Abstract
The electrical conductivity of poly(hydroxyethyl acrylate) PHEA, hydrogels was studied by means of dielectric relaxation spectroscopy in wide ranges of frequency (5 Hz–2 GHz), temperature (173–363 K) and water content (0.065–0.46 g of water per gram of dry material). The data are analyzed within the formalisms of permittivity, impedance and modulus. The results are discussed in terms of temperature- and water-induced effects, shape of the response, fragility and homogeneous–heterogeneous nature of the hydrogels.
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