摘要超高分子量聚乙烯(UHMWPE)以其优异的综合机械性能和生物相容性，在人工关节替代材料的应用中得到广泛重视。但是随着置换关节使用年限的增长，磨损产生的磨屑会引起人体内不良的生物反应，造成人工关节松动失效。本实验模拟天然关节软骨的多孔结构、刷状结构和润滑状态，在多孔超高分子量聚乙烯表面接枝生物相容性良好的丙烯酰胺(AM)，对平面、多孔、多孔接枝的样品的相关性能分别进行了测试和评价。结果表明：紫外光成功引发AM在平面样品和多孔样品表面进行接枝聚合反应；多孔样品的接触角高于平面样品，亲水性降低，多孔接枝样品的接触角最低，亲水性增强，表明材料的润湿性得到有效改善；在生理盐水润滑条件下，多孔材料的摩擦系数明显低于平面材料的摩擦系数，接枝后材料的摩擦系数明显低于未接枝样品，并且接枝后的多孔材料的摩擦系数最低，摩擦性能得到提高。67779

毕业论文关键词 超高分子量聚乙烯  多孔  接枝  摩擦性能

毕业设计说明书（论文）外文摘要

Title The study of tribological performance of porous structure Of Ultra-high molecular weight polyethylene

Abstract

Ultra-high molecular weight polyethylene (UHMWPE) has been widely used in the application of artificial joint replacement materials, with its excellent comprehensive mechanical properties and biocompatibility. But with the growth of durable years, the replacement joints will cause bad biological response in the human body, which will cause artificial joint becoming flexible and loosening. This study is to mimic the characteristics of natural cartilage which is porous structure, brush and lubrication to modify the artificial joint. Acrylamide (AM) with good biocompatibility is grafted on the surface of porous ultra-high molecular weight polyethylene, and then the related properties were investigated. It shown that AM is successfully grafted on the surface of porous UHMWPE by photo-induced graft polymerization. Contact angle of porous samples is higher than that of flat samples, and wettability of porous samples decrease. The porous sample with grafted AM has the lowest contact angle and the wettability has been enhanced. It suggests that the wettability of the material has been improved effectively. 

In the lubricant condition of saline, the friction coefficient of porous samples is lower than that of plane samples markedly. The friction coefficient of grafted material is lower than that of samples without grafting, and porous materials with grafted AM has the lowest friction coefficient. The triobological properties have been improved.

Keywords UHMWPE, Porous, Grafted, triobological properties

目  次

1 绪论 1

1.1引言 1

1.2 超高分子量聚乙烯制孔技术 1

1.3 UHMWPE的改性 4

1.4 表面织构技术改善摩擦副表面摩擦学性能的机理 9

1.5本文主要研究内容和意义 10

2实验部分 12

2.1实验方法： 12

2.2实验原材料及设备 12

2.3实验具体步骤 13

3实验性能测试 15

3.1红外吸收光谱测试 15

3.2扫描电镜(SEM) 16

3.3润湿角测试 16

3.4摩擦性能测试