Abstract
Interpolymer complexing of poly(acrylic acid) (PAA) with poly(N-vinyl-2-pyrrolidone) (PVP) as well as with chitosans (CHI) of various chain lengths was studied at different temperatures by pH measurements. The degree of conversion (θ), the complex stability constant, K, and the thermodynamic parameters of these reactions were evaluated. Complexing proceeds cooperatively in both systems and values of θ near unity are obtained for the higher molecular weight samples. The variation of K with θ for the PAA-CHI system indicates that this complex comprises long sequences of bound pairs of monomer units.
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