Synthesis And Application Of Asymmetry Diphenylketone Photoinitiators

In this study, a series of novel functionalized benzophenone derivatives were elaborately designed and efficiently synthesized with low-cost raw materials through a simple esterification reaction of heteroatoms/heterocycles substituted hydroxybenzophenone with acyl chloride. The chemical structures of the compounds were carefully characterized by proton nuclear magnetic resonance (H-1 NMR), carbon nuclear magnetic resonance (C-13 NMR), and high-resolution mass spectrometry (HRMS). All compounds exhibited a strong and broad UV-visible light absorption spectrum in comparison with BP. Moreover, owing to the breaking symmetry and higher molecular weight, these compounds displayed efficient photoinitiating activity and low mobility and self-quenching as free radical photoinitiators. The resulting films exhibited much better mechanical properties compared with commercially available BP and Irgacure 184, implying potential application in industrial UV curing.