Abstract: The hydrogen-bonded self-healing composites were manufactured successfully (dimer acid, diethylenetriamine, and urea as raw materials, and carbon nanotubes as reinforcing agents). The composites have good mechanical and could be self-healing at room-temperature properties (30℃). The mechanism of self-healing has been reasonably speculated in the paper. The stress-strain tests were performed on self-healing composites with different amounts of carbon nanotubes. It was found that the stress and strain of the composites were increased with the increase addition of carbon nanotubes. The stress of composites could be reached 4 MPa and the strain was increased more than 6 % as 9 % mass fraction of carbon nanotubes were added into the composites. The surface morphology, self-repairing performance and thermal stability of the self-healing composites with 9 % mass fraction of carbon nanotubes were tested. The results showed that carbon nanotubes have good compatibility with the material, and the surface and fracture surface morphology of the cut composites are similar. The self-healing efficiency of composites could be reached 100% at room temperature for 24 h. The self-healing efficiency was more than 90% after 10 fracture-healing cycles. The composites had excellent thermal stability, and the temperature at the maximum weight loss rate is 474℃. The composites provide an option for next-generation skin sensors and wearable smart devices.

Key words: self-healing polymer, carbon nanotubes, hydrogen bonds