Abstract
The process of complexation, whereby two polymer molecules interact physically to form a complex often with physical properties quite different from those of its constituents, has been studied with reference to poly(acrylic acid) and polyvinylpyrrolidone systems. Both the degree of linkage, θ, defined as the ratio of the bound groups to the total of potentially interacting groups, and the stability constant K of such complexes in solution in water and DMF have been determined as a function of temperature by means of potentiometric titration. It was found that θ and K are strongly dependent on temperature and the nature of the medium and that the hydrophobic interaction is a significant factor in the stabilization of the polycomplexes. The influence of small molecules on the complexation reaction has also been investigated and depending on the solvent employed, is shown to be great. Enthalpy and entropy changes of the systems were also calculated.
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