High‐Temperature Polymer Dielectrics for Aerospace Electrical Equipment

Space-based solar power stations and all-electric aircraft enable the large-scale development and utilization of renewable energies in the aerospace field. Aerospace electrical equipment for energy conversion, transmission, and utilization requires high-performance polymer dielectrics. These dielectrics need to withstand thermal, electrical, mechanical, and other stresses and may also need to withstand high-energy particle irradiation. This chapter reviews the evolution of electrical properties such as dielectric constant, dielectric loss, conductivity, electric breakdown, surface discharging, partial discharge, and electrical treeing of polymer dielectrics under severe service conditions such as high temperature, high voltage, high frequency, and energetic electron irradiation. The methods for improving the electrical performance of high-temperature polymer dielectrics are summarized, such as inorganic and organic nano-doping, micro-doping, surface inorganic high-potential barrier layer, surface organic coating, multi-layer gradient functional structure, and molecular chain modification. It provides support for the structure design and fabrication of high-performance, high-temperature polymer dielectrics.