Improved resistance to wear and fatigue fracture in high pressure crystallized vitamin E-containing ultra-high molecular weight polyethylene |
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| Authors: | Ebru Oral Christine A. Godleski Beckos Andrew J. Lozynsky Arnaz S. Malhi Orhun K. Muratoglu |
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| Affiliation: | 1. Massachusetts General Hospital, Department of Orthopaedic Surgery, Boston, MA 02114, USA;2. Harvard Medical School, Boston, MA, USA;1. Microsoft, One Microsoft Way, Redmond, WA 98052, United States;2. Mechanical and Aerospace Engineering Department, Case Western Reserve University, Cleveland, OH 44106, United States;1. Department of Materials Science and Technology, Instituto de Investigación en Ingeniería de Aragón, I3A, Universidad de Zaragoza, 50018 Zaragoza, Spain;2. Implant Research Center, School of Biomedical Engineering, Science and Health Systems, Drexel University, Philadelphia, PA 19104, USA;3. Exponent, Inc., Philadelphia, PA 19104, USA;1. Division of Machine Elements, Luleå University of Technology, Luleå SE-971 87, Sweden;2. Institute of Medical and Biological Engineering, Leeds, UK;1. Faculty of Printing, Packaging Engineering and Digital Media Technology, Xi’an University of Technology, Xi’an, Shaanxi 710048, People’s Republic of China;2. Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang’an University, Xi’an 710064, Shaanxi, People’s Republic of China;3. State Key Laboratory of Polymer Materials Engineering, College of Polymer Science and Engineering, Sichuan University, Chengdu, Sichuan 610065, People’ Republic of China |
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| Abstract: | Higher crystallinity and extended chain morphology are induced in ultra-high molecular weight polyethylene (UHMWPE) in the hexagonal phase at temperatures and pressures above the triple point, resulting in improved mechanical properties. In this study, we report the effects of the presence of a plasticizing agent, namely vitamin E (α-tocopherol), in UHMWPE during high pressure crystallization. We found that this new vitamin E-blended and high pressure crystallized UHMWPE (VEHPE) has improved fatigue strength and wear resistance compared to virgin high pressure crystallized (HP) UHMWPE. This suggested different mechanisms of wear reduction and fatigue crack propagation resistance in UHMWPE. |
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