Nanomaterials as lubricating oil additives have attracted significant attention because of their designable composition and structure, suitable mechanical property, and tunable surface functionalities. However, the poor compatibility between nanomaterials and base oil limits their further applications. In this work, we demonstrated oil-soluble poly (lauryl methacrylate) (PLMA) brushes-grafted metal-organic frameworks nanoparticles (nanoMOFs) as lubricating oil additives that can achieve efficient friction reduction and anti-wear performance. Macroinitiators were synthesized by free-radical polymerization, which was coordinatively grafted onto the surface of the UiO-67 nanoparticles. Then, PLMA brushes were grown on the macroinitiator-modified UiO-67 by surface-initiated atom transfer radical polymerization, which greatly improved the lipophilic property of the UiO-67 nanoparticles and significantly enhanced the colloidal stability and long-term dispersity in both non-polar solvent and base oil. By adding UiO-67@PLMA nanoparticles into the 500 SN base oil, coefficient of friction and wear volume reductions of 45.3% and 75.5% were achieved due to their excellent mechanical properties and oil dispersibility. Moreover, the load-carrying capacity of 500 SN was greatly increased from 100 to 500 N by the UiO-67@PLMA additives, and their excellent tribological performance was demonstrated even at a high friction frequency of 65 Hz and high temperature of 120 °C. Our work highlights oil-soluble polymer brushes-functionalized nanoMOFs for highly efficient lubricating additives.

纳米材料作为润滑油添加剂因其可设计的组成和结构、合适的机械性能和可调节的表面功能而引起了人们的广泛关注。然而，纳米材料与基础油的相容性较差，限制了其进一步应用。在这项工作中，我们展示了油溶性聚（甲基丙烯酸月桂酯）（PLMA）刷接枝金属有机框架纳米颗粒（nanoMOF）作为润滑油添加剂，可以实现高效的减摩和抗磨性能。通过自由基聚合合成大分子引发剂，将其配位接枝到 UiO-67 纳米粒子的表面。然后，通过表面引发原子转移自由基聚合在大引发剂修饰的UiO-67上生长PLMA刷，大大改善了UiO-67纳米颗粒的亲油性能，并显着增强了胶体稳定性和在非亲水介质中的长期分散性。极性溶剂和基础油。通过在500 SN基础油中添加UiO-67@PLMA纳米颗粒，由于其优异的机械性能和油分散性，摩擦系数和磨损体积分别降低了45.3%和75.5%。此外，UiO-67@PLMA添加剂将500 SN的承载能力从100 N大幅提高到500 N，即使在65 Hz的高摩擦频率和120 °C的高温下也表现出优异的摩擦学性能。我们的工作重点是用于高效润滑添加剂的油溶性聚合物刷功能化纳米MOF。