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利用氨基化多壁碳纳米管(MWCNTs-NH2)与环氧化合物苄基缩水甘油醚(EP 692)和十二-十四烷基缩水甘油醚(EP AGE)反应,通过球磨工艺制备了两种不同分子结构环氧化合物上浆处理的多壁碳纳米管(MWCNTs)MWCNTs-692和MWCNTs-AGE。将均为1wt%的MWCNTs-NH2,MWCNTs-692和MWCNTs-AGE分别添加到二氨基二苯甲烷(DDM)固化双酚A二缩水甘油醚(DGEBA)环氧树脂体系中,分析了三种MWCNTs对树脂体系黏温关系、固化动力学、热力学性能和弯曲性能的影响。FT-IR,TGA和XPS测试表明,EP 692和EP AGE通过共价键接枝到碳纳米管的表面。与MWCNTs-NH2相比,MWCNTs-692和MWCNTs-AGE可以有效提高碳纳米管在环氧树脂基体中的分散性和相容性,减少纳米粒子对树脂体系黏度和固化动力学的影响。此外,添加上述三种碳纳米管都可以改善纯环氧树脂体系的储能模量和弯曲性能,其中经过含有刚性分子结构上浆剂处理的MWCNTs-692增强效果最为显著。添加1wt%MWCNTs-692后,MWCNTs-692/环氧树脂复合材料的常温储能模量提高了30.6%,弯曲强度和模量分别提高了18.8%和22.5%。
Amino-modified MWCNTs-NH2 were reacted with epoxides benzyl glycidyl ether (EP 692) and dodecyl tetradecyl glycidyl ether (EP AGE) by ball milling Multiwalled carbon nanotubes (MWCNTs) MWCNTs-692 and MWCNTs-AGE with different molecular structure epoxy compounds were prepared. MWCNTs-NH2, MWCNTs-692 and MWCNTs-AGE were added to the epoxy resin system of bisphenol A diglycidyl ether (DGEBA) cured by diaminodiphenylmethane (DDM) respectively. On the viscosity-temperature relationship of the resin system, curing kinetics, thermodynamic properties and bending properties. FT-IR, TGA and XPS tests showed that EP 692 and EP AGE were covalently grafted onto the surface of carbon nanotubes. Compared with MWCNTs-NH2, MWCNTs-692 and MWCNTs-AGE can effectively improve the dispersibility and compatibility of CNTs in epoxy matrix and reduce the influence of nano-particles on the viscosity and curing kinetics of the resin. In addition, the addition of the above three kinds of carbon nanotubes can improve the storage modulus and bending properties of the pure epoxy resin system. Among them, MWCNTs-692 reinforced by a rigid molecular structure sizing agent has the most significant enhancement effect. After adding 1wt% MWCNTs-692, the room temperature storage modulus of MWCNTs-692 / epoxy composites increased by 30.6%, flexural strength and modulus increased by 18.8% and 22.5% respectively.