Process for synthesizing composite film of polyacylimide/nano barium phthalate with high deelectric constant

Abstract

The process of synthesizing composite polyimide / nanometer barium titanate film with high dielectric constant includes the following steps: adding maleic anhydride and diamine in the same molar amount into N-methyl-2-pyrrolidone or N, N-dimethyl acetamide as solvent to compound solution with solid content of 10-20 %, adding nanometer modifying barium titanate particle in the amount less than 40 % of the composite film weight into the solution and ultrasonically dispersing, stirring continuously at room temperature for 18-24 hr to obtain polyamic acid, pouring the polyamic acid on glass plate mold, and vacuum heating to eliminate solvent and iminate to obtain the composite polyimide / nanometer barium titanate film. Thus prepared film has excellent heat stability, high oxidative degradation resistance, high dielectric constant and low dielectric loss, and may be used for wound film capacitor, printed circuit board, semiconductor device, etc.

Description

technical field [0001] The invention relates to a synthesis method of nitrile-containing and silicon-containing polyimide / nano barium titanate composite film with high dielectric constant. Background technique [0002] Polyimide is a kind of polymer material with high temperature resistance, low temperature resistance, radiation resistance, excellent chemical stability and good mechanical strength. It has been widely used in aerospace, electrical and electronic and other high-tech fields. Nano-hybrid materials are the fourth generation of materials after single-component materials, composite materials, and shaved functional materials. Nanoparticles belong to the transition region between atomic groups and macroscopic objects, and are atomic or molecular aggregates composed of few atoms or molecules, with a scale of 1-100nm. Due to the small particle size and shell structure of nanoparticles, nanomaterials have four effects, namely small size effect, surface and interface ef...

AI Technical Summary

Problems solved by technology

In the selection of dielectric materials for embedded capacitors, although ceramics have a high dielectric constant, they need to be sintered at high temperatures and cannot be used for organic substrates

And simple ceramics are too brittle, poor processability, and poor adhesion to copper foil

On the other hand, polymers have excellent mechanical properties and flexibility, good adhesion to substrates and metals, low molding processing temperature, but too low dielectric constant

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