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

作　　者：Shaofeng Zhou Jin Yan Jialin Chen Huimin Yan Yin Zhang Jin Huang Guizhe Zhao Qiaoxin Zhang Yaqing Liu 

机构地区：[1]Shanxi Province Key Laboratory of Functional Nanocomposites,and School of Materials Science and Engineering,North University of China,Taiyuan 030051,China [2]School of Mechanical and Electronic Engineering,Wuhan University of Technology,Wuhan 430070,China [3]Queen Marry University of London Engineering School,Northwestern Polytechnical University,Xi’an 710129,China [4]Southwest Technology and Engineering Research Institute,Chongqing 400039,China [5]School of Chemistry and Chemical Engineering,and Chongqing Key Laboratory of Soft-Matter Material Chemistry and Function Manufacturing,Southwest University,Chongqing 400715,China

出　　处：《Journal of Materials Science & Technology》2023年第5期13-20,共8页材料科学技术（英文版）

基　　金：This work was financially supported by the Shanxi Province Science and Technology Major Project for New Materials Tech-nology(No.20181102014);the Shanxi Province 1331 Project Key Innovation Team of Polymeric Functional New Materials,the Natural Science Foundation of Shanxi Province of China(No.20210302123036);the Program for the Excellent Young Aca-demic Leaders of Higher Learning Institutions of Shanxi Province.

摘　　要：To enhance the wear resistance of graphene oxide(GO)nano-filled epoxy resin(EP)coatings with ex-cellent 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 Schiffbase 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.

关 键 词：Graphene oxide Co-crosslinking Epoxy coatings Tribological properties 

分 类 号：TB306[一般工业技术—材料科学与工程]