聚己内酯取向纳米纤维纱线的制备及其织物的拉伸性能

Preparation of Highly Aligned Polycaprolactone Nanofiber Yarn and Tensile Properties of Its Fabric

以可生物降解的聚己内酯(PCL)为原料,以三氟乙醇(TFEA)为溶剂,采用改进的静电纺丝(静电纺纱)技术成功制备了PCL取向纳米纤维纱线.研究了不同静电纺纱工艺参数(溶液浓度、电压、纺丝距离)对PCL纳米纤维纱线的制备以及形态的影响.选定较优的纺纱工艺参数:溶液质量浓度为0.10g/mL,纺丝电压为9kV,纺丝距离为20cm,以该纺纱参数制得PCL纳米纤维纱线,其平均直径为180μm,内部纤维的平均直径为600nm,且纳米纤维沿着纱线轴向高度取向排列.将PCL纳米纤维纱线应用于传统纺织技术,以PCL取向纳米纤维纱线为纬纱,以聚乳酸(PLA)微米长丝为经纱,制备平纹织物小样.将该平纹织物和PCL纳米纤维膜的拉伸性能和孔径分布进行对比分析,结果表明:平纹织物纳米纤维纱线方向的拉伸性能明显高于PCL纳米纤维膜的拉伸性能;另外,与PCL纳米纤维膜相对比,PCL纳米纤维纱线的平纹织物具有大孔径结构,更有利于细胞生长,进一步表明其在组织工程领域具有广阔的应用前景.

Highly aligned polycaprolactone （PCL） nanofiber yarns were continuously prepared from PCL/ trifluoroethanol（TFEA） solution by utilizing a novel modified electrospinning method. The effects of different spinning parameters, including solution concentration, applied voltage, and distance between two needles, were investigated on yarn formation and morphology of the nanofibers and the yarns. The results show that the more optimal electrospinning parameters are solution mass concentration 0.10 g/mL, applied voltage 9 kV, distance between two needles 20 cm, and the highly aligned PCL nanofiber yarns with average diameter of yarns and internal fibers at 180 μm and 600μm respectively can be obtained. Then, the as-prepared PCL nanofiber yarns were employed to prepare plain weaving fabric by traditional textile technique, using PCL nanofiber yarns as weft and polylactic acid （PLA） micro- filament yarns as warp. Tensile properties and pore size distribution were compared between PCL nanofiber yarns-based weaving fabrics and PCL nanofiber mats. The results show that the nanofiber yarns-constructed direction of the weaving fabrics shows higher mechanical performances than that of nanofiber mats. Furthermore, the plain weaving fabrics possess larger pore sizes in comparison with random nanofiber mats, which facilitates the growth of cells, and furtherly demonstrates that PCL nanofiber yarns are great of interesting for the application in tissue engineering.