The dynamical behaviour of water in aqueous PEO solutions has been studied by 2H and 1 7 0 nuclear magnetic relaxation measurements. A twophase model is introduced to analyse the water mobility in the PEO hydration phase. The water mobility in the hydrated phase is retarded by a factor of 2 to 5 . The anisotropic reorientation of water molecules in the proximity of PEO and the d,-dependence on the 2H and 170 relaxation rates are interpreted qualitatively by local PEO dynamics, preferential orientations of water molecules and deuteron exchange among water molecules and hydroxy end-groups.
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