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Effect of rosemary extract on the radiation stability of UHMWPE

Abstract This paper presents the assay on the radiochemical degradation of UHMWPE films containing rosemary. Three concentrations of natural polyphenolic extract were selected: 0, 0.25 and 0.50 % (w/w). FTIR and UV-VIS spectra were recorded and the variation in the characteristic bands was followed. The accumulation of carbonyl and hydroperoxyl structures was attempted for all samples including neat specimen. The contribution of additive to the protection of UHMWPE against oxidative degradation is discussed in relation with polyphenol concentration and irradiation dose. The spectral information is correlated with the results of chemiluminescence investigation. The increase in the additive concentration brings about significant longer induction times that are determined by the slower accumulation of primary intermediates, hydroperoxides. The antioxidant efficiency of rosemary extract is also revealed by the variation in carbonyl and hydroxyl indexes.