Thermal Decomposition Kinetics of Polyol Ester Lubricants

Urness, Kimberly N.; Gough, R. V.; Widegren, Jason A.; Bruno, Thomas J.

doi:10.1021/acs.energyfuels.6b01863

Cited by 19 publications

(27 citation statements)

References 34 publications

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“…The liquids were provided by the Naval Air Systems Command (NAVAIR). Compositional analyses of the sample liquids were performed at NIST Boulder with methods and results being presented in detail by Urness et al [11]. The base oils had purities of 96.7 % (POE-5), 97.3 % (POE-7), and 93.0 % (POE-9) by mole.…”

Section: Sample Preparation and Puritymentioning

confidence: 99%

“…In this project, the properties of three pentaerythritol tetraalkanoate esters and a fully formulated, MIL-PRF-23699-qualified sample were investigated as aviation lubricants. Thermal decomposition kinetics data and wide-ranging density data have been published previously [11,12]. This paper reports about the viscosity measurements that were carried out with an oscillating piston viscometer (OPV) in the overall temperature range from 275 K to 450 K with pressures up to 137 MPa and in a viscosity range from 1 mPa•s to 100 mPa•s.…”

Section: Introductionmentioning

confidence: 99%

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Viscosity Measurements of Three Base Oils and One Fully Formulated Lubricant and New Viscosity Correlations for the Calibration Liquid Squalane

Laesecke

Junker

Lauria

2019

J. RES. NATL. INST. STAN.

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The viscosities of three pentaerythritol tetraalkanoate ester base oils and one fully formulated lubricant were measured with an oscillating piston viscometer in the overall temperature range from 275 K to 450 K with pressures up to 137 MPa. The alkanoates were pentanoate, heptanoate, and nonanoate. Three sensing cylinders covering the combined viscosity range from 1 mPa·s to 100 mPa·s were calibrated with squalane. This required a re-correlation of a squalane viscosity data set in the literature that was measured with a vibrating wire viscometer, with an estimated extended uncertainty of 2 %, because the squalane viscosity formulations in the literature did not represent this data set within its experimental uncertainty. In addition, a new formulation for the viscosity of squalane at atmospheric pressure was developed that represents experimental data from 169.5 K to 473 K within their estimated uncertainty over a viscosity range of more than eleven orders of magnitude. The viscosity of squalane was measured over the entire viscometer range, and the results were used together with the squalane correlations to develop accurate calibrating functions for the instrument. The throughput of the instrument was tripled by a custom-developed LabVIEW application. The measured viscosity data for the ester base oils and the fully formulated lubricant were tabulated and compared with literature data. An unpublished viscosity data set for pentaerythritol tetrapentanoate measured in this laboratory in 2006 at atmospheric pressure from 253 K to 373 K agrees with the new data within their experimental uncertainty and confirms the deviations from the literature data. The density data measured in this project for the three base oils deviate from the literature data in a way that is by sign and magnitude consistent with the deviations of the viscosity data. This points to differences in the sample compositions as the most likely cause for the deviations.

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Section: Sample Preparation and Puritymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Viscosity Measurements of Three Base Oils and One Fully Formulated Lubricant and New Viscosity Correlations for the Calibration Liquid Squalane

Laesecke

Junker

Lauria

2019

J. RES. NATL. INST. STAN.

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“…The cells were passivated by several cycles of heating the reactors loaded with the polyol esters followed by cleaning to build up a sufficient surface oxide layer. A more detailed discussion of catalytic decomposition of these polyol esters is presented in Urness et al [3].…”

Section: Discussionmentioning

confidence: 99%

“…The reactor cell and thermostated block for temperature control are described in more detail elsewhere. [3,4]…”

Section: Methodsmentioning

confidence: 99%

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Thermophysical properties of polyol ester lubricants

Bruno¹,

Fortin²,

Huber³

et al. 2019

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This report summarizes the results of work performed for the Naval Air Warfare Center Aircraft Division by the National Institute of Standards and Technology (NIST), Applied Chemicals and Materials Division on the properties of polyol ester lubricants under interagency agreement number N0042115IP00008. The work includes purity analysis and assessment, decomposition studies, experimental measurements on density, isobaric heat capacity, speed of sound, vapor pressure, viscosity, thermal conductivity, and distillation curve measurements. Models were developed for the thermodynamic properties, viscosity, and thermal conductivity that represent these properties to nearly within their experimental uncertainty for three pure polyol ester base fluids (pentaerythritol tetrapentanoate (POE5), pentaerythritol tetraheptanoate (POE7), pentaerythritol tetranonanoate (POE9), and a fully qualified lubricant meeting military specification MIL-PRF-23699.

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