Improved mechanical and tribological properties of polytetrafluoroethylene reinforced by carbon nanotubes: A molecular dynamics study

Song, Jingfu; Hao, Lei; Zhao, Gai

doi:10.1016/j.commatsci.2019.05.058

Cited by 60 publications

(24 citation statements)

References 26 publications

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“…However, subject to the restrictions on the poor wear resistance and mechanical strength of PTFE, there are still many difficulties existing in the application of practical engineering for PTFE composites. [6][7][8] Various types of reinforcement materials including MnO 2 , 9 MoS 2 , 10 aramid fiber, 11 graphene oxide, 12,13 carbon fiber, 14 carbon nanotubes, 15 black phosphorus nanoparticles 16 and so on are added into the PTFE matrix to enhance the anti-friction and wear resistance performances of this polymer. Apart from the aforementioned reinforcement fillers, a number of polymeric materials like polyimide, 17 polyphenylene sulfide, 18 polyethersulfone (PES) 19 and polyacrylate 20 are blended into the PTFE via physical or chemical methods to produce many novel polymer alloys with outstanding tribological properties.…”

Section: Introductionmentioning

confidence: 99%

Retracted: Influence of organic montmorillonite nanoparticles on the microstructures and thermal and tribological properties of polyethersulfone and polytetrafluoroethylene composites

Yan

Xue

Wang³

et al. 2020

Polymer International

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Because of high wear rate and low thermal deformation temperature, the generalization and application of polytetrafluoroethylene (PTFE) in the field of tribology is restrained to a certain extent. In order to improve the wear resistance and thermal stability of this self‐lubricating polymer, organic montmorillonite (OMMT) nanoparticle reinforced polyethersulfone (PES) and PTFE ternary composites were prepared by the cold molding and vacuum sintering technology. The effects of sodium montmorillonite (Na‐MMT) and OMMT on the microstructures, thermal stabilities and tribological properties of PTFE composites were comparatively studied. The results show that the thermal stability of the PES/PTFE composites is clearly improved by the incorporation of OMMT nanoparticles. Not only the friction coefficients but also the wear rates of OMMT/PES/PTFE composites are less than those of Na‐MMT/PES/PTFE composites under identical tribological tests. Of all these PTFE composites, the PES/PTFE composite containing 10.0 wt% OMMT nanoparticles exhibits the best friction and wear properties (μ = 0.14, k = 5.78 × 10−15 m3 N–1 m−1). This can be attributed to the existence of a polymer multicomponent layer consisting of PTFE, PES and OMMT on the composite surface as well as the formation of uniform PTFE transfer film on the worn surfaces of metal counterparts.

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Section: Introductionmentioning

confidence: 99%

Retracted: Influence of organic montmorillonite nanoparticles on the microstructures and thermal and tribological properties of polyethersulfone and polytetrafluoroethylene composites

Yan

Xue

Wang³

et al. 2020

Polymer International

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“…It can be seen that the curves of polyimide composite at 600 K was flatter than that at 213 K. Relative concentration in the sliding direction reflected the roughness of the friction interface to some extent. A higher relative concentration meant there were more atoms accumulated here caused by shear forces 15,41,42 . Therefore, it can be inferred from Figure 15 that the friction interface of the composite was more rugged at 213 K, which resulted in a higher friction coefficient.…”

Section: Resultsmentioning

confidence: 98%

Improving the high temperature tribology of polyimide by molecular structure design and grafting POSS

