| 학회 | 한국고분자학회 |
| 학술대회 | 2004년 가을 (10/08 ~ 10/09, 경북대학교) |
| 권호 | 29권 2호, p.182 |
| 발표분야 | 고분자 구조 및 물성 |
| 제목 | Effects of polymer matrix on the morphology of electrospun TiO2 nanofibers |
| 초록 | One-dimensional (1-D) nanostructured metal oxides have attracted much attention because of their unique properties and potential applications in electronics, photonics and other related areas. TiO2 is one of the useful materials for environmental cleaning, photocatalysis, gas sensing, batteries, solar cells etc. In this study, TiO2 nanofibers were electrospun from the mixed solution of titanium propoxide and different polymer matrix such as PVAc, PS and PMMA. The electrospun composite fibers were calcined at 450oC to remove polymer matrix and to develop the anatase crystal. The detailed structure of the electrospun TiO2 fibers from PVAc solution after calcination was studied using SEM and selected area electron diffraction (SAED) techniques, as shown in Figure 1a and 1b. It was found that each TiO2 fiber is composed of a bundle structure of ca. 20 nm thick fibrils. The sheath and cores were found to have an islands-in-a-sea morphology. The TiO2 sol precursor is converted to TiO2 gel when the electrospun fibers are exposed to moisture. The solidification occurs faster in the sheath than in the core, in which the micro-phase separation between TiO2 sol and PVAc solution occurred during solidification. Each core fibril is also aligned in the fiber-axis direction, as shown in Figure 1b, which is contrasted to TiO2 fibers obtained using polystyrene and PMMA solution (Figure 1c). TiO2 fibers from PMMA solution show a randomly ordered morphology as Figure 1d. The interaction between the TiO2 sol-gel precursor and matrix polymer was one of the important parameters to control the morphology of TiO2 fibers during electrospinning. Figure 1. Morphology of electrospun TiO2 fibers from PVAc ((a) and (b)) and PMMA ((c) and (d)) solutions. |
| 저자 | 안영락1, 송미연2, 박종래1, 조성무2, 김동영2 |
| 소속 | 1서울대, 2한국과학기술(연) |
| 키워드 | Electrospinning; TiO2 |
