Tribological Behavior of Poly(tetrafluoroethylene) and Its Composites Reinforced by Carbon Nanotubes and Graphene Sheets: Molecular Dynamics Simulation,Physica Status Solidi-Rapid Research Letters

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Tribological Behavior of Poly(tetrafluoroethylene) and Its Composites Reinforced by Carbon Nanotubes and Graphene Sheets: Molecular Dynamics Simulation
Physica Status Solidi-Rapid Research Letters ( IF 2.5 ) Pub Date : 2021-06-26 , DOI: 10.1002/pssr.202100298
Qiang Xu ₁ , Jie Zhang ₁ , Yuan-Zhong Hu ₁ , Tian-Bao Ma ₁

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Low-dimensional fillers play an important role in improving the tribological properties of poly(tetrafluoroethylene) (PTFE) composites. However, the reinforcement mechanism is not fully understood, since few in situ experiments are able to capture the dynamics evolution and interfacial behavior of fillers. Herein, the tribological behavior of PTFE composites filled with graphene (Gr) sheets and carbon nanotubes (CNT) at the nanoscale is investigated. The results demonstrate that the composites filled with the CNT and Gr fillers have much better wear resistance than that of the pure PTFE, and the wear amounts are reduced by 76.2% and 85.7%, respectively. The relative bond and angle energy of PTFE indicate less deformation in the reinforced composite matrices. The calculations of interfacial interaction energy and radial distribution function reveal that the Gr fillers have better reinforcements than CNT due to stronger interactions at the Gr/PTFE interfaces.

中文翻译：

碳纳米管和石墨烯片增强的聚四氟乙烯及其复合材料的摩擦学行为：分子动力学模拟

低维填料在改善聚（四氟乙烯）（PTFE）复合材料的摩擦学性能方面发挥着重要作用。然而，增强机制尚不完全清楚，因为很少有原位实验能够捕捉到填料的动力学演变和界面行为。在此，研究了填充石墨烯 (Gr) 片和碳纳米管 (CNT) 的 PTFE 复合材料在纳米尺度上的摩擦学行为。结果表明，填充CNT和Gr的复合材料的耐磨性明显优于纯PTFE，磨损量分别降低了76.2%和85.7%。PTFE 的相对键和角能表明增强复合材料基体的变形较小。

更新日期：2021-06-26

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