State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials, Laboratory of Advanced Optoelectronic Materials, College of Chemistry Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, China.
Department of Chemistry, Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, The Hong Kong University of Science & Technology, Clear Water Bay, Kowloon, Hong Kong, China.
Macromol Rapid Commun. 2018 Dec;39(24):e1800604. doi: 10.1002/marc.201800604. Epub 2018 Sep 25.
The 1,3-dipolar cycloaddition of activated internal alkynes with azides has been developed into an efficient polymerization reaction for constructing functional linear 1,4,5-trisubstitued polytriazoles. However, it is rarely employed for the synthesis of hyperbranched polymers. In this work, metal-free polycycloadditions of tris(3-phenylpropiolate)s (1) and tetraphenylethene-containing diazides (2) are performed in dimethylformamide at 100 °C for 7 and 12 h, producing hyperbranched poly(phenyltriazolylcarboxylate)s (hb-PPTCs) with high molecular weights and satisfactory regioregularities in good yields. The hb-PPTCs have good solubility in common organic solvents and high thermal stability. They are non-emissive in solutions, but emit intensively upon aggregation, showing an aggregation-induced emission effect. Their aggregates can work as fluorescent sensors for explosive detection with high sensitivity. Furthermore, the polymers can be utilized for the fabrication of 2D fluorescent patterns with high resolution by UV irradiation through copper grid masks.
叠氮化物与活化的内部炔烃的 1,3-偶极环加成已发展成为构建功能线性 1,4,5-三取代聚三唑的有效聚合反应。然而，它很少用于超支化聚合物的合成。在这项工作中，在 100°C 下，在二甲基甲酰胺中进行三（3-苯丙炔酸酯）（1）和含四苯乙烯的叠氮化物（2）的无金属多环加成反应 7 和 12 小时，以高产率得到具有高分子量和良好区域规整度的超支化聚（苯三唑基羧酸酯）（hb-PPTCs）。hb-PPTCs 在常见有机溶剂中具有良好的溶解性和高热稳定性。它们在溶液中不发光，但聚集时会强烈发光，表现出聚集诱导发光效应。它们的聚集体可以用作具有高灵敏度的爆炸物检测的荧光传感器。此外，聚合物可以通过铜网格掩模的紫外光照射用于制备具有高分辨率的 2D 荧光图案。
