A kind of polyimide/fluorinated graphene composite film and preparation method thereof

Abstract

The invention provides a polyimide / fluorinated graphene composite film and a preparation method thereof. The preparation process comprises the steps of obtaining sol containing fluorinated graphene by a solution blending process by taking a polyimide precursor polyamide acid (PAA) as a matrix and single-layer fluorinated graphene as a reinforcement; performing film casting, standing and defoaming; finally performing a step heating process for thermal imidization to obtain the polyimide / fluorinated graphene composite film. The composite film prepared by the method has the advantages of good optical property, good mechanical property and low dielectric constant.

Description

technical field [0001] The invention relates to the field of chemical materials, in particular to a composite film and a preparation method thereof. Background technique [0002] Polyimide resin is a special polymer material with a wide range of uses. It has excellent physical and mechanical properties, such as high temperature resistance and low temperature resistance, high tensile strength, low linear expansion coefficient, suitable elastic modulus, minimal thermal shrinkage, good self-lubrication and very Strong radiation resistance. It also has excellent chemical stability. Polyimide resin can be made into molding powder, film, paint, foaming material, hollow tube, etc., and can be widely used in engineering plastics, aviation, aerospace, electrical engineering, electronics, environmental protection, new energy, medicine and information Recording and its imaging technology and materials and many other fields. Among them, the product with the largest amount is film. ...

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Problems solved by technology

[0003] However, due to the rigidity of the main molecular chain and strong intermolecular interactions of commercialized standard polyimides, they are often insoluble and infusible, and their processing performance is poor, which limits their further applications, especially difficult to reprocess into thin films and paint use

In addition, due to the high aromatic conjugation and strong charge transfer complexation in the molecular chain of general-purpose polyimide, the prepared polyimide film is dark (yellow or brown) and optically transparent. Poor performance; light-colored and transparent polyimide materials are widely used in many high-tech fields, such as optical waveguides in the field of optical fiber communications, substrate materials for solar cell arrays in the aerospace field, and antenna reflections. / Collector materials, etc.; at the same time, the dielectric constant of polyimide is high (the dielectric constant of polyimide is about 3.5), and polyimide is generally used as a substrate as an insulator in the application of highly integrated circuits and microelectronics , interlayer or medium, due to the large dielectric loss, the energy consumption increases, causing the medium to heat up and making it easy to be broken down, so it is difficult to meet the needs of the rapid development of the modern microelectronics industry

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