Electrical and mechanical characteristics of polyimide nanocomposite films for wind generator

With the advantages of clean, renewable and wide distribution, wind power generation becomes an important part of the smart grid. Wind generator is the key apparatus in application of wind energy, which has been paid great attention to its operation reliability. Partial discharge in the insulation system is a serious threat to its safe operation. Polyimide (PI) has been widely applied as one of the most important organic materials owing to its excellent physical and chemical properties. And nano particals are incorporated in polyimide to enhance the properties, such as breakdown characteristics. In this paper, polyimide/Al₂O₃ (PI/Al₂O₃) nanocomposite films were prepared using in-situ dispersion polymerization process. The mechanical and electrical characteristics of the PI/Al₂O₃ nanocomposite films with different alumina content comparing to the unfilled polyimide film, including the tensile strength and elongation, dielectric spectroscopy, dielectric breakdown strength and the corona resistance property as well, were studied.