Effects of several modifiers on oil-bearing and tribological properties of porous polyimides

In order to explore the enhancement and improvement of porous polyimide (PI) material’s oil content and tribological properties, PI materials were prepared by using mesoporous carbon, graphene and rare earth as modifiers, respectively.The effects of different modifiers on the oil content property, tribological property and mechanical property of the materials were studied.The experimental results show that mesoporous carbon can greatly increase the oil content of porous PI.Compared with pure PI, the oil content of 2% mesoporous carbon increased by 55.6%, but the friction coefficient tends to increase, the mechanical property decreased obviously;a small amount of graphene can improve the oil content and frictional properties of porous PI, but with the increase of graphene content, the oil content friction coefficient of porous PI increases rapidly, and the impact strength decreased significantly;rare earth has greatly improved the oil content friction properties of porous PI, as the rare earth content increased from 0% to 5%, the friction coefficient decreased from 0.05 to 0.026, there is an inflection point after 5%, however, the oil friction coefficient of all samples were lower than pure PI, and the oil content rate goes up.The mechanical property of rare earth modified porous PI didn’t decrease significantly compared with mesoporous carbon and graphene, which shows the best enhancement effect on comperhensive performance of porous PI.