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Biotribological properties of UHMWPE grafted with AA under lubrication as artificial joint

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Abstract

Osteolysis caused by wear particles from polyethylene in the artificial hip joints is a serious issue. In order to endow the low friction and wear of the bearing surface of ultra-high molecular weight polyethylene (UHMWPE) artificial joint for a longer term, hydrophilic acrylic acid (AA) was grafted on UHMWPE powders with the method of ultraviolet irradiation and then the modified powders were hot pressed. The tribological properties of modified UHMWPE sliding against CoCrMo metallic plate on reciprocating tribometer under calf serum, saline and distilled water lubrication during a long-term friction were investigated. The measurement of Fourier-transform infrared spectroscopy indicates that AA is successfully grafted on the surface of UHMWPE powders by photo-induced graft polymerization. Contact angles of UHMWPE are decreased from 83° to 35° by grafting and the surface wettability is effectively improved. The tensile strength of modified sample decreases. The friction coefficient and wear rate of UHMWPE-g-PAA under calf serum, saline and distilled water lubrication are lower than that of untreated UHMWPE. With the increase of grafting ratio, the wear rate of UHMWPE-g-PAA decreases firstly and then increases. The modified UHMWPE with grafting ratio of 3.5 % has the lowest wear rate, which is just quarter of the untreated UHMWPE. The hydrated PAA polymer brushes enclosed in the UHMWPE bulk material provide continuous lubrication during long term sliding.

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Acknowledgments

The authors wish to express thanks to the financial support of the National Natural Science Foundation of China (Grant No. 50975145, 11172142).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, Jiangsu, People’s Republic of China

    Yaling Deng, Dangsheng Xiong & Kun Wang

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  1. Yaling Deng
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  2. Dangsheng Xiong
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  3. Kun Wang
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Correspondence to Dangsheng Xiong.

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Deng, Y., Xiong, D. & Wang, K. Biotribological properties of UHMWPE grafted with AA under lubrication as artificial joint. J Mater Sci: Mater Med 24, 2085–2091 (2013). https://doi.org/10.1007/s10856-013-4970-x

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  • DOI: https://doi.org/10.1007/s10856-013-4970-x

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