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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。
The bionic artificial bone of hydroxyapatite / thermotropic liquid crystal polymer (HA / Vectra A950) composite was prepared by optimizing the processing conditions. The effect of HA content on the microstructure and mechanical properties of the composite was studied. The effect of HA and Vectra A950 after blending the mechanical properties and interface bonding problems. The results show that when the weight ratio of HA to Vectra A950 is less than 10: 100, the composite exhibits a clear skin-core structure. The cortical liquid crystalline microfibers are highly oriented. HA mainly disperses in the core and has a modulus and strength of more than or equal to that of natural Bone mechanical properties; with the increase of HA content, skin core structure gradually weakened and disappeared, while the defect increased significantly. When the mass ratio of HA to Vectra A950 was increased to 20:100, the mechanical properties of the composites, especially the toughness, decreased significantly, possibly due to the poor bonding between the HA particles and the liquid crystal matrix. In order to ensure the biological activity of the bionic artificial bone, the content of HA should be close to that of the natural bone. Therefore, the interface between HA and Vectra A950 needs to be modified to improve its bonding performance.