VISIBLE LIGHT PHOTOPOLYMERIZATION OF METHYL METHACRYLATE COINITIATED WITH TITANOCENE AND KETOCOUMARIN DYE

摘要

The photosensitive system which can initiate methyl methacrylate with visible light was composedof compound 1 bis（η-5-cyclopentadienyl）-bis[2,6-difluoro-3-（1-H-pyrrolyl）phenyl]titanium （titanocene） andcompound 2 [(3,3’-carbonylbis（7-diethylamino coumarin）] （ketocoumarin dye）. The high photosensitiveinitiating efficiency of this photosensitive system could be very promising for efficient system for laser （Ar+488 nm） to plate and photocuring for thick coating and ink. The variation of UV-visible spectrum ofcompound 2 during irradiation indicates that photolysis of compound 2 is through its triplet state and it canbe quenched by O2. The much quicker photobleaching of the photosensitive system suggests that there existscertain quick electron transfer reaction between compounds 1 and 2.