THF, TCE를 사용한 전기방사법에 의한 고분자량 폴리비닐카바졸 웹의 제조 및 특성(1)

Manufacturing of High Molecular Weight Poly (N-vinyl Carbazole) Web by Electrospinning Using THF, TCE and Its Characterization

Synthetic fibers of polymers have been produced for decades by conventional process, such as melt spinning, dry spinning or wet spinning. These techniques rely upon pressure-driven extrusion of a viscous polymer fluid and produce fibers that typically range from 10 to 500 ㎛ in diameter. Electrostatic fiber spinning, or ‘electrospinning,’ is a novel process for forming fibers with submicron-scale diameters through the action of electrostatic forces. Concentration of poly(N-vinyl carbazole) (PVCz) solution was varied from 3 to 18 wt%. All electrospinning procedures were carried out at room temperature. Applied voltage was ranged from 15 to 30 kV. Tip-to-collector distance (TCD) was varied from 10 to 40 cm. In the cases of, using THF and TCE as a solvent, at relatively lower concentration, bead and bead-onto-fiber were formed, comparing that with respect to fiber was found at relatively higher concentration. Increasing both the applied voltage and the TCD tended to produce smaller diameters of the electrospun fibers. The average diameter of PVCz fibers in web electrospun in TCE was much finer than that in THF. PVCz fibers in web prepared using high initial polymer concentration in THF were not cylindrical but planar similar with ribbon, owing to the difference in the viscosities and in evaporation in the rates of the solvent and the solutions.