Low-temperature plasma polymerized fluorocarbon coating promotes surface charge dissipation in polystyrene

Abstract

Polystyrene (PS) is a common insulating material in pulsed power devices, which has excellent and reliable insulation properties. However, the charge accumulation on the insulator surface seriously threatens its surface insulation property. Surface modification has been verified as an effective way for inhibiting surface charge accumulation. In this paper, plasma polymerized fluorocarbon (PPFC) coating was prepared by low-temperature plasma polymerization in the mixture of methyl-methacrylate and dodecafluoroheptyl-methacrylate (DFHMA). Compared with the untreated PS, the surface charge dissipation rate of PPFC coating is increased by more than 6 times. The introduction of DFHMA makes the coating have no obvious ageing effect after the storage, and has good reusability after the surface flashover. This work provides a new method for modification of polymer dielectrics and a novel way for the preparation of high-charge-dissipation polymers in other related fields.

Large‐scale plasma grafts voltage stabilizer on hexagonal boron nitride for improving electrical insulation and thermal conductivity of epoxy composite

“…The 2 μl bubble was introduced on the two‐phase interface to study the gas contact angle and surface potential decay speed at 25°C. The gas contact angle was recorded by Dataphysics OCA20 and the residual surface potential is detected using a Kelvin probe (Trek 6000B) [30]. The apparent charge of PD was measured using the KJF‐2020 partial discharge measuring system (Yangzhou Kejia Electronic Equipment Co., Ltd.).…”

“…It has the function of grafting, also known as anchoring, and may be beneficial to reduce the migration of voltage stabilizers in the matrix when stabilizers are anchored by large‐weight nanoparticles. However, industrial scalable manufacturing of nanomaterials is very important [29], and the conventional plasmas used in previous work need to be excited by rare gases [30] or low pressure [31], which have low compatibility with production lines. The air excited surface dielectric barrier discharge (SDBD) plasma does not need the vacuum system [32].…”

Excellent Vacuum Pulsed Flashover Characteristics Achieved in Dielectric Insulators Functionalized by Electronegative Halogen–Phenyl and Naphthyl Groups

“…Li et al 23 modify the trapping characteristics of cross-linked polyethylene (XLPE) by changing its crystallinity and grain size through annealing the samples with different cooling temperature profiles, achieving an enhancement of vacuum flashover performance comparable to nanocomposites, while avoiding introducing too many defects caused by poor structural compatibility. Duan et al 24 and Zhang et al 25 have reported that by directly fluorinating the surface of highdensity polyethylene (HDPE) and PS in fluorine gas or plasma-containing fluorine ions, respectively, their vacuum flashover performance can be improved.…”

Microscopic Pyrolytic and Electric Decomposition Mechanism of Insulating Polyimide/Boron Nitride Nanosheet Composites based on ReaxFF

“…Accumulated heat will deepen the internal temperature gradient of the material, thereby causing electric field distortion, which is unfavourable to material surface insulation [ 7 , 8 , 9 , 10 ]. On the other hand, environmental factors, such as intense electric fields and the generation of reactive species in plasma by corona discharge, will also lead to insulation ageing or even the failure of PI [ 11 , 12 ]. Therefore, in recent years, research on improving the thermal conductivity of PI to achieve rapid heat dissipation while also improving its insulation stability in various working environments has received considerable attention.…”