Yin

Song

Zhao

et al. 2021

Polymers for Advanced Techs

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In this paper, the method of enhancing glass transition temperature of polyimide (PI) composite for ultrasonic motor was employed from the three aspects by molecular dynamics simulation. First, polyimide with different molecular stiffness was designed and their mechanical and thermal properties were calculated after optimization. The simulated results showed that polyimide with stronger stiffness had higher glass transition temperature (Tg), higher Young's modulus and shear modulus. Besides, PI composite was designed by filling different proportional polyhedral oligomeric silsesquioxane (POSS) to improve the thermostability continuously. Simulated results showed that the glass transition temperature of PI composites increased with an increase of POSS content. The third method was filling grafted POSS (POSS‐PI) with PI molecular into PI matrix to improve the compatibility. It was found that the thermal properties were slightly improved compared with PI filled with single POSS. PI composite with 9% POSS‐PI2 had the highest glass transition temperature. More importantly, the friction coefficient and the temperature rise on the friction interface were calculated and the result showed that the friction coefficient decreased with the increase of environment temperature. Finally, the improvement mechanism of grafted POSS was analyzed by extracting the energy of intermolecular interaction, mean square displacement, atomic relative concentration and velocity.

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“…In this work, AR was used to evaluate the tribological properties of materials, which may be defined by the ratio of the numbers of the worn-out atoms ( N worn-out ) to the total atoms ( N Total ) of the polymer materials. Worn-out atoms ( N worn-out ) are defined as the number of the total atoms which adhered onto the surface of iron nanolayer and escaped from the polymer material (either TPU or fGr/TPU) 71,72 …”

Section: Models and Methods Of MD Simulationmentioning

confidence: 99%

A molecular dynamics-based investigation on tribological properties of functionalized graphene reinforced thermoplastic polyurethane nanocomposites

Talapatra

Datta

2020

Proceedings of the Institution of Mechanical Engineers, Part J:

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Tribo-mechanical properties of pure thermoplastic polyurethane and functionalized monolayer graphene-reinforced thermoplastic polyurethane polymer nanocomposites are investigated by molecular dynamics simulations. Initially, the mechanical properties of the thermoplastic polyurethane and functionalized monolayer graphene-reinforced thermoplastic polyurethane nanocomposites are measured by applying constant stain method. Subsequently, interfacial layer models are developed to apply confined shear on the iron layers to find out the coefficient of friction and the abrasion rate of pure thermoplastic polyurethane and functionalized monolayer graphene-reinforced thermoplastic polyurethane nanocomposites. The results imply that by the incorporation of 0.5 wt.% functionalized monolayer, graphene shows the increase of 20% in Young’s modulus, 15% in shear modulus and 6.66% in bulk modulus of pure thermoplastic polyurethane, respectively, which are in good agreement with the previous experimental studies. Maximum enhancement of mechanical properties can be obtained up to 3 wt.% addition of functionalized monolayer graphene addition in thermoplastic polyurethane matrix. Further, it is observed that 3 wt.% of functionalized monolayer graphene-reinforced thermoplastic polyurethane nanocomposite results in minimum coefficient of friction (0.42) and abrasion rate (19%) under constant normal load (5 kcal/mol/Å) and maximum sliding velocity (11 m/s). However, further reduction in minimum values of coefficient of friction and abrasion rate at 3 wt.% of functionalized monolayer graphene-reinforced thermoplastic polyurethane nanocomposites is seen under the minimum sliding velocity (1 m/s) considered with the same normal load condition. Finally, the inherent mechanisms for enhancement of tribo-mechanical properties in functionalized monolayer graphene-reinforced thermoplastic polyurethane nanocomposites are analysed by the atomic density profile, free volume and Connolly surface at the atomic level.

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Improved mechanical and tribological properties of polytetrafluoroethylene reinforced by carbon nanotubes: A molecular dynamics study

Cited by 60 publications

References 26 publications

Retracted: Influence of organic montmorillonite nanoparticles on the microstructures and thermal and tribological properties of polyethersulfone and polytetrafluoroethylene composites

Retracted: Influence of organic montmorillonite nanoparticles on the microstructures and thermal and tribological properties of polyethersulfone and polytetrafluoroethylene composites

Improving the high temperature tribology of polyimide by molecular structure design and grafting POSS

A molecular dynamics-based investigation on tribological properties of functionalized graphene reinforced thermoplastic polyurethane nanocomposites

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