<p>Polyphenylene sulfide(PPS) has excellent high temperature resistance, corrosion resistance, and high strength performance, but its wear resistance is relatively poor. Mo₂CT_x is a self-lubricating and wear-resistant MXene material. In this study, PPS nanocomposites with different mass fractions of surface modified Mo₂CT_x were prepared by micro injection molding, and their thermal stability, tribological properties at high temperature, and enhancement mechanism were investigated. The results showed that compared with pure PPS, the thermal properties of the nanocomposite were significantly improved, and the friction coefficient and wear volume were reduced at both room temperature and high temperature. Thermal analysis shows that the degradation temperature (Td05) and crystallinity of PPS nanocomposites are significantly increased, which is due to the enhanced interfacial bonding strength of the composite by polydopamine. During the friction process, the addition of Mo₂CT_x is beneficial for the formation of lubrication transfer films and the transformation of wear mechanisms (abrasive wear and adhesive wear), which helps to improve tribological behavior. When the MXene content is 1.0%, a wear rate reduction of 94.4% and 92% was achieved at room temperature and 250&#xa0;°C, respectively. This work provides a feasible solution to improve the performance of PPS under extreme conditions.</p>