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- W2087597005 abstract "Engine oils undergo oxidative degradation and wears out during service. Hence it is important to characterize ageing of engine oils at different simulated conditions to evaluate the performance of existing oils and also design new formulations. This work focuses on characterizing the thermo-oxidative degradation of synthetic and semi-synthetic engine oils aged at 120, 149 and 200 °C. Apparent activation energy of decomposition of aged oils evaluated using the isoconversional Kissinger-Akahira-Sunose technique was used as a thermal stability marker. The temporal variation of stability at different ageing temperatures was corroborated with kinematic viscosity, oxidation, sulfation and nitration indices, total base number, antiwear additive content and molecular structure of the organic species present in the oils. At the lowest temperature employed, synthetic oil underwent higher rate of oxidation, while semi-synthetic oil was stable for longer time periods. At higher temperatures, the initial rate of change of average apparent activation energy of synthetic oil correlated well with a similar variation in oxidation number. A mixture of long chain linear, branched, and cyclic hydrocarbons were observed when semi-synthetic oil was degraded at higher temperatures." @default.
- W2087597005 created "2016-06-24" @default.
- W2087597005 creator A5032721517 @default.
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- W2087597005 date "2015-03-17" @default.
- W2087597005 modified "2023-10-17" @default.
- W2087597005 title "Characterization of Thermal Stability of Synthetic and Semi-Synthetic Engine Oils" @default.
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- W2087597005 doi "https://doi.org/10.3390/lubricants3010054" @default.
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