Abstract
From the times of longitudinal spin-lattice relaxation of water molecules the authors estimate the amount of clustered water in aqueous solutions of polyelectrolyte complexes formed by sodium dodecylsulphate and the cationic copolymer N-vinylpyrolidone and N, N-diethylaminoethylmethacrylate iodoethylate for their different molar ratios γ. Binding of water to these complexes is characterized by the presence of a maximum at γ = 0.5 (0.25 g water per 1 g polyelectrolyte complex), a minimum at γ = 1.0 (0.11 g/g) and a second maximum at γ = 4.0 (0.21 g/g). The existence of two discrete states of these complexes with hydration maxima at γ = 0.5 and 4.0 is interpreted as the result of change in the morphology of the intracomplex cluster on passing to non-stoichiometric ratios of the components of the polyelectrolyte complexes.
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