Fluorine-containing modified polyimide as well as preparation method and application thereof

The invention provides fluorine-containing modified polyimide as well as a preparation method and application thereof, and belongs to the technical field of modified polyimide. Fluorine atoms have the lowest polarizability, and fluorine-containing groups are introduced into a polyimide molecular chain, so that the polarizability of polyimide can be reduced, and the dielectric constant is reduced; moreover, a dianhydride chain segment and a diamine chain segment in the polyimide contain fluorine atoms, the content of the fluorine atoms is increased, and the dianhydride chain segment and the diamine chain segment are of a symmetrical structure, so that a lower dielectric constant can be obtained; in addition, the space volume of fluoromethyl is large, polyimide molecular chains can become loose, and the dielectric constant of polyimide is further reduced. The result of the embodiment shows that the dielectric constant of the fluorine-modified polyimide is reduced to 2.4. 本发明提供了一种含氟改性聚酰亚胺及其制备方法和应用，属于改性聚酰亚胺技术领域。氟