Hydrogen self-supplying initiators excited by visible light for the fabrication of transparent films  

作　　者：Qingze Pan Chiheng Liu Wenzhe Qiao Jianwei Li Saihe Yang Yangyang Xin Pengzhong Chen Jiangli Fan Xiaojun Peng 

机构地区：[1]State Key Laboratory of Fine Chemicals,Frontiers Science Center for Smart Materials Oriented Chemical Engineering,Dalian University of Technology,Dalian 116024,China [2]Ningbo Institute of Dalian University of Technology,Ningbo 315016,China [3]Key Lab of Organic Optoelectronics and Molecular Engineering of Ministry of Education,Department of Chemistry,Tsinghua University,Beijing 100084,China [4]Liaoning Binhai Laboratory,Dalian 116023,China

出　　处：《Science China Chemistry》2024年第11期3868-3874,共7页中国科学（化学英文版）

基　　金：supported by the National Natural Science Foundation of China (21925802, 22338005);the Liaoning Binhai Laboratory (LBLB-2023-03);the Fundamental Research Funds for the Central Universities (DUT22LAB601)。

摘　　要：Unimolecular Type Ⅱ radical photoinitiators(PIs) have received significant attention in photocuring owing to the fact that they improve the sustainability of the overall process compared with traditional Type Ⅱ radical photoinitiators. However, the photopolymerization efficiency of unimolecular Type Ⅱ radical photoinitiators is hindered by their short excitation wavelengths,poor photon capture abilities, and inefficient photobleaching performance. Herein, we report a coumarin-based self-sufficient initiator(C-NA), which is designed by integrating “hydrogen donor” and “hydrogen acceptor” into the coumarin framework and used for single-component visible light curing. C-NA exhibits a visible light absorbance and high molar extinction coefficient and is completely photobleached under the irradiation of 405 nm light-emitting diodes(LEDs). The formation of free radicals arises from the transfer of hydrogen from the diethylamino group to the coumarin framework, together with a highly efficient photodegradation process of C-NA. Finally, C-NA was successfully applied to prepare a transparent film material. Therefore,C-NA offers new insights into the design of promising unimolecular Type Ⅱ radical photoinitiators for photocuring.

关 键 词：PHOTOCURING PHOTOINITIATOR hydrogen transfer visible light unimolecular photobleaching 

分 类 号：TB383.2[一般工业技术—材料科学与工程]