外电场下三元乙丙橡胶微观特性及其对沿面放电影响的研究

doi:10.11896/cldb.23070060

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Abstract Ethylene-propylene-diene monomer (EPDM), as a functional material, has attracted much attention in the field of medium and high voltage cable insulation. However, the actual service environment is harsh, and the surface discharge phenomenon occurs occasionally. In order to study the surface discharge characteristics of ethylene-propylene-diene monomer from the microscopic level, the density functional theory was used to analyze the molecular geometry, orbital energy levels, trap depth, density of states, electrostatic potential, excited state and other microscopic properties. The calculated results show that with the increase of electric field, the EPDM molecular chain extends and straightens gradually, and the dipole moment gradually increases to 8.164 D. The region near the third monomer gradually evolves into electron traps, and the trap depth decreases from 0.740 eV to 0.043 eV with the increase of electric field, and their number increases. The electrophilicity of carbon-carbon double bond makes the electrons in the third monomer region more active, which easily aggravates the development of electron avalanche. With the increase of external electric field, the excitation energy of EPDM molecular chain decreases gradually, and the absorption peak is red shifted, and electrons are easily excited at this time. The third monomer region is the main excitation region. When the excited electrons return to the ground state orbit, they will release photons, which is easy to form space photoionization in the surface gas, and induce the occurrence of surface discharge.

Key words： density functional theory ethylene-propylene-diene monomer external electric field surface discharge excited state

Published: 10 December 2024 Online: 2024-12-10

CLC number:

TM211

Fund:National Natural Science Foundation of China (51577105).

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	Articles by authors
	LI Yasha
	GUO Yujie
	XIA Yu
	WANG Jiamin
	YAN Xinyue
	CHEN Junzhang

Cite this article:

LI Yasha,GUO Yujie,XIA Yu, et al. Study on the Microscopic Properties of Ethylene-propylene-diene Monomer and Its Effect on Surface Discharge Under External Electric Field[J]. Materials Reports, 2024, 38(23): 23070060-8.

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http://www.mater-rep.com/EN/10.11896/cldb.23070060 OR http://www.mater-rep.com/EN/Y2024/V38/I23/23070060

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