Time-lapse thiol-acrylate polymerization using a pH clock reaction

A time-lapse polymerization exhibits a programable timebetween the mixing of the reagents and the onset of poly-merization. In fact, a free-radical polymerization systemcontaining an inhibitor can be thought of this way. Anotherapproach was invented by Norling that consisted of aperoxide or persulfate initiating system using iron or copperwith a special chelating agent and an organic reducingagent.