Fluorosilicon coating prepared by high-throughput low-temperature plasma for promoting surface charge dissipation of polystyrene

Polystyrene (PS) is a common insulating material in pulsed power equipment, 1 and it has excellent microwave-transmitting properties. However, the surface charge accumulated on the surface of P S seriously threatens its surface insulation performance. 2 Here, a method of preparing a Perfluorodecyltrimethoxysilane/methyl methacrylate polymer coating on the surface of PS by reactive species of high throughput of o p e n - a i r surface dielectric barrier discharge (SDBD) plasma is reported. EDX and SEM show t he difference in physical and chemical components before an d after coating. Compared with pure PS, the surface charge dissipation rate of the PS with plasma polymerized fluoro silicon compound coating is increased by 132.0% compared with the pure P S , and the flashover strength of the nanosecond pulse voltage is increased by 36.4%. The Density Functional Theory calculation was used to discuss the effect mechanism of coating on surface charge dissipation. The method reported here provides a new idea for insulation enhancement in power electronics and other fields.