Title: Photodeformable Azobenzene-Containing Polyimide with Flexible Linkers and Molecular Alignment

Author: Panpan Zhang, Zhongxu Lan, Jia Wei*, Yanlei Yu*

Journal: ACS Macro Lett., 2021, 10(4), 469-475

Abstract:

Azobenzene-containing polyimides (azo-PIs) as photodeformable materials have attracted scientific attention in view of combining photoresponse and high performance (such as excellent mechanical and thermal properties). In the previously reported photodeformation of azo-PIs, polarized blue–green light was utilized to produce concerted motion of azobenzene moieties based on the mechanism of photoinduced reorientation. Herein, we explored a designed azo-PI undergoing photodeformation upon unpolarized light irradiation. The azo-PI film aligned by the hot-stretching process exhibited fast and reversible bending behavior under alternate ultraviolet (UV) and visible (vis) light irradiation, indicating the efficient nano-to-macroscopic propagation of molecular deformation of azobenzene. Besides, the aligned azo-PI film even bent in hot water (80 °C) and hot silicone oil (100 and 120 °C) with UV light irradiation.

论文链接：https://pubs.acs.org/doi/abs/10.1021/acsmacrolett.1c00040

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本文将具有柔性链且含偶氮苯的二胺单体（DAC3AB）与六氟二酐（6FDA）共聚，制备了可热拉伸来排列液晶取向的偶氮苯-聚酰亚胺（azo-PI）薄膜。该薄膜可在非偏振光（交替的紫外线和可见光）照射下表现出快速可逆的弯曲行为，同时其在紫外线照射下还可在热水（80 ℃）和热硅油（100 ℃/120 ℃）中弯曲。