NDLI: Surface charge accumulation and decay on directfluorinated polyimide/Al<sub>2</sub>O<sub>3</sub> nanocomposites

Content Provider	IEEE Xplore Digital Library
Author	Du, B.X. Jie Li Wei Du
Copyright Year	1994
Abstract	Polyimide film, as a special type of engineering plastic film, is a basic insulating material and is widely applied in the electrical and electronic industry. Addition of nanoparticles into polyimide can improve the insulating properties compared with undoped material. However, due to the change of the material structure, the trap characteristics and charge behavior are altered as a consequence. The existence of surface charge has a great effect on the breakdown characteristic and is the main reason leading to dielectric breakdown. Fluorination as change the chemical component in surface layer of polymers should give rise to the corresponding change in electrical properties of the surface layer thus influence the charge injection from electrodes when they are used as an insulator. This paper presents a study aimed at clarifying the effect of fluorination and nanoparticles on the surface charge accumulation and decay behaviors of fluorinated polyimide nanocomposite film. Samples were prepared by dispersing nano-scale Al₂O₃ into polyimides with weight percentages of 0, 1, 3, 5 and 7 respectively. Then the samples were surface fluorinated in a laboratory vessel at about 328 K (55 °) using a F₂/N₂> mixture with 20% F₂ by volume and 0.05 MPa (500 mbar) for 30 minutes. Corona charging tests were performed at room temperature with a relative humidity of 40%. The charge distribution was measured by means of an electrostatic voltmeter. The results show the dependence of the charge density as well as the charge decay rate upon the fluorination and nanoparticle concentration, varying as a function of the charge polarity and charging time. It is suggested that the fluorination can significantly improve the decay rate of the surface charge in polyimide films.
Sponsorship	National Natural Science Foundation of China (NSFC) Region Centre Ville de Tours Conseil General D'Indre et Loire ABB IEEE Sandia National Laboratories TOSHIBA
Starting Page	1764
Ending Page	1771
Page Count	8
File Size	2382741
File Format	PDF
ISSN	10709878
Volume Number	20
Issue Number	5
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Polyimides Films Surface charging Nanocomposites Electrodes Dielectrics Surface treatment charge decay Polyimide/Al ₂O ₃ nanocomposites direct fluorination surface charge dynamic behavior charge accumulation
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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