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Abstract
The antioxidant activity of 3,7-di-iso-octyl-phenothiazine and 4,4′-di-iso-octyl-diphenylamine as well as their mixtures in PAO 166 were studied. The results showed that 3,7-di-iso-octyl-phenothiazine performed much better than its starting material 4,4′-di-iso-octyl-diphenylamine in terms of controlling the increases of viscosity and the acid number. 3,7-Di-iso-octyl-phenothiazine showed good performance even at trace concentrations. It seems that the decomposed products would likely have significant antioxidant activity. The synergistic effect of the mixtures consisting of 3,7-di-iso-octyl-phenothiazine and 4,4′-di-iso-octyl-diphenylamine was also studied.
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Acknowledgments
Presented at the STLE Annual Meeting in Calgary, Alberta, Canada May 7–11, 2006
Review led by Lois Gschwender