Herein, the functionalized graphite carbon nitride (DDP@g-CN) nanosheets were successfully prepared via the surface self-assembly method combined with “click” reaction. Firstly, the 3-(trimethoxysilyl) propyl acrylate (TOPA) was self-assembled onto the g-CN surface to obtain TOPA@g-CN, then the dialkyl dithiophosphate (DDP) was grafted onto TOPA@g-CN via thiol-ene “click” reaction formation of DDP@g-CN. The load-carrying capacity of PAO10 is increased to 900 N from 200 N with 1.5 wt% DDP@g-CN addition, and the average COF decreased from 0.17 to 0.10, accompanied by a 96.7 % decrease in wear volume. This improved lubricating performance is attributed to the formation of a continuous protective film including iron oxides, iron sulfide, and iron phosphate via tribochemical reactions, which prevent direct contact and seizure between friction pairs.

中文翻译：

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通过硫醇-烯“点击”反应制备 DDP 功能化氮化碳纳米片作为润滑油添加剂


在此，通过表面自组装方法结合“点击”反应成功制备了功能化石墨氮化碳（DDP@g-CN）纳米片。首先将丙烯酸3-(三甲氧基甲硅烷基)丙酯(TOPA)自组装到g-CN表面得到TOPA@g-CN,然后通过硫醇烯将二烷基二硫代磷酸酯(DDP)接枝到TOPA@g-CN上“点击”反应形成DDP@g-CN。添加 1.5 wt% DDP@g-CN 后，PAO10 的承载能力从 200 N 提高到 900 N，平均 COF 从 0.17 降低到 0.10，磨损量降低 96.7%。这种润滑性能的改善归因于通过摩擦化学反应形成了包括氧化铁、硫化铁和磷酸铁的连续保护膜，从而防止摩擦副之间的直接接触和卡住。