| 학회 |
한국화학공학회 |
| 학술대회 |
2017년 봄 (04/26 ~ 04/28, ICC 제주) |
| 권호 |
23권 1호, p.3 |
| 발표분야 |
고분자 |
| 제목 |
Evaporation Rate Dependent Evolution of Shape and Morphology of Uniform-Sized Block Copolymer Particles |
| 초록 |
Shape and morphology of polymeric particles are of great importance in controlling their functionality. Confinement of block copolymers (BCPs) in evaporative emulsions affords particles with diverse structures, including prolate and oblate spheroids, onion-like spheres, and others. Herein, we report that the evaporation rate of solvent from emulsions encapsulating symmetric polystyrene-b-polybutadiene (PS-b-PB) determines the shape and internal nanostructure of BCP particles. A distinct morphological transition from the ellipsoids with striped lamellae to the onion-like spheres was observed with decreasing evaporation rate. Differences in the solvent diffusion rates in PS and PB at rapid evaporation rates induced alignment of both domains perpendicular to the particle surface, resulting in ellipsoids with axial lamellar stripes. Slower evaporation rates provided sufficient time for BCP organization into onion-like structures with PB as the outermost layer, owing to the preferential interaction of PB with the surrounding. BCP molecular weight was found to influence the critical evaporation rate corresponding to the morphological transition from ellipsoid to onion-like particles. |
| 저자 |
신재만1, 김용주1, 윤홍석1, 이기라2, 김범준1
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| 소속 |
1KAIST, 2성균관대 |
| 키워드 |
고분자가공 |
| E-Mail |
|
| VOD |
VOD 보기 |
| 원문파일 |
초록 보기 |
