Aims: Microcapsules comprising of a poly(methyl methacrylate) (PMMA) shell and friction modifier (FM) core were prepared to reduce the friction and extend the service life of engine lubricating oil.Methods: Microcapsules containing both organic FM and molybdenum FM were produced via solvent evaporation technique. The friction coefficient, thermal stability, and chemical composition of microcapsules were investigated.Results: The incorporation of microcapsules in lubricating oil dramatically reduced the friction coefficient to be lower than that of virgin FM. Organic FM and molybdenum FM are compatible during the encapsulation process. The release of the FM inside the microcapsules was controllable by thermal degradation of polymeric shell at 150 °C or mechanical rupture at room temperature.Conclusions: This study provided a novel approach to improve the tribological properties of lubricating oil with long service life, facile fabrication and low cost and will find potential applications in lubrication industry for internal combustion engines.

中文翻译：

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含摩擦改性剂的聚（甲基丙烯酸甲酯）（PMMA）微胶囊的制备及其摩擦学性能。

目的：制备由聚甲基丙烯酸甲酯（PMMA）壳和摩擦改进剂（FM）核组成的微胶囊，以减少摩擦并延长发动机润滑油的使用寿命。方法：制备同时含有有机FM和钼FM的微胶囊。通过溶剂蒸发技术。结果：微胶囊的摩擦系数，热稳定性和化学组成都得到了研究。结果：微胶囊在润滑油中的掺入使摩擦系数大大降低，低于原始FM。在封装过程中，有机FM和钼FM兼容。微囊内部FM的释放可通过聚合物壳在150°C下热降解或在室温下机械破裂来控制。