Study on Toughening of Heat-resistant Epoxy Resin

The toughening of epoxy resin was made by means of simultaneous curing of bisphenol-F-epoxy resin (EP) with bisphenol-A-vinyl ester resin (VER). The curing behavior of the blend systems was studied by using differential scanning calorimetry(DSC).Dynamical mechanical thermal analysis (DMTA) and scanning elecron microscope (SEM) were used to determine the mechanical properties and heat resistance to characterize the microstructures of the samples. The results showed that when m(VER)∶m(EP)=90∶10, the glass transition temperature came up to 207.3 ℃, 25℃ and 75℃ higher than those of EP and VER respectively. When m(VER)∶m(EP)=50∶50, the impact strength of the blend system came up to 8.08 kJ/m 2, the blend system had the best overall mechanical properties and better heat resistance.