Study On Properties And Structure Of Electrospun Functional PSA Composite Nanofiber

Electrospinning, a new method to prepare nanofibers, is attracting more and more attentions from the scholars and more100kinds of nanofibers have been produced by electrospinning. However, the electrospining technique used for the Polysulfonamide fiber (PSA) solution is limited and further study is required to carry out comprehensively. The effects of some electrospinning parameters on the morphology and properties of electrospun PSA nanofibers were investigated. At the same time, electrospun PSA nanocomposite fibers were prepared by electrospinning composite solution composed of PSA matrix and muti-walled carbon nanotubes (MWCNT) and nano-TiO2nanoparticles.A set of self-sembly electrospinning setup was employed to electrospin PSA solution. The effects of solution concentration, applied voltage and Tip-target distance on the morphology and properties of electrospun PSA nanofibers were evaluated. The morphology of the electrosppun PSA nanofbers were analyzed by SEM. It was found The experimental results indicate that the morphology of PSA fibers ranged from irregular (beaded) to uniform structure with an increase of solution concentration; the thickness and its variance of the PSA fibers were decreased with the increasing of applied voltage; Tip-target distance has complicate effect on the electrospun PSA fiber morphology. When the distance is increased from10to15cm, the mean diameter of fibers is decreased gradually and the adhesion phenomenon among fibers can be remitted. However, with a further increase in distance to25cm, the mean diameter tends to increase. The crystallinity of the PSA fibers was measured by X-ray diffraction (XRD) and Thermogravimetric analysis (TGA) was employed to investigate the thermal property of PSA fibers. Spinning parameters have effects on the crystallinity of PSA fibers. When the concentration ranged from6%to10wt%, the crystallinity of fibers gradually increased. However, with a further increase in concentration, the crystallinity of PSA fibers gradually decreased; the crystallinity of fibers gradually decreased with an increase of applied voltage; when the distance is increased from10to20cm, the mean diameter of fibers is decreased gradually. However, with a further increase in distance, the crystallinity of PSA fibers has the trend of decreasing. With an increase of PSA solution concentration, the thermal stability of PSA fibers manufactured gradually increased; when the applied voltage was increased, the heat resistance of PSA fibers gradually decreased; the fibers manufactured with12wt%solution concentration,28kv applied voltage and15cm tip-target distance showed the worst heat resistance.PSA composite nanofibers (PSA/MWCNT, PSA/nano-TiO2and PSA/MWCNT/nano-TiO2) were prepared by built devices. The morphology and microstructure of the composite nanofibers were analyzed by SEM and TEM; the composition of the PSA composite fibers was measured by Fourier Transform Infrared Spectroscopy (FTIR) and The crystallinity of the PSA fibers was measured by X-ray diffraction (XRD). Effects of nano-additices on the properties, such as the mechanical property, thermal property, electrical conductivity and the UV resistance of PSA composite fibers were investigated by characterization method.