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The anti-oxidative properties of α-tocopherol in γ-irradiated UHMWPE with respect to fatigue and oxidation resistance

Paper ID Volume ID Publish Year Pages File Format Full-Text
12538 799 2005 8 PDF Available
Title
The anti-oxidative properties of α-tocopherol in γ-irradiated UHMWPE with respect to fatigue and oxidation resistance
Abstract

Although addition of an antioxidant (αα-tocopherol) is reported to prevent delamination in ultrahigh molecular weight polyethylene (UHMWPE) knee components, contribution of αα-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 γγ-irradiated (25 kGy), γγ-irradiated (25 kGy) with 0.3 wt% αα-tocopherol added, and γγ-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 γγ-irradiated UHMWPE specimens resulted in severe fatigue fractures. αα-Tocopherol-added UHMWPE specimens showed significantly lower projected area ratio of defects (1.80±0.82) than did γγ-irradiated (7.0±2.29) and tocopheryl acetate-added ones (8.50±2.01). The oxidation index of γγ-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 αα-tocopherol-added and tocopheryl acetate-added ones, respectively. The crystallinity of γγ-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 αα-tocopherol-added and tocopheryl acetate-added ones, respectively. The incorporation of αα-tocopherol significantly improves the long-term fatigue performance of γγ-irradiated UHMWPE with oxidation stability. Also, the addition of αα-tocopherol controls macromolecular structures resulting in the improvement of fatigue performance of UHMWPE.

Keywords
UHMWPE; γγ-irradiation; Oxidation; Delamination; Tocopherol; Crystallinity
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The anti-oxidative properties of α-tocopherol in γ-irradiated UHMWPE with respect to fatigue and oxidation resistance
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 26, Issue 29, October 2005, Pages 5755–5762
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us