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Polymers 2016, 8(8), 295; doi:10.3390/polym8080295

Effect of Argon Plasma Treatment on Tribological Properties of UHMWPE/MWCNT Nanocomposites

1
Plasma Research Laboratory, Department of Physics, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia
2
Department of Physics, Federal Urdu University of Arts, Science & Technology, 45320 Islamabad, Pakistan
3
Department of Mechanical Engineering, National Institute of Science and Technology, 761008 Berhampur, India
*
Authors to whom correspondence should be addressed.
Academic Editor: Frank Wiesbrock
Received: 13 June 2016 / Revised: 25 June 2016 / Accepted: 30 June 2016 / Published: 11 August 2016
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Abstract

Ultra-high molecular weight polyethylene (UHMWPE) is widely used in artificial joints in the replacement of knee, hip and shoulder that has been impaired as a result of arthritis or other degenerative joint diseases. The UHMWPE made plastic cup is placed in the joint socket in contact with a metal or ceramic ball affixed to a metal stem. Effective reinforcement of multi-walled carbon nanotubes (MWCNTs) in UHMWPE results in improved mechanical and tribological properties. The hydrophobic nature of the nanocomposites surface results in lesser contact with biological fluids during the physiological interaction. In this project, we investigate the UHMWPE/MWCNTs nanocomposites reinforced with MWCNTs at different concentrations. The samples were treated with cold argon plasma at different exposure times. The water contact angles for 60 min plasma-treated nanocomposites with 0.0, 0.5, 1.0, 1.5, and 2.0 wt % MWCNTs were found to be 55.65°, 52.51°, 48.01°, 43.72°, and 37.18° respectively. Increasing the treatment time of nanocomposites has shown transformation from a hydrophobic to a hydrophilic nature due to carboxyl groups being bonded on the surface for treated nanocomposites. Wear analysis was performed under dry, and also under biological lubrication, conditions of all treated samples. The wear factor of untreated pure UHMWPE sample was reduced by 68% and 80%, under dry and lubricated conditions, respectively, as compared to 2 wt % 60 min-treated sample. The kinetic friction co-efficient was also noted under both conditions. The hardness of nanocomposites increased with both MWCNTs loading and plasma treatment time. Similarly, the surface roughness of the nanocomposites was reduced. View Full-Text
Keywords: UHMWPE/MWCNTs nanocomposites; UHMWPE; biomaterials; dielectric barrier discharge (DBD); surface modification; wear resistance UHMWPE/MWCNTs nanocomposites; UHMWPE; biomaterials; dielectric barrier discharge (DBD); surface modification; wear resistance
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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. (CC BY 4.0).

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MDPI and ACS Style

Naresh Kumar, N.; Yap, S.L.; bt Samsudin, F.N.D.; Khan, M.Z.; Pattela Srinivasa, R.S. Effect of Argon Plasma Treatment on Tribological Properties of UHMWPE/MWCNT Nanocomposites. Polymers 2016, 8, 295.

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