An investigation of chitosan and sodium dodecyl sulfate interactions in acetic media

Lidija Petrović, Jelena Milinković, Jadranka Fraj, Sandra Bučko, Jaroslav Katona

Abstract


Polymer/surfactant association is a cooperative phenomenon where surfactant binds to the polymer in the form of aggregates, usually through electrostatic or hydrophobic forces. As already known, polyelectrolytes may interact with oppositely charged surfactants through electrostatic attraction that results in polymer/surfactant complex formation. This behavior could be desirable in wide range of application of polymer/surfactant mixtures, such as improving colloid stability, gelling, emulsification and microencapsulation. In the present study surface tension, turbidity, viscosity and electrophoretic mobility measurements were used to investigate interactions of cationic polyelectrolyte chitosan (Ch) and oppositely charged anionic surfactant, sodium dodecyl sulfate (SDS), in buffered water. Obtained results show the presence of interactions that lead to Ch/SDS complexes formation at all investigated pH and for all investigated polymer concentrations. Mechanisms of interaction, as well as characteristics of formed Ch/SDS complexes, are highly dependent on their mass ratio in the mixtures, while pH has no significant influence.

 


Keywords


polymer/surfactant complexes; cationic polyelectrolyte; anionic surfactant; surface tension; viscosity; electrophoretic mobility

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DOI: https://doi.org/10.2298/JSC151119024P

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