Polyelectrolyte-surfactant complexes formed by poly[3,5-bis(trimethylammoniummethyl)4-hydroxystyrene iodide]-block-poly(ethylene oxide) and sodium dodecyl sulfate in aqueous solutions

0359222 - ÚMCH 2012 RIV US eng J - Journal Article
Štěpánek, M. - Matějíček, P. - Procházka, K. - Filippov, Sergey K. - Angelov, Borislav - Šlouf, Miroslav - Mountrichas, G. - Pispas, S.
Polyelectrolyte-surfactant complexes formed by poly[3,5-bis(trimethylammoniummethyl)4-hydroxystyrene iodide]-block-poly(ethylene oxide) and sodium dodecyl sulfate in aqueous solutions.
Langmuir. Roč. 27, č. 9 (2011), s. 5275-5281. ISSN 0743-7463
R&D Projects: GA MŠMT ME09059; GA ČR GCP205/11/J043; GA ČR GAP208/10/0353
Institutional research plan: CEZ:AV0Z40500505
Keywords : polyelectrolyte-surfactant complexes * sodium dodecyl sulfate * small-angle X-ray scattering
Subject RIV: CD - Macromolecular Chemistry
Impact factor: 4.186, year: 2011

Formation of polyelectrolyte−surfactant (PE−S) complexes of poly[3,5-bis(trimethylammoniummethyl)-4-hydroxystyrene iodide]-block-poly(ethylene oxide) (QNPHOS−PEO) and sodium dodecyl sulfate (SDS) in aqueous solution was studied by dynamic and electrophoretic light scattering, SAXS, AFM, and fluorometry. SAXS data from the QNPHOS−PEO/SDS solutions were fitted assuming contributions from free copolymer, PE−S aggregates described by a mass fractal model, and densely packed surfactant micelles inside the aggregates. It was found that, unlike other systems of a double hydrophilic block polyelectrolyte and an oppositely charged surfactant, PE−S aggregates of the QNPHOS−PEO/SDS system do not form core−shell particles and the PE−S complex precipitates before reaching the charge equivalence between dodecyl sulfate anions and QNPHOS polycationic blocks, most likely because of conformational rigidity of the QNPHOS blocks, which prevents the system from the corresponding rearrangement.
Permanent Link: http://hdl.handle.net/11104/0006434