Fothergill, J., Zou, C. & Rowe, S. W. (2007). A "water shell" model for the dielectric properties of hydrated silica-filled epoxy nano-composites. Paper presented at the 2007 International Conference on Solid Dielectrics, Winchester, UK.
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The electrical properties of epoxy resin have been studied as a function of hydration. The epoxy was studied in an un-filled state, filled with 40 µm SiO2 particles, and filled with 50 nm SiO2 particles. The relative humidity was controlled by saturated salt solutions at ambient temperatures from 298-353 K. Measurements were made using dielectric spectroscopy over the frequency range 10-3-105 Hz. The hydration isotherm (i.e. the mass uptake of water) was established by measuring the mass as a function of relative humidity (RH). It was found that the nanocomposites absorb up to 60% more water than the unfilled and micro-filled epoxies. Dielectric spectroscopy shows different conduction and quasi-DC behaviours at very low frequencies (<10-2 Hz) with activation energies dependent on the hydration and temperature. These observations have led to the development of a “water shell” model to explain this phenomenon.
|Item Type:||Conference or Workshop Item (Paper)|
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|Subjects:||T Technology > TA Engineering (General). Civil engineering (General)|
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