Abstract
Thermally stimulated depolarization current (TSDC) measurements on frozen methylcellulose aqueous solutions in a wide concentration range, c = 0.025–2.0 g/ℓ, and on hydrated methylcellulose solid samples in a wide range of water contents, h = 1.8–48.1%, show a complex dispersion in the temperature range 100–160 K. The dispersion is attributed to orientational polarization of water molecules: free and loosely bound water molecules in the solutions and loosely bound water molecules in the solid samples. The dielectric relaxation of water molecules sorbed in the solid samples was studied in detail. It is described by a continuous distribution of relaxation times with both the activation energy W and the pre-exponential factor τ 0 in the Arrhenius equation being distributed parameters. The results suggest hydration in multilayers.
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