Preparation And Property Of Crystalline Polymer Fibers Via Elctrospinning

Electrospinning is a process for utilizing electrostatic forces on the surface of a polymer solution or melt to produce fibers. Because electrospun fibers were fine, resulting that high specific surface area and porosity which led themselves to a wide applications. Recently, electrospinning already became investigative hotspot. In this paper, poly(ethylene oxides) electrospun fibers, poly(vinyl alcohol) hybrid electrospun fibers and nylon 66 electrospun fibers were prepared. Our studies focused on dispersing morphology and crystallization property of electrospun fibers in different technological parameters.PEO/water solutions were electrospun in different technological parameters to prepare superfine nanofibers. Dispersing morphology and diameter of electrospun fibers was characterized by SEM which was affected by the concentration, the voltage and the distance between two electrodes. Electrospun fibers gradually became fine if the concentration was reduced, the voltage was increased and the distance between two electrodes was boosted. In all parameters, the concentration was the key factor. Crystal property of electrospun fibers was characterized by DSC and XRD. Compared with PEO powder, electrospun fibers were difficult to crystallze, whose crystallinity was declined.Different silica contents of Poly(vinyl alcohol)/Silica hybrid fibers had been prepared by Sol-Gel process and electrospun technique. XRD indicated that crystallinity of hybrid electrospun fibers declined comparing with pure PVA electrospun fibers, which was because of forming net configuration. FTIR showed hydroxyl in PVA condensed with hydroxyl of hydrolyzing Tetraethoxysilane, fiber material was existed with network configuration. This was accord with XRD analyse. FESEM revealed that when PVA/SiO2 (mass ratio) was 4/1 ,the fibers smoothed and uniformed . With increasing of silica content, fibers diameter became fine and spindly beads increased. The fibers diameter became fine, round beads increased and a part of fibers occured rupture after adding electrolyte NaCl and MgCl₂.Nylon 66 fibers were prepared from solutions with formic acid in different technological parameters via electrospinning. Dispersing morphology and diameter of electrospun fibers was characterized by FESEM which was affected by theconcentration, the voltage and the distance between two electrodes. In all parameters, the concentration was the key factor. Electrospun fibers gradually became fine if the concentration was reduced, the voltage was increased and the distance between two electrodes was boosted. Crystal property of electrospun fibers were characterized by XRD, which indicated nylon 66 fibers crystallinity declined. Crystallinity was also affected by voltage, which was declined if voltage increased.