Authors: T.S. Hwang, E.J. Choi, N.S. Kwak
Affilation: Chungnam National University, Korea
Pages: 893 - 896
Keywords: high impact polystyrene (HIPS), nanofiber, electrospinning, sulfonation, ion exchange capacity (IEC)
The study of nanofibers has been a subject of intensive research because of their unique properties and widespread applications in many areas. Among the various methods used to prepare nanofibers, electrospinning has been very attractive in the past decade because it is a simple and versatile approach for producing a matrix of fibers with diameters ranging from a few nanometers to micrometers. In this study, the electrospinning of solutions of HIPS in DCE and DMF was completed, and nanometer fibers of HIPS were prepared. We obtained high capacity HIPS cation exchange nanofiber by sulfonation and evaluated the performance of HIPS cation exchange nanofiber. The HIPS ion-exchange nanofiber was prepared by electrospinning, crosslinking and sulfonation reaction. The spinning HIPS solutions were prepared by dissolving in co-solvent which was 1,2-dichloroethane (DCE) and N,N-dimethylformamide (DMF) involved divinylbenzene as crosslinking agent. HIPS nanofiber was sulfonated using sulfuric acid as sulfonating agent at 60 oC. The chemical properties of HIPS cation exchange nanofiber such as FT-IR, X-ray photoelectron spectroscopy (XPS), water uptake, ion exchange capacity (IEC), morphology and contact angle were evaluated FT-IR spectral analysis, XPS apparatus, via titration, scanning electron microscopy (SEM) observation and contact angle meter. We were able to confirm sulfonated HIPS nanofiber from Figure 1, the OH characteristic peak from sulfuric acid which occurs at near 3,450 cm-1 has increased with increasing the sulfonation time. The SO3- group antisymmetric and symmetric vibrational adsorption peaks were found at about 1184 cm-1 and 1042 cm-1, respectively. The morphology of surface of HIPS nanofiber was observed by SEM images. Figure 2 shows SEM images of HIPS nanofiber. We founded that the morphology of surface of HIPS nanofiber was roughed and the diameter of HIPS nanofiber was increased with increasing the sulfonation time.