Silicone Rubber Composites with High Breakdown Strength and Low Dielectric Loss Based on Polydopamine Coated Mica

Abstract

High breakdown strength and low dielectric loss are necessary for the outdoor insulator using silicone rubber (SR) composites. In this work, polydopamine coated mica (mica-PDA) was synthesized via bioinspired dopamine self-polymerization, and mica-PDA-filled SR composite (SR/mica-PDA-VTMS) was prepared using vinyl tri-methoxysilane (VTMS) as a silane coupling agent which serves as the molecular bridges between the organic rubber and the inorganic filler. The SR/mica-PDA-VTMS composite demonstrated dense and uniform morphology where the filler was well dispersed. Due to the strong interfacial interactions between filler and rubber, the SR/mica-PDA-VTMS composite exhibits much lower dielectric loss compared to the other mica-filled SR composites, which was comparable to the prepared alumina-tri-hydrate-filled SR composites. Moreover, the breakdown strength of ~31.7 kV/mm and tensile strength of 5.4 MPa were achieved for the SR/mica-PDA-VTMS composite, much higher than those of the other as-prepared SR composites.

Sulfonated poly(ether ether ketone) composite membranes based on amino‐modified halloysite nanotubes that effectively immobilize phosphotungstic acid

“…For DHNTs, there exist two peak components with the binding energy at 398.5 eV for N and 399.5 eV for NH, which were formed by the indole groups through structure evolution during the self‐polymerization of dopamine. [ 21,30 ] While for PEI‐DHNTs, an additional N1s peak at 400.7 eV could be found in the spectrum, which is related to NC due to the crosslinking between PEI and PDA. [ 25 ]…”

“…For DHNTs, there exist two peak components with the binding energy at 398.5 eV for N and 399.5 eV for F I G U R E 1 (a) XPS survey scan spectra of HNTs, DHNTs, and PEI-DHNTs, (b) N1s spectra of DHNTs and PEI-DHNTs N H, which were formed by the indole groups through structure evolution during the self-polymerization of dopamine. [21,30] While for PEI-DHNTs, an additional N1s peak at 400.7 eV could be found in the spectrum, which is related to N C due to the crosslinking between PEI and PDA. [25] TGA was conducted to further confirm the deposition of organic layers on the surface of nanotubes.…”

Analysis of the Electrical and Thermal Properties for Magnetic Fe3O4-Coated SiC-Filled Epoxy Composites

“…With the development of UHV transmission technology, the reliability requirements for the electrical equipment in AC/DC transmission systems with different voltage levels have become more and more strict [ 1 , 2 , 3 ]. High-voltage high-power electronic devices (such as IGBT and IGCT) are the core components for manufacturing various high-voltage large-capacity power converters and control equipment [ 4 ].…”

Performance of Silicone Rubber Composites Filled with Aluminum Nitride and Alumina Tri-Hydrate

“…Therefore, alternative filler materials including boron nitride (BN), mica, aluminum oxide, etc. have been sought to replace ATH in high voltage SR composite insulators [15][16][17][18][19].…”

“…By incorporating 7 wt.% thermally conductive BN particles in the SR composites, Du et al [20] found an improvement in the thermal dissipation and a decrease in both erosion depth and weight loss, indicating improved electrical erosion resistance. By the addition of mica modified by polydopamine and silane coupling agents, Liao et al [16] reported SR composites with~43% higher breakdown strength as compared to that of the ATH-filled SR composites. Aluminum nitride (AlN) is a thermally conductive material with a combination of good electrical insulation ability and low dielectric loss, which is desired for applications in high voltage insulation.…”