Acta periodica technologica 2003 Issue 34, Pages: 71-82
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Rheologycal properties of sodium carboxymethylcellulose in the presence of electrolyte and mixed micelle of surfactants
Sovilj Verica J., Dokić Petar P., Petrović Lidija B.
One of the most significant aspects of polymer-surfactant interaction, from the practical point of view, is that of rheology control and viscosity enhancement. In the oppositely charged polyelectrolyte-surfactant system strong ionic interaction often leads to precipitation of the formed complex yielding serious problems. In this paper the interaction between anionic polyelectrolyte - sodium carboxymethylcellulose (NaCMC) and cationic surfactant - cethyltrimethylammonium bromide (CTMAB) has been investigated by rheological measurements. Addition of electrolyte NaBr and nonionic surfactant - Tween 80 reduced the binding strength, prevented the precipitation of the complex and increased the viscosity of the system. It was found that rheological properties are strong influenced by NaCMC-CTMAB interaction and the system exhibits either pseudoplastic or thixotropic or rheopectic behavior according to the intensity of interaction.
Keywords: polyelectrolyte-surfactant interaction, rheology, coacervation, phase
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