基于活性阴离子聚合的偶氮联苯基侧链型液晶高分子可控设计合成

偶氮联苯基（Azo）液晶高分子具有独特的光响应特性和稳定性，具有广阔的应用前景，从分子水平设计和调控其性能具有重要意义。而当前液晶高分子合成其分子量、分布、拓扑结构等可控性差。迫切需要合成具有明确结构的侧链液型晶高分子（SCLCPs），阐释结构对性能的影响机制。申请人前期明确了由于接枝密度控制呈现出拓扑效应与液晶性能的差异化“构-效”关系，但仍然存在聚合物功能化“选择性”差及精准“定位”难等问题。本项目拟基于共轭烯烃的活性阴离子聚合定制前期聚合，结合高效后续偶联手段，设计合成拓扑结构、多嵌段组装结构及序列结构明确的Azo-SCLCPs并建立其高效合成方法，实现由液晶接枝密度可控、多嵌段主链“选择性”功能化到链中序列明确的精准“定位”功能化聚合物研究，阐释结构对性能的影响机制。

Azobiphenyl (Azo)-containing photo-induced LCPs with the unique photo response characteristic and stability have shown a wide variety of applications. It is of great significance to design and regulate the performance based on molecular design. However, the control in the synthesis of LCPs showed poor expression of the molecular weight and topological structure and so on. It is urgent to synthesize the well-designed side chain liquid crystalline polymers (SCLCPs) and reveal the mechanism of the impact of well-defined structures on properties. On this basis, herein due to the control of grafting density, the relationship between topology and LC performance showed the difference. However, some problems such as "selectivity" and precise " positioning" of polymer functionalization were still existed. In this project, on the bases of the controllable polymerization of conjugate Alkenes and the highly efficient coupling, a new series of Azo-SCLCPs with well-controlled topological, self-assembly and sequence-determined structures should be tailored, and the highly efficient and convenient methodologies can be established. This study will realize the well-designed functionalization varied from controlled grafting density, "selective" of multi-blocks to precise in-chain "positioning", which can be used to reveal the mechanism of the impact of the molecular structures on the properties.