of metal fillers will also reduce the flexibility of the material, and the corrosion-prone characteristics of metal materials will also affect the long-term performance of the composite material to a certain extent