多壁碳纳米管改性氰酸酯/环氧树脂基纳米复合材料的力学性能

Mechanical Properties of Cyanate Ester/Epoxy Resins Reinforced with Functionalized Multi-wall Carbon Nanotubes

用强酸氧化法与等离子体镀膜法分别对原始多壁碳纳米管(MWCNTs)进行表面修饰,制备了MWCNTs改性氰酸酯/环氧树脂基纳米复合材料。对复合材料的断裂面进行SEM分析,研究了表面处理方法对复合材料室温及低温力学性能的影响。结果表明,经等离子体镀膜表面修饰后的MWCNT在基体中分散更为均匀,与基体的界面结合力更强。经等离子体镀膜表面改性后的MWCNTs复合材料,当MWCNTs质量分数为0.3%时,其室温及低温拉伸强度、弹性模量和冲击强度较纯氰酸酯/环氧树脂基体均有不同程度的提高。

Chemical oxidation and plasma polymerization were employed to functionalize the surfaces of multi-wall carbon nanotubes(MWCNTs). Then MWCNTs reinforced cyanate ester/epoxy resin nanocomposites were manufactured. The effect of the two functionalization processes on mechanical properties of the nanocomposite was investigated in terms of tensile test at room and cryogenic temperatures and observation of their fracture surfaces with SEM. Results show that the plasma polymerized MWCNTs(plasma-MWCNTs) may be dispersed more homogenously in the matrix and possess stronger interfacial bonding with the resin in comparison with the chemical oxidized ones. With addition of 0.3%(mass fraction) plasma-MWCNTs, the tensile strength, tensile modulus and impact strength of nanocompoistes at room and cryogenic temperature were simultaneously improved compared with the pure cyanate ester/epoxy resin matrix.