碳纳米管/碳纤维环氧树脂复合材料的制备及力学性能

摘要

对多壁碳纳米管(MWCNTs)进行改性处理,得到表面接枝1,3,5-苯三甲酸的碳纳米管(B-MWCNTs).分别将MWCNTs和B-MWCNTs分散在环氧树脂基体及上浆剂中,通过缠绕成型法制备含有MWCNTs的碳纤维增强环氧树脂预浸料,并采用热压成型工艺制备MWCNTs/碳纤维环氧树脂复合材料层合板.结果表明,B-MWCNTs在环氧树脂基体和上浆剂中的分散状态明显优于MWCNTs.添加B-MWCNTs后复合材料的玻璃化转变温度(Tg)和失重5%时对应的温度均有所提高.而且,添加B-MWCNTs可以明显提高碳纤维环氧树脂复合材料的力学性能.当MWCNTs含量为0.5%(质量分数)时,B-MWCNTs/碳纤维环氧树脂复合材料层合板的压缩强度、层间剪切强度和冲击后压缩强度(CAI)分别提高了14.3%,37.1%和23.4%.%Multi-walled carbon nanotubes with 1,3,5-benzenetricarboxylic acid (B-MWCNTs) were functionalized through surface modification of Multi-walled carbon nanotubes (MWCNTs).MWCNTs and B-MWCNTs were dispersed in epoxy resin and sizing agent respectively.Carbon fiber reinforced epoxy resin prepreg which containing carbon nanotubes was successfully produced by filament winding process and then the composite laminates were prepared by autoclave molding process.Results indicate that compared with MWCNTs, B-MWCNTs exhibit better dispersivity in epoxy resin and sizing agent.After the addition of B-MWCNTs, the glass-transition temperature (Tg) and the corresponding temperature at 5% mass loss of epoxy resin composites were improved.The mechanical properties of carbon fiber epoxy resin composites enhanced obviously with the addition of B-MWCNTs.When weight percentage content of B-MWCNTs is 0.5%, the compression strength, interlaminar shear strength and compression strength after impact (CAI) of B-MWCNTs/ carbon fiber epoxy resin composite laminates can be increased by 14.3%, 37.1% and 18.1%, respectively.