双轴向不同拉伸速率下丝素蛋白/聚己内酯复合纳米纤维膜的力学性能

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

对静电纺丝素蛋白(SF)/聚己内酯(PCL)复合纳米纤维膜在拉伸速率比为1∶1、2∶1、5∶1、8∶1下进行双轴向拉伸破坏实验和在拉伸速率比为1∶1、2∶1、4∶1、5∶1、8∶1下进行双轴向循环拉伸实验。结果表明,静电纺纳米纤维膜拉伸断裂负荷与施加的拉伸速率比有关,静电纺纳米纤维膜在循环载荷作用下具有非线性非弹性的特性。对双轴向循环拉伸负荷与伸长率曲线进行拟合,建立了静电纺纳米纤维膜在双轴向循环拉伸加载段的数学模型。以拉伸速率比为4∶1的循环拉伸曲线为例,运用该数学模型所得曲线与实验曲线比较一致,证实模型有效。

Biaxial tensile tests of electrospun silk fibroin （SF）/poly（e-caprolactone） （PCL） composite nanofibrous membranes were done in this paper. The biaxial tensile failure experiment was carried out under tensile rate ratios of 1： 1, 2： 1, 5： 1, 8： 1, and the biaxial cyclic tensile experiment were carried out under tensile rate ratios of 1： 1, 2： 1, 4： 1, 5： 1, 8： 1. The results indicate that the tensile breaking load of electrospun composite nanofibrous membranes is closely related to the tensile rate ratios, and the biaxial tensile mechanical properties under cyclic loads are nonlinear and inelastic. In this paper, mathematical model describing the relationship between tensile loading and stretch rate during biaxial cyclic tensile testing was established through fitting the experimental curve, and it was applied to biaxial cyclic tensile testing under tensile rate ratio of 4： 1. The consistence of the modeling and experimental curves verifies that the mathematical model is effective.