A NEW PHOTOINITIATOR SYSTEM BASED ON P-NITROANILINE IN THE PRESENCE OF ALIPHATIC TERTIARY-AMINES

Several kinetic aspects of the polymerization of dodecyl acrylate phot oinitiated with p-nitroaniline in the presence of an aliphatic tertiar y amine, either 2-(N,N-diethylamino)ethanol or 2-(N,N-dimethylamino)et hyl methacrylate, acting as coinitiator, were studied. Under low absor ption conditions, the rate of polymerization was found to be proportio nal to the square-root of the incident light intensity, the initiator and the coinitiator concentrations. The polymerization behaviour was a nalyzed also under aerobic conditions. Under identical irradiation con ditions, both initiation and polymerization processes present higher r ates and quantum yields than those obtained with conventional aromatic ketone photoinitiators.