Effect of 1-Butanol on the Contrast of Photopolymerizing Compounds Based on Dimethacrylate Esters

Abstract

The kinetics of visible-light-induced photopolymerization of dimethacrylate derived from phthalic acid, oligo(carbonate dimethacrylate), and triethylene glycol dimethacrylate (MDF-2, OKM-2, and TGM-3, respectively) in the bulk and in the presence of 10–30 wt % 1-butanol and of 9,10-phenanthrenequinone as initiator was studied. The illuminance in the reaction zone was varied from 10 to 40 klx. Introduction of 10 wt % 1-butanol into dimethacrylates of grades MDF-2 and OKM-2 does not alter their photopolymerization kinetics, and a further increase in the alcohol concentration leads to a decrease in the photopolymerization rate. Addition of 10 wt % and larger amounts of 1-butanol to dimethacrylate of grade TGM-3 makes the dependence of the photopolymerization rate at 1% monomer conversion and of the time of reaching 1% monomer conversion on the actinic radiation intensity considerably more pronounced.