Deng Yaling, Xiong Dangsheng, Wang Kun
School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu 210094, PR China.
School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu 210094, PR China.
J Mech Behav Biomed Mater. 2014 Jul;35:18-26. doi: 10.1016/j.jmbbm.2014.03.009. Epub 2014 Mar 27.
Ultra-high molecular weight polyethylene (UHMWPE) powder was modified with a zwitterion monomer with good biocompatibility of MPDSAH (3-dimethy (3-(N-methacryamido) propyl) ammonium propane sulfonate) by UV irradiation and then hot pressed. The microstructure and mechanical properties of modified UHMWPE are investigated. The results show that the structure of powder and bulk materials has been changed. The modified powders have more filaments than that of untreated. The surface of modified bulk materials is more rough and displays the granular protuberances which have the random loose arrangement compared with untreated UHMWPE. The crystallinity, uniaxial tensile and compressive properties decreased after grafting. Ultimate elongations decrease with the increase of the monomer concentration and are higher than 300% which is recommended by ASTM and ISO except the sample with 0.45mol/L MPDSAH. The friction coefficient of modified UHMWPE is lower than that of the untreated UHMWPE and it decreases gradually with the increase of monomer concentration. The wear rates have been decreased and the wear resistance has been improved under saline and distilled water lubrication.
采用紫外线辐照，并用具有良好生物相容性的两性离子单体3-（N-甲基丙烯酰胺基）丙基二甲基丙磺酸盐（MPDSAH）对超高分子量聚乙烯（UHMWPE）粉末进行改性，然后进行热压。研究了改性UHMWPE的微观结构和力学性能。结果表明，粉末和块状材料的结构发生了变化。改性粉末比未处理的粉末有更多的长丝。与未处理的UHMWPE相比，改性块状材料的表面更粗糙，呈现出随机松散排列的颗粒状凸起。接枝后结晶度、单轴拉伸和压缩性能下降。极限伸长率随单体浓度的增加而降低，除含0.45mol/L MPDSAH的样品外，均高于美国材料与试验协会（ASTM）和国际标准化组织（ISO）推荐的300%。改性UHMWPE的摩擦系数低于未处理的UHMWPE，且随单体浓度的增加而逐渐降低。在盐水和蒸馏水润滑条件下，磨损率降低，耐磨性提高。
