| Organic/inorganic hybrid materials have obtained more and more attentions in the fields of mechanics, thermodynamics, optics, electromagnetics, and biology etc, for their special properties. Polyesterimide, as a typical kind of non-solvent impregnating resin, has been widely used in the electronic and electric industry because of its outstanding performances, such as highly heat-resistance, good radiation-resistance, easily solidified in low temperature, steadily reserved, excellent combination properties. However, it has inferior corona-resistance property, which limits its application in the fields of variable frequency adjusting speed. In order to obtain excellent electric properties especially on the corona resistance, the nano-sized alumina/polyesterimide composites have been systhesized and characterized.In this paper, nano-alumina were prepared with aluminium isopropoxide. A new class of polyesterimide composites with various amounts of nano alumina has been synthesized and characterized.The resins were characterized and analyzed by FTIR, SEM, TGA, dielectric spectroscope and corona resistance equipment etc. It turned out that a homogeneous hybrid system has formed. Nano-particls were dispersed well in the organic phase. The FTIR spectrogram of hybrid polyesterimide resin indicates the existence of alumina in the hybrid materials. The TGA testing demonstrates that the hybrid resins'thermal stability is inferior to the pure polyesterimide resins appropriately. The dielectric loss tanδof alumina/ polyesterimide composites increased with the increasing of alumina content under 9wt%. The corona resistance property of the hybrid polyesterimide is obvious increased, and the corona resistant time of the hybrid polyesterimide resin with 9wt% content of alumina is 3.5 times longer than that of the pure resin.
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