EFFECTS OF DIRECT FLUORINATION ON SURFACE CONDUCTIVITY OF EPOXY RESIN INSULATORS

Yaqiang Liu () and Liqiang Li
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Yaqiang Liu: School of Physics and Electrical Information, Shangqiu Normal University, Shangqiu 476000, P. R. China;
Liqiang Li: School of Physics and Electrical Information, Shangqiu Normal University, Shangqiu 476000, P. R. China

Surface Review and Letters (SRL), 2014, vol. 21, issue 06, 1-7

Abstract: Epoxy resin samples were surface fluorinated using aF2/N2mixture at different temperatures of 25°C, 55°C, 75°C, and 95°C for the same time. Attenuated total reflection infrared (ATR-IR) analyses indicate substantial changes in surface chemical composition and structure by the fluorinations. Scanning electron microscope (SEM) observations show an increase in thickness of the fluorinated layer and a change in its surface morphology with fluorination temperature. Conductivity measurements reveal a large increase in surface conductivity and surface potential measurements consistently show a low initial surface potential and rapid potential decay after corona charging, strongly depending on fluorination temperature and environmental humidity. The initial surface potential was found to decrease dramatically above a critical surface conductivity and almost to zero when surface conductivity increased to 10-12S. Surface polarity of the epoxy sample was found to dramatically increase with fluorination temperature. An increase in the degree of chain scission with fluorination temperature is considered to be the main cause for the increases of surface conductivity and surface polarity.

Keywords: Epoxy resin insulator; surface fluorination; fluorination temperature; surface electrical properties; surface physicochemical characteristics (search for similar items in EconPapers)
Date: 2014
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DOI: 10.1142/S0218625X1450084X

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