J. Mater. Sci. Technol. ›› 2023, Vol. 136: 13-20.DOI: 10.1016/j.jmst.2022.07.019

• Review Article • Previous Articles     Next Articles

Polydopamine/polyethyleneimine co-crosslinked graphene oxide for the enhanced tribological performance of epoxy resin coatings

Shaofeng Zhoua,*, Jin Yana, Jialin Chenc, Huimin Yana,d, Yin Zhanga, Jin Huange, Guizhe Zhaoa, Qiaoxin Zhangb,*, Yaqing Liua,*   

  1. aShanxi Province Key Laboratory of Functional Nanocomposites, and School of Materials Science and Engineering, North University of China, Taiyuan 030051, China;
    bSchool of Mechanical and Electronic Engineering, Wuhan University of Technology, Wuhan 430070, China;
    cQueen Marry University of London Engineering School, Northwestern Polytechnical University, Xi'an 710129, China;
    dSouthwest Technology and Engineering Research Institute, Chongqing 400039, China;
    eSchool of Chemistry and Chemical Engineering, and Chongqing Key Laboratory of Soft-Matter Material Chemistry and Function Manufacturing, Southwest University, Chongqing 400715, China
  • Received:2022-06-20 Revised:2022-07-06 Accepted:2022-07-08 Published:2023-02-10 Online:2022-08-17
  • Contact: * E-mail addresses: zhoushaofeng@nuc.edu.cn (S. Zhou), zhangqx@whut.edu.cn (Q. Zhang), lyq@nuc.edu.cn (Y. Liu).

Abstract: To enhance the wear resistance of graphene oxide (GO) nano-filled epoxy resin (EP) coatings with excellent dispersion, GO were modified using a co-crosslinking strategy between polydopamine (PDA) and polyethyleneimine (PEI) through an environmentally friendly, simple and low-cost process. High-density amino-branched PEI and highly adhesive PDA formed covalent bond cross-links with GO (PDA/PEI-GO) through the Michael addition and Schiff base reactions. With the introduction of amino active sites, the PDA self-polymerization reaction time was significantly shorted from 24 to 6 h. The covalently cross-linked network increased the lamellar spacing of GO and enhanced the interfacial bonds between the PDA/PEI-GO lamellae and EP matrix. Due to the improved dispersion and surface activity of GO, the PDA/PEI-GO nano-filled EP coating exhibited excellent wear resistance. Reciprocating friction with GCr15 stainless steel ball, the average friction coefficient and wear rate of the coating were reduced by 31.9% and 62.7%, respectively, compared to the pure EP coating. In addition, the wear mechanism of the PDA/PEI-GO/EP coating changed from adhesive and fatigue wear to abrasive wear, and it maintained good wear resistance by forming a GO lubrication transfer film on the counterpart surface. Therefore, this study may provide a new strategy for improving the dispersion of graphene in wear-resistant polymer materials for practical applications.

Key words: Graphene oxide, Co-crosslinking, Epoxy coatings, Tribological properties