Effects of antioxidant on mechanical and electromagnetic properties of carbonyl iron/ethylene propylene diene monomer composites

In this paper, we study the effect of the loading of poly(1,2-dihydro-2,2,4-trimethyl-quinoline) (antioxidant RD) on the carbonyl iron powder (CIP)/ethylene propylene diene monomer (EPDM) composite absorbing material under high-temperature environment.Through macro- and micro-analysis, it is found that the composite material loaded with 0 phr antioxidant RD fail due to the aging of the rubber matrix at 150 °C for 2 days.When the load is 3 phr, the service life exceeds 10 days.In the electromagnetic performance test, the minimum reflectance of the sample with the antioxidant RD load of 0 phr increased from − 22.16 to − 17.39 dB within 2 days, and the effective absorption bandwidth (RL < − 10dB) was reduced from 2.23 to 2.04 GHz.And the minimum reflectance of the sample with the antioxidant RD loading of 3 phr increased from − 19.91 to − 16.81 dB within 10 days, and the effective absorption bandwidth was reduced from 2.25 to 2.06 GHz with small fluctuations.Therefore,loading antioxidant RD can effectively delay the aging rate of CIP/EPDM composite absorbing materials.