Polypyrrole nanoparticles (PPy) are widely used in cancer treatment because of its excellent photo-thermal effect. To our best knowledge, the application of such property in self-healing polymers have rarely been reported. Here, thermoplastic polyurethanes (TPU) were prepared by two-step method, and then TPU/PPy nanocomposites were prepared by solution blending. The stress and strain of TPU were increased from 8.20 MPa to 1540% to 13.50 MPa and 1650% with 0.25 wt% PPy respectively. Meanwhile, the thermal stability was also improved significantly. After the composite film was cut and spliced together, the fracture was irradiated with NIR, the mechanical strength of the composite material could be restored to over 80% in only 30 s. The strengthening effect of PPy in polyurethane and the rapid repair performance of composite materials can well solve the contradiction that self-repairing materials cannot improve the repair efficiency and mechanical properties simultaneously, and at the same time broaden the application area of PPy.

聚吡咯纳米颗粒（PPy）由于其出色的光热效应而被广泛用于癌症治疗。据我们所知，这种性质在自愈聚合物中的应用鲜有报道。在此，通过两步法制备热塑性聚氨酯（TPU），然后通过溶液共混制备TPU / PPy纳米复合材料。使用0.25 wt％的PPy时，TPU的应力和应变分别从8.20 MPa增加到1540％，13.50 MPa和1650％。同时，热稳定性也显着提高。将复合膜切割并拼接在一起后，用NIR辐照断裂，复合材料的机械强度仅30秒即可恢复到80％以上。