Digital Light Process 3D Printing of Magnetically Aligned Liquid Crystalline Elastomer Free-forms.

IF 27.4 1区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Jeremy A Herman, Rodrigo Telles, Caitlyn C Cook, Samuel C Leguizamon, Jennifer A Lewis, Bryan Kaehr, Timothy J White, Devin J Roach
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Abstract

Liquid crystalline elastomers (LCEs) are anisotropic soft materials capable of large dimensional changes when subjected to a stimulus. The magnitude and directionality of the stimuli-induced thermomechanical response is associated with the alignment of the LCE. Recent reports detail the preparation of LCEs by additive manufacturing (AM) techniques, predominately using direct ink write printing. Another AM technique, digital light process (DLP) 3D printing, has generated significant interest as it affords LCE free-forms with high fidelity and resolution. However, one challenge of printing LCEs using vat polymerization methods such as DLP is enforcing alignment. Here, we document the preparation of aligned, main-chain LCEs via DLP 3D printing using a 100 mT magnetic field. Systematic examination isolates the contribution of magnetic field strength, alignment time, and build layer thickness on the degree of orientation in 3D printed LCEs. Informed by this fundamental understanding, DLP is used to print complex LCE free-forms with through-thickness variation in both spatial orientations. The hierarchical variation in spatial orientation within LCE free-forms is used to produce objects that exhibit mechanical instabilities upon heating. DLP printing of aligned LCEs opens new opportunities to fabricate stimuli-responsive materials in form factors optimized for functional use in soft robotics and energy absorption.

Abstract Image

磁性排列液晶弹性体自由形态的数字光工艺三维打印。
液晶弹性体(LCE)是一种各向异性的软材料,在受到刺激时能够产生较大的尺寸变化。刺激引起的热机械响应的大小和方向性与 LCE 的排列有关。最近的报告详细介绍了通过增材制造(AM)技术制备 LCE 的情况,主要是使用直接墨水写入打印技术。另一种增材制造技术--数字光处理(DLP)三维打印技术也引起了人们的极大兴趣,因为它能提供高保真、高分辨率的 LCE 自由形态。然而,使用大桶聚合方法(如 DLP)打印 LCE 所面临的一个挑战是如何实现对齐。在此,我们记录了使用 100 mT 磁场通过 DLP 三维打印制备对齐的主链 LCE 的过程。通过系统检查,我们发现磁场强度、配向时间和构建层厚度对三维打印 LCE 的配向程度都有影响。在这一基本认识的指导下,DLP 被用于打印复杂的 LCE 自由形态,其两个空间方向的厚度均有变化。LCE 自由形态中空间取向的分层变化用于制造在加热时表现出机械不稳定性的物体。对齐 LCE 的 DLP 打印为制造刺激响应材料提供了新的机会,这些材料的外形经过优化,可用于软机器人和能量吸收等功能。
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来源期刊
Advanced Materials
Advanced Materials 工程技术-材料科学:综合
CiteScore
43.00
自引率
4.10%
发文量
2182
审稿时长
2 months
期刊介绍: Advanced Materials, one of the world's most prestigious journals and the foundation of the Advanced portfolio, is the home of choice for best-in-class materials science for more than 30 years. Following this fast-growing and interdisciplinary field, we are considering and publishing the most important discoveries on any and all materials from materials scientists, chemists, physicists, engineers as well as health and life scientists and bringing you the latest results and trends in modern materials-related research every week.
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