▎ 摘　　要

In this study, 1-wt% fluorinated couple agents were firstly used to modify the surface of high barrier graphene platelets (HBG). Then the modified HBG were incorporated into ethylene propylene diene monomer (EPDM). Due to high lamellar size/thickness ratio (about 3300), untreated HBG (HBG-un) increase the complex viscosity of EPDM composites. The surface modification of HBG by heptadecafluoro-decyl-triethoxy silane (17F) can reduce the surface energy of HBG and then decrease the complex viscosity of EPDM/HBG-un from 21,000 to 13,000 Pa s (about 40% decrease) at 1.7 Hz. Due to the increased physical entanglement and C=C bonds, HBG-un can increase the tensile and tear strength of EPDM control by about 3 and 2 times, respectively. The surface modification of 17F can slightly reduce the tensile and tear strength of EPDM/HBG-un by 9% and 8%, respectively. HBG-un can increase the thermal conductivity and dielectric constant of EPDM control by 17% and 2.8 times increase, respectively. Surface modification of 1-wt% 17F can remarkably reduce the dielectric loss of EPDM/HBG-un by 50% at 20 MHz, slightly affecting the dielectric constant and thermal conductivity. In addition, HBG-un can decrease the volume and surface resistivity of EPDM control by 2 and 1 order of magnitude, respectively, while 1-wt% 17F can both increase the surface and volume resistivity of EPDM by one order of magnitude.