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Abstract
Abstract Ethylene butyl acrylate copolymer (EBA) has excellent thermal aging resistance and is a potential choice for the material of the inner semiconductive shielding layer of polypropylene (PP) insulated power cable. However, its crosslinking byproducts may affect the insulation properties of PP. In this article, the effect of crosslinking byproducts of EBA on the insulation properties of PP is investigated. The PP/propylene-based-elastomer (PP/PBE) blend films were prepared as test samples. Then the samples were soaked in liquid chemicals of the four main crosslinking byproducts of 1,4-bis (tert-butyl peroxy isopropyl) benzene (BIPB) separately, which has been widely used as the crosslinking agent for EBA. The structure changes of the samples were evaluated by the Fourier transform infrared spectrum. The carrier trap, DC conductivity, space charge accumulation, and DC breakdown strength of the samples were measured. Molecular dynamics simulations were performed to assist in the analysis of the diffusion of byproducts. The results indicated that the byproducts resulted in the generation of numerous shallow traps, leading to an enhancement in conductivity, substantial space charge accumulation, and reduction of DC breakdown strength of the insulation materials. Furthermore, the byproducts contributed to higher electric field distortion and a faster decay rate of charge. It was observed that small molecules appeared to have higher diffusion rates in PP/PBE blends. It is suggested that diffusion is a critical factor leading to the various impacts of the byproducts on the insulation properties of the blends.
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