| 학회 | 한국고분자학회 |
| 학술대회 | 2005년 가을 (10/13 ~ 10/14, 제주 ICC) |
| 권호 | 30권 2호 |
| 발표분야 | 자기조립형 기능성재료 |
| 제목 | Morphological Conversion in Single-Layered Films of Diblock Copolymer Micelles by Solvent Vapor Treatment |
| 초록 | We investigated morphological changes in single-layered films of polystyrene-block-poly(4-vinyl pyridine), PS-PVP, diblock copolymer micelles by solvent vapor treatment. In toluene, a selective solvent for the PS block, nanometer-sized spherical micelles of PS-PVP consisting of the PS corona and the PVP core were formed. From this micellar solution, a single-layered film of micelles was fabricated on silicon wafers or mica substrates by spin coating. The film was made of hexagonal arrays of micelles in short-range order. When the micellar film was exposed to THF vapor, a long-range order of micelles with the narrow size distribution was induced, which was almost perfect hexagonal based on the Voronoi analysis. When the micellar film in long-range hexagonal order was subsequently exposed to DMF vapor, a non-selective neutral solvent for PS-PVP, cylindrical or lamellar morphology was observed depending on the composition of PS-PVP, which was expected as bulk morphology of PS-PVP used. Furthermore, the cylindrical or lamellar morphology was converted back to the micellar morphology by THF vapor treatment. Fig 1. TEM images of a single-layered film of PS-PVP micelles: (a) as spin-coated; (b) after THF vapor treatment; (c) after DMF vapor treatment. PVP blocks were stained with I2 and appeared as dark domains. |
| 저자 | 윤상현1, 손병혁2, 정진철1, 진왕철1 |
| 소속 | 1포항공과대, 2서울대 |
| 키워드 | diblock copolymer micelle; single-layered films; solvent vapor treatment |
