取向排列丝素蛋白/聚已内酯复合纳米纤维膜的双轴向拉伸性能

 以滚筒为收集装置，用静电纺丝技术制备了有序排列的丝素蛋白/聚己内酯（SF∕PCL）复合纳米纤维膜。利用FE-SEM和MATLAB软件对不同转速下收集的SF/PCL纳米纤维的形貌及排列有序程度进行表征；利用双轴拉伸试验仪对纳米纤维膜的力学性能进行测试。结果表明：滚筒转速越大，纳米纤维排列有序程度越高；纳米纤维膜力学性能表现出各向异性，同时具有明显的非线性和非弹性。对实验曲线进行拟合，建立了纳米纤维膜在双轴循环拉伸作用下的拉伸负荷-伸长率数学模型。以滚筒转速4.70m/s的试样为例，数学模型拟合曲线与实验曲线具有较高的一致性。

Mechanical properties of electrospun aligned silk fibroin/poly(ε-caprolactone) nanofibrous membranes under biaxial tensile loads

Aligned silk fibroin (SF)/poly(ε-caprolactone) (PCL) composite nanofibrous membranes were fabricated by electrospinning with a rotating drum as a collector. FE-SEM was used to characterize the morphologies of nanofibers and the degree of orientation of nanofibers was evaluated by MATLAB. And the mechanical properties of electrospun nanofibrous membranes were tested by compact biaxial tensile tester. The results showed that the degree of orientation of nanofibers was improved with increasing the rotation speed of the drum. The nanofibrous membranes exhibited an anisotropic mechanical behavior. Meanwhile the membranes obviously behaved the characteristics of nonlinearity and unelasticity. A mathematical model of relationship between tensile loading and stretch rate under biaxial cyclic tensile action was established by fitting the experimental curve. Taking the sample obtained while the drum rotated at 4.70m/s as an illustration, the model fitting curve is highly consistent with the experimental curve.