Healing is a vital factor of polymer materials. Herein, an investigation on the healing performance of Graphene-CNTs reinforced thermoplastic polyurethane (TPU) composites induced by microwave was carried out. The results show that the graphene sheet and CNTs formed a combined structure of Graphene-CNTs. This Graphene-CNTs may have a synergy effect on the coupling between microwave and Graphene-CNTs on the interface, and promote the fully healing of damaged composites. The tensile strength of the healed composites even exceeds the value of the virgin specimens. Simultaneously, there is a microwave focusing effect within the region of crack, and on the surfaces of graphene or CNTs that exposed on the fracture surfaces. This effect will also promote the healing of damaged composites, and can realize the preferential healing of crack as compared with the non-damaged regions. These results may help us to get a deeper understanding of healing mechanisms of some thermoplastic composites.

修复是聚合物材料的重要因素。在此，研究了由微波诱导的石墨烯-CNTs增强热塑性聚氨酯（TPU）复合材料的愈合性能。结果表明，石墨烯片和碳纳米管形成了石墨烯-碳纳米管的复合结构。该石墨烯-CNT可对界面上的微波和石墨烯-CNT之间的偶联产生协同作用，并促进受损复合材料的完全愈合。修复后的复合材料的拉伸强度甚至超过了原始样品的值。同时，在裂纹区域内以及暴露在断裂表面上的石墨烯或CNT的表面上存在微波聚焦效应。这种效果还可以促进受损复合材料的愈合，与未损坏区域相比，可以实现裂纹的优先修复。这些结果可能有助于我们更深入地了解某些热塑性复合材料的愈合机理。