In practical applications,flexibility,lightweight,and high performance are the characteristics that polymer-based electromagnetic shielding materials should have.At present,it is still a great challenge to prepare polymer-based electromagnetic shielding materials with excellent conductivity,electromagnetic shielding properties,and mechanical properties.Therefore,in this work,single-walled carbon nanotubes/polyetherimide composite films are prepared by electrostatic spinning and vacuum-assisted filtration through using single-walled carbon nanotubes and polyetherimide as raw materials.By regulating the surface density of single-walled carbon nanotubes,the conductivity of the composite film can be enhanced to 1866 S/cm.For the electro-magnetic shielding performance,the total electromagnetic shielding effectiveness of single-walled carbon nanotubes/polyetherimide composite film in Ku band(12-18 GHz)is in a range of 75.78-81.83 dB,which is higher than that of pure single-walled carbon nanotube film(65.19-69.81 dB).This is attributed to the formation of interfaces between the polyetherimide fibers and the single-walled carbon nanotubes,with more interfaces consuming more electromagnetic wave energy for a given range of single-walled carbon nanotube surface densities.For the mechanical properties,the maximum tensile strength and elongation at the break of the single-walled carbon nanotube/polyetherimide film are 1.13 and 1.5 times higher than those of the single-walled carbon nanotube film,with the values of 28.52 MPa and 7.91％,respectively.As the surface density of single-walled carbon nanotubes increases,the interaction between single-walled carbon nanotubes as well as the interaction between polyetherimide fibers and single-walled carbon nanotubes at the interface plays a role in enhancing the mechanical properties of the composite films.The single-walled carbon nanotube/polyetherimide composite films,as an excellent polymer-based electromagnetic shielding composite material,can be used in fields such as the protection of precision electronic instruments and wearable electronic devices.
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