ABSTRACT This study prepares high‐temperature‐resistant polyimide/molybdenum disulfide (PI/MoS 2 ) composites via molecular structure design and composite modification, addressing bearing cage needs under extreme conditions. Rigid p ‐phenylenediamine ( p ‐PDA) is introduced into the PI backbone, raising its glass transition temperature ( T g ) to 430°C–450°C and enhancing thermal stability and mechanical strength. MoS 2 is uniformly dispersed in the PI matrix through in situ polymerization to improve interface compatibility. Friction and wear tests show that 5 wt% MoS 2 content delivers optimal lubrication at room temperature to 300°C, as its layered structure enables interlayer sliding and forms a stable transfer film for solid lubrication. The synergistic effect of rigid units and nanofillers optimizes PI's thermal stability and tribological properties, revealing related mechanisms and expanding PI's engineering applications.
Li et al. (Fri,) studied this question.