TY  - JOUR
AB  - Purpose This paper aims to investigate the thermal oxidation characteristics of the unsaturated bonds (C=C) of trimethylolpropane trioleate (TMPTO) and to reveal the high temperature oxidation decay mechanism of unsaturated esters and the nature of the anti-oxidation properties of the additives.Design/methodology/approach Using a DXR laser microscopic Raman spectrometer and Linkam FTIR600 temperature control platform, the isothermal oxidation experiments of TMPTO with or without 1.0 wt. % of different antioxidants were performed.Findings The results indicated that the Raman peaks of =C-H, C=C and -CH2- weaken gradually with prolonged oxidation time, and the corresponding Raman intensities drop rapidly at higher temperatures. The aromatic amine antioxidant can decrease the attenuation of peak intensity, as it significantly reduces the rate constant of C=C thermal oxidation. The hindered phenolic antioxidant has a protective effect during the early stages of oxidation (induction period), but it may accelerate the oxidation of C=C afterwards.Originality/value Research on the structure changes of synthetic esters during oxidation by Raman spectroscopy will be of great importance in promoting the use of Raman spectroscopy to analyze the oxidation of lubricants.
VL  - 71
IS  - 5
SN  - 0036-8792
DO  - 10.1108/ILT-11-2018-0420
UR  - https://doi.org/10.1108/ILT-11-2018-0420
AU  - Cheng Bingxue
AU  - Duan Haitao
AU  - Jin Yongliang
AU  - Wei Lei
AU  - Dan Jia
AU  - Chen Song
AU  - Li Jian
PY  - 2019
Y1  - 2019/01/01
TI  - In situ Raman spectroscopy study on the effect of antioxidants on high temperature oxidation properties of TMPTO
T2  - Industrial Lubrication and Tribology
PB  - Emerald Publishing Limited
SP  - 706
EP  - 711
Y2  - 2024/05/10
ER  -