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Research Article | Open Access

Thermal-oxidation mechanism of dioctyl adipate base oil

Xuzheng QIAN1, Yaling XIANG, Hongfei SHANG2, Bingxue CHENG, Shengpeng ZHAN, Jian LI( )
State Key Laboratory of Special Surface Protection Materials and Application Technology, Wuhan Research Institute of Materials Protection, Wuhan 430030, China
State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China
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Abstract

The ester base oil of dioctyl adipate (DOA) was oxidized in an oven at 200 ℃ for 30 h, and variations in the physicochemical and tribological properties were studied. To investigate the thermal-oxidation mechanism, the thermal-oxidation products were analyzed by gas chromatography–mass spectrometry (GC−MS), and the thermal-oxidation process was simulated using visual reactive force field molecular dynamics (ReaxFF MD). The results indicated that the total acid number (TAN) increased significantly because of the presence of 14% carboxylic acids and low molecular weight monoesters. The tribological properties were improved by the formation of the strongly polar carboxylic acids. Additionally, the increase in kinematic viscosity was limited due to the formation of high molecular weight polymerization products and low molecular weight degradation products. Thermal-oxidative degradation and polymerization mechanisms were proposed by combining ReaxFF MD simulations and GC−MS results.

Keywords

dioctyl adipateGC−MSphysicochemical propertiestribological propertiesReaxFF MD

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Friction
Volume 4 Issue 1,
March 2016
Pages 29-38
DOI: 10.1007/s40544-015-0099-x

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Cite this article:
QIAN X, XIANG Y, SHANG H, et al. Thermal-oxidation mechanism of dioctyl adipate base oil. Friction, 2016, 4(1): 29-38. https://doi.org/10.1007/s40544-015-0099-x

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Received: 25 August 2015
Revised: 23 October 2015
Accepted: 26 November 2015
Published: 13 January 2016
© The author(s) 2015

This article is published with open access at Springerlink.com

Open Access: The articles published in this journal are distributed under the terms of the Creative Commons Attribution 4.0 International License (http:// creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.