【摘要】 以纳米羟基磷灰石(nano-HA)和聚己内酯(PCL)为原料,通过熔融共混方式制备不同nano-HA含量的PCL/nano-HA复合材料。采用熔体微分3D打印机打印PCL/nano-HA复合材料测试试样,测试其力学性能,并通过差示扫描量热仪和X射线衍射仪进行了分析。结果表明:随着nano-HA质量分数的增加,PCL/nano-HA复合材料3D打印试样的拉伸强度和弯曲强度均呈现先增大后减小的趋势,而压缩强度一直增大,结晶性能变好;当nanoHA质量分数为20%时,3D打印试样的拉伸强度和弯曲强度均达到最大值,分别为23.3MPa和21.4MPa;当压缩应变为10%时,nano-HA质量分数为40%的PCL/nano-HA复合材料试样的压缩应力为最大值,为31.4MPa。PCL/nano-HA复合材料打印试样中只含nano-HA和PCL两种相,有利于其保持良好的生物活性,有望在生物组织支架中得到应用。更多还原

【Abstract】 The polycaprolactone(PCL)/nano-hydroxyapatite(nano-HA) composites with different content of nano-HA were prepared by melt blending using nano-HA and PCL as raw materials. The PCL/nano-HA composite standard mechanical test specimens were printed by a melt differential 3D printer to characterize the mechanical properties of the PCL/nano-HA composite,and the composite was analyzed by differential scanning calorimeter and X-ray diffractometer. The results show that with the increase of nano-HA mass fraction,the tensile strength and bending strength of PCL/nano-HA composite 3D printed specimens first increase and then decrease,the compressive strength increases,the crystallization performance becomes better. When the nano-HA mass fraction is 20%,the tensile strength and flexural strength of the 3D printed specimens are the largest,23.3 MPa and 21.4 MPa respectively. When the nano-HA mass fraction is 40% and the compressive strain is 10%,the composite specimen has the largest compressive stress of 31.4 MPa. The PCL/nano-HA composite printed specimen contains only nano-HA and PCL phases,which is beneficial to maintain its good biological activity,and it is expected to be applied in biological tissue scaffolds.更多还原