Multiwalled Carbon Nanotubes Modified by Poly(N-vinyl-γ-aminobutyric acid)and the Properties of Its Epoxy Resin Nanocomposites
To improve the dispersion of multiwalled carbon nanotubes(MWCNTs)in the epoxy resin(EP)nanocomposite material,increase their interfacial interactions,and prepare EP nanocomposites with excellent properties,MWCNTs modified by poly(N-vinyl-γ-aminobutyric acid)were prepared through the hydrolysis and replacement of polyvinyl pyrrolidone(PVP)coated on the MWCNT surface.The weight loss rate,hydrophilicity and dispersion in water and acetone of MWCNTs in different reaction stages were studied.The modified MWCNTs were composited with EP to prepare nanocomposites and their mechanical properties were studied.The results show that the minimum weight loss rate of MWCNTs modified by poly(N-vinyl-γ-aminobutyric acid)is 8.36%,which decreases by 17.2%and 3.8%compared with PVP-modified MWCNTs and hydrolyzed-PVP-modified MWCNTs,and the dispersion effects in water and acetone are improved to some extent.MWCNTs modified by poly(N-vinyl-γ-aminobutyric acid)are difficult to peel from EP.MWCNTs are coated with thick interface layers,which could significantly improve the compatibility and interfacial interactions between MWCNTs and matrix EP.The addition of the modified MWCNTs improves the bending strength and toughness of the nanocomposites.When the MWCNT mass fraction is 0.25%,the nanocomposite impact strength increases by 50.1%and the bending strength increases by 6.05%.
万方数据
维普
