Institute of Chemical Technology and Engineering, Poznań University of Technology, Berdychowo 4, 60-965, Poznan, Poland.
Institute of Materials Research and Quantum Engineering, Poznań University of Technology, Piotrowo 3, 60-965, Poznan, Poland.
Sci Rep. 2020 Nov 6;10(1):19289. doi: 10.1038/s41598-020-76360-3.
Commonly used endoprostheses in the orthopedic industry are those made of Ti6Al4V titanium alloy. Unfortunately, this material has low abrasion resistance, and therefore methods of their modification are still sought. A sensible approach is coating the alloy with a layer of a polymer having higher abrasion resistance. The adhesion of polymers to alloy is low, therefore the alloy requires prior modification. In this work, the alloy was modified with three types of diazonium salt and the influence of substituent on the effectiveness of modification was determined. Then, five or ten polyurethane layers were attached to the surface of the modified alloy. Using Raman mapping, the uniform distribution of layers was proved. Layers are stable in simulated human body fluids. The effectiveness of attaching subsequent layers of polyurethane was also confirmed by nanoindentation. The main focus of this work was to improve the wear resistance of the titanium alloy. The obtained results indicate that the titanium alloy with a polyurethane layer has almost ten times lower coefficient of friction compared to pure alloy. Such a low value has not been described in the literature so far. These results are the first step for obtaining endoprostheses with very high abrasion resistance.
骨科领域常用的内植物是由 Ti6Al4V 钛合金制成的。不幸的是，这种材料耐磨性低，因此仍在寻找其改性方法。一种明智的方法是在合金上涂覆一层具有更高耐磨性的聚合物层。聚合物与合金的附着力低，因此合金需要进行预处理。在这项工作中，用三种类型的重氮盐对合金进行了改性，并确定了取代基对改性效果的影响。然后，在经过改性的合金表面附着五或十层聚氨酯。使用拉曼映射，证明了层的均匀分布。层在模拟人体液中稳定。通过纳米压痕也证实了随后附着聚氨酯层的有效性。这项工作的主要重点是提高钛合金的耐磨性。所得结果表明，具有聚氨酯层的钛合金的摩擦系数比纯合金低近十倍。到目前为止，文献中尚未描述过如此低的值。这些结果是获得具有极高耐磨性的内植物的第一步。
