Carboxyl-terminated butadiene-co-acrylonitrile (CTBN) was used as the toughener to improve the mechanical performance and fracture toughness of diglycidyl ether of bisphenol F (DGEBF) by prereacted approach. The results show that the chemical bonding interface was formed between DGEBF and CTBN particles in the prepolymerization reaction process, which remarkably enhances the fracture toughness of the composites. Based on the qualitative and quantitative analyses, it shows the main toughening mechanisms are the plastic shear banding effect resulted from the plastic deformation of the EP matrix and the plastic void expansion because of the debonding of CTBN particles from the EP matrix.

以羧基末端的丁二烯-丙烯腈（CTBN）为增韧剂，通过预反应的方法提高了双酚F（DGEBF）的二缩水甘油醚的机械性能和断裂韧性。结果表明，在预聚合反应过程中，DGEBF和CTBN颗粒之间形成了化学键合界面，从而显着提高了复合材料的断裂韧性。在定性和定量分析的基础上，它表明了主要的增韧机理是：EP基体的塑性变形和CTBN颗粒从EP基体上脱粘而产生的塑性剪切带效应和塑性空隙膨胀。