The Anchoring Effect of the Fine, Powdery Copolymer of Glycidyl Methacrylate-Divinyl Benzene for Antioxidants in Polypropylene

Abstract

The anchoring effect of the fine, powdery copolymer of glycidyl methacrylate-divinylbenzene, blended in polypropylene, for phenolic antioxidants was studied by the oxygen absorption method and by studying the infrared spectrum. As a result, the anchoring effect was recognized, and it was confirmed that the effect came from the reaction between the phenolic hydroxyl groups of antioxidants and the epoxy groups of the fine, powdery copolymer and that, furthermore, the anchoring effect was related to the molecular structure of the antioxidants. It is interesting to note that these results suggests that polymeric antioxidants practically overcome the defect of the migration or the volatility observed on low-molecular-weight antioxidants.