A novel CNTs/polymer/PE composite with high electromagnetic shielding

A sandwich structure composite employing polyethylene and multi-walled carbon nanotubes/polymer, which is synthesized by in-situ polymerization on well aligned carbon nanotubes, is demonstrated with high electromagnetic shielding effectness. The shielding effectness of composites related with the orientation of carbon nanotubes embedded in the polyethylene was studied systematically. The shielding effectness of composites with parallel with the normal of polyethylene matrix were measured to be higher than those with carbon nanotubes perpendicularly to the composite surface or randomly oriented with frequency ranging from 0.3 GHz to 3.0 GHz.