Abstract:In this paperꎬ the toughening of the T700/ epoxy composite was studied by using the polyetherimide
(PEI) as additive. Test results show that the toughness of epoxy resin composite was significantly improvedꎬ but the me ̄
chanical properties and glass transition temperature were slightly decreased. Under the premise of satisfying the strengthꎬ
the toughness of the composite was the best when the content of PEI was 20wt%ꎬ which was reaching 593.6 J/ m