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Schwarz, S. ; Jaeger, W. ; Bratskaya, S. ; Bohrisch, J. ; Schimmel, T. ; Mende, M. ; Oelmann, M. ; Boyko, V.
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 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.

Source
Colloids and Surfaces A: Physicochemical and Engineering Aspects 276, 65-71

DOI
http://dx.doi.org/10.1016/j.colsurfa.2005.10.017

Published
March 2006
 
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