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Dielectric and Breakdown Properties of MWCNT- and OMMT-Reinforced Epoxy Composites

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Abstract

Development of the power industry, especially in the field of high-power electricity, is limited by the insulating materials. The main problem of power generation equipment, especially ultra-high-voltage and high-power equipment, is the ability of insulating materials to withstanding voltage. Epoxy resin (EP) is widely used in the power industry. Therefore, it is necessary to improve the performance of EP and demonstrate an energy model of material electrical breakdown. EP has excellent insulation properties, yet poor toughness. By doping with nanomaterials, the toughness of the matrix can be improved on the premise of having little influence on insulation performance. In this paper, two kinds of nanomaterials were added into the matrix, namely multi-walled carbon nanotubes (MWCNTs) and organically modified montmorillonite (OMMT). MWCNTs are conductive, and the insulation properties of EP will be adversely affected if doped in large quantities. OMMT is a nanomaterial with lamellar structure. The toughness of EP can be improved by being doped with OMMT without adverse effect on the insulation performance. Various factors affecting the electric field strength and dielectric properties are analyzed, and models of electric and thermal breakdown are established. In addition, by observing the phenomena of material after breakdown, the energy relation equation of breakdown is re-established.

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Acknowledgments

Funding for this research was supported by the State Key Laboratory of Robotics (Grant No. 2019-003).

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Authors and Affiliations

  1. Department of Astronautical Science and Mechanics, Harbin Institute of Technology (HIT), P.O. Box 301, No. 92 West Dazhi Street, Harbin, 150001, People’s Republic of China

    Zhaokun Ren, Liwu Liu & Yanju Liu

  2. Department of Polymer Materials Science and Engineering, Harbin University of Science and Technology (HUST), No. 4 Yuanlin Street, Harbin, 150040, People’s Republic of China

    Zhaokun Ren & Mingyan Zhang

  3. Centre for Composite Materials and Structures, Harbin Institute of Technology, Harbin, 150080, People’s Republic of China

    Jinsong Leng

  4. State Key Laboratory of Robotics, Shenyang Institute of Automation, Chinese Academy of Sciences, Shenyang, 110016, People’s Republic of China

    Liwu Liu

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  1. Zhaokun Ren
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  2. Liwu Liu
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  3. Mingyan Zhang
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  4. Yanju Liu
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  5. Jinsong Leng
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Correspondence to Liwu Liu or Mingyan Zhang.

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Ren, Z., Liu, L., Zhang, M. et al. Dielectric and Breakdown Properties of MWCNT- and OMMT-Reinforced Epoxy Composites. J. Electron. Mater. 48, 7270–7281 (2019). https://doi.org/10.1007/s11664-019-07543-6

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  • DOI: https://doi.org/10.1007/s11664-019-07543-6

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