Title: Regulating the Photodeformation Behavior of Azobenzene-Containing Polyimide via Thermal Treatment

Author: Menghan Zhang, Xuejie Sun, Jia Wei*, Yanlei Yu

Journal: ACS Appl. Polym. Mater. 2024, 6, 12261−12268

Abstract:

Photodeformable polymers have signiffcant potential for untethered smart actuation due to their rapid response and versatile deformation behaviors. However, altering deformation behaviors typically requires preparing materials with different macromolecular structures. Here, we achieved controllable reversal of photodeformation behaviors (bending away from or toward the light source) in side-chain azobenzene polyimides by adjusting the thermal treatment conditions. Different thermal treatments introduced variations in the internal free volume of the material, leading to two distinct deformation mechanisms under blue light exposure and resulting in opposite macroscopic deformation behaviors. By choosing appropriate thermal treatment methods, we fabricated actuators with speciffc functionalities and utilized the correlation between deformation behavior and thermal treatment to demonstrate a detector for thermal history. This postsynthesis regulation of the photodeformation behavior offers a convenient and repeatable manner to engineer actuation on demand.

论文链接：https://pubs.acs.org/doi/10.1021/acsapm.4c02399?ref=PDF

PDF下载：Regulating the Photodeformation Behavior of Azobenzene-Containing Polyimide via Thermal Treatment.pdf

光致形变高分子材料因其快速响应和多样的变形行为，在远程驱动方面具有显著潜力。然而，为了获得不同的形变行为，通常需要制备不同结构的高分子材料。在本研究中，我们通过调整侧链偶氮苯聚酰亚胺多的热处理条件，实现光致形变行为的可控翻转（远离或朝向光源的弯曲）。不同的热处理过程引起材料内部自由体积的变化，导致在蓝光照射下产生两种不同的宏观形变行为。通过选择合适的热处理方法，我们制造了具有特定功能的驱动器，并利用变形行为与热处理之间的关系，展示了一种热历史记录器。这种利用热处理调控光致形变行为的方法为按需设计驱动模式提供了一种便捷途径。