Voltage-Stabilizer-Grafted SiO2 Increases the Breakdown Voltage of the Cycloaliphatic Epoxy Resin

Yi Qin; Shudong Zhang; Shuai Han; Tingting Xu; Cui Liu; Min Xi; Xinling Yu; Nian Li; Zhenyang Wang

doi:10.1021/acsomega.1c02108

Voltage-Stabilizer-Grafted SiO₂ Increases the Breakdown Voltage of the Cycloaliphatic Epoxy Resin

ACS Omega. 2021 May 31;6(23):15523-15531. doi: 10.1021/acsomega.1c02108. eCollection 2021 Jun 15.

Authors

Yi Qin^{1

2}, Shudong Zhang^{1

3}, Shuai Han^{1

2}, Tingting Xu^{1

2}, Cui Liu^{1

3}, Min Xi^{1

3}, Xinling Yu^{1

3}, Nian Li^{1

3}, Zhenyang Wang^{1

3}

Affiliations

¹ Institute of Solid State Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, Anhui 230031, China.
² Department of Chemistry, University of Science and Technology of China, Hefei 230026, China.
³ Key Laboratory of Photovoltaic and Energy Conservation Materials, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China.

Abstract

Cycloaliphatic epoxy (CE) resin plays a vital role in insulation equipment due to its excellent insulation and processability. However, the insufficient ability of CE to confine electrons under high voltage often leads to an electric breakdown, which limits its wide applications in high-voltage insulation equipment. In this work, the interface effect of inorganic nano-SiO₂ introduces deep traps to capture electrons, which is synergistic with the inherent ability of the voltage stabilizer m-aminobenzoic acid (m-ABA) to capture high-energy electrons through collision. Therefore, the insulation failure rate is reduced owing to doping of the functionalized nanoparticles of the m-ABA-grafted nano-SiO₂ (m-ABA-SiO₂) into the CE. It is worth noting that the breakdown field strength of this m-ABA-SiO₂/CE reaches 53 kV/mm, which is 40.8% higher than that of pure CE. In addition, the tensile strength and volume resistivity of m-ABA-SiO₂/CE are increased by 29.1 and 140%, respectively. Meanwhile, the glass transition temperature was increased by about 25 °C and reached 213 °C. This work proves that the comprehensive performance of CE-based nanocomposites is effectively improved by m-ABA-SiO₂ nanoparticles, showing great application potential in high-voltage insulated power equipment.