Blending effect of vinyl ester resin on the epoxy matrix system

摘要

The room temperature (RT) curable epoxy (E) and vinyl ester (VE) resin systems with nearly same gellation times, have been selected to observe their mixing effect on mechanical properties. The studied mixing ratios of epoxy resin and vinyl ester resin were 100:0, 90:10, 80:20, 70:30, 60:40, 50:50 and 0:100 by weight. Two curing conditions were selected, only RT curing during 72 hours and RT curing during 72 hours and then post cured at 100 deg C during 1 hour. The tensile, flexural, impact strength have been measured. The small addition of VE resin in E resin gave a positive synergetic effect of mixing on mechanical properties. The maximum increase of the mechanical properties were generally observed with 20wt. percent of VE resin. The mixing of VE resin in E resin increased the gellation time of 50 percent. And this fact also changed the cross linking network to increase the flexibility, thus influenced on the final fracture surfaces.