Nanotribological characterization of industrial polytetrafluorethylene-based coatings by atomic force microscopy

Podestà, Alessandro; Fantoni, G.; Milani, Paolo; Guida, Carolina; Volponi, S.

doi:10.1016/s0040-6090(02)00778-2

Cited by 11 publications

(10 citation statements)

References 26 publications

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“…Many polymers, especially synthetic polymers such as polytetrafluroethylene (PTFE, also known as Teflon), are hydrophobic. The hydrophobicity has been used to explain why no change was observed in friction against polyimide at higher humidities [200] or with PTFE at lower humidities [201]. However, tests over a wider range of RH have found noticeable friction and wear differences for synthetic polymers.…”

Section: Environmental Effect On Friction and Wear Of Polymeric Matermentioning

confidence: 99%

Vapors in the ambient—A complication in tribological studies or an engineering solution of tribological problems?

et al. 2015

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Tribology involves not only two-body contacts of two solid materials-a substrate and a counter-surface; it often involves three-body contacts whether the third body is intentionally introduced or inevitably added during the sliding or rubbing. The intentionally added third body could be lubricant oil or engineered nanomaterial used to mitigate the friction and wear of the sliding contact. The inevitably added third body could be wear debris created from the substrate or the counter surface during sliding. Even in the absence of any solid third-body between the sliding surfaces, molecular adsorption of water or organic vapors from the surrounding environment can dramatically alter the friction and wear behavior of solid surfaces tested in the absence of lubricant oils. This review article covers the last case: the effects of molecular adsorption on sliding solid surfaces both inevitably occurring due to the ambient test and intentionally introduced as a solution for engineering problems. We will review how adsorbed molecules can change the course of wear and friction, as well as the mechanical and chemical behavior, of a wide range of materials under sliding conditions.

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Section: Environmental Effect On Friction and Wear Of Polymeric Matermentioning

confidence: 99%

Vapors in the ambient—A complication in tribological studies or an engineering solution of tribological problems?

et al. 2015

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“…There are studies in the literature reporting that a higher humidity in the testing environment increases the measured friction coefficient of pure PTFE. 61 The results of this PTFE study may explain why the coefficient of friction measured in ambient air in this work is higher than the value measured in high pressure argon. More work needs to be done to identify the role that humidity plays in the tribological properties of NBR in high pressure hydrogen.…”

Section: A Load Cell Measurementsmentioning

confidence: 54%

An in situ tribometer for measuring friction and wear of polymers in a high pressure hydrogen environment

Duranty

Roosendaal

Pitman

et al. 2017

Review of Scientific Instruments

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High pressure hydrogen effects on the friction and wear of polymers are of importance to myriad applications. Of special concern are those used in the infrastructure for hydrogen vehicle refueling stations, including compressor sliding seals, valves, and actuators. While much is known about potentially damaging embrittlement effects of hydrogen on metals, relatively little is known about the effects of high pressure hydrogen on polymers. However, based on the limited results that are published in the literature, polymers also apparently exhibit compatibility issues with hydrogen. An additional study is needed to elucidate these effects to avoid incompatibilities either through design or material selection. As part of this effort, we present here in situ high pressure hydrogen studies of the friction and wear on example polymers. To this end, we have built and demonstrated a custom-built pin-on-flat linear reciprocating tribometer and demonstrated its use with in situ studies of friction and wear behavior of nitrile butadiene rubber polymer samples in 28 MPa hydrogen. Tribology results indicate that friction and wear is increased in high pressure hydrogen as compared both with values measured in high pressure argon and ambient air conditions.

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“…Relative coefficient of friction is obtained from slope of the lines, with SRP films providing relative friction coefficient approximately half that of PS films (Table 3). In fact, the low COF of 0.037 measured for SRP approaches that of Teflon nanotribology evaluations, with reported COF of approximately 0.03 [35]. These very low nanoscale friction coefficients indicate the potential utility of SRP materials for thin film low friction applications.…”

Section: Friction Analysismentioning

confidence: 77%

Nanomechanical and surface frictional characteristics of a copolymer based on benzoyl-1,4-phenylene and 1,3-phenylene

Morgan¹,

Misra²,

Jones³

2006

Polymer

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Nanotribological characterization of industrial polytetrafluorethylene-based coatings by atomic force microscopy

Cited by 11 publications

References 26 publications

Vapors in the ambient—A complication in tribological studies or an engineering solution of tribological problems?

Vapors in the ambient—A complication in tribological studies or an engineering solution of tribological problems?

An in situ tribometer for measuring friction and wear of polymers in a high pressure hydrogen environment

Nanomechanical and surface frictional characteristics of a copolymer based on benzoyl-1,4-phenylene and 1,3-phenylene

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