Carbon nanotubes (CNTs) were added into the self-healing polyurethane materials as conductive filler, the mass fraction of carbon nanotubes was adjusted, and 1% polyaniline was doped. The conductive self-healing polyurethane composites with different carbon nanotubes content (PU)-1/3/5/8/10 were prepared, and analyzed and tested. The result shows that the permeability threshold value of the composite material is 8wt%, and the comprehensive performance of the composite material PU-8 is the best; the resistance of PU-8 is 1278Ω, PU-8P has a resistance of 1400Ω; using an infrared camera, it can be seen that the material can reach 143.3 °C under the DC current of 0.1A, reaching the temperature condition when the material is repaired; the swelling test shows that the PU-8P equilibrium swelling rate is 177%, the gel content is 52.67%, and there is no dissolution in dimethyl sulfoxide. Solvent stability is better than PU-8;DSC test shows that the glass transition temperature of the soft segment of PU-8P is 43 °C, and the glass transition temperature of the hard segment is − 55 °C, which is not much different from that of PU-8; TG test shows that the epitaxial starting temperature of PU-8P is 365 °C; the observation photo is magnified by a stereo microscope at ten times and the PU-8P sample is cut of in the middle at room temperature, applying a constant voltage of 30 V, the cracks disappeared. The material cracks realized self-healing with electricity, and the repair efficiency reached 20.5%.

    Abstract
    1 Introduction
    2 Experimental section
        2.1 Materials
        2.2 Sample preparation
    3 Results and discussion
        3.1 Infrared spectroscopy analysis of dimethyl succinate, succinic dihydrazide, VSD
        3.2 NMR analysis of VSD and succinic dihydrazide
        3.3 Characterization of resistance value and electric heating performance
        3.4 Analysis of mechanical properties and self-healing properties
        3.5 SEM analysis of conductive polyurethane cross section
        3.6 Thermal analysis performance test
        3.7 Determination of equilibrium swelling rate and gel content
    4 Conclusions
    References

• Qi Xu(Key Laboratory of Rubber‑Plastics, Ministry of Education, Shandong Provincial Key Laboratory of Rubber‑Plastics, School of Polymer Science and Engineering, Qingdao University of Science & Technology)
• Yang Liu(Key Laboratory of Rubber‑Plastics, Ministry of Education, Shandong Provincial Key Laboratory of Rubber‑Plastics, School of Polymer Science and Engineering, Qingdao University of Science & Technology)
• Yu Chen(Key Laboratory of Rubber‑Plastics, Ministry of Education, Shandong Provincial Key Laboratory of Rubber‑Plastics, School of Polymer Science and Engineering, Qingdao University of Science & Technology)
• Zhaoyang Zhang(Key Laboratory of Rubber‑Plastics, Ministry of Education, Shandong Provincial Key Laboratory of Rubber‑Plastics, School of Polymer Science and Engineering, Qingdao University of Science & Technology)
• Yan Yan Wei(Key Laboratory of Rubber‑Plastics, Ministry of Education, Shandong Provincial Key Laboratory of Rubber‑Plastics, School of Polymer Science and Engineering, Qingdao University of Science & Technology)