| 학회 |
한국화학공학회 |
| 학술대회 |
2015년 가을 (10/21 ~ 10/23, 일산 KINTEX) |
| 권호 |
21권 2호, p.1433 |
| 발표분야 |
고분자 |
| 제목 |
Structural Change in Buckling Depending on the Directional Mechanical Heterogeneity of Top Thin Films |
| 초록 |
Buckling of thin films placed on elastomeric substrates is the well-known phenomenon in buckling instability originating from the moduli mismatch between a substrate and a thin film placed on top. Recently, many studies on the microstructures created by the buckling with flat top films have been reported and the physics behind them has been well understood. However, almost none has been done for the buckling structure with micropatterned top films and the buckling mechanics for patterned top film-PDMS (polydimethylsiloxane) bilayers thus has not yet been studied in detail. Here, we present the buckling of mechanically heterogeneous, patterned top films placed on top of elastomeric substrates. Mechanically heterogeneous top films were prepared by polystyrene (PS) films with topographic patterns. Buckling instability was induced by applying mechanical stresses to the PS-PDMS bilayers. Resulting buckling structure showed the structural change depending on the alignment of the top films with respect to the buckling direction. The hierarchical structural change was modeled using a beam theory, showing good agreement with experimental results obtained. |
| 저자 |
차국헌1, 서효선2, 윤현식3, 권도경1
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| 소속 |
1서울대, 2Univ. of Chicago, 3서울과학기술대 |
| 키워드 |
Buckling Instability; Topographical Pattern; Mechanical Heterogeniety; Hierarchical Structure
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| E-Mail |
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| 원문파일 |
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