Fig. 3. Free-radical photopolymerization profiles (double bond conversion vs. irradiation time) initiated by a two-component photoinitiating system based on diphenyliodonium salt (1% wt) and 2-(diethylamino)-4-(1-ethylpropyl)-6-phenyl-benzene-1,3-dicarbonitrile derivatives (0.1% wt) under irradiation at 405 nm (8.13 mW cm⁻²). The reference photoinitiator was bis-(4-t-butylphenyl)iodonium hexafluorophosphate (1% wt) alone.