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The mechanical and tribological properties of micrometer-and nanometer-TiO2 filled polytetrafluoroethylene (PTFE)/polyimide (PI) composites were studied in this paper.The effect of filler contents (0.5%, 1%, 1.5%, 2%, 3%, 5% and 7 vol.%) on the tribological properties was examined.The transfer films and the worn surfaces of the PTFE/PI composites filled with micrometer and nanometer TiO2 particles were investigated by using a scanning electron microscope (SEM).