Grafted and non-grafted polyurethane/epoxy resin interpenetrating polymer networks(PU/EP IPNs) were prepared by a sequential method,and effect of different PU/EP mass ratio on mechanical and thermal properties of these two types of IPNs was investigated.FT-IR analysis confirmed the formation of carbamate grafted structure within grafted PU/EP IPNs via a reaction between —NCO of polyurethane and —OH of epoxy resin.Results of mechanical properties test indicated that incorporation of polyurethane pre-polymer ...