材料期刊网

Two carboxylation processes were carried out to modify multi-walled carbon nanotube bundles (m-MWNTs). The results showed that both of the m-MWNTs could be highly dispersed in water with the concentration up to 25 and 15mg/mL in ethanol without obvious deposition or conglomeration over 6 months. FTIR, Raman, TGA and TEM characterizations of the m-MWNTs showed that hydroxyl and carboxyl groups have been attached with MWNTs, and that the nanotube structure was only damaged a little after modification treatments in mixed acids over 24h. Above prepared nanotube suspensions in water were successfully used as a filler of thermoplastic PVA composite to enhance its electrical conductivity. The results showed that the addition of m-MWNTs greatly improved the conductivity and the threshold of mass fraction was about 5wt The results also proved that purification process was not needed because of high ouritv of the raw MWNTs oreoared in our group.