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Influence of the comonomer structure and of the initial pH on the characteristics of polyelectrolyte complexes based on maleic acid copolymers

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Abstract

The interaction between some hydrophilic and hydrophobic maleic acid copolymers and a strong polycation, poly(diallyldimethylammonium chloride), at low concentration and different pH, with the formation of polyelectrolyte complex (PEC) dispersions, was the object of this study. Poly(maleic acid–alt–vinyl acetate) was used as hydrophilic copolymer and poly(maleic acid–alt–styrene) and poly(maleic acid–alt–2-vinylnaphthalene) were used as more hydrophobic copolymers. A special attention was given to the in-situ investigation by turbidimetry, potentiometry, and conductometry of the formed PECs and to their characterization after 24 h by optical density, dynamic light scattering and atomic force microscopy. Taking into account that the conformation of the copolymers is influenced by their neutralization degree, related to the solution pH, we had investigated the influence of this parameter on the PEC formation at pH = 6, where around half of the carboxylic groups are neutralized, and at pH = 10, at totally dissociated state. This study focused on the influence of the comonomer hydrophilic/hydrophobic nature, polyions mixing order, and starting pH of the solutions on the ratio of the complementary polyelectrolytes at the titration end-point and on the PEC particles size.

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Acknowledgment

D.M. Suflet acknowledges the financial support of European Social Fund – “Cristofor I. Simionescu” Postdoctoral Fellowship Program (ID POS-DRU/89/1.5/S/55216), Sectoral Operational Programme Human Resources Development 2007e2013.

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Correspondence to Irina Popescu.

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Popescu, I., Suflet, D.M. & Mihai, M. Influence of the comonomer structure and of the initial pH on the characteristics of polyelectrolyte complexes based on maleic acid copolymers. J Polym Res 19, 9958 (2012). https://doi.org/10.1007/s10965-012-9958-6

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  • DOI: https://doi.org/10.1007/s10965-012-9958-6

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