Low temperature cure-on-command polymerization induced via free radical initiator in an oscillating magnetic field

摘要

Three magnetic nanoparticles (Fe3O4, FeCo, Co) were prepared and modified with azo-based free radical initiators via grafting. The resulting magnetic particles underwent a free radical initiation process in an oscillating magnetic field. Three acrylated oligomers, a urethane, epoxide, and polyphosphazene, were used to investigate the curing potential of the magnetic initiators (MI). The curing temperature, Tg, and conversion of the three MI based systems were compared. All three of the MI systems underwent initiation with only a modest temperature increase. The overall conversion and Tg for the MI initiated systems were lower than expected, but with some optimization an similar to 80% conversion could be obtained. (C) 2016 Elsevier B.V. All rights reserved.