聚乳酸/羟基磷灰石复合材料的制备及其性能研究

Study on preparation and performance of polylactide/hydroxyapatite composites

采用溶液共混、超声振荡的方法制备了聚乳酸/羟基磷灰石（PLA/HA）复合材料,采用扫描电镜、红外光谱对PLA/HA复合材料进行了表征,研究了PLA/HA复合材料的力学性能、亲水性能、热稳定性以及降解性能。结果表明,HA颗粒均匀分散在PLA基体中,没有团聚现象发生;与纯PLA比较,PLA/HA复合材料的弯曲强度提高了7.9 MPa,拉伸强度下降不明显;由于HA的加入,提高了PLA/HA复合材料热稳定性,亲水性能也有所改善;降解过程中,PLA/HA复合材料中的HA颗粒能够中和PLA部分酸性代谢产物,降低了材料自催化效应及产生速度,减缓了材料重量损失速度,前6周的重量损失小于1%,在第12周的最终重量损失为5.8%,降解后期的重量损失比纯PLA材料低3%~4%。

The PLA/HA composites were prepared via solution blending and ultrasonic oscillation. The materials were characterized by SEM and IR. The performance of the PLA/HA composites,such as mechanical properties,hydrophilicity,thermal stability and degradation were studied. The results show that：the HA particles are uniformly dispersed in PLA matrix,there is no agglomeration; Compared with the pure PLA materials,the bending strength of PLA/HA composites are increased 7. 9 MPa,and the decline of the tensile strength of the composite is not obvious; The hydrophilic properties and thermo stability of the PLA/HA composites are improved because of the addition of HA particles. Certain amount acid of metabolites of PLA were neutralized by HA particles in PLA/HA composites during the process of degradation,so self-catalysis effect and speed of the materials are reduced,p H value is improved,and weight loss rate of the materials is slow down. The mass loss of the composites was less than 1% during the initial 6weeks,and the final mass loss was 5. 8% at the 12 th week. The mass loss of the composite was smaller than that of pure PLA materials by about 3% ~ 4% in the mid-later period of degradation.