Abstract: In this paper,it was studied the effect of using ultrafine (nanoscale) full-vulcanized powdered rubber (VP-501) on epoxy resin． Analysis of FT-IR,universal tensile machine,DSC,DMTA and SEM were introduced to compare the mechanical properties of epoxy,curing kinetics,dynamic mechanical properties,tensile fracture surface morphology of epoxy resin with and without VP-501 nanoparticles． Resulting from the homogeneous dispersion of the nanoparticles in epoxy resin,the addition of VP-501 made substantial improvement on the impact properties while the tension properties and the flexural properties were not obviously reduced,increase glass transition temperature (Tg),from 148． 41℃ to 159． 08℃,and changed the tensile fracture morphology from smooth to rough． Consequently,epoxy resin is toughed by VP-501．

Key words: epoxy, carboxylated nitrile rubber, toughen