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Thermally Self-Healable Titanium Dioxide/Polyurethane Nanocomposites with Recoverable Mechanical and Dielectric Properties

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Abstract

Dielectric materials with self-healing property after the occurrence of detrimental events such as tearing or scratch are highly desired, which guarantees reliability and lifetime of the electric and electronic systems. Here, a self-healing covalently bonded titanium dioxide/polyurethane (TiO2/PU) nanocomposite with enhanced dielectric constant was prepared by in-situ polymerization based upon Diels-Alder reaction. The PU prepolymer was prepared from TiO2, poly(tetramethylene glycol) and 4,4-diphenylmethane diisocyanate. Then the linking between the prepolymer and Diels-Alder adducts of bifunctional maleimide blocked by furfuryl alcohol was carried out. The in-situ polymerization method allows the TiO2 filler, the PU polymer matrix, and the DA healing portion to be tightly connected, resulting in a stable nanocomposite system. Due to the reversibility of covalent bonds, the TiO2/PU nanocomposites exhibited thermal self-healing properties after being cut. The dielectric constant and loss, mechanical properties can be effectively restored to their original state after damage.

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Authors and Affiliations

  1. Shenzhen Institute of Advanced Electronic Materials, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, 518055, P. R. China

    Xudong Wu, Jingyu Huang, Shuhui Yu, Panpan Ruan & Rong Sun

  2. Nano Science and Technology Institute, University of Science and Technology of China, Suzhou, 215123, P. R. China

    Xudong Wu, Jingyu Huang & Panpan Ruan

  3. School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA, 30332, USA

    Ching-Ping Wong

Authors
  1. Xudong Wu
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  2. Jingyu Huang
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  3. Shuhui Yu
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  4. Panpan Ruan
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  5. Rong Sun
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  6. Ching-Ping Wong
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Correspondence to Shuhui Yu or Rong Sun.

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Acknowledgments: This work was financially supported by the National Natural Science Foundation of China (51777209), National Key R&D Project from Minister of Science and Technology of China (2017YFB0406300), Shenzhen Key Fundamental Research Program (JCYJ20160608160307181) and Shenzhen Peacock Program (KQJSCX20170731163718639).

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Wu, X., Huang, J., Yu, S. et al. Thermally Self-Healable Titanium Dioxide/Polyurethane Nanocomposites with Recoverable Mechanical and Dielectric Properties. Macromol. Res. 28, 373–381 (2020). https://doi.org/10.1007/s13233-020-8049-5

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  • DOI: https://doi.org/10.1007/s13233-020-8049-5

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