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Sequential Motion of 4D Printed Photopolymers with Broad Glass Transition
Macromolecular Materials and Engineering ( IF 3.9 ) Pub Date : 2019-12-12 , DOI: 10.1002/mame.201900370
Nicoletta Inverardi 1 , Stefano Pandini 1 , Fabio Bignotti 1 , Giulia Scalet 2 , Stefania Marconi 2 , Ferdinando Auricchio 2
Affiliation  

The term “4D printing” refers to the development of stimulus‐responsive structures through 3D printing of active smart materials, typically shape memory polymers. A noteworthy aim of this research field is to obtain objects able to display complex shape‐shifting motions, such as sequential transformations over time. In this work, this peculiar response is studied on a commercial photopolymer, printed by stereolithography and featuring, on the basis of its inherent broad glass transition, the so‐called “temperature‐memory effect” (TME). The TME, that is, a response in which the shape memory effect occurs on a region controlled by the deformation temperature, is studied in shape memory cycles where the deformation temperature is systematically varied, so to provide a correlation between deformation and recovery temperatures. This also allows to properly select two temperatures at which deforming a specimen along a multistep history, so as to finally separate each recovery process on the temperature and time scales. This sequential recovery is studied in double folded bars, with arms deformed at different temperatures, and on a properly designed self‐locking clamp. The obtained results are promising for the realization of smart temperature‐responsive structures printed with one single polymer and capable of multiple shape transformations.

中文翻译:

具有宽玻璃化转变的4D打印光敏聚合物的顺序运动

术语“ 4D打印”是指通过主动智能材料(通常是形状记忆聚合物)的3D打印来开发刺激响应结构。该研究领域的一个值得注意的目标是获得能够显示复杂的形变运动的对象,例如随着时间的顺序变换。在这项工作中,这种特殊的响应是在商业光敏聚合物上进行的,该光敏聚合物通过立体平版印刷术进行印刷,并基于其固有的宽玻璃化转变,具有所谓的“温度记忆效应”(TME)。在变形温度被系统地改变的形状记忆周期中,研究了TME,即在变形温度控制的区域中发生形状记忆效应的响应,从而提供了变形温度与恢复温度之间的相关性。这还允许正确选择两个温度,使样品沿着多步历史变形,从而最终在温度和时间范围内分离每个恢复过程。在双折叠杆中研究了这种顺序恢复,在不同温度下臂会变形,并使用适当设计的自锁夹钳。所获得的结果有望实现用一种聚合物印刷的智能温度响应结构,并能够进行多种形状转换。
更新日期:2020-01-15
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