D–D–A dyes with phenothiazine–carbazole/triphenylamine as double donors in photopolymerization under 455 nm and 532 nm laser beams

摘要: In order to enhance electron-donating ability and absorptivity in the visible region of spectrum, four novel organic dyes (CPC, TPC, CPN TPN) with carbazole–phenothiazine or triphenylamine–phenothiazine as double electron donors (D), cyanoacrylic acid an aldehyde group acceptor (A) have been designed synthesized. The exhibit charge transfer properties ground excited states absorb strongly spectral range 380–550 nm. Upon exposure irradiation a laser diode at 455 532 nm, together iodonium salt induced high polymerization efficiency cationic bisphenol-A epoxy resin A (DGEBA) free radical tripropylene glycol diacrylate (TPGDA). An electron-transfer photosensitization mechanism was established based on steady-state photolysis experiments, theoretical calculations molecular orbitals, electrochemical analysis. Our results showed that these would extensive application photopolymerization promoted by soft light.