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Tribological properties and biocompatibility of UHMWPE grafted with MPC brushes
Xiong Dangsheng 1 *,Yang Yuanyuan 2 #
1.School of Materials Science and Engineering, Nanjing University of Science and Technology
2.School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094
*Correspondence author
#Submitted by
Subject:
Funding: the Natural Science Foundation of China（No.No. 50975145）
Opened online: 8 July 2011
Accepted by: none
Citation: Xiong Dangsheng,Yang Yuanyuan.Tribological properties and biocompatibility of UHMWPE grafted with MPC brushes[OL]. [ 8 July 2011] http://en.paper.edu.cn/en_releasepaper/content/4434407
 
 
Extremely efficient lubrication was observed between natural joint surfaces and the friction coefficients can reach as low as 0.001. To date, the ultra-low friction coefficients between articulating cartilage surfaces can not be attained in any artificial joints. On the purpose of attaining the ultra-low friction coefficients as natural joints, a biomimetic zwitterionic monomer 2-methacryloyloxyethyl phosphorylcholine (MPC) were grafted on to ultrahigh molecular weight polyethylene(UHMWPE) by UV radiation and polymerized to form brush-like structure. The results of total reflection (FT-IR/ATR) spectra and X-ray photoelectron spectroscopy (XPS) spectra indicated that PMPC(Polymerization of 2-methacryloyloxyethyl phosphorylcholine) brushes were successfully attached to the UHMWPE surface. The water contact angle of UHMWPE decreases from 76 to 15 after grafting PMPC. Tribological properties were tested under physiological stress. The initiative friction coefficient of the sample grafted with PMPC is much lower than that of untreated UHMWPE and the wear rate of modified samples was decreased by 37% and 46% in distilled water and saline respectively, although the PMPC brushes may be sheared off during a long-term friction. The highly hydrated PMPC layer provided efficient lubrication at the interface between the sliding couple leading to wear reduction of UHMWPE. Furthermore, blood compatibility of modified artificial joint materials was improved significantly, which was also attributed to the properties and structures of PMPC grafted on the UHMWPE surface.
Keywords:artificial joint;UHMWPE;polymer brushes;friction and wear;blood compatibility
 
 
 

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