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羟基磷灰石/液晶复合材料仿生人工骨的制备及性能

, PP. 100-105

Keywords: 复合材料,液晶高分子,羟基磷灰石,螺杆挤出,力学性能

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Abstract:

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/VectraA950)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VectraA950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VectraA950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VectraA950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VectraA950的界面进行改性以提高其结合性能。

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