▎ 摘　　要

Nevertheless, hybrid of two platy nano-size particles and theoretical evaluation of the mechanical properties of the resulting elastomer nanocomposite with superior properties was not addressed. Hybrid rubber nanocomposites based on ethylene propylene diene monomer (EPDM), acrylonitrile butadiene rubber (NBR), varying amounts of graphene nanoplatelets (GnPs) and graphene oxide nanoplatelets (GOnPs) were prepared by using a two-roll mill mixer. The effects of 1.5 wt % GnPs and GOnPs on the microstructure of the vulcanized EPDM/ NBR/GnPs/GOnPs compounds were precisely studied utilizing scanning electron microscopy (SEM) and transmission electron microscopy (TEM) micrographs. Moreover, their rheological and mechanical properties together with stiffness were discussed-both experimentally and theoretically-on the ground of tensile tests, dynamic mechanical thermal analysis (DMTA) and rubber processing analyzer (RPA). SEM micrographs provided from rubber nanocomposites containing 1.5 wt.% of either GnPs or GOPns revealed a rough fracture surface compared to that of the blend EPDM/NBR compounds. TEM images indicated a well-dispersed fashion of nanoplatelets within the rubber matrix regardless of the type of platelet. The tensile test analyses revealed a 100 % increase in the tensile strength for the nanocomposites containing both types of platelet-like nanoparticles. Theoretical analyses were in good agreement with experimental outcomes. The results of DMTA demonstrated a higher storage modulus with the introduction of nanoplatelets into the EPDM/NBR compound up to 1.59 MPa. Dielectric spectroscopy unraveled roughly 7 times higher conductivity with the incorporation of both GnPs and GOPns into the EPDM/NBR matrix.