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Polymer complexes were formed through electrostatic interaction in poly(methacrylic acid)‐integral type polycation systems and hydrogen bonding in the poly(methacrylic acid)‐poly( N ‐vinyl‐2‐pyrrolidone) system in several solvents. The composition of the polyelectrolyte complex was affected by the chemical properties of solvents, e.g., the dissociation of the component polyelectrolyte was interferred with decreasing the polarity of the solvent. The heats of mixing in case of the combination of poly(methacrylic acid)‐poly( N ‐vinyl‐2‐pyrrolidone) were negative in N,N ‐dimethylformamide but they were positive in water. In polyelectrolyte complex systems, they could not be measured by reason of some experimental difficulties. These results indicate that solvation of the component polymers is very important to clarify the mechanism of the formation of polymer complexes.
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Abe et al. (1978) studied this question.
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