Evolutions of surface characteristics and electrical properties of the fluorinated epoxy resin during ultraviolet irradiation


The photoinduced evolutions of surface physicochemical characteristics and electrical properties of the fluorinated epoxy resin have been investigated. Cured epoxy resin sheets were surface fluorinated in an exceedingly laboratory vessel employing a F2/N2 mixture with twelve.fivepercent F2 by volume at zero.1 MPa and 95 °C for thirty min. The fluorinated epoxy sample together with the unfluorinated (original) one for a comparison were exposed to ultraviolet (UV) radiation with wavelengths of 320 to 390 nm. Throughout UV exposure, the evolution of surface physicochemical characteristics was investigated by attenuated total reflectance Fourier transform infrared spectroscopy, scanning electron microscopy, X-ray energy dispersive spectroscopy, and therefore the sessile drop technique. The corresponding evolution of surface electrical properties was evaluated by measurements of surface potential decay and surface conductivity. These results have shown that the crosslinking reaction rather than photodegradation occurred for the fluorinated sample, compared to endless degradation of the initial sample throughout the UV exposure. These results conjointly indicate that surface conduction and its sensitivity to humidity increased terribly significantly with UV exposure time for the initial sample, while the opposite changes in surface conduction and its moisture sensitivity with the exposure time were found for the fluorinated sample. A relationship between the evolutions of surface electrical properties and surface physicochemical characteristics has been established.

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