| 학회 |
한국고분자학회 |
| 학술대회 |
2004년 봄 (04/09 ~ 04/10, 고려대학교) |
| 권호 |
29권 1호, p.55 |
| 발표분야 |
고분자 구조 및 물성 |
| 제목 |
Universal Scaling Relationship for Liquid/Liquid Dewetting |
| 초록 |
The dewetting kinetics of poly(2-vinylpyridine) (PVP) overlayers (A) on top of immiscible polystyrene (PS) substrates (B) is investigated by controlling the viscosity ratio of the two polymer layers. For a viscosity ratio smaller than 1 (ηA/ηB < 1), the polymer underlayer acts like an elastic solid, as previously reported. In contrast, for ηA/ηB > 1, the PS melt underlayer can be readily deformed, as verified from the interface profile measured with AFM, and the viscous deformation in the PS underlayer influences the dewetting kinetics of the upper PVP layer. The dewetting of the PVP overlayer on the PS underlayer occurs by a nucleation and growth process of holes in the PVP layer that are surrounded by a PVP rim, regardless of the viscosity ratio. Mass conservation leads to a universal scaling relationship (the rim height (h) multiplied with the rim width (w) scales with the dewetted hole diameter (D) as D1) that describes the experimental data. On the less viscous PS underlayers, h initially increases more rapidly with D than on more viscous PS ones, a result that is due to a ring-like hump that develops in the PS just outside the hole in response to the interfacial tensions at the three phase contact line. |
| 저자 |
강희만1, 이승헌2, 차국헌1, Edward J. Kramer3
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| 소속 |
1서울대, 2LG 화학, 3Materials Research Laboratory |
| 키워드 |
Liquid/Liquid Dewetting; Nucleation and Growth; Viscosity Ratio; Mass Conservation; Interfacial Tension
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| E-Mail |
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