文献类型：期刊文献

英文题名：Fused carbazole-coumarin-ketone dyes: high performance and photobleachable photoinitiators in free radical photopolymerization for deep photocuring under visible LED light irradiation

作者：Guo, Xinyue[1];Mao, Huanv[2];Bao, Chunyan[2];Wan, Decheng[1];Jin, Ming[1]

机构：[1]Tongji Univ, Sch Mat Sci & Engn, Dept Polymer Mat, 4800 Caoan Rd, Shanghai 201804, Peoples R China;[2]East China Univ Sci & Technol, Sch Chem & Mol Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China

年份：2022

卷号：13

期号：22

起止页码：3367

外文期刊名：POLYMER CHEMISTRY

收录：;EI(收录号：20222312200339);WOS:【SCI-EXPANDED(收录号:WOS:000801030000001)】；

基金：This work was supported by the National Natural Science Foundation of China (51873154).

语种：英文

外文关键词：Acrylic monomers - Density functional theory - Dental materials - Free radicals - Ketones - Light - Light emitting diodes - Photobleaching - Photolysis - Photopolymerization - Polycyclic aromatic hydrocarbons

摘要：In this work, three dyes based on fused carbazole-coumarin-ketone structures were designed and synthesized. These dyes were named CCK-Me, CCK-Ph, and CCK-Tol in accordance with their different substituents. Their excellent absorption properties can match the wavelength band of visible light-emitting diodes (LEDs) (i.e., 405-450 nm). Density functional theory calculations, steady-state photolysis, and electron spinning resonance spin trapping experiments were performed to explain the photophysical and photochemical mechanisms of the dyes. These dyes are available as one- or two-component type II photoinitiators (PIs). Both kinds can efficiently initiate the polymerization of acrylate monomers via two different mechanisms under 405-450 nm LED irradiation. Notably, CCK-Tol exhibited excellent photobleaching ability when initiated alone, making it ideal for deep curing. The polymeric samples were up to 57 mm thick. Remarkably, the photolysis product of CCK-Tol showed satisfactorily low cytotoxicity. The above excellent properties showed the great potential application of the dyes in various photocuring materials, especially dental materials and thick three-dimensional structures.