| 학회 | 한국고분자학회 |
| 학술대회 | 2005년 가을 (10/13 ~ 10/14, 제주 ICC) |
| 권호 | 30권 2호 |
| 발표분야 | 고분자 가공/블렌드 |
| 제목 | Protuberant Morphology of Electrospun Polystyrene Fibers |
| 초록 | Even though in the past few years there has been much progress in the area of electrospinning owing to the efforts of many research groups, electrospinning is still one of the most powerful tools for fabricating nano- to micron-size structures and materials with a broad range of functionalities.1,2 They can be used for a variety of applications including photonics, sensors, catalysis, membranes, filters and biomedical and pharmaceutical products.1,2 However, many technical issues still need to be resolved before the full potential of electrospinning will be realized. First of all, it is necessary to systematically investigate the correlation between the secondary structure of electrospun nanofibers and the processing parameters, e.g., solvents contained in the polymer solution. It is also important to organize nanofibers of various types (e.g. porous, hollow, and core/shell) into well-defined hierarchical structures in order to fully exploit their potential in device fabrication and material development.1-10 From this point of view, we have, for the first time, produced a unique morphology on the surface of electrospun polymer fibers using a non-volatile solvent, e.g., N,N-dimethyl formamide (DMF) (b.p.; 153 oC, vapor pressure; 2.6 mmHg at 20 oC), which is quite different from the porous structure observed on polymer fibers electrospun from volatile solvents, e.g. tetrahydrofuran (THF). A unique, cucumber-like surface structure was obtained on the electrospun polymer fibers using relatively concentrated solutions (＞ 30 wt%) (Fig. 1.). It is believed that the non-volatility of the solvent, the high viscosity of the polymer solution and the large diameter of the fiber retarded rapid evaporation of the solvent. Moreover, the residual solvent entrapped inside the fiber induced an extrusive force, which eventually yielded a unique surface structure such as small protuberances. We believe that this unique surface morphology would increase the surface area of the electrospun fibers and be able to control the wetting or the adsorption behavior. Fig. 1. SEM images of the electrospun PS fibers. References 1. Li, D.; Xia, Y. Adv. Mater. 2004, 16, 1151. 2. Bognitzki, M.; Czado, W.; Frese, T.; Schaper, A.; Hellwig, M.; Steinhart, M.; Greiner, A.; Wendorff, J. H. Adv. Mater. 2001, 13, 70. 3. Bognitzki, M.; Hou, H.; Ishaque, M.; Frese, T.; Hellwig, M.; Schwarte, C.; Schaper, A.; Wendorff, J. H.; Greiner, A. Adv. Mater. 2000, 12, 637. 4. Czaplewski, D. A.; Kameoka, J.; Mathers, R.; Coates, G. W.; Craighead, H. G. Appl. Phys. Lett. 2003, 83, 4836. 5. Jarusuwannapoom, T.; Hongrojjanawiwat, W.; Jitjaicham, S.; Wannatong, L.; Nithitanakul, M.; Pattamaprom, C.; Koombhongse, P.; Rangkupan, R.; Supahol, P. Euro. Polym. J. 2005, 41, 409. 6. Wannatong, L.; Sirivat, A.; Supaphol, P. Polym. Int. 2004, 53, 1851. 7. Koombhongse, S.; Liu, W.; Reneker, D. H. J Polym Sci Part B: Polym Phys 2001, 39, 2598. 8. Lee, K.H.; Kim, H.Y.; Bang, H.J.; Jung, Y.H.; Lee, S.G. Polymer 2003, 44, 4029. 9. Megelski, S.; Stephens, J. S.; Chase, D. B.; Rabolt, J. F. Macromolecules 2002, 35, 8456. 10. Casper, C. L.; Stephens, J. S.; Tassi, N. G.; Chase, D. B.; Rabolt, J. F. Macromolecules 2004, 37, 573. |
| 저자 | 강민성, 진형준 |
| 소속 | 인하대 |
| 키워드 | electrospinning; polystyrene; N; N-dimethylformamide (DMF); surface morphology |
