Polyurethane graphene nanocomposites with self-healing properties by azide-alkyne click reaction


Akhan S., Oktay B. , Özdemir O. K. , Madakbaş S. , Kayaman Apohan N.

Materials Chemistry and Physics, vol.254, 2020 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 254
  • Publication Date: 2020
  • Doi Number: 10.1016/j.matchemphys.2020.123315
  • Title of Journal : Materials Chemistry and Physics

Abstract

Nanocomposites stand out as promising materials in many fields due to their properties such as strength, hardness, thermal stability, and lightness. Introducing self-healing ability to polymer nanocomposites provides new guidelines for strong, sustainable, and durable materials. Microcapsule-based self-healing materials work independently of an external stimulus such as pH, heat, light and solvent. In this paper, we developed autonomously self-healing UV-cured polyurethane graphene oxide nanocomposite coatings by means of efficient and useful copper-catalyzed azide-alkyne (CuAAC) click chemistry. Low molecular weight tetra-arm azide was successfully capsulated within poly(vinyl formal) capsules. Alkyne functional graphene-oxide reinforced nanocomposites containing azide microcapsules were prepared through photo-polymerization. The self-healing ability and anti-corrosion properties of the nanocomposites were studied after the damage occurred. The self-healing experiments show that the microcapsules provided a self-healing efficiency of around 70% after 24 h. Chemical, morphologic, mechanical, and thermal properties of the films were investigated. Furthermore, the electrochemical analysis of films showed that the microcapsule containing films has a higher polarization resistance and a lower corrosion current.