Preparation and properties of MWCNTs-ODA/Ag/polyimide composite films

Abstract

Silver modified aminated carbon nanotubes(MWCNTs-ODA/Ag) were prepared by functionalizing carbon nanotubes with silver nitrate(AgNO3) and 4, 4'-diaminodiphenyl ether (ODA). After in-situ polymerization, coating and thermal amination, MWCNTs-ODA/Ag/PI composite films were obtained by using ODA and pyromellitic dianhydride (PMDA) as polyimide (PI) monomers and MWCNTs-ODA/Ag as nano fillers. The effects of different nano filler contents on properties of the composite films were analyzed. The results show that when the addition amount of MWCNTs-ODA/Ag is 3% (mass fraction, the same below), the tensile strength of Ag/PI-3% film is 123.0 MPa, which is 17.9% higher than Ag/PI-0% film. The thermal conductivity reaches 0.55 W·m-1·K-1, which is 5 times that of Ag/PI-0% film. The thermal conductivity of the composite film is greatly improved with excellent mechanical properties and heat resistance.

Keywords

• polyimide
• carbon nanotube
• thermal conductivity
• composite film