Enone dyes as visible photoinitiator in radical polymerization: The influence of peripheral N-alkylated (hetero)aromatic amine group
作者:Tanlong Xue、Boyuan Huang、Yang Li、Xin Li、Jun Nie、Xiaoqun Zhu
DOI:10.1016/j.jphotochem.2021.113449
日期:2021.10
In this work, three enone dyes (C3s) bearing N-alkylated pyrrole (C3PY), indole (C3ID) and carbazole (C3CZ) group were synthesized and characterized to explore the effect of peripheral group on their photoinitiation ability. C3s display good light absorption in the region of 300–500 nm. Under 405/460 nm LED irradiation, the polymerization kinetics of a diacrylate monomer in the presence of one-component
在这项工作中,合成并表征了三种带有 N-烷基化吡咯 (C3PY)、吲哚 (C3ID) 和咔唑 (C3CZ) 基团的烯酮染料 (C3s),以探讨外围基团对其光引发能力的影响。C3s 在 300-500 nm 范围内显示出良好的光吸收。在 405/460 nm LED 照射下,通过实时 FT-IR 技术研究了单组分 C3s 或双分子 C3s/三乙醇胺 (TEOA) 存在下二丙烯酸酯单体的聚合动力学。聚合曲线表明,C3s 可以引发聚合,TEOA 显着提高了 C3CZ 的引发效率,而对于 C3PY 和 C3ID,这种加速效应相对较小。为了破译这些现象,联合进行了稳态光解、循环伏安法和理论计算。因此,提出 C3PY 和 C3ID 倾向于通过分子内夺氢而发生光解。这项工作表明外围基团强烈影响烯酮光引发剂的引发能力。