Study on the direct current properties of ultraviolet crosslinked epdm rubber

Abstract

Ethylene propylene diene monomer (EPDM) is widely used as an insulation material in power equipment due to its excellent insulation performance. This article studies the method of preparing EPDM rubber composites by UV cross-linking. It analyzes three traditional functional auxiliary cross-linking agents, namely allyl isocyanurate (TAIC), trimethylolpropane trimethyl Effects of methyl acrylate (TMPTMA), and N, N′-m-phenylene bismaleimide (N, N′) on the DC properties of EPDM rubber. Experimental results show that all three auxiliary cross-linking agents can effectively improve the DC conductivity of EPDM, and (N, N′) are the most effective. Thermal stimulation current (TSC) results show that the addition of N, N′ makes the traps of EPDM shallower. Based on density functional theory (DFT), the electrostatic potential of N, N’ molecules is calculated. The increase in DC conductivity of EPDM is because the N, N′ molecules have larger conjugated electron areas, forming a larger conductive area within the molecules, which is conducive to charge carrier transport.