Abstract
As an insulating dielectric, polyimide is favorable for the application of optoelectronics, electrical insulation system in electric power industry, insulating, and packaging materials in space aircraft, due to its excellent thermal, mechanical and electrical insulating stability. The charge storage profile of such insulating dielectric is utmost important to its application, when it is exposed to electron irradiation, high voltage corona discharge or other treatments. These treatments could induce changes in physical and chemical properties of treated samples. To investigate the charge storage mechanism of the insulating dielectrics after high-voltage corona discharge, the relaxation processes responsible for corona charged polyimide films under different poling conditions were analyzed by the Thermally Stimulated Discharge Currents method (TSDC). In the results of thermal relaxation process, the appearance of various peaks in TSDC spectra provided a deep insight into the molecular status in the dielectric material and reflected stored space charge relaxation process in the insulating polymers after corona discharge treatments. Furthermore, the different space charge distribution status under various poling temperature and different discharge voltage level were also investigated, which could partly reflect the influence of the ambiance condition on the functional dielectrics after corona poling.
Highlights
Insulating polymeric materials, especially polyimide (PI), are increasingly used in the electrical insulation system in high voltage (HV) equipment for the generation, transmission and distribution system of electrical power due to its excellent electrical and mechanical properties.[1]
Surface potential decay properties of the polyimide films charged by corona triode system under different applied voltage conditions are shown in figure 3
In the results of thermal relaxation process, the appearance of various peaks in Thermally Stimulated Discharge Currents method (TSDC) spectra provided a deep insight into the molecular status in the dielectric material and reflected stored space charge relaxation process in the insulating polymers after corona discharge treatments
Summary
Insulating polymeric materials, especially polyimide (PI), are increasingly used in the electrical insulation system in high voltage (HV) equipment for the generation, transmission and distribution system of electrical power due to its excellent electrical and mechanical properties.[1] It is well known that the polyimide is a group of aromatic polymers which consists mainly of heterocyclic imides and aryl groups. The molecular structure of PI is shown, which is linked sequentially by simple atoms or groups. Excellent thermal stability, good dielectric properties and low water absorption, polyimide is favorable for the application of optoelectronics, electrical insulation and aerospace craft. Polyimide films are used as substrate material in the industrial production of organic solar cells, packaging industry, sensor applications, etc..
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