中文摘要：

采用具有低固化收缩特性的苯并噁嗪树脂（benzoxazine,BOZ）对液体成型环氧树脂进行改性,以期在不改变液体成型树脂耐热性、工艺性及力学性能的前提下,大幅度降低树脂的固化收缩率.对比研究了不同BOZ含量改性树脂的固化收缩特性、固化反应特性、液体成型工艺性及力学性能.并采用真空辅助树脂浸渗（vacuum assisted resin infusion,VARI）工艺制备了单向碳纤维织物增强复合材料,研究了复合材料的力学性能.结果表明,加入BOZ对液体成型树脂的反应性、工艺性及耐热性影响不大,改性树脂的固化收缩随BOZ含量的提高逐渐减小,其中BOZ质量分数为15 wt%的改性树脂,较未改性树脂的固化收缩减小约80%,拉伸强度提高约19%,冲击强度提高约148%.以此改性树脂作为基体的复合材料相对于未改性树脂复合材料的拉伸强度提高约23%,层间剪切强度提高约9%,具有良好的力学性能和界面结合性能.

英文摘要：

Benzoxazine （BOZ） with low curing shrinkage was used to modify epoxy in liquid composite molding （LCM） process. The purpose was to reduce curing shrinkage of epoxy greatly, while the heat resistance,manufacturability and mechanical property did not decrease. The curing shrinkage property, curing reactivity,LCM manufacturability and mechanical properties of modified resins with different contents of BOZ were studied. Then the composites reinforced by unidirectional carbon fiber fabric were prepared by vacuum assisted resin infusion （VARI） process, and the mechanical properties of the composites were studied. The results show that the addition of BOZ basically has no influence on the curing reactivity, LCM manufacturability and heat resistance of epoxy. The curing shrinkage of modified resin decreases with the increasing of the BOZ content,andthe curing shrinkage of modified resin with 15 wt% BOZ decreases by about 79% , compared to the unmodified resin. Simultaneously,the tensile strength of the modified resin increases by about 19% , as well as the impact strength increases by about 148%. Moreover,the tensile strength and the interlaminar shear strength （ILSS） of the modified resin based composite improve by about 23% and 9% respectively,relative to the unmodified resin based composite. Namely, the mechanical properties and the interface bonding properties of the modified resin based composite are superior.