Abstract
A study has been made of acid-base properties of heterocyclic polymeric bases (polyethylene piperazine and polyethylene piperidine) and features of their interaction with polymeric acids have been investigated. It is shown that the ionization constants of the polymeric bases are significantly lower than those of their low molecular weight analogues. It was found that one nitrogen atom in the piperazine ring does not take part in complexation with polyacrylic acid, with the result that the polyelectrolyte complexes formed contain many free units of polyacrylic acid. The state of ionization of these units determines the phase state of the polyelectrolyte complexes. The properties of their gels in various media are shown to depend on the state of ionization of carboxyl groups that have not been incorporated into the system of interchain salt bonds. The behaviour of the gels in media with pH > 6·5 depends on the electrostatic repulsion of ionized free carboxyl groups of polyacrylic acid.
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