A kind of surface silicon oxidation polyimide-co-siloxane film and preparation method thereof

Abstract

The invention discloses a surface silicon oxidation polyimide-co-silane thin film and a preparation method and belongs to the technical field of polyimide preparation. The invention provides the surface silicon oxidation polyimide-co-silane thin film. The preparation method comprises the following steps: firstly, preparing polyimide-co-silane by adopting a temperature raising and pressurizing method on the basis of a traditional two-step preparation method; and secondly, forming a glass-like functional layer on the surface by controlling conditions and adopting atomic oxygen equipment. The surface silicon oxidation polyimide-co-silane thin film consists of three parts, namely a glass layer, a transition layer and a substrate layer, wherein the glass layer consists of a silicon-oxygen structure, the transition layer consists of the silicon-oxygen structure and the polyimide-co-silane and the substrate layer consists of the polyimide-co-silane. The surface silicon oxidation polyimide-co-silane thin film, disclosed by the invention, has the advantages of excellent atomic oxygen resistance and capability of self-healing. The glass-like functional layer avoids the occurrence of a cold welding phenomenon.

Description

technical field The invention relates to the technical field of polyimide preparation, in particular to a surface silicon oxidation polyimide-co-siloxane film and a preparation method thereof. Background technique After the completion of the space shuttle mission in 1981, a special phenomenon was discovered during the visual inspection of the staff: a significant change occurred on the surface of the thermal control pad of a TV camera made of polyimide film material. The glossy, transparent amber film prior to flight turns a translucent pale yellow. After research, it was found that it was the result of atomic oxygen erosion. Atomic oxygen has begun to attract the attention of the aerospace industry. Researchers from various countries have conducted a lot of research on the mechanism of interaction between atomic oxygen and materials, and have developed different types of anti-atomic oxygen materials. Silicone resin-based coating materials have excellent anti-atomic oxyge...

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Problems solved by technology

The occurrence of cold welding seriously affects the normal function of the spacecraft mechanism, and even leads to flight accidents

In recent years, Japan has developed polyimide-co-siloxane anti-atomic oxygen materials, which exhibit excellent anti-atomic oxygen properties, but due to the introduction of siloxane, the adhesion of the material is greatly increased. The phenomenon of cold welding has not been better resolved

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