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In radiation curing, typical reactive sites accessible to conversion are acrylate double bonds, vinyl groups oroxirane moieties. In a photoinitiated polymerisation reaction the reactive sites are consumed during chaininitiation and propagation until all reactive sites have been reacted, or more realistically, until conversion hasstopped. In the latter case some of the reactive sites are blocked by the solid network from being close enough to radicals or ions. A certain number of immobile reactive sites are generated. In particular, this is the case in curing of di-or multifunctional acrylates. Due to cross-linking, radiation cured formulations containing multifunctional acrylates form tight polymer networks showing a considerable amount of immobilised residual double bonds.
