M. El-Roz, Mohamad-Ali Tehfe, J. Lalevée
Feb 9, 2010
Citations
0
Influential Citations
19
Citations
Journal
Macromolecules
Abstract
A set of multivalent atom-containing amines (e.g., tetrakis(dimethylamido)silane, tetrakis(dimethylamido)tin(IV), tetrakis(diethylamido)titanium(IV), tetrakis(dimethylamido)zirconium(IV), and 1,3,5-triaza-7-phosphaadamantane) are proposed as new coinitiators in Type II photoinitiating systems (based, for example, on benzophenone) and additives for Type I photoinitiators (such as phenyl bis(2,4,6-trimethylbenzoyl)phosphine oxide and 2-hydroxy-2-methyl-1-phenyl-1-propanone) for free radical photopolymerization under air. The polymerization rates (Rp’s) were determined under experimental conditions where a strong detrimental oxygen effect is expected, that is, both under low light intensity and in thin low viscosity monomer samples. The remarkable performance achieved under air (up to a 100- and a 5-fold increase in Rp and final conversion (%), respectively) lies on the presence of a bimolecular homolytic substitution (SH2) reaction that allows us to convert peroxyls into new initiating radicals efficiently....