Abstract
Polyimide/TiO 2 (PI/TiO 2 ) composite films were fabricated by in-situ polymerization and are reported in this paper. The effect of interface (PI-TiO 2 ) on dielectric and breakdown properties was investigated via conductivity, photo-stimulated discharge (PSD), permittivity, thermo-gravimetric analysis (TGA) and breakdown characteristic. The results show that interface between PI and TiO 2 in composites contains deep charge traps with density proportional to TiO 2 doping concentration. Interface enhances space-charge polarization to increase conductivity and loss tangent at low frequency. The pinning influence of interface on PI molecular chain motion is reflected in the downtrend of permittivity (0%-4% nano-TiO 2 doping concentration) and increasing decomposition temperature (T PI <;T 3% <;T 7% ). When exposed to corona ageing, the PI matrix rather than interface or nano-TiO 2 is initially damaged, and the remaining mixture of interface and nano-TiO 2 are accumulated gradually on the PI/TiO 2 surface forming a “protective” layer which slowing down further PI/TiO 2 erosion in corona ageing.
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