Non-stoichiometric polymer-surfactant complexes obtained in a lamellar lyotropic medium

Agzenai, Yahya, Pacios, Isabel E. y Renamayor, Carmen S. . (2012) Non-stoichiometric polymer-surfactant complexes obtained in a lamellar lyotropic medium. Colloid and Polymer Science (v. 290), 2012, p. 1123-1132. ISSN: 0303-402X, EISSN: 1435-1536

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Título Non-stoichiometric polymer-surfactant complexes obtained in a lamellar lyotropic medium
Autor(es) Agzenai, Yahya
Pacios, Isabel E.
Renamayor, Carmen S.
Materia(s) Física
Química
Resumen The addition of a polyelectrolyte to lamellar media formed by an oppositely charged surfactant often leads to the coexistence of several phases without macroscopic phase separation, which makes their characterization difficult. Here, the effect of the polydiallyldimethylammonium chloride (PD) on the lamellar liquid crystal formed by the anionic surfactant Aerosol OT (AOT) and water is investigated. SAXS results are discussed regarding the changes in the lamellar spacing as a function on the PD or AOT concentrations. In most of the samples two lamellar phases, without macroscopic phase separation, are detected. One of them is a typical swollen phase, while the other is a collapsed phase, which corresponds to the polymer-surfactant complex. At concentrations of polymer up to 3 %wt the two lamellar phases coexist, however, at a critical concentration higher than 3 %wt, the swollen phase becomes isotropic, and a macroscopic phase separation takes place. A simple model is proposed to calculate the composition of the phases when macroscopic phase separation does not occur. The results thus calculated show that generally the polymer-surfactant complexes are non-stoichiometric containing a lesser amount of polymer than ideally expected.
Palabras clave SAXS
AOT
polydiallyldimethylammonium chloride
polymer-surfactant complex
Editor(es) Springer Verlag (Germany)
Fecha 2012-03-08
Formato application/pdf
Identificador bibliuned:DptoCTFQ-FCIE-MODELICO-1005
Publicado en la Revista Colloid and Polymer Science (v. 290), 2012, p. 1123-1132. ISSN: 0303-402X, EISSN: 1435-1536
Idioma eng
Versión de la publicación publishedVersion
Relacionado con el proyecto: info:eu-repo/grantAgreement/S2009/ESP-1691
Tipo de recurso Article
Derechos de acceso y licencia http://creativecommons.org/licenses/by-nc-nd/4.0
info:eu-repo/semantics/openAccess
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Creado: Wed, 03 Sep 2014, 14:19:27 CET