A Study On Preparation Electrospinning Orientation Nanofibers And Nanofiber Bundles

The rotating drum was used as collector to preparation electrospinning orientation nanofibers. and in order to obtain nanofiber bundles, a novel electrospinning device was studied, meanwhile, the spinning principle, and process parameters of the novel device are primarily discussed.The process parameters of electrospinning polyacrylonitrile (PAN) orientation nanofibers were studied. We chose mass fraction of 12% PAN solution as spinning solution, and spinning voltage is 12kV, spinning distance is 12cm , spinning flow rate of 0.01 ml/min. Comparison with the jet stability and energy saving, we selected the best rotating rate is 18m/min to obtain orientation nanofibers.Added active carbon, LiCl respectively in spinning solution to preparation electrospinning orientation nanofiber membranes, we studied the affect on fiber morphology, structure and mechanical properties. Research found that additive in spinning solution can improve fiber orientation degree, and fiber deposition area on the drum is reduced by adding LiCl. With the increase of activated carbon content, the diameter of fiber gradually increases, and added LiCl, fiber diameter change is not obvious, but when licl content 0.6%, fiber appear cluster phenomenon. By XRD analysis, we found that with the increase of LiCl, the arrangement of polyacrylonitrile macromolecules are significantly. And through mechanical performance analysis found, with the increase of activated carbon content, the mechanical properties of the fiber becomes poor, and activated carbon effect the mechanics properties is obvious. But with the increase of LiCl, fiber breakage strength present first decreased and then increased, and when LiCl content is 0.6%, electrospinning orientation nanofibers has good mechanical properties.Used a funnel type pipe as electrospinning collector, and vacuumize the cylindrical funnel pipe, which makes the whole funnel type pipe form certain air flow, and then the fibers aggregation form fiber bundles. In addition, the spinning process parameters of the novel electrospinning device was carried on the preliminary discussion using 12% of PAN spinning solution, which including spinning distance, spinning feed rate, vacuum pump lashing velocity and so on. Through the experiments, we found that when the spinning distance is 3cm, spinning feed rate is 0.005 ml/min, vacuum suction rate is 6L/s, can obtain the ideal electrospinning nanofiber bundles. And when adding 0.6% of LiCl in the spinning solution, fiber bundles prepared more easily than pure polyacrylonitrile solution.