| 학회 | 한국고분자학회 |
| 학술대회 | 2005년 봄 (04/14 ~ 04/15, 전경련회관) |
| 권호 | 30권 1호, p.57 |
| 발표분야 | 고분자 구조 및 물성 |
| 제목 | Highly Ordered Microstructures of Poly(styrene-b-isoprene) Block Copolymers induced by Solution Meniscus |
| 초록 | Microstructures of hundreds of micron thick poly(styrene-block-isoprene) copolymer films solution-cast in a cylindrical tube with the solvent evaporation controlled were investigated by transmission electron microscope (TEM), small angle X-ray scattering (SAXS) and optical microscope (OM). In a block copolymer with cylindrical polyisoprene microdomains, the orientation of the cylinders was varied along radial direction of the cylindrical tube. Highly aligned hexagonal arrays of in-plane polyisoprene cylinders were formed with their cylindrical axis parallel to the circumference of the tube in the regimes close to the wall edge. In contrast randomly ordered microdomains were observed at the center of the tube. We have also found that the orientation depends on the solvent evaporation rate and an intermediate rate (~2.3 nL/s) provides the best orientation. In the case of a block copolymer with a bicontinuous double gyroid structure, we obtained a globally ordered microstructure where [111] crystallographic direction was parallel to the circumference of the tube. For both block copolymers, the area of highly ordered arrays of nanoscopic domains is over 1 mm2. Development of the orientation was explained by coupling two orthogonal fields: the flow of a solution induced by strong capillary force at a meniscus between a side wall of the cylinder tube and a block copolymer solution and solvent evaporation (a) (b) 그림 1. (a) A SAXs image of ordered double gyroid. (b) A TEM image |
| 저자 | 홍재민1, 황지영1, 박철민2 |
| 소속 | 1한국과학기술(연), 2연세대 |
| 키워드 | block copolymer; orientation; meniscus; hexagonal packed cylinder; double gyroid |
