The compatibility between PEK-C and graphite has a significant impact on the ultimate composites performance. In this work, an effective and low-cost technique, combing bio-inspired dopamine polymerization and silane coupling agents grafting, was presented to improve the interfacial strength of graphite with PEK-C. As a result, the bonding strength of the composite was obviously superior to that of the non-treated and polydopamine-coated only, which was confirmed by SEM, DHR, and DSC experiments. Other characterizations indicated that the chemically modified graphite played the role of a toughening agent to improve the toughness of PEK-C/ graphite composites. Moreover, friction tests also displayed that the modified PEK-C/graphite composites exhibited enhanced tribological properties under different test conditions. When the linear velocity was 2.24 m/s, the dry friction coefficient of CS-6 was 0.1757, which was about 42% lower than the friction coefficient of the pure graphite-filled composite. In addition, the mass wear ratio of CS-6 composite was 0.054 wt.% under dry friction, which was 74% lower than CS-3. To sum up, the research not only proved the importance of interfacial strength to the frictional properties but also proposed a method to modify the interfacial interaction force of composites.
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