木质素/PAN共混溶液体系静电纺丝研究

Lignin/polyacrylonitrile (PAN) nanofibers were prepared by electrospinning of lignin/PAN solutions in different blend concentrations. Fibers morphology was observed under a scanning electron microscope (SEM) and effects of processing parameters including electrospinning voltage, flow rate, tip-to-collector distance, and rotational speed on the morphology of electrospun lignin/PAN fibers were studied. With the increase of weight ratio of PAN to lignin, the morphology of fibers was changed from beaded fibers to uniform fibers. The beadless, uniform lignin/PAN nanofibers with a diameter of 200-300nm were obtained when the weight ratio of PAN to lignin is 80%. This results show that it is possible to develop a new precursor material for preparing carbon nanofibers with a blend of lignin and PAN. It was also found that the electrospinning voltage, flow rate and tip-to-collector distance had important influences on the average fiber diameter and diameter distribution, whereas rotational speed could significantly affect the degree of fiber alignment.