刺激响应型聚集诱导发光纸芯片的构筑与调控机制

纸基荧光功能材料存在的聚集性荧光猝灭及刺激响应模式单一的问题是制约其在智能包装工业大规模发展的重要技术瓶颈，如何有效制备具有多重刺激响应特性的纸基发光材料是解决这一难题的关键。本项目创新性地将纤维素表面改性与RAFT活性可控聚合相结合，诱导具有不同刺激响应特性的聚合物链段以及聚集诱导发光小分子TPE在纤维素表面定向可控组装，构建温度-湿度刺激响应型聚集诱导发光纸芯片。探索小分子RAFT试剂辅助法对纤维素表面接枝的影响机制及表面RAFT聚合过程机制研究，明晰TPE分子内旋转受限过程与邻近刺激响应聚合物链段运动的变化规律及其发光特性，诠释基于纤维素嵌段聚合物材料微观结构和宏观性能的构效关系，揭示纸基功能材料温度-湿度-光响应三者间的动态关联机制，建立荧光热-湿响应的调控机制，形成以多重刺激响应为目标的聚集诱导发光纸芯片的可控制备方法，拓宽其在柔性显示以及光学信息加密等智能包装材料领域的应用。

Aggregated fluorescence quenching and single stimulus response mode of paper-based fluorescent functional materials are major technical bottlenecks restricting their large-scale development in intelligent packaging industry. How to effectively prepare paper-based luminescent materials with multiple stimulus response is the key to solve this problem. This project innovatively combines the surface modification of cellulose with RAFT polymerization, induces the directional and controllable assembly of polymer chains with different stimulus responses and aggregation-induced luminescence small molecules TPE on cellulose, so as to construct temperature-humidity stimulus-responsive aggregation-induced luminescence paper chips. The influence of small molecule RAFT agent on surface grafting of cellulose and the mechanism of RAFT surface polymerization were investigated. The influence of the motion of neighboring stimulus response polymer chain on TPE restricted intramolecular rotation process and their luminescence properties was interpreted. The structure-activity relationship and regulatory mechanisms of the microstructure and macroscopic properties of cellulose-based block polymer were also investigated. The dynamic correlation mechanism in temperature-humidity-light response of the paper-based material was pinpointed, thus to establish the regulation mechanism of fluorescence heat-humidity response. The project formed a controllable preparation method of flexible aggregation induced luminescence paper chip with multiple stimulus response, which showed potential application in the field of intelligent packaging materials such as intelligent flexible display and optical information encryption.