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Self-healing of mechanical damage of polyethylene/microcapsules electrical insulation composite material

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Abstract

Polyethylene (PE) cable has become an important carrier of the modern power grid due to its excellent electrical insulation performance. However, small damages can inevitably occur during the preparation and operation of the materials, which can distort electric field and trigger discharge, seriously threatening power supply safety. The self-healing of insulation materials by doping microcapsules is a new research innovation. In this paper, the self-healing PE/microcapsules insulation composite material was prepared, and the self-healing behavior of mechanical damage was emphatically analyzed by scratch damage test and crack propagation simulation. The results show that the composite material with 1 wt% microcapsule has better insulation strength. Moreover, the composite material can fill the defective structures, restore local electrical properties, and reverse the deterioration process of the material. The properties of PE/microcapsules composite material are mainly related to the characteristics of the microcapsule itself and the interface introduced by the microcapsules. The properties of the repaired product can directly affect the recovery degree of the damaged area. The stress action during damage can smoothly trigger its self-healing behavior. In conclusion, the PE composite material doped with 1 wt% microcapsules can achieve a good self-healing effect on mechanical damage.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant No. 51777018), the Science and Technology Project of SGCC (Project No. SGTYHT/14-JS-188), and the Fundamental Research Funds for the Central Universities (Project No. 2019CDJGFDQ002).

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Authors and Affiliations

  1. State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing, 400044, China

    Yanfang Zhang, Youyuan Wang, Zhengyong Huang, Rongliang Zheng & Yaxiong Tan

  2. State Grid Shandong Electric Power Company Weifang Power Supply Company, Weifang, 261021, Shandong Province, China

    Yudong Li

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  1. Yanfang Zhang
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  2. Youyuan Wang
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  3. Yudong Li
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  5. Rongliang Zheng
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  6. Yaxiong Tan
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Contributions

Conceptualization: [YZ], [YW]; Methodology: [YZ], [YL], [RZ]; Data curation: [YZ], [YL], [RZ]; Formal analysis: [YZ], [YL], [RZ]; Investigation: [YZ], [YL], [RZ]; Writing–original draft: [YZ]; Writing–review & editing: [YW]; Visualization: [YZ]; Supervision: [YW], [ZH], [YT]; Project administration: [YW], [ZH], [YT]; Funding acquisition: [YW], [ZH], [YT]; Resources: [YW], [ZH], [YT].

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Correspondence to Youyuan Wang.

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Zhang, Y., Wang, Y., Li, Y. et al. Self-healing of mechanical damage of polyethylene/microcapsules electrical insulation composite material. J Mater Sci: Mater Electron 32, 26329–26340 (2021). https://doi.org/10.1007/s10854-021-06953-9

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  • DOI: https://doi.org/10.1007/s10854-021-06953-9

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