快速固化环氧树脂及其碳纤维/环氧复合材料性能

采用双酚A型环氧树脂（DGEBA）、改性咪唑（MIM）及改性脂肪胺（MAA）研制快速固化树脂体系。分别利用DSC和流变仪测试了树脂体系的固化特性与流变行为，优选了树脂配方。采用真空辅助树脂灌注工艺（VARIM）制备了快速成型的碳纤维/环氧复合材料层板，考察了层板的成型质量和力学性能，并与常规固化的层板性能进行了对比。结果表明：采用优选的树脂配方，120 ℃下树脂在5 min内固化度达95%，碳纤维/环氧复合材料层板成型固化时间可控制在13 min以内，固化度达95%以上，并且没有明显缺陷；与常规固化相比（固化时间大于2 h），快速固化碳纤维/环氧复合材料层板的弯曲性能和耐热性能降低幅度较小。

Rapid curing epoxy resin and the properties of carbon fiber/epoxy composite

A rapid curing resin system made from diglycidyl ether of bisphenol A (DGEBA) epoxy, modified imidazole (MIM) and modified aliphatic amine (MAA) was developed. The curing behavior and rheological characteristic of the resin were evaluated by DSC and rheological analysis respectively. The optimum ratio of the blending of curing agents was selected. The carbon fiber/epoxy resin composite laminates using this resin system were manufactured through vacuum assisted resin injection molding (VARIM) under short-term curing schedule. The processing quality and mechanical properties of the laminates were studied and compared with the properties of the laminates under traditional curing schedule. The results show that the curing time of the resin system is 5 min with 95% curing degree, and the cure time of the laminates using the studied resin can be controlled within 13 min under 120 ℃ with more than 95% curing degree and few defects. Compared with the laminates cured in traditional curing schedule (curing time more than 2 h), the laminates manufactured under short-term curing schedule exhibits slight decreases in the flexural property and thermal stability.