Conductive Medium Coated Carbon Nanotbes And Their Applications For The Antistatic Of PEI

In order to improve the antisatic property of the carbon nanotube/PEI composite, two carbon nanotube modification strategies were adopted and the effect of moisture absorption to the antistatic property was discussed.For the first part of the research, a kind of polymer with antistatic and hydrophilic property (Poly(N,N-diethylacrylamide), PDEAAm for short) were grafted to the multi-walled carbon nanotubes (PDEAAm-g-MWCNTs). FT-IR, XPS and TEM proved a successful grafting. Estimated by XPS and TG analysis, weight fraction of the PDEAAm on the PDEAAm-g-CNTs was manifested as41wt%approximately. The PDEAAm-g-MWCNTs/polyetherimide (PEI) composite was prepared by conventional solution processed method. The PDEAAm plays dual functions as antistatic agent of PEI and high effective dispersion of MWCNTs. The composite achieved percolation threshold between the carbon nanotube loading level0.1-0.25wt.%after absorbing water under humid environment. Then it switches to nonconductor after dried. Comparing a sharp drop of MWCNTs/PEI composite, the tensile strength of PDEAAm-g-MWCNTs/PEI composite film is enhanced.Secondly, in order to improve the doping rate of the PANI and ameliorate the dispersion of the carbon nanotube, the PANI grafted carbon nanotube was doped by polyacrylic acid (PAA) secondarily. The FT-IR and XPS test prived a successful doping of the PAA. The doping rate was controlled by the concentration of the PAA. The conductivity of the PAA doped PANI grafted CNTs test suggested a dual effect of the PAA doping.