新型淀粉基非共轭荧光高分子的结构设计及功能化

荧光高分子广泛应用于荧光传感、信息加密存储、有机发光二极管等领域，极具科学研究意义及工业应用价值。相对于具有多苯环共轭结构的荧光高分子，非共轭型荧光高分子具有低的合成成本、环境友好性以及易于规模化生产，然而其开发利用仍存在发光机理不明、荧光强度不高以及加工困难等瓶颈问题。最新研究发现淀粉类生物质高分子具有“簇发光”现象，同时其分子量大，拓扑结构具有多样性，可利用表面可逆加成-断裂链转移聚合(RAFT)方法合成具有一体化结构的淀粉基非共轭荧光增强高分子材料。基于前期生物质高分子改性及功能化研究基础，本项目通过在淀粉侧链接枝共聚低含量乙烯基唑类单体来增强淀粉荧光性能，解析接枝共聚物荧光增强机理及有效调控机制，同时利用唑类与众多变价金属离子等非共价键作用，构筑离子动态交联网络，赋予材料自修复或形状记忆功能，最终获得具有性能优越且荧光增强的多功能型荧光高分子。

Fluorescent polymers are widely used in the fields of fluorescence sensing, information encryption storage, organic light-emitting diodes, etc., which are of great significance in scientific research and industrial application. Compared with fluorescent polymers with polyphenyl ring conjugated structure, non-conjugated fluorescent polymers have gained much attention because of their facile preparation, environmental friendliness, and easy large-scale production. However, challenges are still for application, such as unclear luminescence mechanism, low fluorescence intensity and processing problems. The clustering-triggered emission of biomass starch polymers was found in recent research and their advantages show in large molecular weight and diverse topological structure. Therefore, starch-based non-conjugated polymers with enhanced fluorescent and integrated structure could be synthesized by surface reversible addition-fragmentation chain transfer polymerization (RAFT). Based on previous studies in modification and functionalization of biomass polymers, the vinyl azole monomer was copolymerized to improve fluorescence properties of starch by grafting and fluorescence enhancement mechanism and effective control manner are investigated. At the same time, the coordination effect of azole and different metal ions was employed to obtain a enhanced fluorescent polymer with self-healing or shape memory properties.