Effects of Coupling Agent on Morphology and Properties of Polyimide/ SiO2-Al2O3 Hybrid Films

In this paper, a new type of PI/SiO
₂
-Al
₂
O
₃
hybrid film was prepared by sol-gel method. The effects of gamma-aminopropyl triethoxysilane(DB-550) were studied as follows: the micro-morphology of inorganic phase of the films was characterized by Atomic force microscope (AFM); the thermal property of hybrid films was measured by thermogravimetric analysis (TGA) and the breakdown strength was got from breakdown strength apparatus. The results indicated that the participation of quantificational coupling agent (DB-550) produced more chemical bonds between inorganic phase and organic phase, which enhanced the compatibility of two phases. The thermo-decomposed temperature and the breakdown strength of the hybrid films doped coupling agent were all improved