HA/UHMWPE纳米复合材料的加工与力学性能

Processing and mechanical properties of HA/UHMWPE nanocomposites.

作者信息

Fang Liming, Leng Yang, Gao Ping

机构信息

Department of Mechanical Engineering, The Hong Kong University of Science and Technology, Hong Kong, PR China.

出版信息

Biomaterials. 2006 Jul;27(20):3701-7. doi: 10.1016/j.biomaterials.2006.02.023. Epub 2006 Mar 27.

DOI:10.1016/j.biomaterials.2006.02.023

PMID:16564570

Abstract

A hydroxyapatite (HA) particulate reinforced ultrahigh molecular weight polyethylene (UHMWPE) nanocomposite was fabricated by compounding HA and UHMWPE mixtures in paraffin oil using twin-screw extrusion and then compression molding. Scanning electron microscope images revealed that HA aggregates were broken down to nano-sized particles and homogeneously dispersed in UHMWPE by the combined processes of twin-screw extrusion and UHMWPE swelling treatment. Transmission electron microscope images indicated the HA particles and UHMWPE matrix were intimately contacted through mechanical interlocking. The composite with the HA volume fraction of 0.23 exhibited a Young's modulus nine times higher than that of UHMWPE, while the composite maintained the excellent toughness feature of UHMWPE. The fracture strain reached over 300%, significantly higher than other types of biocomposites.

摘要

通过在石蜡油中使用双螺杆挤出法将羟基磷灰石（HA）和超高分子量聚乙烯（UHMWPE）混合物进行复合，然后压缩成型，制备了一种HA颗粒增强的UHMWPE纳米复合材料。扫描电子显微镜图像显示，通过双螺杆挤出和UHMWPE溶胀处理的联合工艺，HA聚集体被分解为纳米级颗粒并均匀分散在UHMWPE中。透射电子显微镜图像表明，HA颗粒与UHMWPE基体通过机械联锁紧密接触。HA体积分数为0.23的复合材料的杨氏模量比UHMWPE高九倍，同时该复合材料保持了UHMWPE优异的韧性特征。断裂应变超过300%，明显高于其他类型的生物复合材料。