聚D,L-乳酸/羟基磷灰石复合纤维的力学性能研究

采用熔融纺丝法制备PDLLA／HA复合纤维，探讨PDLLA／HA复合纤维的力学性能及影响因素和性能变化规律。实验结果表明：在分子量为12万的PDLLA中，加入一定量4～20μm的HA颗粒能提高复合纤维的力学性能。在PDLLA基体中添加HA的质量分数以10％为宜，以此配比制备的复合纤维的断裂强度高于其它配比复合纤维的断裂强度。采用分子量为20～30万的PDLLA制备的复合纤维断裂强度高，性能优异。复合纤维断裂强度随纤维直径的增加而下降，在直径为40～60μm时，复合纤维断裂伸长率高，弹性好。

A Study on the Mechanical properties of Poly-D,L-lactic Acid/Hydroxyapatite Compound Fibers

The PDLLA/HA compound fibers with excellent properties could be obtained by melt-spinning. This study inquired about the mechanical properties, change rule and influencing factors. The results showed that the composites fibers of mechanical properties were good in the PDLLA(molecular weight 120,000) to which were added the 4-20 microm HA particles. In the matrix of PDLLA with accretion (10%) of HA particles, the tensile strength of the compound fibers was the highest, compared with the others. The tensile strength of the compound fibers of PDLLA (molecular weight 20,000-300,000) was high. The tensile strength of the compound fibers decreased with the increase of the fiber diameter, and the PDLLA/HA fibers 40-60 micrometers in diameter had the highest elongation at break.