Chromatographic and non‐chromatographic characterization of poly‐α‐olefins

Voelkel, Adam; Fall, J.

doi:10.1002/jsl.31

Cited by 5 publications

(2 citation statements)

References 25 publications

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“…In the available literature on the subject, the authors undertake numerous and various studies focused on oil analysis, but there is a significant shortage of publications describing the topic of paper chromatography and its practical use for the assessment of oil condition [19,24]. Whereas, paper chromatography allows for a quick assessment of the condition of the oil, without the need to take a large volume of oil from the engine.…”

Section: Monitoring Changes In Engine Oil During Operation Playsmentioning

confidence: 99%

Assessment of the suitability of paper chromatography for quick diagnostics of the operating condition of engine oil

Molenda¹,

Wolak²,

Zając³

et al. 2023

Eksploatacja i Niezawodność – Maintenance and Reliability

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Paper chromatography is a method that allows rapid assessment of the condition and identification of fuel, water and soot contaminants in engine oil. The paper contains an analysis of the suitability of rapid paper chromatography for assessing the operating quality of engine oil. It takes into account the comparison of physicochemical parameters by classical methods with the quality of commercial paper chromatography. The presented research allowed verifying the suitability of paper chromatography for laboratory evaluation of engine oil quality. It was found that a more extensive analysis of the oil condition is possible provided that the chromatographic separation time of oil dispensed onto filter paper is increased from 1 minute to 40 minutes. Linear relationships were observed between the surface area of the stain core after 40-minute separation and selected viscosity parameters (e.g. kinematic viscosity measured at 40° C). Based on rapid paper chromatography, it was found that reasonable decisions can be made about the quality of engine oil, and thus about replacement or further use of the oil.

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Section: Monitoring Changes In Engine Oil During Operation Playsmentioning

confidence: 99%

Assessment of the suitability of paper chromatography for quick diagnostics of the operating condition of engine oil

Molenda¹,

Wolak²,

Zając³

et al. 2023

Eksploatacja i Niezawodność – Maintenance and Reliability

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“…In turn, sample #36 may contain admixtures of various types of base oils (Group II and Group III-API base oil) in its composition. This is especially visible through clear peaks corresponding to components (poly-alpha-olefins-PAOs) of a different chemical nature in comparison to other components [36][37][38]. A different slope of the graphs in terms of signal to retention time observed in the range from 15 to 20 min (sample #36), and a much higher signal level (sample #36) in the retention time range from 15 to 25 min, confirm that there are significant differences in the composition of the engine oils tested [39].…”

Section: The Chromatographic Analysismentioning

confidence: 99%

Experimental Investigation of the Viscosity Parameters Ranges—Case Study of Engine Oils in the Selected Viscosity Grade

et al. 2020

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The primary objective of the research was to compare the viscosity parameters of the same viscosity grade engine oils, as declared by the manufacturers, to the actual laboratory measurements. The secondary objective was to briefly investigate (1) what kind of information oil manufacturers provide in the product data sheets of the studied oils, and (2) the potential savings resulting from the use of the energy efficient oils. The study material consisted of 42 selected synthetic engine oils that belong to the 5W-30 viscosity grade. Stabinger SVM 3001 viscometer was used to determine kinematic viscosity at −20 °C, 40 °C, 100 °C and 130 °C. The HTHS (high temperature high shear), CCS (cold cranking simulator), FTIR (Fourier-transform infrared spectroscopy) and GC (Gas Chromatography) measurements were also performed for the samples that had the lowest and the highest kinematic viscosity. Large differences (5–25%) between oil producers’ declarations and the results of laboratory tests were found. Although all of the engine oils tested met the 5W-30 grade standards, the high variability of viscosity measurements needs to be reported. The difference between the oil with the highest and the oil with the lowest kinematic viscosity at −20 °C was 11,804 mm2/s. The outlying temperature-related viscosity profiles were recovered using Mahalanobis distances which identified 16 out of 42 analyzed oil samples as atypical.

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Partition coefficients for a mixture of two lubricant oligomers

Kanniah

Forbus²,

Parker³

et al. 2011

J of Applied Polymer Sci

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Universal base oils that remain pourable over wide temperature ranges would have important advantages for lubrication applications. The model system used in this project was a poly(a-olefin) synthetic base oil modified with polydimethylsiloxane (PDMS) to lower the pour-point temperature. Although the blend was miscible at room temperature, phase separation occurred at temperatures lower than 258 K. Partition coefficients of such nonideal oligomer mixtures can (1) help define operating temperature ranges and (2) provide a basis for designing molecular weight distributions of each lubricant that control or prevent phase separation. The poly(a-olefin) base oil family is branched oligomers with two to five n-mers at levels greater than 1 wt %, whereas PDMS additives are linear oligomers having between 10 and 50 sequential n-mers at levels greater than 0.5 wt %. In this study, Fourier transform infrared measurements of the poly(a-olefin) and PDMS compositions in each phase provided an overall material balance. Poly(a-olefin) oligomers were detected with size exclusion chromatography with a differential refractive-index detector, and PDMS oligomers were detected with matrix-assisted laser desorption/ionizationtime-of-flight mass spectrometry. The best sets of measurements for the individual oligomers in each phase were selected by minimization of the overall material balance errors. For both oligomers, components with high molecular weights were preferentially excluded from the phase rich in the other polymer and were relatively independent of temperature. The partition coefficients of poly(a-olefin) components increased with increasing oligomer length, whereas the partition coefficients of the PDMS components decreased with increasing oligomer length.

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Chromatographic and non‐chromatographic characterization of poly‐α‐olefins

Cited by 5 publications

References 25 publications

Assessment of the suitability of paper chromatography for quick diagnostics of the operating condition of engine oil

Assessment of the suitability of paper chromatography for quick diagnostics of the operating condition of engine oil

Experimental Investigation of the Viscosity Parameters Ranges—Case Study of Engine Oils in the Selected Viscosity Grade

Partition coefficients for a mixture of two lubricant oligomers

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