Precursors of hydrophilic polymers, 3. The potentiometric behaviour of isotactic and atactic poly(2‐dimethylaminoethyl methacrylate) in water/ethanol solutions

The dissociation constants of partially ionized isotactic and atactic poly(2‐dimethylaminoethyl methacrylate) in water/ethanol solutions were measured. The strong dependence of the apparent dissociation constant on the degree of ionization of the macromolecule is discussed using viscometric data and compared with the properties of low‐molecular‐weight model compounds. The values of the internal dissociation constants at various ionic strength in various water/ethanol solutions were obtained by extrapolation of the apparent dissociation constants to zero ionization degree of the macromolecule. The conformational structures of macromolecules in solution are discussed.