取向聚乳酸纳米纤维的制备及其性能

Preparation and properties of aligned poly (L-lactic acid) nanofibers

静电纺取向纳米纤维具有各向异性的微观结构与较高的力学性能,因此具有更广泛的应用。利用一种新型的静电纺收集装置制备取向聚乳酸(PLLA)纳米纤维,该收集装置包括一个旋转的滚筒和两块平行电极。为进一步研究该收集装置制备取向纳米纤维的机理,利用Ansoft Maxwell电磁模拟软件模拟了静电纺过程中的电场分布。制得的取向PLLA纳米纤维的直径为(405±102)nm,扫描电子显微镜(SEM)显示,该PLLA纳米纤维具有较好的取向性,取向排列程度为91.2%。力学拉伸试验显示,取向PLLA纳米纤维的力学性能具有各向异性,其拉伸强度、断裂伸长率和杨氏模量都远大于普通非取向PLLA纳米纤维。

Aligned electrospun nanofibers,which possessed anisotropic microstructure and better mechanical properties,had more promising application. A novel electrospinning collector,consisting of a rotating drum and 2 parallel electrodes,was used to prepare aligned nanofibers. To further validate the fabrication of aligned nanofibers,the electric field distribution of electrospinning was simulated by the electromagnetic simulation software,Ansoft Maxwell. Well-aligned poly（ L-lactic acid）（ PLLA） with the diameter of（ 405 ± 102） nm nanofibers was manufactured and scanning electron microscopy（ SEM） images showed that the aligned PLLA nanofibers had directional morphology with aligned degree of 91. 2%. The tensile test expressed that aligned PLLA nanofibers possessed anisotropic mechanical properties,and their tensile strength,tensile strain and Young＇s modulus were remarkably higher than random PLLA nanofibers.