Comparison of free-radical-induced oxidation of highly crosslinked and conventional UHMWPE


The comparison between free radical mediated oxidation of crosslinked ultrahigh molecular weight polyethylene (UHMWPE) (XLPE) and conventional UHMWPE was described. UHMWPE resin GUR 1050 was crosslinked with an electron beam and was heated to about 140°C to quench residual free radicals. Rectangular samples were prepared for free radical measurement and 100-175-μm thick films for oxidation index (OI) by fourier transform infrared spectroscopy (FTIR) and crystallinity by differential scanning calorimetry (DSC). The single line detected at 150 days was found to be due to oxygen-induced radical (OIR), which starts to show in the ESR spectrum at about 29 days of aging.

Publication Title

Transactions - 7th World Biomaterials Congress

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