摘要
Polytetrafluoroethylene (PTFE) is widely used, but is limited in tribology owing to its poor mechanical properties and wear resistance. In this study, silver-loaded molybdenum disulfide (MoS 2 ) composites were synthesized via polydopamine (PDA) modification and employed as the reinforcing phase to fabricate Ag/PDA/MoS 2 -PTFE composites. This study focused on the tribological and mechanical properties of these composites. The results indicated that the incorporation of Ag/PDA/MoS 2 effectively enhanced the tribological performance, thermomechanical properties, and tensile strength of PTFE. Specifically, at a filler content of 1 wt%, the composite exhibited the optimal lubricating performance, with a 42.5% increase in tensile strength. Furthermore, the composites maintained excellent tribological and thermomechanical properties even at elevated temperatures ranging from room temperature (25°C to 250°C). The mechanism for the property enhancement is attributed to the adsorption interactions of Ag/PDA/MoS 2 , which restrict the movement of the PTFE molecular chains, thereby reinforcing the mechanical strength and wear resistance of the polymer matrix. During friction, Ag/PDA/MoS 2 underwent adsorption, diffusion, and interlayer sliding. Owing to the adhesive nature of PDA, a protective tribofilm composed of Ag, PDA, and PTFE was formed on the friction surface to achieve a multicomponent synergistic lubrication effect. Thus, these composites exhibit significant potential for oil-free, self-lubricating, high-end engineering applications. Highlights Dopamine polymerization yields a spherical-layer composite structure. Hybrid fillers restrict polymer chain motion to increase tensile strength. Composite components synergistically form a robust lubricating film. The composite delivers excellent wear resistance at various temperatures. Filler addition increases the matrix elastic modulus across broad temperatures.
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