研究目的
This work focuses on the dynamics of the interfacial charges in cross-linked polyethylene (XLPE)/ethylene-propylene-diene (EPDM) dual layers to reveal the interfacial charge mechanisms using the energy band structure.
研究成果
The interfacial charge properties of XLPE/EPDM dual-layered dielectrics were studied with respect to their electronic energy structures. Bipolar charge dynamics were observed, attributed to charge transfer at the interface caused by electronic energy structure characteristics. Deep trapping sites and interface states contributed to the static interfacial charges. Interface traps, charge injection, and migration played significant roles in the dynamics of the interfacial charges.
研究不足
The study focuses on the interfacial charge dynamics in XLPE/EPDM dual layers under specific conditions. The findings may not be directly applicable to other materials or under different environmental conditions.
1：Experimental Design and Method Selection:
The study involves space charge measurements and quantum chemical calculations to analyze the interfacial charge dynamics in XLPE/EPDM dual layers.
2：Sample Selection and Data Sources:
Dual-layered dielectric insulating materials were prepared, with XLPE and EPDM as the layers.
3：List of Experimental Equipment and Materials:
A pulsed electroacoustic (PEA) method was used for space charge measurements. High voltage amplifier, pulse generator, PVDF thin film, and silicone oil were used for impedance matching.
4：Experimental Procedures and Operational Workflow:
The dual-layered sample was subjected to stepped electric fields, and space charge profiles were recorded.
5：Data Analysis Methods:
The electronic energy structures of XLPE and EPDM were analyzed using density functional theory (DFT) with the B3LYP hybrid functional and the 6-31G+ basis function.
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