Method for preparing inorganic nanoparticle/aromatic polyimide composite film and composite film prepared according to method

Abstract

The invention relates to a method for preparing an inorganic nanoparticle / aromatic polyimide composite film and the composite film prepared according to the method. The method comprises the followingsteps: complexing an aromatic polyimide film containing an imidazole structure and heavy metal ions; fluorating the aromatic polyimide film of which the surface is complexed with the heavy metal ionsto obtain a polyimide film of which the surface contains fluorocarbon bonds; introducing silicon hydroxyl to the polyimide film through the fluorocarbon bonds to form a polyimide film of which the surface contains silicon hydroxyl; introducing an inorganic nanoparticle layer through the silicon hydroxyl to obtain the composite film. With the adoption of the method, the selectivity of the fluorating reaction can be improved, so that the content of C-F bond on the surface of the polyimide film is increased, and chain scission of polyimide macromolecules can be avoided; the composite film is highin stem grafting density, elemental oxygen resistance and corona resistance.

Description

technical field [0001] The invention relates to the field of aromatic polyimide films, in particular to a method for preparing an inorganic nanoparticle / aromatic polyimide composite film and the prepared composite film. Background technique [0002] Aromatic polyimide (polyimide) is a high-performance polymer material with good mechanical properties, thermal properties and chemical stability. It plays an important role in aerospace, energy, electronics, etc. It is often used in Used as solar cell substrates, liquid crystal displays, gas separation membranes, etc. When used in some specific situations such as low-earth orbit, high-speed rail motors, and high-voltage power transmission and transformation, polyimide materials are required to have properties such as atomic oxygen resistance and corona resistance. The more economical and convenient method is to coat the surface of polyimide film Apply a protective inorganic coating with excellent resistance to atomic oxygen and ...

AI Technical Summary

Problems solved by technology

However, due to the high chemical reactivity of the fluorine gas in the fluorine / nitrogen gas mixture used, the selectivity of its chemical reaction with the macromolecular chains on the surface of the polyimide film is not strong, and it will react with the polyimide macromolecules. Chemical reactions at multiple sites on the chain, including main chain scission reactions

Although this main chain scission behavior may produce more active sites, it will obviously lead to the scission of the macromolecular chains on the surface of the polyimide film, and the molecular weight will be significantly reduced (forming small molecules), which will make the interfacial bonding strength of the subsequent formation not actually high

At the same time, simply increasing the fluorination intensity will only lead to the occurrence of more macromolecular chain scission behaviors, that is, it is impossible to greatly increase the number of subsequent derivatizable grafting reactive groups.

Images