Tribological behaviors of amino functionalized graphene reinforced PTFE composite

Wang, Xiao; Wu, Junwei; Zhou, Luhai; Wei, Xicheng; Wang, Wurong

doi:10.1177/1350650117754000

Cited by 11 publications

(6 citation statements)

References 29 publications

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“…PTFE concentration had only a minor effect on the normalized number of drips, which for 0.5 and 1 wt % of PTFE additives were 413 and 374 drips/mm, respectively. The reduction in drips has been attributed to the formation of PTFE fibrils in the blends that increase the extensional viscosity, causing a delay in the first drip time and a concomitant reduction in the number of drips . Our observation is in line with the findings of Kempel et al who reported the efficacy of PTFE in preventing dripping by increasing the viscosity for polycarbonate/acrylonitrile butadiene styrene blends.…”

Section: Resultssupporting

confidence: 91%

“…The reduction in drips has been attributed to the formation of PTFE fibrils in the blends that increase the extensional viscosity, causing a delay in the first drip time and a concomitant reduction in the number of drips. 39 Our observation is in line with the findings of Kempel et al 40 who reported the efficacy of PTFE in preventing dripping by increasing the viscosity for polycarbonate/acrylonitrile butadiene styrene blends. Although PTFE can reduce dripping in polymeric materials, our results show that, despite containing a halogen, PTFE additives do not provide a significant benefit to burning rates.…”

Section: Resultssupporting

confidence: 91%

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Effects of a Layered Morphology on Drip Suppression in Burning Polymers

Behzadfar

Kim

Lee

et al. 2021

ACS Appl. Polym. Mater.

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Fire safety in polymers is critically important with products such as textiles and consumer goods, as well as materials used in construction, aerospace, transportation, and furniture. Additives used as anti-dripping and flame-retardant agents impose acute human health issues and have negative environmental impacts. With a focus on developing additive-free solutions, we used multilayer coextrusion to fabricate layered polyethylene/polypropylene (PE/PP) films and investigated the effect of a layered morphology on dripping and burning rates. The experimental results for multilayered PE/PP samples were compared to control groups of melt blended PE/PP samples. The multilayer configuration provides two significant advantages: 154% delay in the time to the first drip and up to 87% reduction in the number of drips compared to the value for the melt blended samples with no additives. PE/PP blends with up to 2 wt % polytetrafluoroethylene, a commonly used anti-dripping agent in the industry, showed only 85% delay in the time to the first drip and about 60% reduction in the number of drips. We discovered a linear relationship between film thickness and burning rate, which allows for the use of the volumetric burning rate to normalize the effect of film thickness. No benefit in the burning rate was observed when comparing multilayered structures and conventional melt blended architectures or blends with PTFE. Annealing studies and transmission electron microscopy at areas close to the combustion zones confirmed that higher extensional viscosities induced by the layered structures and morphological changes due to the layer breakup play an important role in reducing dripping. By combining the first drip time and overall drip numbers, a parameter, “dripping index”, was defined to establish a fire safety map to simplify material comparisons. This study demonstrates that a multilayer film geometry can provide an additive-free solution to yield control over fire safety parameters in polymers.

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Section: Resultssupporting

confidence: 91%

Section: Resultssupporting

confidence: 91%

Effects of a Layered Morphology on Drip Suppression in Burning Polymers

Behzadfar

Kim

Lee

et al. 2021

ACS Appl. Polym. Mater.

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“…Polytetrafluoroethylene (PTFE) has high chemical stability, excellent temperature resistance, outstanding non-stick properties, good lubricity, strong insulating properties, aging resistance, and very low water absorption. 1,2 Therefore, it has been a widely used type of sealing material in the sealing field, but its low hardness, wear resistance and creep resistance have severely limited its further development. 3 However, fillers could be used in the PTFE matrix to improve the composites’ friction and wear properties, thus increasing the PTFE composites’ applications.…”

Section: Introductionmentioning

confidence: 99%

RETRACTED: Effect of surface treatment of carbon fibers on the mechanical and frictional properties of polyetheretherketone/polytetrafluoroethylene composites: Experimentation and finite element analysis

Xiao

2021

Proceedings of the Institution of Mechanical Engineers, Part J:

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Polytetrafluoroethylene has many excellent properties and a wide range of applications, but its poor wear resistance, hardness, and creep resistance have severely limited the use of the polytetrafluoroethylene composites. In this work, the surface of carbon fibers was treated with silane coupling agent acetone solution, and then sintering technology was used to prepare carbon fibers/polyetheretherketone (PEEK)/ polytetrafluoroethylene composites. The mechanical and frictional wear properties of the composites were analyzed using an electronic tensile tester, a Shore hardness tester, and a frictional wear tester, and scanning electron microscopy was applied to analyze the surface morphology of the composites after wear. The experimental results shown that the addition of carbon fibers could significantly improve the mechanical properties of the composites, reduce the radial shrinkage, and increase the Shore hardness of the composites. Under the same experimental conditions, the carbon fibers (20 wt.%) /polyetheretherketone/polytetrafluoroethylene composites has the best wear resistance, with a friction coefficient of 0.196 and the wear rate of 2.41 × 10−6 mm3/N·m. In the theoretical simulation, the thermal conductivity of polytetrafluoroethylene composites was predicted using ANSYS software, with the changes in the temperature and friction force in the friction process. The theoretical simulation results matched with the experimental values, which proved the accuracy of the theoretical simulations.

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“…PTFE is a self-lubricating material 25,26 with extremely low COF, [27][28][29][30] widely used in aerospace, machinery, chemical equipment, electronics, biomedicine, and other fields. When the PTFE and the metal surface rub against each other, the PTFE molecular chain breaks, 31 generating various free radical fragments.…”

Section: Introductionmentioning

confidence: 99%

Tribological properties of dopamine-modified dimple textured surfaces filled with PTFE

Zhao

Zou

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part J:

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PTFE-filled textured surfaces were impregnated with the dopamine dipping solution to improve their tribological performances. Ball-on-disc wear experiments were conducted to compare tribological properties of three surfaces: the textured surface, filled textured surface and modified filled textured surface. The worn surfaces, wear debris, and shedding areas of the PTFE were measured, and shear strength between the PTFE block and medium carbon steel after impregnation modification was analysed. Experimental results showed that compared with textured surfaces, filled textured surfaces and modified filled textured surfaces had lower friction coefficient values and cross-sectional areas of wear scars. Compared with the filled textured surface, the modified filled textured surface reduces filled gaps by 63.5% and the shedding ratio of the PTFE within dimples by 63.2%. The research results demonstrate that tribological performances of the filled textured surface can improve after impregnation modification. Polydopamine can react to covalent-noncovalent interaction with PTFE and medium carbon steel. Polydopamine acts as a binder to improve the bonding strength between the PTFE and the inner wall of dimples. Polydopamine can reduce the shedding ratio of the PTFE and maintain the antifriction function of the PTFE in dimples.

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Tribological behaviors of amino functionalized graphene reinforced PTFE composite

Cited by 11 publications

References 29 publications

Effects of a Layered Morphology on Drip Suppression in Burning Polymers

Effects of a Layered Morphology on Drip Suppression in Burning Polymers

RETRACTED: Effect of surface treatment of carbon fibers on the mechanical and frictional properties of polyetheretherketone/polytetrafluoroethylene composites: Experimentation and finite element analysis

Tribological properties of dopamine-modified dimple textured surfaces filled with PTFE

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