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为了改善左旋聚乳酸(PLLA)的降解性,采用溶液共混法将PLLA和MgO纳米颗粒(MgO-NPs)进行复合,制备了一种具有良好力学性能的骨修复复合材料。结果显示:改性MgO纳米颗粒(g-MgO-NPs)在PLLA基体中的分散效果及界面结合性比未改性的好。4%(质量比)g-MgO-NPs的添加量使薄膜的拉伸强度从10.6 MPa增大到30.1MPa,断裂伸长率从71%减小为59%,并使薄膜降解后的pH值趋于稳定,基本接近生理盐水的pH值。由此表明:g-MgO-NPs在一定程度上能改善聚乳酸复合膜的降解性及其力学性能。
In order to improve the degradability of PLLA, PLLA and MgO nanoparticles (MgO-NPs) were prepared by solution blending method to prepare a bone-repairing composite with good mechanical properties. The results show that the dispersion effect and interfacial bonding of modified MgO nanoparticles (g-MgO-NPs) in PLLA matrix are better than those of unmodified ones. The addition of 4% (mass ratio) g-MgO-NPs increased the tensile strength of the film from 10.6 MPa to 30.1 MPa, the elongation at break from 71% to 59%, and the pH of the film after degradation Stable, almost close to the pH value of saline. The results show that g-MgO-NPs can improve the degradability and mechanical properties of polylactic acid composite films to a certain extent.