Preparation and properties of titanate nanotube-dispersed polyimide dielectric composites

In order to find a better performance polyimide-based composite, titanate nanotubes (TNTs）were prepared by hydrothermal method. TNTs were incorporated into polyimides, and PI/TNTs composite films were prepared by in situ sol-gel method. FTIR, SEM and XRD are used for the characterization of microstructure and morphology of polyimide-based composite films. TG tested the thermal stability of the material, and the results showed that the thermal stability of the film doped with TNTs in PI was significantly enhanced, and the thermal stability performance of the composite film was better with the increase of TNTs. Through dynamic mechanical analysis, it is shown that the storage modulus of the material increases with the increase of its enhanced phase content, and the storage modulus gradually decreases with the increase of temperature when the doping amount is certain and the temperature increases. The composite film has strong absorption of 365.0nm ultraviolet light, and the ultraviolet light of this wavelength has the greatest effect on the increase of the dielectric constant of PI/TNTs, and the results show that the PI/TNTs composite film has certain ultraviolet responsiveness. This paper provides a new method for the development of polyimide-based composites with excellent mechanical properties at high temperature.