Abstract
Osteolysis which is triggered by inflammatory responses to PE wear particles in the artificial hip joints is a serious issue. In order to prolonging the service life of artificial joints and endow the low tribological properties of the bearing surface of ultra-high molecular weight polyethylene (UHMWPE), hydrophilic acrylamide (AM) was grafted onto the surface of UHMWPE powders with the method of ultraviolet irradiation (UV) and then the modified UHMWPE powders were hot pressed as the bulk materials. The tribological properties of modified UHMWPE were investigated under distilled water, saline, calf serum by sliding against stainless steel ball. The measurement of Fourier-transform infrared (FT-IR) spectroscopy, Energy different spectrometry (EDS) and X-ray photoelectron spectroscopy (XPS) indicate that AM was successfully grafted onto the surface of UHMWPE powders by UV irradiation. The contact angle of UHMWPE is 95° which is higher than that of modified UHMWPE and the wettability of UHMWPE-g-AM is effectively improved. The tensile strength of modified sample decreases. The friction coefficient of modified sample is lower than that of untreated UHMWPE in aqueous lubricants during a long-term friction. The modified UHMWPE with the diameter of 58–75 μm has the lowest friction coefficient in calf serum which is about 0.075. The wear tests of knee joint moving simulator show that the pure UHMWPE has the highest wear rate, about 8 × 10−7 mm3(N · m)−1 and the wear rate of grafted UHMWPE decreases gradually water with the decrease of powder diameter. The sample with the 58–75 μm powder diameter has the lowest wear rate which is about 4.8 × 10−7mm3(N · m)−1 . The tribological properties of UHMWPE grafted with AM has been improved and the grafting hydrophilic PAM polymer brushes are helpful to form a lubricating film of water, which leads to the improvement of the lubricity.
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The authors wish to express thanks to the financial support of National Natural Science Foundation of China (Grant No. 51575278, 11172142) and Innovation of graduate student training plan in Jiangsu province (Grant No. CXZZ13_0202).
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Deng, Y., Xiong, D. Fabrication and properties of UHMWPE grafted with acrylamide polymer brushes. J Polym Res 22, 195 (2015). https://doi.org/10.1007/s10965-015-0836-x
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DOI: https://doi.org/10.1007/s10965-015-0836-x