Colorless and transparent polyimide nanocomposite membrane and preparation method thereof

The invention discloses a colorless and transparent polyimide nanocomposite membrane. The polyimide nanocomposite membrane comprises, by weight, 0.01-5.00% of inorganic nanoparticles, and the balance polyimide. The structural unit of the polyimide is specified in the specification. The colorless transparency of the polyimide is achieved on the basis of the introduction of an alicyclic ring structure and a trifluoromethyl and phenylate structure, different combined methods and inorganic nanoparticles of different kinds are utilized for being combined, the colorless and transparent polyimide nanocomposite membrane with the good heat resistance is obtained by controlling the addition amount of the inorganic nanoparticles, the glass-transition temperature of the membrane exceeds 250 DEG C, the light transmissivity at the 450 nm position is higher than 90%, and the ultraviolet cut-off wavelength is about 300 nm.