Stability of perfluoroalkylethers

Paciorek, K. J. L.; Kratzer, R.H.

doi:10.1016/0022-1139(93)02943-9

Cited by 50 publications

(17 citation statements)

References 29 publications

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“…Vureus et al [20] used low energy electrons to bombard PFPEs and observed that the electron decomposition of PFPEs occurs at an energy below their ionization potential (about 14 eV). It is well known that, in the presence of metal and metal oxide, the rapid degradation of PFPEs takes place at temperatures below their decomposition temperatures [21,22]. So, far, two different mechanisms have been reported: one is the decomposition caused by Lewis acid sites, [23,24] the other is the decomposition caused by nonLewis acid sites [25,26].…”

Section: Introductionmentioning

confidence: 99%

Study of the Thermal Decomposition of PFPEs Lubricants on a Thin DLC Film Using Finitely Extensible Nonlinear Elastic Potential Based Molecular Dynamics Simulation

Nath

Wong

2014

Journal of Nanotechnology

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Perfluoropolyethers (PFPEs) are widely used as hard disk lubricants for protecting carbon overcoat reducing friction between the hard disk interface and the head during the movement of head during reading and writing data in the hard disk. Due to temperature rise of PFPE Zdol lubricant molecules on a DLC surface, how polar end groups are detached from lubricant molecules during coating is described considering the effect of temperatures on the bond/break density of PFPE Zdol using the coarse-grained bead spring model based on finitely extensible nonlinear elastic potential. As PFPE Z contains no polar end groups, effects of temperature on the bond/break density (number of broken bonds/total number of bonds) are not so significant like PFPE Zdol. Effects of temperature on the bond/break density of PFPE Z on DLC surface are also discussed with the help of graphical results. How bond/break phenomenonaffects the end bead density of PFPE Z and PFPE Zdol on DLC surface is discussed elaborately. How the overall bond length of PFPE Zdol increases with the increase of temperature which is responsible for its decomposition is discussed with the help of graphical results. At HAMR condition, as PFPE Z and PFPE Zdol are not suitable lubricant on a hard disk surface, it needs more investigations to obtain suitable lubricant. We study the effect of breaking of bonds of nonfunctional lubricant PFPE Z, functional lubricants such as PFPE Zdol and PFPE Ztetrao, and multidented functional lubricants such as ARJ-DS, ARJ-DD, and OHJ-DS on a DLC substrate with the increase of temperature when heating of all of the lubricants on a DLC substrate is carried out isothermally using the coarse-grained bead spring model by molecular dynamics simulations and suitable lubricant is selected which is suitable on a DLC substrate at high temperature.

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Section: Introductionmentioning

confidence: 99%

Study of the Thermal Decomposition of PFPEs Lubricants on a Thin DLC Film Using Finitely Extensible Nonlinear Elastic Potential Based Molecular Dynamics Simulation

Nath

Wong

2014

Journal of Nanotechnology

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“…Many studies have been performed with Fomblin Z® type lubricants since they have the best temperature-viscosity characteristics of the commercially available lubricants [7]. The problem is they have the worst thermo-oxidative stability in the presence of metals and alloys [8].…”

Section: Fomblin Z®mentioning

confidence: 99%

“…Comparing hydrocarbon chemistry in oxidative environments, hydrocarbons have the tendency to form water and OH radicals via a free radical process. This situation does not apply to perfluorinated compounds due to the resistance of the C-F bond to the attack by free radicals and the thermodynamic instability of OF 2 and OF species [6,7]. This renders PFPAEs JOURNAL OF SYNTHETIC LUBRICATION…”

mentioning

confidence: 99%

A review of the effect of metals on the thermo-oxidative stability of perfluoropolyalkylether lubricants

Hellman

Gschwender

Snyder

2006

J. Synthetic Lubrication

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The structural attributes and degradation mechanisms are reviewed for Fomblin Z®, Demnum , and space applications such as in satellites [4]. The backbone of the molecule contains only single bonds which allow free rotation of the backbone atoms producing a fluid with excellent viscosity characteristics. The high temperature oxidative stability is partly due to their high molecular weight and the shielding effect the highly electro-negative fluorine atoms have on protecting the carbon/oxygen backbone [5]. Comparing hydrocarbon chemistry in oxidative environments, hydrocarbons have the tendency to form water and OH radicals via a free radical process. This situation does not apply to perfluorinated compounds due to the resistance of the C-F bond to the attack by free radicals and the thermodynamic instability of OF 2 and OF species [6,7]. This renders PFPAEs JOURNAL OF SYNTHETIC LUBRICATION

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“…These lubricants are found in service areas such as aerospace, automotive, industrial machinery, magnetic recording, pulp and paper, textiles, and vacuum systems [1][2][3]. One disadvantage of PFPAEs is their reactivity with metal surfaces.…”

Section: Introductionmentioning

confidence: 99%