Abstract A facile and characteristic one-step emulsifier-free polymerization strategy was proposed to graft a poly (ethylene imine) (PEI) nanolayer onto carbon spheres (CS) surface, forming an amphiphilic particle, and to apply as an efficient lubricating additive to improve the tribological performances of traditional lubricating oils. Hybrid lubricants, containing carbon spheres/poly (ethylene imine) (CS-PEI) particles dispersed in engine oil, were evaluated regarding their tribological performances under ball-on-disk tribometry. The steel substrates lubricated by CS-PEI showed clearly improved, with a significant reduction in the friction and wear (15–42%). These tribological improvements were attributed to several functions of CS-PEI additives, including: Ⅰ) bearing and filling mechanisms, Ⅱ) superior wear and friction resistances, Ⅲ) formation of PEI lubrication films with lower shear-strength on contact interfaces.

中文翻译：

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将 PEI 超抗磨纳米层接枝到碳球上作为润滑剂添加剂以增强摩擦力

摘要 提出了一种简便且具有特点的无乳化剂一步聚合策略，将聚（乙烯亚胺）（PEI）纳米层接枝到碳球（CS）表面，形成两亲性颗粒，并作为一种有效的润滑添加剂应用以改善传统润滑油的摩擦学性能。包含分散在发动机油中的碳球/聚（乙烯亚胺）（CS-PEI）颗粒的混合润滑剂在球盘摩擦法下评估了它们的摩擦学性能。CS-PEI 润滑的钢基材显示出明显改善，摩擦和磨损显着降低（15-42%）。这些摩擦学改进归因于 CS-PEI 添加剂的多种功能，包括：Ⅰ）轴承和填充机制，Ⅱ）优异的耐磨性和摩擦阻力，