Temperature effect on mechanical strength and frictional properties of polytetrafluoroethylene‐based core‐shell nanocomposites

Abstract

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 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.

Significant enhancement on the mechanical and tribological performances of paper‐based friction materials by designing silicone@SiO2 core‐shell structure

“…On the one hand, the existence of hydrophilic SiO 2 would benefit to improve the surface wettability of silicone particles, facilitating the formation of strong physical bonds between fibers and the matrix 10 . On another hand, this unique core‐shell enhancement would act as an active bridge to promote the integration of modified fibers and the matrix, thereby significantly promoting the related properties of the composites 19 . The schematic illustration of silicone@SiO 2 ‐modified polyimide matrix was displayed in Figure 3g.…”

“…10 On another hand, this F I G U R E 3 SEM images of (a) silicone and (b), (c) silicone@SiO 2 ; TEM images and element mapping of (d1-d3) silicone, (e1-e3) silicone@SiO 2 and (f1-f3) SiO 2 ; (g) schematic illustration of silicone@SiO 2 -modified resin matrix; (h) FTIR spectra of silicone and silicone@SiO 2 [Color figure can be viewed at wileyonlinelibrary.com] unique core-shell enhancement would act as an active bridge to promote the integration of modified fibers and the matrix, thereby significantly promoting the related properties of the composites. 19 The schematic illustration of silicone@SiO 2 -modified polyimide matrix was displayed in Figure 3g. The presence of silicone@SiO 2 onto the resin matrix could not only increase the surface roughness of the composites, but also provide the interface-enhanced phase with numerous reaction active sites, further achieving the goal of interfacial enhancement of composite materials.…”

Experimentation and optimization of wear behavior on polytetrafluoroethylene composites using response surface methodology and bald eagle search optimization

“…Bian et al [20] Core-shell 0.3 Â 10 À5 0.08 Suresh et al [27] 4% Halloysite 7.83 Â 10 À5 0.0105 Sahin [31] 15% Glass 0.722 Â 10 À5 -60% Bronze 2.75 Â 10 À5 -25% Carbon 3.375 Â 10 À5 -Manafi and Kiahosseini [34] 5% Nano clay 0.32 Â 10 À5 0.25…”

“…The simulation prediction using ANSYS also showed promisingly accurate results. Bian et al [ 20 ] experimentally analyzed the variation in mechanical and frictional property for temperature in PTFE‐based core‐shell nanocomposites. The results show better tensile strength with wear‐resistant properties.…”

Effect of nano-serpentine and nano-La2O3 on the frictional properties of PTFE composites in seawater environment

“…Polytetrafluoroethylene (PTFE) composites are potential engineering polymer matrix composites for self-lubricating bearings and seals in various mechanical systems (Song and Zhao, 2019; Manafi and Kiahosseini, 2019; Lin et al , 2021; Bian et al , 2021). Due to their low coefficient of friction (COF), excellent chemical stability, low water absorption and good corrosion resistance, PTFE composites are suitable for use in aqueous environments where moving parts are in contact with water (Haidar et al , 2018; Campbell et al , 2019).…”