화학공학소재연구정보센터
Journal of Catalysis, Vol.361, 423-430, 2018
Cationic and free radical polymerization initiated by a visible-light sensitive complex based on the photocatalytic decarboxylation of carboxylic acid
The photopolymerization with important application has usually used the organic initiators sensitive to ultraviolet light. In this work, we designed a new visible-light initiator complex composed of iron doped TiO2 (TiO2:Fe-x%,Fe- x = 1, 5, and 10), succinic acid and iodonium salt (Ph2I+PF6-). The ternary complex was proved to efficiently initiate both cationic ring-opening polymerization and free radical polymerization. The mechanism studies with solid-state C-13-nuclear magnetic resonance (C-13 NMR) and gas chromatography-mass spectrometer (GCMS) clearly presented that the TiO2:Fe-x% nanoparticles catalyzed the decarboxylation of succinic acid in the pathway of photo-Kolbe reaction. Meanwhile, Ph2I+PF6- could serve as an electron acceptor. The reaction kinetics of epoxy resin and epoxy-acrylate hybrid resin were measured by the attenuated total reflection-Fourier transformation infrared (ATR-FTIR) spectroscopy. (C) 2018 Elsevier Inc. All rights reserved.