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UHMWPE/GO nanocomposites for orthopaedic applications: thermal, mechanical and tribological characterization
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0002-5210-4341
Institute of Medical and Biological Engineering, University of Leeds.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.ORCID iD: 0000-0001-8676-8819
2014 (English)Conference paper, Oral presentation only (Refereed)
Abstract [en]

Metal-on-Polyethylene (MoP) is the bearing combination most commonly used in total joint replacements. However, the degradative oxidation behaviour of ultra high molecular weight polyethylene (UHMWPE) leads to high amounts of wear debris, which contributes to the development of aseptic loosening and eventually to the failure of the implant. In order to address this issue, investigations have focused on the development of novel materials with improved characteristics. Recently, Graphene oxide (GO) has generated great interest as reinforcement for polymer matrices due to its excellent mechanical properties. The aim of this study was to investigate the possibilities of UHMWPE/GO nanocomposites for their use in joint implants.UHMWPE/GO nanocomposites with different wt% GO content, up to 2 wt%, were manufactured under optimised conditions using a ball milling technique. Thermal, mechanical and structural characterizations of the UHMWPE/GO nanocomposites and conventional UHMWPE were carried out by means of Thermogravimetric Analysis (TGA), Differential Scanning Calorimetry (DSC), uniaxial tensile tests and High Resolution Scanning Electron Microscopy (HR-SEM). Contact angle measurements were carried out to investigate the wettability of the materials. In addition, the tribological performance of the novel nanocomposites will be assessed with a six-station multidirectional pin on plate wear simulator under hip kinematics.The results showed that GO has the ability to improve the performance of conventional UHMWPE. The incorporation of GO enhanced the thermal stability and oxidative resistance of conventional UHMWPE. Under optimised conditions, the mechanical properties and wettability of the nanocomposites were also improved. These findings suggest that UHMWPE/GO nanocomposites might be an interesting alternative to conventional UHMWPE for their use in orthopaedic aplications and more research concerning the biocompatibility and tribological performance of this material is currently under investigation.

Place, publisher, year, edition, pages
2014.
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear) Composite Science and Engineering
Research subject
Machine Elements; Polymeric Composite Materials
Identifiers
URN: urn:nbn:se:ltu:diva-39554Local ID: e5de82c9-24e2-4cfc-b26c-a9e433edbb1aOAI: oai:DiVA.org:ltu-39554DiVA, id: diva2:1013068
Conference
International Conference on BioTribology : 11/05/2014 - 14/05/2014
Note
Godkänd; 2014; 20141210 (emami)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2018-03-08Bibliographically approved

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Moreno, Silvia SuñerJoffe, RobertsEmami, Nazanin

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