Abstract
Three monomeric antioxidants bearing the same antioxidant moiety but different polymerizable groups, i.e. 3,5-di- tert-butyl-4-hydroxy-benzyl methacrylate, trans-3,5-di- tert-butyl-4-hydroxycinnamic acid and 3,5-di- tert-butyl-4-hydroxystyrene have been grafted on to low molecular weight polyethylene and high density polyethylene. The polyethylene-bound antioxidants have been obtained by a synthetic procedure capable of industrial applications, i.e. the melt grafting of polyethylene with monomeric antioxidants at 130–170°C in the presence of free radical initiators. Although the melt grafting of the monomeric antioxidants on to polyethylene was usually able to assure only 40–60% antioxidant binding, the compatibility of the unreacted monomeric antioxidants with the host polymer was improved by the presence of the grafted ones. The antioxidant moieties chemically linked to the polyethylene chains preserved their antioxidant action.
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