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• W2036133042 abstract "Although addition of an antioxidant (α-tocopherol) is reported to prevent delamination in ultrahigh molecular weight polyethylene (UHMWPE) knee components, contribution of α-tocopherol as an antioxidant to the improvement of long-term fatigue performance of UHMWPE is an unknown mechanism. To solve this problem, bi-directional sliding fatigue tests were performed for γ-irradiated (25 kGy), γ-irradiated (25 kGy) with 0.3 wt% α-tocopherol added, and γ-irradiated (25 kGy) with 0.3 wt% tocopheryl acetate added UHMWPE specimens. Internal defect initiation was quantified with scanning acoustic tomography (SAT). Also, oxidation index and crystallinity were obtained from infrared absorption spectra measured using Fourier transform infrared (FT-IR) microscopy. Only γ-irradiated UHMWPE specimens resulted in severe fatigue fractures. α-Tocopherol-added UHMWPE specimens showed significantly lower projected area ratio of defects (1.80±0.82) than did γ-irradiated (7.0±2.29) and tocopheryl acetate-added ones (8.50±2.01). The oxidation index of γ-irradiated UHMWPE specimens (0.111±0.0052) was extremely higher compared to those of doped ones; 0.0179±0.0026 and 0.0144±0.0069 for α-tocopherol-added and tocopheryl acetate-added ones, respectively. The crystallinity of γ-irradiated UHMWPE specimens (57.5±1.16) was lower compared to those of doped ones; 60.3±0.72 and 60.4±1.38 for α-tocopherol-added and tocopheryl acetate-added ones, respectively. The incorporation of α-tocopherol significantly improves the long-term fatigue performance of γ-irradiated UHMWPE with oxidation stability. Also, the addition of α-tocopherol controls macromolecular structures resulting in the improvement of fatigue performance of UHMWPE." @default.
• W2036133042 created "2016-06-24" @default.
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• W2036133042 date "2005-10-01" @default.
• W2036133042 modified "2023-09-27" @default.
• W2036133042 title "The anti-oxidative properties of α-tocopherol in γ-irradiated UHMWPE with respect to fatigue and oxidation resistance" @default.
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• W2036133042 doi "https://doi.org/10.1016/j.biomaterials.2005.02.035" @default.
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