Stiff or Extensible in Seconds: Light‐Induced Corrugations in Thin Polymer Sheets,Advanced Materials Technologies

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Stiff or Extensible in Seconds: Light‐Induced Corrugations in Thin Polymer Sheets
Advanced Materials Technologies ( IF 6.4 ) Pub Date : 2020-11-20 , DOI: 10.1002/admt.202000789
Amber M. Hubbard ₁ , Jay Kalpesh Patel ₁ , Sigurd Wagner ₂ , Chih‐Hao Chang ₃ , Jan Genzer ₁ , Michael D. Dickey ₁

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Corrugations can dramatically change the effective mechanical properties of a thin sheet. Such alternating ridges and grooves are typically fabricated by mechanical processing. Herein, the ability to trigger and tune corrugations within thin (≈300 µm thick) thermoplastic sheets rapidly (≈seconds) using only light is reported. Patterns of black ink on the otherwise transparent, flimsy sheet preferentially adsorb external IR light, inducing localized heating of the underlying polymer. This heating causes localized shrinkage of the polymer, producing folds in the sheets; collectively, these folds result in corrugations of controlled geometry. Depending on orientation, these corrugations dramatically increase stiffness or extensibility, similar to corrugated roofs (stiff) or accordions (extensible). In the direction parallel to the folds, the maximum load‐carrying capacity increases by two orders of magnitude relative to the non‐corrugated sheet; perpendicular to the folds, the effective modulus decreases by four orders of magnitude. In addition to tuning effective mechanical properties, the ability to corrugate flat surfaces using light has implications for assembling 3D objects from substrates printed in 2D (such as lithographically patterned electronics) or 3D structures shipped in a flat state. Herein, the process of forming such structures is discussed and their properties are characterized.

中文翻译：

几秒钟内变硬或可伸长：聚合物薄板中的光诱导波纹

波纹可以极大地改变薄片的有效机械性能。这样的交替的脊和凹槽通常通过机械加工来制造。这里，能力薄内触发并调整波纹（≈ 300 μ厚）的热塑性片材迅速（≈秒钟）报告仅使用光。在原本透明的脆弱薄片上的黑色墨水图案优先吸收外部IR光，从而引起下层聚合物的局部加热。这种加热导致聚合物局部收缩，从而在片材中产生折叠。这些褶皱共同导致几何形状可控的波纹。根据方向的不同，这些波纹可以显着增加刚度或可扩展性，类似于瓦楞屋顶（硬）或手风琴（可扩展）。在平行于折痕的方向上，最大承载能力相对于非瓦楞纸增加了两个数量级。垂直于折痕，有效模量降低四个数量级。除了调整有效的机械性能外，利用光使平坦的表面起皱的能力对于从以2D形式印刷的基板（例如光刻图案化的电子产品）或以平坦状态运输的3D结构中组装3D对象具有影响。在此，讨论了形成这种结构的过程并表征了它们的特性。

更新日期：2021-01-05

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