Chinese Journal of Applied Chemistry ›› 2020, Vol. 37 ›› Issue (10): 1147-1155.DOI: 10.11944/j.issn.1000-0518.2020.10.200112

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Preparation and Characterization of Hydrogen-Bonded Carbon Nanotubes Reinforced Self-healing Composites

CHENG Yinjie, ZHANG Lu, HU Renjie, WANG Ying, JIN Xuexin, QIU Shuo, ZHANG Haoyan, JIANG Dawei*   

  1. Heilongjiang Key Laboratory of Molecular Design and Preparation of Flame Retardant Materials,Chemical Engineering and Resource Utilization,Northeast Forestry University,Harbin 150040,China
  • Published:2020-10-01 Online:2020-09-30
  • Contact: JIANG Dawei, lecturer; Tel:0451-82135637; E-mail:sharkwei12345@163.com; Research interests:design and preparation of self-healing materials
  • Supported by:
    Supported by the Fundamental Research Funds for the Central Universities(No.2572018BC27), the Project of Heilongjiang Provincial Youth Science Foundation(No.QC2017038), Heilongjiang Province Postdoctoral Special Funding(No.LBH-TZ13), Heilongjiang Provincial Government Postdoctoral Grants(No.LBH-Z16004) and China Postdoctoral Science Foundation Grant(No.2016M601402)

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 properties and can self-heal at room-temperature (30 ℃). The mechanism of self-healing was proposed in the paper. The stress-strain tests were performed on self-healing composites with different amounts of carbon nanotubes. It is found that the stress and the strain of the composites increases with the increased addition of carbon nanotubes. The stress of composites can reach 4 MPa and the strain increases more than 6% as 9% (mass fraction) of carbon nanotubes is 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 show that carbon nanotubes have good compatibility with the material, and the morphologies of the surface and fracture surface of the cut composites are similar. The self-healing efficiency of composites can reach 100% at room temperature for 24 h. The self-healing efficiency is more than 90% after 10 fracture-healing cycles. The composites have excellent thermal stability, and the temperature at the maximum mass 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