当前位置: X-MOL 学术Soft Matter › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Cumulative energy analysis of thermally-induced surface wrinkling of heterogeneously multilayered thin films†
Soft Matter ( IF 3.4 ) Pub Date : 2017-12-18 00:00:00 , DOI: 10.1039/c7sm02027a
Seong Soo Yoo 1, 2, 3, 4 , Gwan H. Choi 1, 2, 3, 4 , Wooseop Lee 4, 5, 6, 7 , Juhyun Park 4, 8, 9, 10 , Gi-Ra Yi 1, 2, 3, 4 , Du Yeol Ryu 4, 5, 6, 7 , Pil J. Yoo 1, 2, 3, 4, 11
Affiliation  

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.

中文翻译:

异质多层薄膜热诱导表面起皱的累积能量分析

起皱是不稳定性驱动的表面变形的众所周知的例子,当多层系统中累积的压缩应力超过临界值时,会发生皱纹。许多研究已经研究了不稳定性条件和起皱变形的相应机理。双层系统的力平衡分析,其中重要考虑了覆盖层的厚度,为定量了解皱纹提供了一种有用的方法。但是,这种方法不适用于由异质材料组成的多层起皱(层数> 3)(例如聚合物/金属或无机材料),其中基材的厚度变化也很关键。因此,为了适应多层系统的累加特性,我们对聚合物/金属多层的三层或四层样品进行了热处理,以产生表面皱纹,并使用累积能量平衡分析来考虑每个组成层的个体贡献。与复合层模型不同,在复合层模型中,对于异质堆叠的多层,覆盖层的厚度效应被高估了,我们的方法精确地反映了给定多层系统的弯曲能贡献,其结果与实验值非常吻合。此外,
更新日期:2017-12-18
down
wechat
bug