In order to explore the friction and wear mechanisms of polyimide with metal, this work addressed the tribological properties of the polyimide with different molecular structures in a wide temperature range. It was found that the incorporation of fluorine and sulfur atoms into polyimide had a significant effect on their mechanical and tribological properties. Generally, the wear rates of FPI and SPI are much higher than PI, and FPI displays the worst friction coefficient. To deeper reveal the fundamental reasons, the FTIR, XPS, EDS, SEM characterizations were carried out combined with molecular dynamic simulation. The calculation results from the Molecular Dynamics model between PI and Fe showed that the interaction potential energy of SPI and FPI was larger than that of PI due to the polarization of F and S. Judged from the structures of transfer film, SPI and FPI was easily adhered on the surface of counterpart, even chemical reaction. The XPS analysis further confirmed the possibility of tribo-chemical reactions between SPI/FPI and Fe. This study will provide the theoretical guidance for other polymer molecular design and its tribological research.

为了探索聚酰亚胺与金属的摩擦和磨损机理，这项工作解决了在宽温度范围内具有不同分子结构的聚酰亚胺的摩擦学性能。发现将氟和硫原子掺入聚酰亚胺中对它们的机械和摩擦学性能具有显着影响。通常，FPI和SPI的磨损率比PI高得多，并且FPI的摩擦系数最差。为了更深入地揭示根本原因，结合分子动力学模拟对FTIR，XPS，EDS，SEM进行了表征。PI和Fe之间的分子动力学模型的计算结果表明，由于F和S的极化，SPI和FPI的相互作用势能大于PI。从转移膜的结构来看，SPI和FPI很容易粘附在对应物的表面，甚至发生化学反应。XPS分析进一步证实了SPI / FPI与铁之间可能发生摩擦化学反应。该研究将为其他聚合物分子设计及其摩擦学研究提供理论指导。