2007•Tribology TransactionsRequires access

Antioxidant Activity of 3,7-Di-iso-octyl-phenothiazine and Its Synergistic Effect with 4,4′-Di-iso-octyl-diphenylamine

Wang Hui, WU Zu-wang, Chaoliang Wei, Sun Dong, Fuli Wu

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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Key concepts: Diphenylamine, Phenothiazine, Chemistry, Antioxidant, Organic chemistry, Pharmacology, Medicine