Preparation of an electromagnetic shielding material based on PP/EPDM thermoplastic vulcanizate and carbon nanotube (CNT) nanocomposite

Nanocomposites based on dynamically vulcanized polypropylene (PP)/Ethylene-propylene-diene rubber (EPDM) thermoplastic elastomer and multi walled carbon nanotube (MWCNT) were fabricated via melt mixing process. The influences of CNT content and CNT feeding rout on complex permittivity were investigated through different amounts of CNT and adding CNT before and after dynamic vulcanization, respectively. The melt viscoelastic properties of samples were characterized using melt rheomechanical spectroscopy (RMS). The complex permittivity and shielding efficiency (SE) characteristics of nanocomposites were measured at the X band frequency via performing waveguide measurements