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Journal of Nanotechnology
Volume 2012 (2012), Article ID 729756, 7 pages
http://dx.doi.org/10.1155/2012/729756
Research Article

Wear-Resistant Ultrahigh-Molecular-Weight Polyethylene-Based Nano- and Microcomposites for Implants

1Institute of Strength Physics and Materials Science SB RAS, Laboratory of Composite Polymeric Materials, pr. Akademicheskii, 2/4, Tomsk 634021, Russia
2National Research Tomsk Polytechnic University, Institute of Physics of High Technologies, Lenin Avenue, 30, Tomsk 634050, Russia
3Institute of Solid State Chemistry and Mechanochemistry SB RAS, Laboratory of Intercalation and Mechanochemical Reactions, Kutateladze 18, Novosibirsk 630128, Russia
4V.A. Belyi Metal-Polymer Research Institute NASB, Department of Mechanics of Adaptive Materials and Biomechanics, 32A Kirov Street, 246050 Gomel, Belarus

Received 10 April 2012; Accepted 18 May 2012

Academic Editor: Guifu Zou

Copyright © 2012 S. V. Panin et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The influence of modification by hydroxyapatite (HA) nano- and microparticles on tribotechnical properties of ultrahigh-molecular-weight polyethylene (UHMWPE) was investigated to develop polymer implants for endoprosthesis. It was shown that modification of UHMWPE by hydroxyapatite nanoparticles within range of 0.1–0.5 wt.% results in increase of wear resistance at dry sliding by 3 times. On the other hand adding of 20 wt.% of micron size HA gives rise to the same effect. The effect of increasing wear resistance is not substantially changed at surface treatment of the nano- and microcomposites by N+ ion beams as compared with nonirradiated blends. Preliminary joint mechanical activation of UHMWPE powder and fillers results in more uniform distribution of nanofillers in the matrix and, as a result, formation of more ordered structure. Structure within bulk material and surface layers was studied by means of optical profilometry, scanning electron microscopy, infrared spectroscopy, and differential scanning calorimetry. It is shown that adding of hydroxyapatite nanoparticles and high-energy surface treatment of the composite by N+ ion implantation improve tribotechnical properties of UHMWPE due to formation of chemical bonds in the composite (crosslinking) and ordering of permolecular structure.