Synthesis and electric properties of nano-hybrid polyimide/silica film

In this paper, a kind of nano-hybrid polyimide/silica film was prepared in-situ using Methyltriethoxysilane as the precursor of the inorganic moiety through sol-gel reaction in the polyamic acid of N, N-dimethylacetamide solution. The surface morphology of the film was characterized by atomic force microscope (AFM) and compared with each other as aminopropyltriethoxysilane that served as a kind of coupling agent was, in addition, introduced into one of the hybrid systems. And the electric properties such as dielectric constant ε, dielectric loss tant δ, and volume resistance ρ_v with SiO₂ content and the morphology between the organic and inorganic phases were discussed. It turned out by the experiments that the incorporation of the inorganic moiety, its content variation and the character of interface between the two phases had great effects on the properties of the hybrid film compared with the pure polyimide film.