Hexaarylbisimidazoles and ketocyanine dyes as effective electron transfer photoinitiating systems
Polimery 2002, No 9, 654
Four different hexaarylbisimidazoles (HABIs) and 5 ketocyanine dyes (JAWs) have been synthetized. Chemical structures and basic spectroscopic properties of JAWs obtained have been characterized. Free energy changes (ΔGel) of the process of electron transfer between HABIs and JAWs tested have been experimentally determined for 20 pairs of HABI + JAW. The dependence of the rate of 1,1,1-tri(acryloxymethyl)propane photopolymerization, initiated with RABI + JAW systems in the presence of mercaptobenzoxazole, on the ΔGel value and on the radiation wavelength (488 nm and 355 nm or 365 nm, Fig. 1) has been determined. It was found that chemical structures of HABI and JAW do not affect considerably the rate of polymerization.
Keywords: photoinitiators, electron transfer mechanism, hexaarylbisimidazole + ketocyanine dye systems, photopolymerization, 1,1,1-tri(acryloxymethyl)propane