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采用液相吸附法制备了羟基磷灰石/外消旋聚乳酸[hydroxyapatite/poly-D,L(racemic)lactic acid,HA/PDLLA]复合材料,通过材料实验机和体外模拟试验研究了复合材料的力学性能和体外降解性能。对材料的力学测试表明,由于加入了质量分数为10%的HA颗粒,复合材料的力学性能得到了改善,复合材料的弯曲强度达146.2MPa,弯曲模量为2.5GPa,与纯PDLLA材料相比,弯曲强度提高了9.4MPa,弯曲模量提高了0.2GPa,同时其拉伸强度下降并不明显。体外降解模拟试验结果表明,HA含量为10%的复合材料在前6周的质量损失小于1%。在第12周的最终质量损失为5.4%,其在降解中后期的质量损失比纯PDLLA材料低约2%～3%。
Hydroxyapatite / poly-D, L (racemic) lactic acid, HA / PDLLA] composites were prepared by liquid-phase adsorption method. The effects of composite materials The mechanical properties and in vitro degradation properties. Mechanical tests on the materials show that the mechanical properties of the composites are improved due to the addition of HA particles with the mass fraction of 10%. The flexural strength of the composites reaches 146.2MPa and the flexural modulus is 2.5GPa. Compared with the pure PDLLA material , Flexural strength increased 9.4MPa, flexural modulus increased 0.2GPa, while its tensile strength is not obvious. In vitro degradation simulation results showed that the mass loss of the composites with HA content of 10% in the first 6 weeks was less than 1%. The final mass loss at week 12 was 5.4% with a mass loss of about 2% to 3% lower than that of pure PDLLA material during mid-to-late degradation.