Polyester- g -Polycarbonate-Modified Silicon Nanoparticles for High-Performance and Stable Enameled Copper Wire Coatings

Abstract With the increasing demand for green and environmentally friendly approaches in transportation and industrial sectors, enameled copper wires play a crucial role as an essential part of electric magnet applications. However, the currently in use coating polymers have a low-temperature operation range, unstable coating, and short life spans. This research work provides a single in situ covalent composite via the synthesis of a copolymer of polyester-g-polycarbonate grafted with saline-modified silicon nanoparticles. The copolymers are synthesized using a transesterification reaction, followed by the incorporation of silicon surface-modified nanoparticles. Characterization analysis confirms the successful formation of the copolymer−nanoparticle hybrid. Accordingly, the temperature stability analysis shows that the system polyester-g-polycarbonate@SiO2 compares with the copolymer and bare polyester to achieve a high temperature stability range of -30−200 °C. Moreover, the produced composite has better insulation resistance and coating stability under low- and high-temperature operations. This work uniquely produced a highly stable copper coating with high performance and possible industrial scalability.