Lubrication of Polymers

Rubenstein, C.

doi:10.1063/1.1728376

Cited by 40 publications

(10 citation statements)

References 25 publications

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“…He suggested that the increase in the contact area is the more significant effect so that the aqueous lubrication character is rather poor [10,11]. This latter effect has been confirmed within the considered contact as detailed in Ref.…”

Section: Abrasive Wear Tests and Experimental Proceduresmentioning

confidence: 60%

Abrasive wear micromechanisms of oriented polymers

Cayer-Barrioz¹,

Mazuyer²,

Kapsa³

et al. 2004

Polymer

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Section: Abrasive Wear Tests and Experimental Proceduresmentioning

confidence: 60%

Abrasive wear micromechanisms of oriented polymers

Cayer-Barrioz¹,

Mazuyer²,

Kapsa³

et al. 2004

Polymer

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“…Such an initiation and development of fatigue cracks under a load would then lead to fatigue wear of the PTFE composites. This, in turn, reduces the mechanical strength and load‐supporting capacity of PTFE composites and, hence, deteriorates the tribological behavior of the PTFE composites under higher loads 10–12. Accordingly, it was supposed that the good solid compatibility between PTFE and metal powders (such as Cu, Pb, and Ni) as fillers accounts for the excellent tribological behavior of Cu‐, Pb‐, and Ni‐filled PTFE composites.…”

Section: Resultsmentioning

confidence: 99%

“…Our previous work indicated that PTFE and its composites filled with various inorganic fillers registered a considerably high friction coefficient and/or wear at a certain high load 8, 9. It was suggested that under lubrication with liquid paraffin the absorption and osmosis of liquid paraffin into the microdefects in the PTFE composites reduces the mechanical strength and load‐supporting capacity of PTFE composites 10–12. This would lead to the deterioration of the tribological behavior of PTFE composites under higher loads as lubricated by liquid paraffin.…”

Section: Introductionmentioning

confidence: 99%

Effects of various kinds of fillers on the tribological behavior of polytetrafluoroethylene composites under dry and oil‐lubricated conditions

Zhang

Liu

Xue

2001

J of Applied Polymer Sci

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Polytetrafluoroethylene (PTFE)-based composites filled with various inorganic fillers in a volume fraction of 30% were prepared. The tribological behavior of the PTFE composites sliding against AISI52100 steel under dry and liquid paraffin-lubricated conditions was investigated on an MHK-500 model ring-on-block test rig. The morphologies of worn surfaces and wear debris were observed with a scanning electron microscope (SEM) and an optical microscope. As the results, different fillers show different effects on the tribological behavior of the PTFE composites, while the composite shows much different tribological behavior under lubricated conditions as compared with dry sliding. The tribological behavior of the PTFE composites under dry sliding is greatly related to the uniformity and thickness of the transfer films. Only the PTFE composites with a transfer film of good uniformity and proper thickness may have excellent tribological behavior. The PTFE composites show much better tribological behavior under lubrication of liquid paraffin than under dry sliding, namely, the friction coefficients are decreased by 1 order of magnitude and the wear rate by 1-3 orders of magnitude. Observation of the worn composite surfaces with SEM indicates that fatigue cracks were generated under lubrication of liquid paraffin, owing to the absorption and osmosis of liquid paraffin into the microdefects of the PTFE composites. The creation and development of the fatigue cracks led to fatigue wear of the PTFE composites. This would reduce the mechanical strength and load-supporting capacity of the PTFE composites. Therefore, the tribological behavior of the PTFE composites under lubrication of liquid paraffin is greatly dependent on the compatibility between the PTFE matrix and the inorganic fillers. In other words, the better is the compatibility between PTFE and fillers the better is the tribological behavior of the composites.

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“…Under these conditions, 10 pulses are able to produce a ®lm about 10 nm thick. 3 The ®lms prepared by either procedure were washed carefully with water and methanol and dried in a stream of air at room temperature. The ®lm thickness was estimated by a TALYSURF 5 stylus instrument.…”

Section: Methodsmentioning

confidence: 99%

“…Since boundary lubrication occurs as a consequence of molecular adsorption, lubrication becomes more eective with longer-chain molecules until an optimum is achieved. 3 The highviscosity lubricants derived from a homologous series of compounds tend to increase the drag force; in addition, adsorption and absorption of lubricants may also cause chemical changes and plasticisation of the polymer surface. This has two implications: the shear strength reduces to give a low friction coecient or there may be observed an increased wear due to ®lm transfer 4 and additional drag forces due to the lubricant.…”

Section: Introductionmentioning

confidence: 99%

Effect of dopant counter-anion on tribological properties of polypyrrole

Chyla

Ryley

Walton

et al. 1998

Adv. Mater. Opt. Electron.

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It is known that, with careful control of conditions, polypyrrole films with counter‐ions of toluene sulphonic acid sodium salt and methane phosphonic acid sodium salt can be produced with friction coefficients comparable with or even better than PTFE. Here we now report a systematic study of polypyrrole with various planar anions for tribological bearing applications. Thus naphthalene disulphonate‐doped polypyrrole has a kind of laminar structure with very good adhesion to the surface. Polymer films were electrodeposited on glass lenses and tested in a friction apparatus for friction and wear measurements. The film orientation was measured by low‐angle X‐ray diffraction and the surface structure was evaluated by both AFM and SEM for different film thicknesses. The friction coefficient and wear rate of such bearings were measured under loads up to 5 N and at speeds up to 30 mm s−1 and were found to be 0·06 and 0·04 nm mm−1 respectively. © 1998 John Wiley & Sons, Ltd.

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Lubrication of Polymers

Cited by 40 publications

References 25 publications

Abrasive wear micromechanisms of oriented polymers

Abrasive wear micromechanisms of oriented polymers

Effects of various kinds of fillers on the tribological behavior of polytetrafluoroethylene composites under dry and oil‐lubricated conditions

Effect of dopant counter-anion on tribological properties of polypyrrole

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