Polyanion-polykation-komplexe mit saccharid-substituierten polyacrylsäuren und polyvinylaminen

Samples of saccharide‐substituted poly(acrylic acid) and polyvinylamine varying in DS and length of the saccharide side chains were investigated with regard to their polyelectrolyte character by determining their pK0a values and by a potentiometric, conductometric and turbidimetric titration with an oppositely charged polyelectrolyte. Criteria employed for the evaluation of these “symplex titrations” were the ratio of cationic to anionic groups at the endpoint and the course of the turbidimetric curve classified according to several schematized curve types. From the results obtained it can be concluded that substitution by saccharide side chains in the case of poly(acrylic acid) impedes Coulombic interaction to some extent only by steric hindrance, while in the case of the substituted polyvinylamines also intermolecular H‐bonds between the amino groups and the saccharide side chains have to be taken into account.