采用溶液共混法制备了炭纤维(CF)增强羟基磷灰石(HA)/聚乳酸(PLA)三元复合生物材料.研究了该复合材料的力学性能和体外降解性能.CF/HA/PLA复合材料具有优异的力学性能,弯曲强度和弯曲模量均随着HA含量的增加先升高后降低,存在一个峰值,可分别达到430 MPa和26 GPa.在PBS模拟体液中降解3个月,弯曲强度和弯曲模量分别下降到初始值的30%和36%.SEM照片显示,降解是从复合材料的界面开始的,降解3个月后,界面结合处出现缝隙,吸水率增加到5%,质量损失只有1.6%.PBS模拟体液的pH值下降在0.1之内,有利于骨折部位的愈合.实验结果表明,该复合材料的机械性能满足骨折内固定材料技术指标的要求.
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