Multimaterial 4D Printing with Tailorable Shape Memory Polymers.
Multimaterial 4D Printing with Tailorable Shape Memory Polymers.
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DOI：
10.1038/srep31110
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发表时间：
2016-08-08
影响因子：
4.6
通讯作者：
Dunn ML
中科院分区：
文献类型：
--
作者：
Ge Q;Sakhaei AH;Lee H;Dunn CK;Fang NX;Dunn ML
我们提出了一种新的4D打印方法，可以创建高分辨率（高达几微米），多材料形状记忆聚合物（SMP）架构。该方法基于高分辨率投影微立体光刻技术（PμSL），并使用一系列可光固化的甲基丙烯酸酯基共聚物网络。我们设计的成分和成分表现出所需的热力学行为（包括橡胶模量，玻璃化转变温度和失效应变超过300%，大于任何现有的可打印材料），以实现可控的形状记忆行为。我们使用高分辨率，高对比度的数字微显示器来确保光固化甲基丙烯酸酯基smp的高分辨率，这需要比更常见的丙烯酸酯基聚合物更高的曝光能量。自动化的材料交换过程使多个光固化smp能够制造3D复合结构。为了了解三维复合材料微结构的行为，我们对其复杂的非线性、随时间变化的行为进行了高保真的计算模拟，并研究了重要的设计考虑因素，包括局部变形、形状固定性和自由回复率。对一系列单材料和多材料构件的仿真结果与实验结果吻合较好，可用于SMP三维结构的设计。
We present a new 4D printing approach that can create high resolution (up to a few microns), multimaterial shape memory polymer (SMP) architectures. The approach is based on high resolution projection microstereolithography (PμSL) and uses a family of photo-curable methacrylate based copolymer networks. We designed the constituents and compositions to exhibit desired thermomechanical behavior (including rubbery modulus, glass transition temperature and failure strain which is more than 300% and larger than any existing printable materials) to enable controlled shape memory behavior. We used a high resolution, high contrast digital micro display to ensure high resolution of photo-curing methacrylate based SMPs that requires higher exposure energy than more common acrylate based polymers. An automated material exchange process enables the manufacture of 3D composite architectures from multiple photo-curable SMPs. In order to understand the behavior of the 3D composite microarchitectures, we carry out high fidelity computational simulations of their complex nonlinear, time-dependent behavior and study important design considerations including local deformation, shape fixity and free recovery rate. Simulations are in good agreement with experiments for a series of single and multimaterial components and can be used to facilitate the design of SMP 3D structures.