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The effect of molecular composition on the oxidative behaviour of group I base oils in the presence of an antioxidant additive
Author(s) -
Adhvary A.,
Erhan Sevim Z.,
Singh I. D.
Publication year - 2002
Publication title -
lubrication science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.632
H-Index - 36
eISSN - 1557-6833
pISSN - 0954-0075
DOI - 10.1002/ls.3010140202
Subject(s) - base oil , chemistry , antioxidant , hydrocarbon , base (topology) , lubricant , molecule , composition (language) , organic chemistry , fourier transform infrared spectroscopy , chemical engineering , materials science , composite material , scanning electron microscope , mathematical analysis , linguistics , philosophy , mathematics , engineering
The response of base oil hydrocarbons to additive molecules is fundamental to any lubricant formulation. To have this understanding it is important to have complete knowledge of the base oil hydrocarbon composition. The work reported here is a study of a series of API Group I base oils showing the effect of various structural parameters during oxidation with an antioxidant additive (zinc dialkyldithiophosphate, ZDDP). To understand this complex base oil‐additive interaction pattern, a combination of chromatographic and spectroscopic methods has been adopted. The results show that certain NMR ‐derived base oil structural parameters can be used as an index of the additive response in conjunction with column chromatographic and FTIR absorption data. It is also observed that saturated molecules, i.e., iso‐ and normal paraffins and naphthenes, behave differently towards an antioxidant additive, and the total additive response is the result of all the interactions in the system.