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<p>Epoxy insulating materials are widely used in electrical equipment, yet their sustainable development is hindered by challenges such as difficulty in recycling after decommissioning and the inability to repair micro-damage during operation. The integration of dynamic covalent bonds into epoxy networks offers an innovative way to overcome these limitations. Unlike previous reviews that focus primarily on synthetic chemistry, this work centers on the application requirements of power insulation and systematically reviews molecular engineering strategies for degradable epoxy materials based on imine and disulfide bonds. It highlights how these two types of dynamic bonds enable distinct pathways-hydrolysis and exchange mechanisms-to impart controllable degradation, self-healing, and reprocessing capabilities. The review further examines the influence of dynamic networks on key insulation properties, including dielectric behavior, breakdown strength ,20%-30% higher than that of conventional epoxy, electrical tree inhibition, and mechanical toughness. Typical performance indicators, such as a tunable glass transition temperature ranging from 80 to 120&#xa0;°C and a healing efficiency exceeding 95%, are also discussed. Finally, the potential of these materials to support the green transformation and intelligent maintenance of power equipment is explored, along with critical challenges and future directions under the complex operating conditions of next-generation power grids.</p>

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Research progress on imine bonds and disulfide bonds in degradation and performance regulation of epoxy resins

  • 期刊论文

  • 发表日期：

    2026年4月28日

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  • Zhongbing Duan,
  • Jinxin Huang,
  • Li Zhang,
  • Guan Wang

摘要

Epoxy insulating materials are widely used in electrical equipment, yet their sustainable development is hindered by challenges such as difficulty in recycling after decommissioning and the inability to repair micro-damage during operation. The integration of dynamic covalent bonds into epoxy networks offers an innovative way to overcome these limitations. Unlike previous reviews that focus primarily on synthetic chemistry, this work centers on the application requirements of power insulation and systematically reviews molecular engineering strategies for degradable epoxy materials based on imine and disulfide bonds. It highlights how these two types of dynamic bonds enable distinct pathways-hydrolysis and exchange mechanisms-to impart controllable degradation, self-healing, and reprocessing capabilities. The review further examines the influence of dynamic networks on key insulation properties, including dielectric behavior, breakdown strength ,20%-30% higher than that of conventional epoxy, electrical tree inhibition, and mechanical toughness. Typical performance indicators, such as a tunable glass transition temperature ranging from 80 to 120 °C and a healing efficiency exceeding 95%, are also discussed. Finally, the potential of these materials to support the green transformation and intelligent maintenance of power equipment is explored, along with critical challenges and future directions under the complex operating conditions of next-generation power grids.