Self-folding of polymer sheets using local light absorption
Self-folding of polymer sheets using local light absorption
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DOI：
10.1039/c1sm06564e
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发表时间：
2012-01-01
期刊：
影响因子：
3.4
通讯作者：
Dickey, Michael D.
中科院分区：
文献类型：
--
作者：
Liu, Ying;Boyles, Julie K.;Dickey, Michael D.
本文演示了实验和计算模型的一种新的和简单的方法，使用非聚焦光的聚合物薄片的自折叠。这些片材由光学透明的预应变聚苯乙烯（也称为Shrinky-Dinks）制成，如果均匀加热，它们会在平面内收缩。聚合物片两侧的黑色墨水图案提供局部光吸收，从而将底层聚合物加热至高于其玻璃化转变的温度。在这些温度下，预定义的着墨区域（即，铰链）松弛和收缩，从而使平面片折叠成三维物体。因此，自折叠以简单的方式实现，而不使用多个制造步骤，并将均匀的外部刺激（即，未聚焦的光）在其它组成均匀的衬底上形成铰接响应。建模有效地捕捉实验的折叠趋势作为铰链宽度和支持温度的函数，并建议铰链区域必须超过折叠发生的片材的玻璃化转变温度。
This paper demonstrates experimentally and models computationally a novel and simple approach for self-folding of thin sheets of polymer using unfocused light. The sheets are made of optically transparent, pre-strained polystyrene (also known as Shrinky-Dinks) that shrink in-plane if heated uniformly. Black ink patterned on either side of the polymer sheet provides localized absorption of light, which heats the underlying polymer to temperatures above its glass transition. At these temperatures, the predefined inked regions (i.e., hinges) relax and shrink, and thereby cause the planar sheet to fold into a three-dimensional object. Self-folding is therefore achieved in a simple manner without the use of multiple fabrication steps and converts a uniform external stimulus (i.e., unfocused light) on an otherwise compositionally homogenous substrate into a hinging response. Modeling captures effectively the experimental folding trends as a function of the hinge width and support temperature and suggests that the hinged region must exceed the glass transition temperature of the sheet for folding to occur.