Abstract
Tribological behaviors of porous polyimide (PPI) impregnated with polyalphaolefin at different temperatures were investigated. As temperature increases, the coefficient of friction (COF) of PPI decreases at 0.15 m/s but no obviously changes at 0.01 m/s. In contrast, the COF of non-porous polyimide under external oil-supply increases regardless of speeds. This is due to the fact that COF is related to the oil-supply and viscosity determined by temperature. At 0.15 m/s, PPI is in mixed lubrication, self-healing of desorbed adsorption-film and reducing interlaminar shear-force lead to lower COF. However, at 0.01 m/s, PPI is in boundary lubrication, the stored oil can be slowly released and migrated to the interface to heal the adsorption-film, and prevent COF from further increasing.
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