Mixed tocopherols were evaluated for antioxidant performance in polypropylene and polyethylene in combination with a phosphite secondary antioxidant by utilizing a two‐factor central composite experimental design with oxidation induction time as the response. A commonly used phenolic antioxidant and synthetic vitamin E (α‐tocopherol) were evaluated in comparison. Mixed tocopherols were found to have a greater antioxidant effect than the phenolic control and a similar to slightly greater effect than vitamin E in both polypropylene and polyethylene. No significant effects of the phosphite on oxidation induction times were observed for either of the tocopherol‐based antioxidants. J. Vinyl Addit. Technol. 10:52–56, 2004.
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Suffield et al. (2004) studied this question.
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