环氧化合物上浆处理的MWCNTs对MWCNTs/环氧树脂复合材料性能的影响

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%。

Effect of epoxide sizing treated MWCNTs on the properties of MWCNTs/epoxy composites

By the reaction of epoxy ring and the amino group on the surface of amine functionalized multiwalled carbon nanotube (MWCNTs-NH2 ),monofunctional epoxy compound benzyl ether (EP 692)and twelve-fourteen alkyl ether (EPAGE)were grafted onto the surface of MWCNTs using ball milling techndogy,known as sizing treatment.As a result,the MWCNTs-692 and MWCNTs-AGE with different molecular structure of sizing were prepared.On this basis,1wt% of MWCNTs-NH2 ,MWCNTs-692 and MWCNTs-AGE were added into diaminodi-phenylmethane (DDM)cured bisphenol a diglycidyl ether (DGEBA)system,respectively,and the effects of these MWCNTs on the viscosity-temperature relationships,cure kinetics,thermal-mechanical and flexural properties of the resulting epoxy composites were investigated.The results of FT-IR,TGA and XPS show that EP 692 and EP AGE can be successfully grafted onto the surface of MWCNTs via covalent bond.Comparing with MWCNTs-NH2 , MWCNTs-AGE and MWCNTs-692 can effectively improve the dispersion states and compatibility of MWCNTs in epoxy resin,reduce the influence of nanoparticles on the viscosity and curing kinetics of epoxy resin.Moreover, these MWCNTs can improve the storage modulus and flexural properties of epoxy resin,especially for the MWC-NTs-692 reinforced ones due to the existence of rigid functional groups.Comparing with the neat epoxy,the storage modulusof MWCNTs-692/epoxy composite increases by 30.6% after being added 1wt% MWCNTs-692,and the flexural strength and modulus of epoxy resin exhibit enhancement of 18.8% and 22.5%,respectively.