ANTIOXIDANT PERFORMANCE OF MIXED TOCOPHEROLS IN STYRENIC BLOCK COPOLYMERS

摘要

Mixed tocopherols containing a predominance of γ-tocopherol were evaluated for antioxidant performance in polybutadiene and polyisoprene based styrenic block copolymers using oxidative induction time as a measure of antioxidant performance. A conventional hindered phenolic antioxidant and α-tocopherol (vitamin E) were evaluated in comparison. Mixed tocopherols exhibited significantly higher performance than the controls in both SIS and SBS polymers.