ELECTRICALLY CONDUCTIVE NANOCOMPOSITES ELECTROMAGNETIC INTERFERENCE SHIELDING BASED ON EPDM RUBBER AND NANOGRPHITE/NANO NiFe2O4 HYBRIDIZED SYSTEM

Electromagnetic interference (EMI) shielding nanocomposite based on crosslinked Ethylene-Propylene-Diene-Monomer (EPDM), and hybridized nanosystem composite of conductive nanographite and ferromagnetic nano NiFe2O4 were fabricated via masterbach melt mixing process. The role of maleatedEPDM (EPDM-g-MAH) as interfacial compatiblized in the developed microsruuctare and hence conductivity thereshold as well as electromagnetic interference shielding effectiveness has been investigated. Microstructural characterization was performed as the nanocomposites using AFM, FE-SEM, TEM as well asmelt rheological measurment. Results exhibited that inclusion of our synthesized nano ferromagnetic particlesof NiFe2O4 woned lead to the increase of magnetic permeability and magnetic polarizability of the nanocomposites system, loading to the enhance shielding effectiveness. Morover, the hybridized nanofillers system not only lowered the conductivity thereshol, but also enhanced conductivity 102 -103 orders. Thesewere correlated with the melt rheological characteristics of the nanocomposites which exhibited higher meltelastic modulus with pseudo-solid like behavior with in low frequency regions, indicating the presence of larges physical network formed by the particles of the fillers throughout the EPDM matrix. The electrical conductivity as well as shielding effectiveness with in X-band frequency were found to be affected by the crosslink density of the EPDM matrix

کلیدواژه ها:

Nano graphite ، Nano NiFe2O4 ، Electrical Conductivity ، Electromagnetic interference shielding ، Nanocomposites