화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Macromolecular Research, Vol.28, No.4, 373-381, April, 2020
DOI10.1007/s13233-020-8049-5  Export Citation
Thermally Self-Healable Titanium Dioxide/Polyurethane Nanocomposites with Recoverable Mechanical and Dielectric Properties
Xudong Wu1, 2, Jingyu Huang1, 2, Shuhui Yu1, †, Panpan Ruan1, 2, Rong Sun1, †, and Ching-Ping Wong3
  • 1Shenzhen Institute of Advanced Electronic Materials, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, 518055, P. R. China
  • 2Nano Science and Technology Institute, University of Science and Technology of China, Suzhou, 215123, P. R. China
  • 3School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
E-mail:,
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.
Keywords:dielectric materials;self-healing;TiO2/PU nanocomposites;diels-alder chemistry
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