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Nonstoichiometric polymer-surfactant complexes obtained in a lamellar lyotropic medium

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Abstract

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. Small-angle X-ray scattering 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 nonstoichiometric containing a lesser amount of polymer than ideally expected.

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Acknowledgments

This work received financial support from MICINN (Spain), under grant CTQ2919-16414, and from DGUI (Comunidad de Madrid), under R&D Program MODELICO-CM/S2009ESP-1691. We are indebted for beam time in the line BM16 of the ESRF (Grenoble). Prof. Arturo Horta is gratefully acknowledged for the helpful discussion and advice.

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  1. Department CC y TT Fisicoquímicas, Facultad de Ciencias, UNED, P° Senda del Rey 9, 28040, Madrid, Spain

    Yahya Agzenai, Carmen S. Renamayor & Isabel E. Pacios

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  1. Yahya Agzenai
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  2. Carmen S. Renamayor
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  3. Isabel E. Pacios
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Correspondence to Isabel E. Pacios.

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Agzenai, Y., Renamayor, C.S. & Pacios, I.E. Nonstoichiometric polymer-surfactant complexes obtained in a lamellar lyotropic medium. Colloid Polym Sci 290, 1123–1132 (2012). https://doi.org/10.1007/s00396-012-2635-9

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