Correlating viscosity of 2-ethylhexyl oleic estolide esters to their molecular weight

Bantchev, Grigor B.; Cermak, Steven C.

doi:10.1016/j.fuel.2021.122190

Cited by 5 publications

(2 citation statements)

References 46 publications

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“…The modification was that the sample was injected into the measuring chambers at 15 • C, and the instrument was programmed to measure viscosities and densities at 15,20,25,30,40,50,60,70,80,90,100,110, and 120 • C. The injections and the following measurements were carried out in triplicate. Afterwards, the viscosity data were fitted to three temperature-viscosity models: Avramov-Milchev [55], Mauro-Yue-Ellison-Gupta-Allan [56], and Vogel-Fulcher-Tammann-Hesse [57] as described previously [58]. The Avramov-Milchev (AM) model fitted the best most of the datasets, despite that the differences between the models were small.…”

Section: Methodsmentioning

confidence: 99%

Cold-Flow Properties of Estolides: The Older (D97 and D2500) versus the Mini-(D5773 and D5949) Methods

Bantchev,

Ngo,

Chen

et al. 2024

Lubricants

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There is growing research on developing new and sustainable lubricants. Sustainable lubricants with adequate cold-flow properties are of particular interest for many applications. One limitation of the established methods for measuring cold flow properties is the large volume needed to test samples. This makes initial screening of many hard-to-synthesize samples difficult. In the current study, we compared the results of the older, widely accepted ASTM methods D97 (pour point, PP) and D2500 (cloud point, CP) to the newer, smaller-volume, and easier-to-perform methods D5949 and D5773 for bio-based base oils (estolides and iso-estolides). The CP results were in good agreement for less colored samples, but D5773 gave lower values for some darker (Gardner color >8) samples, especially esters. The D5949 showed a tendency to report slightly higher PP, especially for the lower values. Viscosities and densities in a wide temperature range (15 to 120 °C) were also measured. The surface tensions were estimated by a literature group method. Viscosity and density effects can only partially explain the differences in the PP values from the two methods. In conclusion, the newer mini-methods are an acceptable substitution when larger volumes are not accessible, unless the sample is too dark.

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Section: Methodsmentioning

confidence: 99%

Cold-Flow Properties of Estolides: The Older (D97 and D2500) versus the Mini-(D5773 and D5949) Methods

Bantchev,

Ngo,

Chen

et al. 2024

Lubricants

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“…Obviously, as the main components of OEEs, alkyl side chains and glycol chains are closely related to their physicochemical and tribological properties. Previous research has found that molecular weight (MW) [12], chain length [13,14], and glycol number [15] can affect the thermal stability, physicochemical properties, and mechanical behavior of OEEs. Raof et al [16] revealed that carbon chain length and branching had a positive effect on the oxidative stability of ester oils.…”

Section: Introductionmentioning

confidence: 99%

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

Wang,

Wen

et al. 2023

Friction

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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.

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Advanced Characterization of Estolides from Coconut, Sunflower and Karanja Oils

Maneesh Kumar,

Jagadeesha

2023

Advances in Sustainability Science and Technology

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Correlating viscosity of 2-ethylhexyl oleic estolide esters to their molecular weight

Cited by 5 publications

References 46 publications

Cold-Flow Properties of Estolides: The Older (D97 and D2500) versus the Mini-(D5773 and D5949) Methods

Cold-Flow Properties of Estolides: The Older (D97 and D2500) versus the Mini-(D5773 and D5949) Methods

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

Advanced Characterization of Estolides from Coconut, Sunflower and Karanja Oils

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