Title: A Convenient Route to Prepare Reactive Azobenzene‐Containing Liquid Crystal Polymers and Photodeformable Fibers

Author: Yan Chen, Quan Liu, Patrick Theato, Jia Wei*, Yanlei Yu*

Journal: Adv. Intell. Syst., 2021, 3(10), 200054

Abstract:

Azobenzene‐containing liquid crystal polymers (azo‐LCPs) with reactive groups attract much attention due to the combined properties of liquid crystallinity, photoresponsivity and reactivity, which make them promising in designing intelligent photo‐driven soft actuators. Herein, a post‐polymerization modification strategy is used to prepare a series of reactive azo‐LCPs using the trans‐esterification reaction of poly(pentafluorophenyl acrylate) with functional alcohols. These reactive azo‐LCPs show good capabilities in fabricating fibers via a simple thermal‐drawing method and subsequent crosslinking reaction with diamine under mild conditions. Furthermore, the prepared fibers exhibit reversible deformation behaviors under the alternate irradiation of UV and visible light (365/530 nm). This facile synthetic strategy is expected to open up new possibilities for fabricating photo‐driven actuators.

论文链接：https://onlinelibrary.wiley.com/doi/10.1002/aisy.202000254

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本文利用含醇羟基的聚五氟苯基丙烯酸酯（PPFPA）的酯交换后聚合改性反应（PPM）为反应性偶氮苯液晶聚合物（azo-LCP）的合成提供了一种简便策略。由于PPFPA中的反应性五氟苯基(PFP)酯具有双重作用：1) 它可以被偶氮苯基团取代，赋予聚合物液晶和光响应性能，2)可以进一步与二胺反应生成交联聚合物网络，利用该方法合成的azo-LCP可在简单热拉伸和随后的交联中，简便制造出具有可逆弯曲行为的光致变形纤维。