Formation of polyelectrolyte complexes in a polycarboxybetaine/weak polyanion system

Polycarboxybetaines – polymers containing a substituted ammonium moiety and a carboxylate group in every monomer units – show in aqueous solutions a pH-dependent intramolecular charge interactions. Here, we show that despite of this intramolecular charge effect mixing positively charge polycarboxybe...

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Bibliographic Details
Published in:Colloids and surfaces. A, Physicochemical and engineering aspects Physicochemical and engineering aspects, 2006-03, Vol.276 (1), p.65-71
Main Authors: Schwarz, S., Jaeger, W., Bratskaya, S., Bohrisch, J., Schimmel, T., Mende, M., Oelmann, M., Boyko, V.
Format: Article
Language:English
Subjects:
Dynamic light scattering
Polybetaine
Polycarboxybetaine
Polyelectrolyte
Polyelectrolyte complex
Polyzwitterion
Viscosity
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Summary:Polycarboxybetaines – polymers containing a substituted ammonium moiety and a carboxylate group in every monomer units – show in aqueous solutions a pH-dependent intramolecular charge interactions. Here, we show that despite of this intramolecular charge effect mixing positively charge polycarboxybetaine and oppositely charged poly(maleic acid-co-propene) can yield polyelectrolyte complexes (PEC). Dynamic light scattering and viscometry has proved formation of highly swollen PEC nanoparticles with sizes in the range of 5–8 nm at n−/ n+ ratio from 0.6 to 1.0. Significant difference in charge densities and molecular dimensions in the solution were suggested as the main reasons for deviation from 1:1 PEC stoichiometry.
ISSN:0927-7757
1873-4359
DOI:10.1016/j.colsurfa.2005.10.017