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The radical step-growth addition reaction of thiols across the double bonds of -ene containing
compounds has garnered much attention in the scientific literature. Among the many interesting properties that these “click” reactions are noted for is self-initiation, i.e., the ability to photopolymerize without the need of photoinitiators or thermal curing. Self-initiation is desirable in industrial applications since it is highly efficient and not inhibited by the presence of dioxygen. Dioxygen inhibition of free-radical cure is a common problem in the coatings industry.1 We have recently prepared several self-initiating oligomers which had thiol and –ene components bound in one molecule.2 These unimolecular thiol-enes demonstrated enhanced mechanical and physical properties compared to conventional thiol-ene mixtures.
