Abstract:

PSU fibers with a diameter in a range from nano-scale to micrometer were prepared by electrospinning. The effect of solvent, mass concentration of solution, tip-to-collector distance, voltage, and solution flow on the structure and morphology of eletrospun PSU fibers were investigated by SEM. The results revealed that, with addition of acetone into the pure N, N-dimethylformamide(DMF), the beads on fiber surface disappeared and the fiber diameter decreased firstly and then increased slightly as the dosage of acetone increased. As the mass concentration of PSU/D9A1 solution increased from 13% to 20%, the beads surface generally disappeared and the average fiber diameter increased. With the increase of the tip-to-collector distance and voltage, the amount of beads declined and the fiber diameter firstly increased and then decreased for PSU/D9A1 solution with a mass concentration of 15%, and the fibers obtained from the mass concentration of 20% exhibited no beads and the fiber diameter was ranging from 1.1 to1.7 μm. The fiber diameter increased first and decreased later with the increase of flow from 1.5mL/h to 4.0mL/h.