Date of Award
Master of Science
Muhammad Shah Jahan
Many medical device applications have begun to incorporate an antioxidant, Vitamin E at low concentrations (0.1 – 0.3 Wt%) within Ultra-High Molecular Weight Polyethylene (UHMWPE) components of total joint replacement. The lowest detectable limit, currently, of vitamin-E within these UHMWPE components, is around 0.3 Wt%, while the most common concentration of vitamin-E in vitamin-E-blended UHMWPE components is 0.1 Wt%. With these components, therefore, science is currently limited to mostly observations of subsequent wear rates of the resulting UHMWPE product and assumptions regarding the effects of vitamin E. To fill this gap, this study has custom-blended a variety of UHMWPE with higher concentrations of vitamin-E (up to 15.0Wt%) to allow for the direct observation of vitamin E and its antioxidant role within UHMWPE. The samples were treated with ionizing radiation (the subjects of study) as is typically done in the manufacturing process and compared to non-irradiated controls, via Fourier Transform Infra-Red (FTIR) analysis and UV-Vis (Ultra-Violet-Visible spectrum) spectrophotometry, which no study has done before. While such higher concentrations of vitamin-E are not typically used in UHMWPE components of medical devices, they can allow better evaluation of vitamin-E directly, regarding its role in protection from oxidation and resulting degradation. Results suggest anti-oxidant effects at low concentrations of Vitamin-E as expected, but also possible “pro-oxidant” effects of Vitamin E at higher concentrations, and this study provides information which will help medical device manufacturers to improve the successful life of polyethylene components, as well as the community in general to understand the effects of vitamin-E in polyethylene.
Dissertation or thesis originally submitted to the local University of Memphis Electronic Theses & dissertation (ETD) Repository.
Staggers, Trae Lawrence, "Ftir and UV-Vis Spectroscopic Investigation of Medical Grade Ultra-High Molecular Weight Polyethylene Blended with the Antioxidant Vitamin-E, Following Simulated Gamma-Sterilization and Shelf-Aged for 10 Years" (2020). Electronic Theses and Dissertations. 2120.