Film of polyimide containing color base group, and preparation method

Abstract

This invention relates to a method for preparing polyimide thin film containing chromophore. The polyimide thin film, prepared by vapor deposition polymerization, can retain good thermal stability and chemical stability as that prepared by traditional method, and has such advantages as high uniformity, high compactness, no pin holes, no need for catalyst, no residual solvent, high purity and simple process. The polyimide thin film is suitable for fabricating photoelectrical devices such as optical switch.

Description

A kind of polyimide film containing chromophore and preparation method thereof technical field The invention belongs to the technical field of functional macromolecular materials, and in particular relates to a new polyimide film containing chromogenic groups and a preparation method thereof. Background technique Polyimide (PI) as a functional polymer material, due to its good thermal properties (the decomposition temperature of fully aromatic polyimide is generally around 500 ° C), excellent mechanical properties, stable chemical properties and Good dielectric properties, widely used in aerospace, microelectronics, nano, liquid crystal, separation membrane and other fields. There are many kinds of polyimides, and there are also multiple approaches in the synthesis. The most commonly used method at present is the solution method (StrunskusT., GrunzeM., Polyimides, Dekker, NewYork, 1996: 187), but there are also some defects in the solution method. The synthesis reaction o...

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Problems solved by technology

There are many kinds of polyimides, and there are also multiple approaches in the synthesis. The most commonly used method at present is the solution method (StrunskusT., GrunzeM., Polyimides, Dekker, NewYork, 1996: 187), but there are also some defects in the solution method. The synthesis reaction of polyimide prepared by solution method is carried out in high boiling point aprotic solvents such as dimethylformamide (DMF), N-methylpyrrolidone (NMP), and in the preparation process of polyimide film Among them, these high-boiling aprotic solvents are difficult to volatilize completely, and at the same time, volatiles are released during the cyclization (imidization) of polyamic acid, which is easy to generate pores in the material, and it is difficult to obtain high-quality, non-porous polyamides. imide material

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