Polymeric Microcuboids Programmable for Temperature‐Memory,Macromolecular Materials and Engineering

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Polymeric Microcuboids Programmable for Temperature‐Memory
Macromolecular Materials and Engineering ( IF 4.2 ) Pub Date : 2020-08-12 , DOI: 10.1002/mame.202000333
Yue Liu ₁ , Oliver E.C. Gould ₁ , Tobias Rudolph ₁ , Liang Fang ₁ , Karl Kratz ₁ , Andreas Lendlein _{1,

2}

Affiliation

Microobjects with programmable mechanical functionality are highly desirable for the creation of flexible electronics, sensors, and microfluidic systems, where fabrication/programming and quantification methods are required to fully control and implement dynamic physical behavior. Here, programmable microcuboids with defined geometries are prepared by a template‐based method from crosslinked poly[ethylene‐co‐(vinyl acetate)] elastomers. These microobjects could be programmed to exhibit a temperature‐memory effect or a shape‐memory polymer actuation capability. Switching temperatures T_sw during shape recovery of 55 ± 2, 68 ± 2, 80 ± 2, and 86 ± 2 °C are achieved by tuning programming temperatures to 55, 70, 85, and 100 °C, respectively. Actuation is achieved with a reversible strain of 2.9 ± 0.2% to 6.7 ± 0.1%, whereby greater compression ratios and higher separation temperatures induce a more pronounced actuation. Micro‐geometry change is quantified using optical microscopy and atomic force microscopy. The realization and quantification of microparticles, capable of a tunable temperature responsive shape‐change or reversible actuation, represent a key development in the creation of soft microscale devices for drug delivery or microrobotics.

中文翻译：

可编程聚合物微立方，用于温度记忆

具有柔性机械功能的微对象对于创建柔性电子设备，传感器和微流体系统是非常需要的，在这些系统中，需要完全控制和实现动态物理行为的制造/编程和量化方法。在这里，具有确定几何形状的可编程微立方体是通过基于模板的方法由交联的聚[乙烯-共-（乙酸乙烯酯）]弹性体制备的。这些微对象可以被编程以表现出温度记忆效应或形状记忆聚合物致动能力。开关温度T _sw通过将编程温度分别调节到55、70、85和100°C，可以在形状恢复期间将55±2、68±2、80±2和86±2°C达到。通过2.9±0.2％到6.7±0.1％的可逆应变来实现致动，由此，更大的压缩比和更高的分离温度会引起更明显的致动。使用光学显微镜和原子力显微镜对微观几何变化进行量化。能够实现可调节的温度响应形状变化或可逆驱动的微粒的实现和定量，代表了创建用于药物输送或微机器人的软微型设备的关键发展。

更新日期：2020-10-12

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