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A previous paper presented at Radlech 2002 discussed novel self-initiating resins that UV-cure with no or very little added photoinitiator. These resins contain a stable photoactive chromophore that becomes part of the resin/oligomer structure through the Michael addition reaction between 13-diketones, 13-ketoesters and/or 13-ketoamides with common acrylates. During the reaction, a new covalent bond is formed between the activated methylene carbon of the Michael donor and the terminal carbon of the acrylate double bond. Stoichiometric control allows for a second addition to occur at the same site such that the new product molecule features a ketone moiety attached to a fully-substituted carbon atom. This bond is inherently photolabile and provides the unique photosensitivity of this class of resins.
