| In this paper, polysulfide-based elastomers were prepared by the thiol-acrylate Michael addition reaction and butadiene-acrylonitrile-based elastomers were prepared by the amine-acrylate Michael addition reaction.The first part, polysulfide-based elastomers were successfully prepared through a simple one-pot thiol-acrylate Michael reaction of the liquid polysulfide rubber (PFS) with bisphenol A diacrylate resin. The effects of molecular weight and cross-linking agent content of liquid polysulfide on the Michael addition reaction and Mechanical properties and Dynamic thermal mechanical properties of the elastomers were studied. And the results show that the molecular weight and cross-linking agent content of the liquid polysulfide oligomer had no effect on mercaptan functional group conversion. As the molecular weight of liquid polysulfide rubber increase, the tensile strength of polysulfide-based elastomers had no significant differences, but the elongation at break became larger and glass transition temperature turned lower. All of the obtained polysulfide elastomers are thermally stable with 5% weight loss at temperatures around 290℃, which was higher than it of the polysulfide elastomer cured by manganese dioxide (230℃).In addition, carbon black, silica and titanium dioxide were used as the reinforcing filler, and the tensile strength could be improved to 3 MPa and the elongation at break could be improved to 400%, which could be matched with the products cured by manganese dioxide.The second part, butadiene-acrylonitrile-based elastomers were successfully prepared by the Michael reaction between Amine-terminated butadiene acrylonitrile (ATBN) and acrylate resins. The effects of acrylonitrile content in the ATBN and the type of acrylate on Mechanical properties and Dynamic thermal mechanical properties of the elastomers were studied. And the results show that as acrylonitrile content in the ATBN increased the tensile strength of butadiene-acrylonitrile-based elastomers increased, but the elongation at break became decreased and the flexible segment glass transition temperature (Tg1) turned higher. With the rigidity of the acrylate increasing, the tensile strength of butadiene-acrylonitrile-based elastomers increased and the rigid segment glass transition temperature (Tg2) became higher.In this work, the Michael addition reaction was introduced into the polymerization of oligomer monomers and expanded its application. This vulcanization methodology will provide a new feasible approach for preparing polysulfide elastomers and butadiene-acrylonitrile-based elastomers. |
