芳纶基环氧树脂/蒙脱土复合材料的制备及性能

Preparation and properties of aramid-based epoxy resin/montmorillonite composites

在自制的季铵盐改性蒙脱土(C-MMT)中分别加入KH-550、KH-560、KH-602硅烷偶联剂制得复合改性蒙脱土,并将其与自制的芳纶基环氧树脂按照不同比例添加到E-51环氧树脂中,以二乙烯三胺为固化剂制备了芳纶基环氧树脂/蒙脱土复合材料。通过对固化物的力学性能测试、示差扫描量热分析、热重及电镜分析研究了复合改性蒙脱土对复合材料性能的影响。结果表明,K550-C-MMT的质量分数为3%时制备的复合材料力学性能最优,拉伸强度、断裂伸长率、冲击强度、弯曲强度比纯E-51树脂有大幅提升。玻璃化温度小幅上升,固化物热稳定性提高,复合材料断面为韧性断裂。

The compound modified montmorillonite was prepared by adding KH-550,KH-560,KH-602 silane coupling agents to the self-made quaternary ammonium salt-modified montmorillonite(C-MMT).The aramid-based epoxy resin/montmorillonite composite materials were prepared by adding it and self-made aramid-based epoxy resin into E-51 epoxy resin in different proportions with diethylenetriamine as curing agent.The effects of compound modified montmorillonite on the properties of composites were studied through the mechanical propery test,DSC,TGA and SEM of the cured products.The results showed that the mechanical properties of the composites with 3wt% of K550-C-MMT was the best,and the tensile strength,elongation at break,impact strength and flexural strength werre greatly improved compared with those of pure E-51 resin.The glass transition temperature was increased slightly and the thermal stability of the cured product was improved.The cross-section of the composite material was ductile fracture.