Electrical Tree Performance in Epoxy Resin under Low-Frequency Bipolar Square- Wave Voltage

Zhang, Chuang; Fu, Hong; Xing, Zhaoliang; Guo, Shengming; Cui, Huize; Wang, Shihang; Li, Jianying

doi:10.1007/s11664-022-09771-9

Cited by 2 publications

(1 citation statement)

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“…Polymer-based dielectrics have shined dazzling light in the twenty-first century for the advantages of low cost, lightweight, plasticity, high performances, etc., and thus are widely accepted for electrical equipment and electronic devices. , Nowadays, the rapid development of power devices with high integration and miniaturization puts severe challenges to the electrical insulation properties of organic dielectrics, , that is to endure greater voltages with thinner thicknesses. As one of the mainstream polymers used in power devices, epoxy resin (EP) is encountering the torment of inferior breakdown strength, which is the critical barrier restricting the development of advanced EP-based devices. − Therefore, to break the bottleneck of developing advanced power devices, it is urgent to exploit EP polymers with a greater breakdown strength.…”

Section: Introductionmentioning

confidence: 99%

Constructing Fluorine Hybrid Epoxy Polymers with Excellent Breakdown Strength by Surface Fluorination

Li,

Shang,

Zhao

et al. 2023

ACS Appl. Polym. Mater.

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The inferior breakdown strength of epoxy resin (EP) is one of the greatest barriers which restricts the evolution of advanced electrical equipment and electronic devices. It had been reported that constructing fluorine hybrid polymers was successful in improving the breakdown strength of organic dielectrics. Therefore, in this study, we constructed fluorine hybrid EP with a satisfactory breakdown strength by surface fluorination. It was found experimentally that the fluorination introduced CF n groups into EP molecules and contributed to a greater trap level and breakdown strength. After fluorination at 80 °C for 1 h, the CF 3 fraction in fluorinated EP was 14.31%, and the breakdown strength was increased by 27.64%, from 427.87 to 546.13 kV/mm. The density functional theory simulations showed that the CF 3 groups increased the maximum of positive Mulliken charge (MPMC) of EP molecules. Compared to pristine EP, after introducing CF 3 groups, the MPMC was increased from 0.655 to 0.973 eV, which was instrumental in constructing electron traps with a greater level. Thus, the charge transport process in fluorinated EP was repressed and contributed to the superior breakdown strength. This study proposed a strategy to exploit EP polymers with greater breakdown strength and could promote the development of advanced insulation dielectrics for power devices.

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