Core-shell particles with an acrylate polyurethane core as tougheners for epoxy resins

In this paper we have prepared a new type of core-shell polyurethane latex particle in which acrylate polyurethane with a double bond was copolymerized with butyl acrylate to be the core, then methyl methacrylate polymerized around the core to be the shell in order to avoid the latex forming a membrane during separation of latex particles. The core-shell particles have been used as a modifier for epoxy resins and had a beneficial effect on toughening epoxy resins. In this work, acrylate polyurethane was prepared by a three-stage reaction under nitrogen atmosphere.