聚合
木筏
材料科学
可逆加成-断裂链转移聚合
菲咯啉
自组装
兴奋剂
金属
碳纤维
化学工程
高分子化学
光化学
纳米技术
自由基聚合
化学
光电子学
聚合物
有机化学
复合材料
复合数
工程类
冶金
作者
Yang Xiao,Zhinan Xia,Weiguo Hu,Bei Liu,Changli Lü
出处
期刊:Small
[Wiley]
日期:2024-03-22
标识
DOI:10.1002/smll.202309893
摘要
Abstract Metal‐free organic photocatalysts for photo‐mediated reversible deactivation radical polymerization (photo‐RDRP) are witnessed to make increasing advancement in the precise synthesis of polymers. However, challenges still exist in the development of high‐efficiency and environmentally sustainable carbon dots (CDs)‐based organocatalysts. Herein, N‐doped CDs derived from phenanthroline derivative (Aphen) are prepared as metal‐free photocatalysts for photoinduced electron transfer reversible addition‐fragmentation chain transfer (PET‐RAFT) polymerization. The introduction of phenanthroline structure enhances the excited state lifetime of CDs and expands the conjugated length of their internal structure to enable the light‐absorption to reach green light region, thereby enhancing photocatalytic activity. The as‐designed CDs exhibit unprecedented photocatalytic capacity in photopolymerization even in large‐volume reaction (100 mL) with high monomer conversion and narrow polymer dispersity ( M w / M n < 1.20) under green light. The photocatalytic system is compatible with PET‐RAFT polymerization of numerous monomers and the production of high molecular weight polyacrylate ( M n >250 000) with exquisite spatiotemporal control. Above results confirm the potential of CDs as photocatalyst, which has not been achieved with other CDs catalysts used in photo‐RDRP. In addition, the construction of fluorescent polymer nanoparticles using CDs as both photocatalyst and phosphor through photoinitiated polymerization‐induced self‐assembly (Photo‐PISA) technology is successfully demonstrated for the first time.
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