Cycloolefin copolymer / anthracene composite dielectric thin film and its preparation method

Abstract

This invention relates to the field of polymer insulating materials, and discloses a cyclic olefin copolymer / anthracene composite dielectric film and its preparation method. The composite dielectric film comprises a composite film made of 100 parts by mass of a cyclic olefin copolymer and 0.1 to 2.0 parts by mass of anthracene. The anthracene is homogeneously dispersed at the molecular level within the copolymer matrix, forming a deep trap network constructed from both electron and hole deep traps within its band gap. The preparation method includes heating and stirring the raw materials in a solvent to form a homogeneous blend solution, coating the solution, allowing it to stand at room temperature for evaporation, heating and drying, and then peeling it off to form a film. By constructing a deep trap network through energy level misalignment between small molecules and the matrix, this invention effectively captures free carriers under high-temperature and strong electric field conditions, blocks long-range migration channels and reduces leakage current, while avoiding interface defects easily caused by inorganic doping, thus improving the high-temperature insulation reliability and energy storage density of the composite film.

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