| 학회 | 한국고분자학회 |
| 학술대회 | 2005년 가을 (10/13 ~ 10/14, 제주 ICC) |
| 권호 | 30권 2호 |
| 발표분야 | 고분자 구조 및 물성 |
| 제목 | Thickness-Dependent Nanostructures in Thin Films of Cylinder-Forming Diblock Copolymers |
| 초록 | Diblock copolymers self-assemble into phase-separated domains (typically sphere, cylinders, and lamellae) on the scale of tens of nanometers. Their size and morphology depend on the molecular weight and composition of copolymers. In thin films of diblock copolymers, additional constraints of commensurability between domain periods and film thicknesses as well as interfaces between copolymers and substrates play important roles. Nanostructures of thin films of polystyrene-poly(4-vinyl pyridine), PS-PVP, diblock copolymers, exhibiting bulk cylindrical PVP nanodomains were investigated. PVP blocks have a strong interaction with polar substrates such as mica and silicon wafers having native oxide layers. Morphological changes of PS-PVP copolymers with various film thicknesses on silicon wafers were examined by atomic force microscopy, AFM, and transmission electron microscopy, TEM. Depending on the film thickness, PS-PVP copolymers showed cylindrical nanodomains with perpendicular, parallel, or intermediated orientation to the substrate. With a specific film thickness, however, perforated lamellae instead of cylinders were observed due to the strong affinity of PVP blocks to the substrate and the commensurability effect. PS and PVP homopolymers were incorporated into PS-PVP thin films to study the stability of perforated lamellae In addition, PS-PVP thin films on a hydrophobic silicon substrate was investigated to find formation of perforated lamellae. Nanostructures of PS-PVP thin films were also used as a nanotemplate to synthesize and arrange nanoparticles. Fig. 1. TEM image of perforated lamellae in thin films of PS-PVP diblock copolymers. PVP blocks (dark area) were stained with iodine. |
| 저자 | 진선희, 장교영, 손병혁 |
| 소속 | 서울대 |
| 키워드 | block copolymer; morphology |
