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- W2020450186 abstract "The dielectric relaxation due to absorbed water has been studied with a number of epoxies and other thermosets. In all cases, the absorbed water relaxation strength, as measured by both the dielectric-constant increase and the increase in area under the ε″ versus1T curve, seems to be attributable to the relaxation of water dipoles and not to Maxwell-Wagner-Silars effects. The activation energies obtained are in the 11–16 kcal mol−1 range. The relaxation strengths observed show that the water molecules manifest roughly 70–100% of their free-state polarizability. In general, the dielectric constant increase per 1 wt% of water absorbed is given to a good approximation by 4.0[ε(dry) + 2]2pfT where f is the fractional polarizability of water in the polymer to its free-state value, found to be 0.7 to 1.0 for most thermosets, and ϱ and T are the density and temperature." @default.
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- W2020450186 date "1987-12-01" @default.
- W2020450186 modified "2023-10-14" @default.
- W2020450186 title "Dielectric relaxation due to absorbed water in various thermosets" @default.
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- W2020450186 doi "https://doi.org/10.1016/0032-3861(87)90389-2" @default.
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