Impact of Polyelectrolyte Chemistry on the Thermodynamic Stability of Oppositely Charged Macromolecule/Surfactant Mixtures

Langmuir : the ACS Journal of Surfaces and Colloids
Katalin BodnárRóbert Mészáros

Abstract

The complexation between hexadecyl- and dodecyltrimethylammonium bromides (CTAB and DTAB) with sodium poly[(vinyl alcohol)-co-(vinyl sulfate)] (PVAS) copolymer of low charge density has been investigated using pyrene fluorescence spectroscopy, electrophoretic mobility, turbidity, and dynamic light scattering measurements. The results indicate that the binding of the cationic surfactant occurs in three steps. At low surfactant concentrations, the cationic amphiphile binds to the vinyl sulfate groups. Above charge neutralization, surfactant binding may occur on the surface of the hydrophobic vinyl sulfate/CnTAB nanoassemblies. At even higher concentrations, the surfactant binds on the nonionic vinyl alcohol units of the polyion which reswells the PVAS/CnTAB complexes and makes them highly soluble in water. In earlier studies on oppositely charged ionic surfactants and homopolyelectrolytes the impact of mixing protocols was found remarkable, especially at surfactant excess, where these systems can be trapped in the charge stabilized colloidal dispersion state. In contrast, in the case of PVAS/CnTAB mixtures the effect of mixing is less pronounced and diminishes with increasing ionic strength or decreasing alkyl chain length of the...Continue Reading

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Citations

Aug 16, 2016·ACS Applied Materials & Interfaces·Xiaoran HuSamuel W Thomas
Apr 24, 2020·Nanoscale Horizons : the Home for Rapid Reports of Exceptional Significance in Nanoscience and Nanotechnolgy·Heba AhmedLeslie Y Yeo
Sep 25, 2019·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Andrew AkannoRamón G Rubio
Mar 11, 2021·Advances in Colloid and Interface Science·Gustavo S LuengoAndrew J Greaves
Sep 19, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Ji Ha LeeKazuo Sakurai
Nov 6, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Krisztina BaliRóbert Mészáros

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