Stretching and Bending Moduli of Bilayer Films Inferred from Wrinkle Patterns

IF 5.1 1区化学 Q1 POLYMER SCIENCE Macromolecules Pub Date : 2024-10-23 DOI:10.1021/acs.macromol.4c01540

Jooyoung Chang, Narayanan Menon, Thomas P. Russell

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Abstract

Wrinkling patterns were used to investigate the mechanical properties of thin poly(styrene) (PS)/poly(methyl methacrylate) (PMMA) and PS/gold (Au) bilayer films. Films were floated on water with a water drop on the surface to induce wrinkling. The thicknesses and thickness ratios of the films were varied over a broad range. The PS/PMMA bilayer was chosen to provide a contrast in wetting properties, with equilibrium contact angles of θ_PMMA = 68° and θ_PS = 88° with water. The PS/Au bilayer was chosen to provide a large contrast in Young’s moduli, E_Au = 72 GPa and E_PS = 3.4 GPa. The stretching (Y) and bending (B) moduli of the bilayer films were obtained from measurements of the length and number of wrinkles in the wrinkle patterns. The experimentally derived values of Y and B were in reasonable agreement with the values computed from the bulk Young’s moduli and the thicknesses of the two components in the bilayer. The values of Y and B did not depend on which face of the film was exposed to the water droplet or bath when the capillary stresses were considered. Thus, finite size effects from the film thicknesses were unimportant over the range of thicknesses studied, and no relative displacement of the films was found, with the films remaining well-bonded even with deformation associated with wrinkling.

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从皱纹图案推断双层薄膜的拉伸和弯曲模量

皱纹图案用于研究聚苯乙烯（PS）/聚甲基丙烯酸甲酯（PMMA）和聚苯乙烯/金（Au）双层薄膜的机械特性。薄膜漂浮在水面上，表面上有水滴诱发起皱。薄膜的厚度和厚度比在很大范围内变化。选择 PS/PMMA 双层膜是为了提供润湿性能的对比，其与水的平衡接触角分别为 θPMMA = 68° 和 θPS = 88°。选择 PS/Au 双层膜是为了提供较大的杨氏模量对比：EAu = 72 GPa 和 EPS = 3.4 GPa。双层薄膜的拉伸（Y）和弯曲（B）模量是通过测量皱纹图案中皱纹的长度和数量获得的。实验得出的 Y 值和 B 值与根据双层膜中两种成分的体杨氏模量和厚度计算得出的值基本一致。在考虑毛细应力时，Y 和 B 的值并不取决于薄膜的哪一面暴露在水滴或水浴中。因此，在所研究的薄膜厚度范围内，薄膜厚度的有限尺寸效应并不重要，也没有发现薄膜的相对位移，即使发生与起皱有关的变形，薄膜也能保持良好的粘结性。

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来源期刊

Macromolecules 工程技术-高分子科学

CiteScore

9.30

自引率

16.40%

发文量

942

审稿时长

2 months

期刊介绍： Macromolecules publishes original, fundamental, and impactful research on all aspects of polymer science. Topics of interest include synthesis (e.g., controlled polymerizations, polymerization catalysis, post polymerization modification, new monomer structures and polymer architectures, and polymerization mechanisms/kinetics analysis); phase behavior, thermodynamics, dynamic, and ordering/disordering phenomena (e.g., self-assembly, gelation, crystallization, solution/melt/solid-state characteristics); structure and properties (e.g., mechanical and rheological properties, surface/interfacial characteristics, electronic and transport properties); new state of the art characterization (e.g., spectroscopy, scattering, microscopy, rheology), simulation (e.g., Monte Carlo, molecular dynamics, multi-scale/coarse-grained modeling), and theoretical methods. Renewable/sustainable polymers, polymer networks, responsive polymers, electro-, magneto- and opto-active macromolecules, inorganic polymers, charge-transporting polymers (ion-containing, semiconducting, and conducting), nanostructured polymers, and polymer composites are also of interest. Typical papers published in Macromolecules showcase important and innovative concepts, experimental methods/observations, and theoretical/computational approaches that demonstrate a fundamental advance in the understanding of polymers.