Friction reducing effect of multiply adsorptive organic polymer

Tohyama, Mamoru; Ohmori, Takao; Murase, Atsushi; Masuko, Masabumi

doi:10.1016/j.triboint.2008.12.012

Cited by 44 publications

(37 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Recent studies have indicated that functionalized polymers were effective for reducing friction under low speed conditions due to the formation of an adsorption film by the polymer molecules [8][9][10][11]. A functionalized PMA, copolymerized with alkylmethacrylates and functionalized methacrylate monomers, may have formed thicker and more viscous boundary films by adsorption of the functional groups.…”

Section: Introductionmentioning

confidence: 99%

The Role of Asperity Geometry and Roughness Orientation for the Friction-Reducing Effect of Adsorbed Molecular Films

2016

Self Cite

View full text Add to dashboard Cite

The influence of roughness orientation on the friction-speed characteristics of adsorbed films was investigated by changing the angle of the anisotropically striated roughness to the sliding direction of the counter surface. As the angle of the striated roughness becomes perpendicular to the sliding direction, the friction coefficient is decreased. The friction-speed characteristics of the adsorbed film in the transverse direction of the striated roughness having different height or shape of asperities were also investigated. The friction coefficient obtained in the low speed region decreased with increasing arithmetic mean peak curvature (S pc ) when stearic acid-formulated oil was used as a lubricant oil. The results demonstrated that the roughness orientation and the asperity shape of the transverse roughness were key factors for generating additional load-bearing pressure so that the adsorbed films could exert their intrinsic friction-reducing effects.

show abstract

Section: Introductionmentioning

confidence: 99%

The Role of Asperity Geometry and Roughness Orientation for the Friction-Reducing Effect of Adsorbed Molecular Films

2016

Self Cite

View full text Add to dashboard Cite

show abstract

“…Conventionally, a major technical approach to controlling friction is to modify the surface interactions of the solids; low-friction surface coatings and lubrication additives are good examples of this approach in improving tribological performance [22,23]. Other authors recently reported an interesting friction modification induced by varying the van der Waals surface interaction due to changing SiO 2 thickness, although their approach is categorized as modification of the surface interactions [24].…”

Section: Discussionmentioning

confidence: 99%

Friction Modification by Shifting of Phonon Energy Dissipation in Solid Atoms

et al. 2015

Self Cite

View full text Add to dashboard Cite

Numerous researchers have focused on the relation between kinetic friction and the surface properties of materials, such as their surface roughness and chemical state, because kinetic friction is the loss of kinetic energy at a sliding interface. Contrary to conventional wisdom, recent theory has predicated that, given the fact of phonon energy dissipation, kinetic friction depends on the properties of bulk atoms in a solid, not only on the surface properties. However, this expectation has not been proven. Here we show evidence of this idea via atomic-scale experiments and simulations. We compared the kinetic frictions of isotopically distinct single-crystal diamonds, which differ only in atomic mass, using atomic force microscopy and observed that the friction of 13 C diamond is lower than that of 12 C diamond by approximately 3%. Simulations and theoretical analysis reproduce this result well, suggesting that the lower friction of 13 C diamond originates from the inhibition of the energy-dissipative phonon by a heavier atom mass. This discovery provides a design concept of low-friction materials by tuning the energy-dissipation process with modification of the inner-solid properties; i.e. phonon properties.

show abstract

“…on the metal surface. But recently ToF-SIMS analysis of tribo-films formed on wear surfaces provided direct evidence of the adsorption of a polar ester structure found in a polymethacylate, a viscosity index improver, leading to the conclusion that the adsorbed species reduced the friction coefficient [17]. A few other researchers also showed similar evidence of adsorption of glycerol monoleate friction modifier on a wear surface using ToF-SIMS [18,19].…”

Section: Tribo-film Analysismentioning

confidence: 95%

Opportunities and Challenges with Polyalkylene Glycol for Engine Oil Application

Gangopadhyay

Cuthbert

2018

Lubricants

View full text Add to dashboard Cite

Abstract:Base oil plays an important role in engine oil formulation in delivering overall performance attributes in addition to additives. Non-traditional base oil like polyalkylene glycol (PAG) did not get much attention in the past for formulating automotive engine oil. This investigation explored PAGs for enhancing engine oil performance primarily for fuel economy benefit over traditional mineral oil-based formulations. This paper highlights key findings from an extensive investigation, parts of which were published in detail elsewhere, and identifying opportunities and challenges. Several PAG chemistries were investigated depending on their feedstock material. Friction performance was evaluated by several methods starting with laboratory bench tests to engine components to chassis roll dynamometer tests. Durability was also evaluated from laboratory bench tests to engine components to ASTM sequence tests. The investigation revealed that significant friction reduction or fuel economy gain can be achieved with PAG oil but wear protection capability, piston deposit, and varnish require much improvement requiring identification/development of additive components. A few alternative routes for performance improvement are suggested.

show abstract

Friction reducing effect of multiply adsorptive organic polymer

Cited by 44 publications

References 11 publications

The Role of Asperity Geometry and Roughness Orientation for the Friction-Reducing Effect of Adsorbed Molecular Films

The Role of Asperity Geometry and Roughness Orientation for the Friction-Reducing Effect of Adsorbed Molecular Films

Friction Modification by Shifting of Phonon Energy Dissipation in Solid Atoms

Opportunities and Challenges with Polyalkylene Glycol for Engine Oil Application

Contact Info

Product

Resources

About