| 학회 | 한국고분자학회 |
| 학술대회 | 2004년 가을 (10/08 ~ 10/09, 경북대학교) |
| 권호 | 29권 2호, p.215 |
| 발표분야 | 고분자 구조 및 물성 |
| 제목 | Molecular organization of Poly (2-vinylpyridine-b-hexyl isocyanate) rod-coil diblock copolymers at the air/water Interface |
| 초록 | There has recently been much interest in rod-coil block copolymer due to their applications in biomimetic chemistry, molecular electronics, and materials science. Self organization of these molecules through non-covalent interactions has the vast potential for the development of well articulated structures, with unique properties1. To control the self-organizing forces and morphology, the interfacial behavior of the rod-coil system at the monomolecular level must be well understood. In this work, we conducted a systematic study for the complete range (5%-90% of rod mole percentage) of an amphiphilic rod-coil system, poly (hexyl isocyanate)-b-(2-vinylpyridine) at the air/water interface. We applied Langmuir balance technique and scanning probe microscopy (SPM) for the complete characterization of the monolayer at the air/water and air/solid interface respectively. The phase isotherms showed the well amphiphilic balance for the diblock copolymers, and the formation of stable monolayer. Further the continuously increased packing of the monolayer was observed by the comparative study of phase isotherms from 5%-90%. SPM characterization showed their interesting morphology according to the varying rod mole percentage in the rod-coil system. Rod mole percentage 5% showed micellar morphology, whereas rod mole percentage 10-15% showed the similar but smaller morphology as 5%. Rod mole percentage 23%-32% showed distinct and dispersed rods, whereas rod mole percentage 70%-90% showed well packed structure similar to lamella phase. Further we analysed our experimental results under the light of well developed theoretical models2. We found that the tendency of the diblock system to adopt a packed monomolecular structure has increased by the increasing rod content. This lead us to conclude that it was the rod part that governs mostly the interfacial behavior of rod-coil block copolymers. The above conducted study was found to be well consistent with the theoretical study for the rod-coil block copolymer systems. This work was funded in part by KAERI (Korea Atomic Energy Research Institute) [1] G. M. Whiteside, J. P. Mathias, C.P. Seto, Science. 254 (1991) 1312. [2] D. R. M. Williams, G. H. Fredrickson, Macromolecules. 25 (1992) 3561. |
| 저자 | Farhan Ahmad1, 신관우2, 한상호1, 이재석2 |
| 소속 | 1광주과학기술원, 2광주 과학기술원 |
| 키워드 | rod-coil diblock copolymer; |
