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Research Article | Open Access

Low-viscosity oligoether esters (OEEs) as high-efficiency lubricating oils: Insight on their structure‒lubricity relationship

Hanwen WANG1,2, Ying WANG1, Ping WEN1, Lin MA1, Mingjin FAN1( ), Rui DONG1( ), Chunhua ZHANG2( )
Shaanxi Key Laboratory of Phytochemistry, College of Chemistry & Chemical Engineering, Baoji University of Arts and Sciences, Baoji 721013, China
Key Laboratory of Shaanxi Province for Development and Application of New Transportation Energy, Chang’an University, Xi’an 710064, China
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Abstract

Development of energy-efficient lubricants is a way to reduce energy consumption for transportation, with the tendency to design molecules that are beneficial in reducing the viscosity of synthetic oils. Oligoether esters (OEEs), as a low-viscosity ester base oil, have characteristics such as simple synthesis and excellent lubrication effect; however, the application of OEEs in tribology field has rarely been investigated. The objective of the present study is to investigate the effect of structure on the lubricating performance of OEEs and to develop a predictive model for OEEs based on quantitative structure‒property relationship (QSPR) through a combination of experiment and statistical modeling. Results showed that glycol chains contribute positively to lubrication with the ether functional groups increasing the sites of adsorption. Compared to branched-chain OEEs, straight-chain OEEs exhibited reduced wear, which was mainly due to the thicker adsorption film formed by the straight-chain structure. Furthermore, carbon films were detected on lightly worn surfaces, indicating that OEEs underwent oxidation during the friction process. Based on the results of principal component analysis (PCA) and partial least squares (PLS), it could be found that the predictive models of viscosity‒temperature performance, thermal stability performance, coefficient of friction (COF), and wear volume (WV) performed well and robustly. Among them, COF and WV can be best predicted with an R2 of about 0.90.

Keywords

oligoether esters (OEEs)low-viscosity esterfrictionwearquantitative structure–property relationship (QSPR)

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Friction
Volume 12 Issue 6,
June 2024
Pages 1133-1153
DOI: 10.1007/s40544-023-0765-3
Cite this article:
WANG H, WANG Y, WEN P, et al. Low-viscosity oligoether esters (OEEs) as high-efficiency lubricating oils: Insight on their structure‒lubricity relationship. Friction, 2024, 12(6): 1133-1153. https://doi.org/10.1007/s40544-023-0765-3

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Received: 12 January 2023
Revised: 16 February 2023
Accepted: 21 March 2023
Published: 01 December 2023
© The author(s) 2023.

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