| 학회 |
한국고분자학회 |
| 학술대회 |
2009년 가을 (10/08 ~ 10/09, 광주과학기술원 오룡관) |
| 권호 |
34권 2호 |
| 발표분야 |
고분자 나노 구조물의 합성, 분석 및 응용(국제심포지움) |
| 제목 |
Order-order Transitions in ABC Triblock Copolymer Film Induced by Saturated Solvent Vapor |
| 초록 |
We report observation of the order-order transition (OOT) in the sequence of hexagonally-arranged core-shell cylinder and double-hexagonally-arranged-dots in poly(styrene)-b-poly(butadiene)-b-poly(2-vinylpyridine) (SBV) triblock copolymer thin film induced by strongly selective solvent vapor for two end blocks. Those two kinds of hexagonally arranged structures could form when the film thickness is 44 nm, 123 nm and 223 nm. While when the film thickness decreased to 13 nm, the ordered structure is absent. The sizes of the core-shell cylinder structures at the same annealing time scale in different film thickness are compared to address the effects of film thickness on the phase structure. The mechanism is analyzed from the total surface area of the blocks and the effective interaction parameter in the solvent vapor. The morphology transition of the thin film of SBV in benzene vapor showing slightly selectivity for PS at room temperature is investigated. The OOT in the sequence of core-shell cylinders (C), sphere in ‘diblock gyroid’ (sdG), sphere in lamella (sL) and sphere (S) are observed. The projection along (111) direction in Gyroid phase (sdG(111)) is found to epitaxially grow from C(001) in the film. Instead of sdG(111), sdG(110)0.1875 develops to the phase of sL. Consequently, the film experiences the transition sequence of sdG(111)→sdG(211)→sdG(110)0.25→sdG(110)0.1875 between C and sL. The mechanism is analyzed from the total surface area of the blocks. |
| 저자 |
Luochun Xia, Yanchun Han
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| 소속 |
Changchun Institute of Applied Chemistry Chinese Academy of Sciences |
| 키워드 |
triblock copolymer; order-order transition; hexagonally arranged structures
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| E-Mail |
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