▎ 摘　　要

Stretchable conductors are susceptible to wear through repeated deformation over time. Stretchable conductors with self-healing properties can increase longevity and reduce safety hazards. However, most current self-healing conductors can only repair either the conductive layer or the insulating layer. Meantime, high mechanical robustness and self-healing efficiency are exclusive especially at ambient conditions. Realizing a stretchable conductor with integral self-healing and ultra-high mechanical strength is challenging, because this requires good interfacial compatibility and adaptability of the conductive and insulating layers. We adapt a biphasic dynamic network strategy to add toughness to self-healing materials. The DOU (dimethylglyoxime-urethane polyurethane) dynamic bonds and hydrogen bonds in the soft phase enable high self-healing efficiency, while the graphene as a hard phase supports the material's superior mechanical properties. We have prepared an overall self-healing stretchable conductor through the soft phase as a self-encapsulating insulating layer. This all-solid (Tg = -49.5 degrees C) graphene/dimethylglyoxime-urethane polyurethane (Gr/DOU-PU) composites characteristic of both high mechanical strength (similar to 6 MPa, similar to 1000%, similar to 48 MJ m(-3)), self-healing conductivity (similar to 90%, 10 min, 25 degrees C) and conductivity (R rectangle=47.8 Omega rectangle(-1), d = 0.4 mm). The conductor has excellent stability for flexible electronics and for building stress sensors. (C) 2021 Elsevier Inc. All rights reserved.