人工关节用各向同性自增强聚乙烯共混物的制备与性能研究

项目名称： 人工关节用各向同性自增强聚乙烯共混物的制备与性能研究

项目编号： No.51273028

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 一般工业技术

项目作者： 何本祥

作者单位： 成都体育学院

项目金额： 80万元

中文摘要： 在不降低超高相对分子质量聚乙烯（UHMWPE）人工关节制品优异的耐磨性、抗蠕变性的前提下，提高其力学性能是目前该领域研究的重点，也是难点。本项目拟采用微交联UHMWPE 与低相对分子质量聚乙烯（LMWPE）共混，获得加工性能良好的UHMWPE/LMWPE共混物，并在注塑加工的保压阶段施加剪切流动场，在LMWPE中形成shish-kebab取向自增强结构，然后采用固态成型在充分保留自增强结构的同时使其在各个方向上结构分布均匀，使制品在各个方向上的综合力学性能得到显著同步增强。通过系统研究微交联UHMWPE /LMWPE体系流变性能，加工流动场下UHMWPE/LMWPE共混物自增强结构的调控，固态成型制品的性能，揭示UHMWPE/LMWPE共混物自增强材料加工外场-形态结构-性能间的关系，为制备高性能人工关节植入体提供理论指导与技术支持。

中文关键词： 超高分子量聚乙烯；人工关节；注塑成型；力学性能；骨替代

英文摘要： Improving mechanical properties of UHMWPE implants without the sacrifice of the excellent wear and fatigue resistance of UHMWPE has been the focus of current research in this area. In this work, crosslinked UHMWPE is proposed to blend with LMWPE aiming to obtain PE blend with desirable fluidity, and then UHMWPE/LMWPE blend is processed under oscillation shear stress field to form the oriented shish-kebab self-reinforced superstructure in LMWPE phase, finally cold compressing is employed with the intention of fully retaining the self-reinforced superstructure and making it evenly distribute in all direction, aiming to achieve suitable artificial joint specimens with homogenized superior comprehensive performance in each direction. Through systematic study of the rheological properties of UHMWPE/LMWPE blend, modulation of the self-reinforced superstructure of UHMWPE/LMWPE blend under flow field as well as the properties of product by cold compressing, we can reveal the relationship between processing field - morphology and structure - performance of UHMWPE/LMWPE self-reinforced material, providing theoretical guidance and technical support for the preparation of high-performance artificial joint implants.

英文关键词： Ultrahigh molecular weight polyethylene (UHMWPE)；Artificial joint；Injection molding；Mechanical properties；Bone replacement