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Temperature effect on mechanical strength and frictional properties of polytetrafluoroethylene‐based core‐shell nanocomposites
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2020-09-17 , DOI: 10.1002/app.49929 Zhengliang Bian 1 , Lin Zhang 1 , Shuai Wu 1 , Feng He 1 , Fan Zhang 2 , Jinshan Pan 2 , Guoxin Xie 1
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2020-09-17 , DOI: 10.1002/app.49929 Zhengliang Bian 1 , Lin Zhang 1 , Shuai Wu 1 , Feng He 1 , Fan Zhang 2 , Jinshan Pan 2 , Guoxin Xie 1
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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 0.3 × 10−5 mm3/(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.
中文翻译：
温度对基于聚四氟乙烯的核壳纳米复合材料的机械强度和摩擦性能的影响
聚四氟乙烯（PTFE）作为固体润滑剂具有出色的润滑性，但由于其低机械强度和高磨损率，其应用受到限制。在这项研究中，以聚四氟乙烯为核，聚甲基丙烯酸甲酯（PMMA）为壳，合成了核壳纳米粒子。与具有相同组成的机械混合复合材料相比，通过利用核壳纳米颗粒作为基本结构单元而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着增强。我们的实验证明了以下结果：（1）由于具有出色的均匀性，核-壳纳米复合材料的最大拉伸强度为62 MPa，是机械混合复合材料的三倍。× 10 -5 mm 3 /（N m），比机械混合的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，以了解润滑机理。事实证明，温度可以降低模量，增加界面粘合性以及核壳纳米复合材料的损耗角正切，从而以多种方式影响润滑性能。
更新日期：2020-11-25
中文翻译：
温度对基于聚四氟乙烯的核壳纳米复合材料的机械强度和摩擦性能的影响
聚四氟乙烯（PTFE）作为固体润滑剂具有出色的润滑性，但由于其低机械强度和高磨损率，其应用受到限制。在这项研究中，以聚四氟乙烯为核，聚甲基丙烯酸甲酯（PMMA）为壳，合成了核壳纳米粒子。与具有相同组成的机械混合复合材料相比，通过利用核壳纳米颗粒作为基本结构单元而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着增强。我们的实验证明了以下结果：（1）由于具有出色的均匀性，核-壳纳米复合材料的最大拉伸强度为62 MPa，是机械混合复合材料的三倍。× 10 -5 mm 3 /（N m），比机械混合的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，以了解润滑机理。事实证明，温度可以降低模量，增加界面粘合性以及核壳纳米复合材料的损耗角正切，从而以多种方式影响润滑性能。
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