Department of Textile Engineering, Amirkabir University of Technology, Tehran, Iran.
Biofabrication. 2013 Sep;5(3):035014. doi: 10.1088/1758-5082/5/3/035014. Epub 2013 Aug 14.
An electrospinning technique based on the use of two oppositely charged nozzles was applied to fabricate continuous twisted yarns of poly(L-lactide) (PLLA) nano/micro fibers. In this study, the effect of solvent on the electrospinning of PLLA fibrous yarns was investigated. For this purpose, yarns were electrospun using chloroform, dichloromethane or 2,2,2-trifluoroethanol as solvents at a PLLA concentration of 7 wt%. The analysis of the morphology, diameter, crystallinity and mechanical properties of electrospun yarns revealed that the vapor pressure of the solvent plays an important role. Whereas the fiber diameter decreased, the crystallinity of the fibers increased using a solvent with lower vapor pressure. In addition, mechanical properties (e.g., tensile strength and modulus) revealed that the yarns composed of fibers with smaller diameters showed higher tensile strength and modulus. In summary, fine-tuning solvent properties resulted in a modulation of fiber diameter, crystallinity, and thereby yarn mechanical properties, and are important factors to consider in the fabrication and application of electrospun yarns.
采用基于两个带相反电荷的喷嘴的静电纺丝技术，制备了聚（L-丙交酯）（PLLA）纳米/微纤维的连续扭结纱线。在这项研究中，考察了溶剂对 PLLA 纤维纱线静电纺丝的影响。为此，在 PLLA 浓度为 7wt%的情况下，使用氯仿、二氯甲烷或 2,2,2-三氟乙醇作为溶剂进行纺丝。对电纺纱线的形态、直径、结晶度和力学性能的分析表明，溶剂的蒸气压起着重要的作用。而当使用蒸气压较低的溶剂时，纤维直径减小，纤维的结晶度增加。此外，力学性能（如拉伸强度和模量）表明，由直径较小的纤维组成的纱线具有更高的拉伸强度和模量。总之，精细调节溶剂性质导致纤维直径、结晶度以及纱线力学性能的调制，这是在静电纺丝纱线的制造和应用中需要考虑的重要因素。
