Molecular Dynamics of Synthetic-Based Lubricant System by Spectroscopic Techniques-Part 1

This article describes the structure-property relationships of synthetic pentaerythritol polyol esters (PEE) and polyalphaolefins (PAO) as established by the diffusion and mobility measurement and tilt angle results obtained by nuclear magnetic resonance (NMR) and infrared (IR) spectroscopic techniq...

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Bibliographic Details
Published in:Tribology transactions 2013-05, Vol.56 (3), p.442-452
Main Authors: Sarpal, A. S., Sastry, M. I. S., Kumar, Ravindra, Bhadhavath, Sanker, Rai, Kavita, Bansal, V., Patel, M. B.
Format: Article
Language:English
Subjects:
Cross-disciplinary physics: materials science
rheology
Diffusion
EHD
Elastohydrodynamic lubrication
Exact sciences and technology
Friction, lubrication, and wear
Hydrodynamic Volume
Materials science
Molecular structure
NMR
Physics
Polyol Esters
Pressure-Viscosity Coefficient
Spectrum analysis
Structure-Property Relationship
Synthetic Base Oil
Treatment of materials and its effects on microstructure and properties
Viscosity
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Summary:This article describes the structure-property relationships of synthetic pentaerythritol polyol esters (PEE) and polyalphaolefins (PAO) as established by the diffusion and mobility measurement and tilt angle results obtained by nuclear magnetic resonance (NMR) and infrared (IR) spectroscopic techniques, respectively. The diffusion coefficients (D) were found to be dependent on the molecular structure, alkyl chain length, shape and size, hydrodynamic volume, and alignment of the molecules in a lubricant system constituting these base stocks. The viscosity-temperature and viscosity-pressure properties such as viscosity index (VI), pour point (PP), elastohydrodynamic (EHD) film thickness, pressure-viscosity coefficient (α), hydrodynamic volume, and radius are explained on the basis of the variation in D with temperature and tilt angle on the smooth surfaces. The study has enabled us to propose a molecular structure of a synthetic molecule that can be molecularly engineered to have high-performance physicochemical properties.
ISSN:1040-2004
1547-397X
DOI:10.1080/10402004.2011.651772