Measurement of the diffusion coefficient of oxygen in gamma sterilized UHMWPE using free radical techniques


The oxygen diffusion in gamma sterilized ultra high molecular weight polyethylene (UHMWPE) using free radical techniques was investigated. One set of samples was gamma irradiated and kept in air at 23°C, while another set of samples was gamma irradiated in an inert environment, annealed at 75°C and subsequently opened to air at 23°C. An X-band electron spin resonance (ESR) spectrometer was used for the detection of free radicals. It was observed that diffusion coefficients for annealed samples were more than an order of magnitude smaller than those for the un-annealed samples.

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Transactions - 7th World Biomaterials Congress

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