Epitaxial phase transition of polystyrene-b-polyisoprene from hexagonally perforated layer to gyroid phase in thin film
SCIE
SCOPUS
- Title
- Epitaxial phase transition of polystyrene-b-polyisoprene from hexagonally perforated layer to gyroid phase in thin film
- Authors
- Park, I; Lee, B; Ryu, J; Im, K; Yoon, J; Ree, M; Chang, T
- Date Issued
- 2005-12-13
- Publisher
- AMER CHEMICAL SOC
- Abstract
- We investigated the phase transition behavior from the hexagonally perforated layer (HPL) to the gyroid (G) phase in supported thin film of a polystyrene-b-polyisoprene (PS-b-PI) diblock copolymer (M = 34.0 kg/mol, wtp, = 0.634) by grazing-incidence small-angle X-ray scattering. After annealing at 120 'C, the PS-b-Pl thin film spin-coated on silicon wafer exhibited HPL morphology with its lamellae highly oriented parallel to the substrate up to a thickness as much as 1 um. The interface-induced orientation allowed us to obtain a well-developed diff-raction pattern in the absence of external mechanical strain to align the domains. The comparison with the computer-simulated diffraction pattern revealed that the HPL structure has mosaic grains oriented randomly in-plane with ABC stacking and undetectable amount of AB stacking. Upon heating, the HPL phase undergoes a phase transition to the G phase. The phase transition occurred epitaxially converting the HPL layers to the {1211 planes of the G structure maintaining the G 11211 plane oriented parallel to the substrate. This behavior is in contrast with the HPL to G -phase transition found from the shear-oriented HPL samples, in which the G 11211 plane is randomly oriented around the G [ill] axis.
- Keywords
- X-RAY-SCATTERING; DIBLOCK COPOLYMER; ANIONIC-POLYMERIZATION; DIAGRAM; MELTS
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/24278
- DOI
- 10.1021/MA051137I
- ISSN
- 0024-9297
- Article Type
- Article
- Citation
- MACROMOLECULES, vol. 38, no. 25, page. 10532 - 10536, 2005-12-13
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- There are no files associated with this item.
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