Hexagonal boron nitride nanosheets (h-BNNSs), with a crystal lattice structure similar to graphene by over 98%, exhibit good lubrication properties as lubricant additives. However, the poor dispersibility in solvents has limited their wide practical applications as lubricant additives. In the present report, water dispersible Pebax functionalized h-BNNSs (Pebax-BNNSs) have been prepared through a one-step solvent-free mechanical exfoliation process which relies on a simple exfoliation of h-BN layers by shearing force in molten Pebax at 200 °C. In this process, Pebax molecules can synchronously react with the dangling bonds formed during the exfoliation process to achieve in situ functionalization of h-BNNSs. The reciprocating friction tests demonstrate that the as-obtained Pebax-BNNSs possess excellent antifriction and antiwear performance as water-based lubricant additive with a low concentration of 0.3 mg/mL under atmospheric condition. The friction coefficients can be <0.01, achieving superlubrication. Further systematical investigations on the wear traces, wear debris, and counter balls propose a “dispersion-compensation-filling repairment” friction mechanism. All these results demonstrate that h-BNNSs can achieve superlubrication as water-based lubricant additives via facile surface modification, making them very promising candidates as lubricant additives in practical applications.

具有类似于石墨烯的晶格结构超过98％的六方氮化硼纳米片（h -BNNSs）具有良好的润滑性能，可作为润滑剂添加剂。但是，在溶剂中分散性差，限制了它们作为润滑剂添加剂的广泛实际应用。在本报告中，通过一步法无溶剂机械剥离工艺制备了水分散性Pebax官能化h -BNNS（Pebax-BNNSs），该工艺依赖于200°C下熔融Pebax中的剪切力对h -BN层进行简单剥离。℃。在此过程中，Pebax分子可以与剥离过程中形成的悬空键同步反应，从而实现h的原位功能化。-BNNS。往复摩擦试验表明，所制得的Pebax-BNNS作为水基润滑剂添加剂具有优异的减摩和抗磨性能，在大气条件下的浓度低至0.3 mg / mL。摩擦系数可以<0.01，实现超润滑。对磨损痕迹，磨损碎屑和平衡球的进一步系统研究提出了一种“弥散补偿填充修复”摩擦机制。所有这些结果表明，h -BNNSs可以通过容易的表面改性获得作为水基润滑剂添加剂的超润滑性，使其在实际应用中成为非常有希望的候选润滑剂。