Investigation of shear-Thinning behavior on film thickness and friction coefficient of polyalphaolefin base fluids with varying olefin copolymer content

J. Zolper Thomas; Yifeng He; Massimiliano Delferro; Paul Shiller; Gary Doll; Babak Lotfizadeh Dehkordi; Ning Ren; Frances Lockwood; Tobin J. Marks; Yip Wah Chung; Aaron Greco; Ali Erdemir; Qian Wang

doi:10.1115/1.4033716

Investigation of shear-Thinning behavior on film thickness and friction coefficient of polyalphaolefin base fluids with varying olefin copolymer content

J. Zolper Thomas^*, Yifeng He, Massimiliano Delferro, Paul Shiller, Gary Doll, Babak Lotfizadeh Dehkordi, Ning Ren, Frances Lockwood, Tobin J. Marks, Yip Wah Chung, Aaron Greco, Ali Erdemir, Qian Wang

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

This study investigates the rheological properties, elastohydrodynamic (EHD) filmforming capability, and friction coefficients of low molecular mass poly-A-olefin (PAO) base stocks with varying contents of high molecular mass olefin copolymers (OCPs) to assess their shear stability and their potential for energy-efficient lubrication. Several PAO-OCP mixtures were blended in order to examine the relationship between their additive content and tribological performance. Gel permeation chromatography (GPC) and nuclear magnetic resonance (NMR) spectroscopy were used to characterize the molecular masses and structures, respectively. Density, viscosity, EHD film thickness, and friction were measured at 303 K, 348 K, and 398 K. Film thickness and friction were studied at entrainment speeds relevant to the boundary, mixed, and full-film lubrication regimes. The PAO-OCP mixtures underwent temporary shear-Thinning resulting in decreases in film thickness and hydrodynamic friction. These results demonstrate that the shear characteristics of PAO-OCP mixtures can be tuned with the OCP content and provide insight into the effects of additives on EHD characteristics.

Original language	English (US)
Article number	021504
Journal	Journal of Tribology
Volume	139
Issue number	2
DOIs	https://doi.org/10.1115/1.4033716
State	Published - Apr 1 2017

Keywords

elastohydrodynamic lubrication
fluid friction (traction)
lubricant additives
viscosity

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Surfaces and Interfaces
Surfaces, Coatings and Films

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10.1115/1.4033716

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Thomas, J. Z., He, Y., Delferro, M., Shiller, P., Doll, G., Dehkordi, B. L., Ren, N., Lockwood, F., Marks, T. J., Chung, Y. W., Greco, A., Erdemir, A., & Wang, Q. (2017). Investigation of shear-Thinning behavior on film thickness and friction coefficient of polyalphaolefin base fluids with varying olefin copolymer content. Journal of Tribology, 139(2), Article 021504. https://doi.org/10.1115/1.4033716

@article{244994bc36404fdab91db664675b3a60,

title = "Investigation of shear-Thinning behavior on film thickness and friction coefficient of polyalphaolefin base fluids with varying olefin copolymer content",

abstract = "This study investigates the rheological properties, elastohydrodynamic (EHD) filmforming capability, and friction coefficients of low molecular mass poly-A-olefin (PAO) base stocks with varying contents of high molecular mass olefin copolymers (OCPs) to assess their shear stability and their potential for energy-efficient lubrication. Several PAO-OCP mixtures were blended in order to examine the relationship between their additive content and tribological performance. Gel permeation chromatography (GPC) and nuclear magnetic resonance (NMR) spectroscopy were used to characterize the molecular masses and structures, respectively. Density, viscosity, EHD film thickness, and friction were measured at 303 K, 348 K, and 398 K. Film thickness and friction were studied at entrainment speeds relevant to the boundary, mixed, and full-film lubrication regimes. The PAO-OCP mixtures underwent temporary shear-Thinning resulting in decreases in film thickness and hydrodynamic friction. These results demonstrate that the shear characteristics of PAO-OCP mixtures can be tuned with the OCP content and provide insight into the effects of additives on EHD characteristics.",

keywords = "elastohydrodynamic lubrication, fluid friction (traction), lubricant additives, viscosity",

author = "Thomas, {J. Zolper} and Yifeng He and Massimiliano Delferro and Paul Shiller and Gary Doll and Dehkordi, {Babak Lotfizadeh} and Ning Ren and Frances Lockwood and Marks, {Tobin J.} and Chung, {Yip Wah} and Aaron Greco and Ali Erdemir and Qian Wang",

note = "Funding Information: Research at Northwestern University and Argonne National Laboratory was supported by U.S. Department of Energy (DOE; Grant No. DE-EE0006449). The authors also thank Ashland, Inc., for partial support of this research. Purchases of the NMR instrumentation at the Northwestern Integrated Molecular Structure Education and Research Center (IMSERC) at NU were supported by NSF Grant No. CHE-1048773. Publisher Copyright: Copyright {\textcopyright} 2017 by ASME.",

