Mechanical Properties of Ultrathin Polystyrene-b-Polybutadiene-b-Polystyrene Block Copolymer Films: Film Thickness-Dependent Young’s Modulus,Macromolecules

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Mechanical Properties of Ultrathin Polystyrene-b-Polybutadiene-b-Polystyrene Block Copolymer Films: Film Thickness-Dependent Young’s Modulus
Macromolecules ( IF 5.1 ) Pub Date : 2021-09-14 , DOI: 10.1021/acs.macromol.1c01406
Masayuki Saito ₁ , Kohzo Ito ₁ , Hideaki Yokoyama ₁

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This study investigated the mechanical properties of ultrathin polystyrene-b-polybutadiene-b-polystyrene (SBS) block copolymer films with thicknesses ranging from 20 to 600 nm using a pseudo-free-standing tensile test carried out using an ultrathin film floating on water. The Young’s moduli of ultrathin SBS films increased drastically with decreasing thickness for films thinner than 100 nm, i.e., 2 or 3 times the domain spacing of the SBS. We analyzed the depth profiles of the polystyrene (PS) domain in the SBS thin films by dynamic secondary ion mass spectrometry and the surface and interface in-plane morphology using atomic force microscopy. The PS-rich continuous subsurface layer was observed to be a major factor for the drastic increase in Young’s modulus under ultrathin film conditions. Therefore, we propose a simple two-layer model consisting of a hard PS-rich layer and a soft bulk layer to explain the specific increase in Young’s modulus with decreasing film thickness.

中文翻译：

超薄聚苯乙烯-b-聚丁二烯-b-聚苯乙烯嵌段共聚物薄膜的机械性能：取决于薄膜厚度的杨氏模量

本研究调查了超薄聚苯乙烯-b-聚丁二烯-b的机械性能- 聚苯乙烯 (SBS) 嵌段共聚物薄膜，厚度范围为 20 至 600 nm，使用漂浮在水面上的超薄膜进行拟自立拉伸试验。超薄 SBS 薄膜的杨氏模量随着薄膜厚度的减小而急剧增加，厚度小于 100 nm，即 SBS 域间距的 2 或 3 倍。我们通过动态二次离子质谱法分析了 SBS 薄膜中聚苯乙烯 (PS) 域的深度分布，并使用原子力显微镜分析了表面和界面的面内形态。观察到富含 PS 的连续次表面层是超薄膜条件下杨氏模量急剧增加的主要因素。所以，

更新日期：2021-09-28

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