Journal
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
Volume 429, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2022.113938
Keywords
Double benzylidene ketone; Charge transfer; Photoinitiator; Photopolymerization; Photosensitizer
Categories
Funding
- Beijing Natural Science Foundation [2202035]
- Beijing University of Chemical Technology CHEMCLOUDCOMPUTING Platform
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In this study, four novel double benzylidene ketone dyes were synthesized and demonstrated to have good charge transfer characteristics and high absorption capability. These dyes can be used as photoinitiators or charge transfer sensitizers to initiate photopolymerization under specific light sources. The experiments showed that the dyes with polyarylamine groups exhibited high sensitization and initiation activities under specific light sources.
In this work, four novel double benzylidene ketone dyes (TPA-H, CZ-H, TPA-C, and CZ-C) with D-A structure were synthesized and showed good charge transfer characteristics and high absorption capability in the visible light range. The double benzylidene ketone dyes can be used as type II photoinitiators to initiate free radical photopolymerization (FRP) or as charge transfer sensitizers to sensitize diaryliodonium salt (ONI) synergistically for the initiation of FRP and cationic photopolymerization (CP) together with aromatic amine groups under 460 and 532 nm LED light sources. FRP and CP experiments revealed that TPA-C and CZ-C with polyarylamine groups had high sensitization and initiation activities under 460 and 532 nm LED light sources. The photochemical properties of the initiator system were investigated by means of steady-state photolysis, fluorescence quenching, cyclic voltammetry, and electron spin resonance spin trapping experiments.
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