It has been a challenge to improve the performance of epoxy insulation in the whole life cycle by achieving the reduction of residual stress during manufacturing, the healing of damages during application, and the recycling after decommissioning. In this paper, a novel recyclable epoxy resin (SEP) with releasable residual stress and synergistically enhanced dielectric properties and healing ability was successfully developed by introducing dynamic thiocarbamate bonds (DTBs). A reduction in residual stresses by 45 % was detected after SEP was annealed at 30 °C below the glassy transition temperature (Tg) for 8 h, during which the mechanical properties remained unchanged. Synergistically improved dielectric properties and damage-healing ability were also observed in SEP. A high healing efficiency of 94.4 % for electrical breakdown damage was found in SEP, meanwhile its dielectric properties were superior to commercial epoxy resin. Additionally, SEP featured good recyclability, including reprocessability and degradability. All those excellent properties were ascribed to the dissociation and recombination of DTBs triggered by thermal stimulation. This work provides an effective solution to a series of issues throughout the full lifecycle of epoxy materials.

中文翻译：

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新型可回收环氧树脂，具有可释放残余应力并协同增强介电性能和愈合能力


通过实现制造过程中残余应力的降低、使用过程中损伤的修复以及退役后的回收利用，提高环氧绝缘材料全生命周期的性能一直是一个挑战。本文通过引入动态硫代氨基甲酸酯键（DTB）成功开发了一种新型可回收环氧树脂（SEP），该树脂具有可释放残余应力、协同增强介电性能和愈合能力。 SEP 在低于玻璃化转变温度 (Tg) 30 °C 的温度下退火 8 小时后，残余应力降低了 45%，在此期间机械性能保持不变。 SEP 还观察到介电性能和损伤修复能力的协同改善。 SEP对电击穿损伤的修复效率高达94.4%，同时其介电性能优于商业环氧树脂。此外，SEP具有良好的可回收性，包括可再加工性和可降解性。所有这些优异的特性都归因于热刺激引发的 DTB 的解离和重组。这项工作为环氧材料全生命周期的一系列问题提供了有效的解决方案。