| 학회 | 한국고분자학회 |
| 학술대회 | 2004년 가을 (10/08 ~ 10/09, 경북대학교) |
| 권호 | 29권 2호, p.70 |
| 발표분야 | 기능성 고분자 |
| 제목 | Self-Assembly of Rod-Coil Molecules into Molecular Length-Dependent Organization |
| 초록 | A series of rod-coil molecules (n-x, where n represents the number of repeating units in a PPO coil and x the number of phenyl groups in a rod segment) with variation in the molecular length, but an identical rod to coil volume ratio was synthesized, and their self-assembling behavior was investigated by using DSC and X-ray scatterings. The molecule with a short rod-coil molecule (16-4) shows a 3-D tetragonal structure based on a body-centered symmetry of the discrete bundles in addition to a lamellar structure. This 3-D lattice, on heating, collapses to generate a disordered micellar structure. Remarkably, the molecules based on longer molecular length (21-5 and 24-6) were observed to self organize into, on heating, lamellar, tetagonally perforated lamellar, 2-D hexagonal columnar and finally disordered micellar structures(Figure1). Further increase in the molecular length as in the case of 29-7 and 32-8 induces a 3-D hexagonally perforated lamellar structure as an intermediate structure between the lamellar and tetragonally perforated lamellar structures(Figure 2). Consequently, these systems demonstrate the ability to regulate the domain nanostructure, from 2-dimensionally continuous layers, long strips to discrete bundles via periodic perforated layers by small changes in the molecular length, at an identical rod-to-coil volume fraction. Figure 1. Schematic representation of self-assembly of 21-5 into (a) lamellar, (b) tetagonally perforated lamellar, (c) 2-D hexagonal columnar and (d) disordered micellar structure. Figure 2. Schematic representation of self-assembly of 29-7 into a perforated lamellar structure with (a) 3-D hexagonal lattice and (b) 3-D tetragonal lattice. |
| 저자 | 유자형1, 이명수1, 오남근1, 진왕철2 |
| 소속 | 1연세대 화학과 초분자나노조립체연구단, 2포항공대 신소재공학과 |
| 키워드 | supramolecular structures; identical volume ratio; tetragonally perforated lamellar; hexagonally perforated lamellar |