year = "2017",

month = apr,

day = "1",

doi = "10.1115/1.4033716",

language = "English (US)",

volume = "139",

journal = "Journal of Tribology",

issn = "0742-4787",

publisher = "American Society of Mechanical Engineers(ASME)",

number = "2",

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Thomas, JZ, He, Y, Delferro, M, Shiller, P, Doll, G, Dehkordi, BL, Ren, N, Lockwood, F, Marks, TJ , Chung, YW, Greco, A, Erdemir, A & Wang, Q 2017, 'Investigation of shear-Thinning behavior on film thickness and friction coefficient of polyalphaolefin base fluids with varying olefin copolymer content', Journal of Tribology, vol. 139, no. 2, 021504. https://doi.org/10.1115/1.4033716

TY - JOUR

T1 - Investigation of shear-Thinning behavior on film thickness and friction coefficient of polyalphaolefin base fluids with varying olefin copolymer content

AU - Thomas, J. Zolper

AU - He, Yifeng

AU - Delferro, Massimiliano

AU - Shiller, Paul

AU - Doll, Gary

AU - Dehkordi, Babak Lotfizadeh

AU - Ren, Ning

AU - Lockwood, Frances

AU - Marks, Tobin J.

AU - Chung, Yip Wah

AU - Greco, Aaron

AU - Erdemir, Ali

AU - Wang, Qian

N1 - Funding Information: Research at Northwestern University and Argonne National Laboratory was supported by U.S. Department of Energy (DOE; Grant No. DE-EE0006449). The authors also thank Ashland, Inc., for partial support of this research. Purchases of the NMR instrumentation at the Northwestern Integrated Molecular Structure Education and Research Center (IMSERC) at NU were supported by NSF Grant No. CHE-1048773. Publisher Copyright: Copyright © 2017 by ASME.

PY - 2017/4/1

Y1 - 2017/4/1

N2 - This study investigates the rheological properties, elastohydrodynamic (EHD) filmforming capability, and friction coefficients of low molecular mass poly-A-olefin (PAO) base stocks with varying contents of high molecular mass olefin copolymers (OCPs) to assess their shear stability and their potential for energy-efficient lubrication. Several PAO-OCP mixtures were blended in order to examine the relationship between their additive content and tribological performance. Gel permeation chromatography (GPC) and nuclear magnetic resonance (NMR) spectroscopy were used to characterize the molecular masses and structures, respectively. Density, viscosity, EHD film thickness, and friction were measured at 303 K, 348 K, and 398 K. Film thickness and friction were studied at entrainment speeds relevant to the boundary, mixed, and full-film lubrication regimes. The PAO-OCP mixtures underwent temporary shear-Thinning resulting in decreases in film thickness and hydrodynamic friction. These results demonstrate that the shear characteristics of PAO-OCP mixtures can be tuned with the OCP content and provide insight into the effects of additives on EHD characteristics.

AB - This study investigates the rheological properties, elastohydrodynamic (EHD) filmforming capability, and friction coefficients of low molecular mass poly-A-olefin (PAO) base stocks with varying contents of high molecular mass olefin copolymers (OCPs) to assess their shear stability and their potential for energy-efficient lubrication. Several PAO-OCP mixtures were blended in order to examine the relationship between their additive content and tribological performance. Gel permeation chromatography (GPC) and nuclear magnetic resonance (NMR) spectroscopy were used to characterize the molecular masses and structures, respectively. Density, viscosity, EHD film thickness, and friction were measured at 303 K, 348 K, and 398 K. Film thickness and friction were studied at entrainment speeds relevant to the boundary, mixed, and full-film lubrication regimes. The PAO-OCP mixtures underwent temporary shear-Thinning resulting in decreases in film thickness and hydrodynamic friction. These results demonstrate that the shear characteristics of PAO-OCP mixtures can be tuned with the OCP content and provide insight into the effects of additives on EHD characteristics.

KW - elastohydrodynamic lubrication

KW - fluid friction (traction)

KW - lubricant additives

KW - viscosity

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UR - http://www.scopus.com/inward/citedby.url?scp=84982262150&partnerID=8YFLogxK

U2 - 10.1115/1.4033716

DO - 10.1115/1.4033716

M3 - Article

AN - SCOPUS:84982262150

SN - 0742-4787

VL - 139

JO - Journal of Tribology

JF - Journal of Tribology

IS - 2

M1 - 021504

ER -

Investigation of shear-Thinning behavior on film thickness and friction coefficient of polyalphaolefin base fluids with varying olefin copolymer content

Abstract

Keywords

ASJC Scopus subject areas

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