Cutting-edge technologies of wearable electronics have recently attracted tremendous attention. One of the key issues lies in the choice of compliant and environmental-friendly materials and cost-effective fabrication methods. We here report a rehealable and highly stretchable wearable strain sensing system enabled by advanced materials. By embedding patterned liquid metal (LM) line traces into dynamic covalent thermoset polyimine through a low-cost fabrication method, a mechanically flexible and electrically sensitive strain sensor is obtained. We proposed an analytical model based on length fractions of the strain sensor to describe the resistance change under applied strain. The results show good agreement with finite element simulation and experiment. Because of the bond exchange reactions in polyimine and the flowability of LM, the sensing system has excellent rehealability when it is damaged. These superior properties make the strain sensor quantitatively precise, economically friendly and environmentally sustainable, and thus can find wide applications in various areas.

可穿戴电子产品的尖端技术最近引起了极大的关注。关键问题之一在于选择合规且环保的材料和具有成本效益的制造方法。我们在此报告了一种由先进材料实现的可修复且高度可拉伸的可穿戴应变传感系统。通过低成本的制造方法将带图案的液态金属 (LM) 线迹嵌入动态共价热固性聚亚胺中，获得了机械柔性和电敏应变传感器。我们提出了一个基于应变传感器长度分数的分析模型来描述施加应变下的电阻变化。结果表明与有限元模拟和实验非常吻合。由于聚亚胺中的键交换反应和 LM 的流动性，传感系统在损坏时具有出色的可恢复性。这些优越的特性使应变传感器在定量上精确、经济友好且环境可持续，因此可以在各个领域得到广泛应用。