Via Performance to Degradation: Oxidation Mechanism of Biodegradable Polyalphaolefin Base Oil for Electric Drive Systems
Year: 2025
Type: article
Abstract: An additive-free, low-viscosity polyalphaolefin (PAO) has been oxidized under pure oxygen at elevated pressure and temperature. This biodegradable PAO base oil is a promising candidate for use as a motor-gear lubricant in electrical drive systems. The oxidation behavior is systematically investigated to evaluate its thermal stability and long-term performance. Rheological measurements are performed to assess viscosity, water content is quantified, tribological tests determine the coefficient of friction, and Fourier-transform infrared spectroscopy is used to monitor chemical changes during oxidation. All analytical methods consistently revealed a two-step oxidative degradation process. It is proposed that the first stage involves the formation of carbonyl compounds and water without compromising lubrication properties, while the second stage-triggered by hydrolysis of oxidation products-leads to chain scission and initiates the desired degradation. This two-stage mechanism is discussed in the context of technological functionality and sustainability requirements for next-generation electric drive lubricants.
Source: ChemPlusChem
Authors: Elisabeth Distler, Joachim Albrecht, Kevin Holderied, Didem Cansu Güney, Markus Kiefel, Katharina Weber
Institution: Hochschule Aalen
Language: English
Subfield: Mechanical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $4,030
OpenAlex ID: W4415460484