Three-dimensional graphene architecture reinforced epoxy composite with double-sided adhesive molybdenum disulfide transition interlayer for maintaining excellent interfacial and tribological properties

Three-dimensional graphene architecture (3DGA) as reinforcement with successive reinforcement effect has attracted intense attention in the field of polymer composites, while 3DGA also faces the disadvantages of weak interfacial adhesion with matrices. The surface decoration of 3DGA with molybdenum disulfide (3DGA@MoS 2 ) further promoted the diffusion and penetration of epoxy molecular for 3DGA network with the aid of resin transfer molding (RTM) technic. The MoS 2 transition nanolayer not only forms covalent bonding with 3DGA but mechanical interlocks with epoxy, which effectively improved the interface combination in composite. Compared with neat epoxy, the glass transition temperature ( T g ) and tensile strength increased by 18°C and 58.6%, as well as the average friction coefficient and wear rate decreased by 84% and 89%, respectively, by low loading of only 2 wt% 3DGA@MoS 2 . Hence, the 3D graphene modified strategy by surface decoration provides a new insight for manufacturing high-performance epoxy-graphene composites with excellent tribological properties. Highlights A highly ordered and interconnected 3DGA reinforcement was fabricated. MoS 2 serves as interlayer, forming covalent bond and mechanical interlock. Incorporation of 3DGA@MoS 2 enables rapid heat conduction and load transfer. Bi-interpenetrating 3D structure/polymer network endows good wear resistance. Improved comprehensive properties ascribe to strong interface adhesion.