Cumulative energy analysis of thermally-induced surface wrinkling of heterogeneously multilayered thin films

被引:12
|
作者
Yoo, Seong Soo [1 ]
Choi, Gwan H. [1 ]
Lee, Wooseop [2 ]
Park, Juhyun [3 ]
Yi, Gi-Ra [1 ]
Ryu, Du Yeol [2 ]
Yoo, Pil J. [1 ,4 ]
机构
[1] Sungkyunkwan Univ SKKU, Sch Chem Engn, Suwon 16419, South Korea
[2] Yonsei Univ, Dept Chem & Biomol Engn, Seoul 03722, South Korea
[3] Chung Ang Univ, Sch Chem Engn & Mat Sci, Seoul 06974, South Korea
[4] Sungkyunkwan Univ SKKU, SKKU Adv Inst Nanotechnol SAINT, Suwon 16419, South Korea
关键词
LIQUID-CRYSTALLINE POLYMER; ORDERED STRUCTURES; ELASTIC-MODULI; CROSS-LINKING; PATTERNS; POLYDIMETHYLSILOXANE; CONFINEMENT; INSTABILITY; BILAYER; COMPLEX;
D O I
10.1039/c7sm02027a
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Wrinkling is a well-known example of instability-driven surface deformation that occurs when the accumulated compressive stress exceeds the critical value in multilayered systems. A number of studies have investigated the instability conditions and the corresponding mechanisms of wrinkling deformation. Force balance analysis of bilayer systems, in which the thickness of the capping layer is importantly considered, has offered a useful approach for the quantitative understanding of wrinkling. However, it is inappropriate for multilayer wrinkling (layer number > 3) consisting of heterogeneous materials (e.g. polymer/metal or inorganic), in which the thickness variation in the substrate is also crucial. Therefore, to accommodate the additive characteristics of multilayered systems, we thermally treated tri- or quad-layer samples of polymer/metal multilayers to generate surface wrinkles and used a cumulative energy balance analysis to consider the individual contribution of each constituent layer. Unlike the composite layer model, wherein the thickness effect of the capping layer is highly overestimated for heterogenously stacked multilayers, our approach precisely reflects the bending energy contribution of the given multilayer system, with results that match well with experimental values. Furthermore, we demonstrate the feasibility of this approach as a metrological tool for simple and straightforward estimation of the thermomechanical properties of polymers, whereby a delicate change in the Young's modulus of a thin polymeric layer near its glass transition temperature can be successfully monitored.
引用
收藏
页码:704 / 710
页数:7
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