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首页> 外文期刊>Journal of Applied Polymer Science >Temperature effect on mechanical strength and frictional properties of polytetrafluoroethylene-based core-shell nanocomposites
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Temperature effect on mechanical strength and frictional properties of polytetrafluoroethylene-based core-shell nanocomposites

机译：基于聚四氟乙烯核心壳纳米复合材料的机械强度和摩擦性能的温度效应

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摘要

Polytetrafluoroethylene (PTFE) has shown an outstanding lubricity as a solid lubricant, but its application is limited due to its low-mechanical strength and high-wear rate. In this study, core-shell nanoparticles were synthesized using PTFE as the core and polymethylmethacrylate (PMMA) as the shell. The formed core-shell nanocomposites by leveraging the core-shell nanoparticles as basic structural units exhibit remarkable enhancement on uniformity, tensile strength, and wear resistance, compared to mechanically mixed composites with the same composition. Our experiments demonstrated the following results: (1) Owing to the excellent uniformity, the maximum tensile strength of core-shell nanocomposites was 62 MPa, three times higher than that of mechanically mixed composites. (2) The composite matrix formed by PMMA shell had better reinforcement and protection effect on inner PTFE phase, resulting in a reduced wear rate of 0.3x10(-5)mm(3)/(N m), one order of magnitude lower than that of mechanically mixed composites. (3) The friction coefficient and interfacial mechanical properties of the core-shell nanocomposites at different temperatures have been systematically studied to get insights into lubrication mechanisms. It is proved that the temperature can decrease the modulus and increase the interfacial adhesion as well as the loss tangent of the core-shell nanocomposites, thus affecting the lubrication properties in multiple ways.
机译：聚四氟乙烯（PTFE）作为固体润滑剂表现出优异的润滑性，但由于其机械强度低、磨损率高，其应用受到限制。本研究以聚四氟乙烯（PTFE）为核，聚甲基丙烯酸甲酯（PMMA）为壳，合成了核壳型纳米颗粒。与相同成分的机械混合复合材料相比，利用核壳纳米颗粒作为基本结构单元形成的核壳纳米复合材料在均匀性、拉伸强度和耐磨性方面表现出显著增强。实验结果表明：（1）由于核壳纳米复合材料具有良好的均匀性，其最大拉伸强度为62mpa，是机械混合复合材料的三倍。（2） 由PMMA外壳形成的复合材料基体对内部PTFE相具有更好的增强和保护作用，导致磨损率降低0.3x10（-5）mm（3）/（nm），比机械混合复合材料低一个数量级。（3） 系统研究了核壳纳米复合材料在不同温度下的摩擦系数和界面力学性能，以深入了解其润滑机理。结果表明，温度可以降低核壳纳米复合材料的模量，增加界面附着力和损耗角正切，从而从多方面影响其润滑性能。

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