A facile electrostatic self-assembly way was developed to prepare Cu nanoparticles @ rGO (reduced graphene oxide) nanosheets to enhance the properties of PI (polyimide) composites. Through the electrostatic self-assembly between Cu and rGO, interface compatibility of Cu and PI matrix was improved. Meanwhile, the zero-dimensional Cu and two-dimensional rGO in core-shell Cu@rGO hybrids could integrate the multiple advantages and provide synergistic enhancement for PI composites. As a result, the maximum thermal decomposition temperature of PI/Cu@rGO composites recorded an increase of 12 °C in comparision with that of pure PI. In addition, the Cu@rGO hybrids demonstrated the optimal lubrication properties for PI matrix compared to individual Cu, rGO and Cu/rGO blend. For PI/Cu@rGO-0.5 wt% composites, the specific wear rate and average friction coefficient were decreased by 44.1% and 11.6%. The outstanding tribological performance of PI/Cu@rGO composites can be ascribed to the synergistic enhancement between Cu nanoparticles and rGO nanosheets as well as the formation of high-quality transfer film. Furthermore, the inherent abrasion mechanism of PI/Cu@rGO composites was explored systematically.

开发了一种简便的静电自组装方法来制备rGO（还原氧化石墨烯）纳米片材的Cu纳米粒子，以增强PI（聚酰亚胺）复合材料的性能。通过Cu与rGO之间的静电自组装，提高了Cu与PI基体的界面相容性。同时，核-壳Cu @ rGO杂化体中的零维Cu和二维rGO可以整合多种优势，并为PI复合材料提供协同增效作用。结果，与纯PI相比，PI / Cu @ rGO复合材料的最高热分解温度增加了12°C。此外，与单独的Cu，rGO和Cu / rGO混合物相比，Cu @ rGO杂化物表现出PI基体的最佳润滑性能。对于PI/Cu@rGO-0.5 wt％复合材料，比磨损率和平均摩擦系数分别降低了44.1％和11.6％。PI / Cu @ rGO复合材料的优异摩擦学性能归因于Cu纳米颗粒和rGO纳米片之间的协同增强作用以及高质量转移膜的形成。此外，系统地研究了PI / Cu @ rGO复合材料的固有磨损机理。