Preparation and characterization of polyimide/silica-barium titanate nanocomposites

The silica-barium titanate (SiO2-BaTiO3) nanocomposites coated with polyimide had been synthesized successfully by a dispersion polymerization method. The conformation, structure, and size Of SiO2-BaTiO3 nanocomposites coated with polyimide were investigated by using FT-IR, EDAX, XRD,TEM, SEM, and TGA. The results indicate that there is a thin layer polymer of SiO2-BaTiO3 nanocomposites surface, in which the polymer thickness is about 10 nm and the size of them are about 50-60 nm, and the particles are well-dispersed with even particle size. In addition, the crystal structure of BaTiO3 is stable in preparing composite process and the chemical bond is formed between the inorganic phase and the polymer matrix.