原位可控构建分级超分子手性液晶聚合物组装体。
In Situ Controlled Construction of a Hierarchical Supramolecular Chiral Liquid-Crystalline Polymer Assembly.
作者信息
Cheng Xiaoxiao, Miao Tengfei, Yin Lu, Ji Yujin, Li Youyong, Zhang Zhengbiao, Zhang Wei, Zhu Xiulin
机构信息
State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials, Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, China.
Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou, 215123, China.
出版信息
Angew Chem Int Ed Engl. 2020 Jun 8;59(24):9669-9677. doi: 10.1002/anie.202001657. Epub 2020 Apr 1.
Hierarchical supramolecular chiral liquid-crystalline (LC) polymer assemblies are challenging to construct in situ in a controlled manner. Now, polymerization-induced chiral self-assembly (PICSA) is reported. Hierarchical supramolecular chiral azobenzene-containing block copolymer (Azo-BCP) assemblies were constructed with π-π stacking interactions occurring in the layered structure of Azo smectic phases. The evolution of chirality from terminal alkyl chain to Azo mesogen building blocks and further induction of supramolecular chirality in LC BCP assemblies during PICSA is achieved. Morphologies such as spheres, worms, helical fibers, lamellae, and vesicles were observed. The morphological transition had a crucial effect on the chiral expression of Azo-BCP assemblies. The supramolecular chirality of Azo-BCP assemblies destroyed by 365 nm UV irradiation can be recovered by heating-cooling treatment; this dynamic reversible achiral-chiral switching can be repeated at least five times.
以可控方式原位构建分层超分子手性液晶（LC）聚合物组装体具有挑战性。现在，有报道称聚合诱导手性自组装（PICSA）。通过在偶氮近晶相的层状结构中发生的π-π堆积相互作用，构建了分层超分子手性含偶氮苯的嵌段共聚物（Azo-BCP）组装体。在PICSA过程中，实现了从末端烷基链到手性偶氮介晶结构单元的手性演化，以及在LC BCP组装体中进一步诱导超分子手性。观察到了诸如球体、蠕虫、螺旋纤维、薄片和囊泡等形态。形态转变对Azo-BCP组装体的手性表达有至关重要的影响。被365 nm紫外线照射破坏的Azo-BCP组装体的超分子手性可通过加热-冷却处理恢复；这种动态可逆的非手性-手性切换至少可重复五次。
Zotero 插件