摘要
通过优化的加工条件制备了羟基磷灰石/热致液晶高分子(HA/Vectra A950)复合材料仿生人工骨,研究了HA含量对复合材料显微结构和力学性能的影响,分析了HA与Vectra A950共混后的力学性能以及界面结合问题。研究结果表明:当HA与Vectra A950的质量比小于10∶100时,复合材料呈现明显的皮芯结构,皮层液晶微纤高度取向,HA主要分散在芯部,其模量和强度达到或超过天然骨的力学性能;随着HA含量的增加,皮芯结构逐步减弱并消失,而缺陷显著增加。当HA与Vectra A950的质量比增加到20∶100,复合材料的力学性能、尤其是韧性显著降低,这可能是由于HA颗粒与液晶基体之间的结合较差导致的。为保证复合材料仿生人工骨的生物活性,HA的含量应与天然骨接近。因此,需对HA和Vectra A950的界面进行改性以提高其结合性能。
Hydroxyapatite/thermotropic liquid crystal polymer（HA/Vectra A950） composites were processed with optimized parameters.When the HA/Vectra A950 mass ratio is less than 10/100,the composite exhibits a core-shell structure.The HA particles are mainly dispersed in the core part,while the skin layer is composed of highly oriented Vectra A950 microfibrils.The tensile modulus and strength of the composite are comparable or even higher than those of natural bone.With the increase of HA content,the core-shell structure disappears gradually,but the defects increase.With the increase of HA/Vectra A950 mass ratio to 20/100,the composite mechanical properties,fracture strain in particular,significantly decrease.This is attributed to the interface adhesion between HA particles and Vectra A950 matrix is poor.To ensure the bioactivity,HA content of the bone mimicking composite needs to be close to that of natural bone.Therefore,the interface of HA/Vectra A950 needs to be modified to improve their adhesion.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2011年第5期100-105,共6页
Acta Materiae Compositae Sinica
基金
国家自然科学基金重点项目(50830101)
国家自然科学基金面上项目(51072055)
教育部高校博士点基金项目(200805611030)
广东高校优秀青年创新人才培育项目(N909024a)
关键词
复合材料
液晶高分子
羟基磷灰石
螺杆挤出
力学性能
composite
liquid crystal polymer
hydroxyapatite
screw extrusion
mechanical property
作者简介
通讯作者：方立明，博士，讲师，主要从事生物医学材料研究 Email：lmfang@scut．edu．cn
