HAP/UHMWPE对称分布复合功能生物材料的研究

Researches on HAP/UHMWPE symmetrical functionally biomaterial

通过自制模具获得羟基磷灰石(HAP)/超高分子量聚乙烯(UHMWPE)复合功能材料,在此基础上通过层叠法获得5层HAP含量不同的对称分布的功能材料,HAP含量(体积分数)按40%→20%→0%→20%→40%呈对称分布。通过SEM、X射线、DSC以及力学测试,分析了复合材料的微观结构和力学性能。在此基础上通过SEM-EDX分析了5层对称分布复合材料的微观结构和元素含量。结果表明,随着HAP加入量的增加,复合材料的拉伸强度和抗弯强度均下降,而弹性模量随体积比增加而增加。UH-MWPE通过其超长分子链获得网状结构,起着骨架作用,而HAP被包裹在UHMWPE超长细链形成的层层网状结构之中,HAP和UHMWPE之间只是机械混合在一起。5层HAP/UHMWPE复合材料的层与层之间界面清晰但紧密连接在一起,而HAP含量在界面并没有形成梯度变化。

Hydroxyapatite （HAP）/ultra high molecular weight polyethylene （UHMWPE） functionally biomaterials were successfully fabricated using self-made mould, and 5 symmetrical functionally layered HAP/UHMWPE biomaterial was prepared through method of superposition, whereas stepwise change of volume fraction of HAP according to 40 %→20 %→0 %→20 %→40 % can be corresponded in the layered biomaterial. Microstructure characteristics and mechanical properties of HAP/UHMWPE biomaterials were studied by SEM observation, X-ray analyses, DSC analyses, tensile, bending strength and elastic modulus measurement. It is found that with the increase of volume fraction of HAP, the tensile and bending strength of the material all decreased, but the elastic modulus of the material increased. UHMWPE afforded the mechanical strength of the material through mesh structures formed by its super long molecular chain, HAP particles were wrapped in the layer mesh structure formed by UHMWPE, HAP and UHMWPE were simply mixed with each other. Interfaces among layers were distinct in HAP/UHMWPE symmetrical layered material but tightly connected with each other, HAP particles on the interfaces among layers were not gradient.