Structure, thermodynamic and kinetic signatures of a synthetic polyelectrolyte coacervating system

Abstract : While many studies on coacervation have targeted biomacromolecules, we review in this article the key structure, thermodynamic and kinetic features of a fully synthetic coacervating system based on polyacrylic acid (PAA) and poly(diallyldimethylammonium chloride) (PDADMAC) oppositely charged polyelectrolytes at pH 10, where PAA chains are fully deprotonated. Among the main points of interest, we can highlight (i) the presence of polyelectrolyte complex (PEC) nanoparticles that, unexpectedly, coexist with a certain amount of coacervate droplets in a large range of compositions, even far from stoichiometry; (ii) the fact that these PEC nanoparticles are likely precursors of the coacervation occurring at stoichiometry; (iii) the formation of soluble PECs only in a certain range of physicochemical conditions; (iv) the equilibrium properties of the system; (v) and last but not least a distinctive kinetic signature at stoichiometry evidenced by a peak in light scattering at very short times (~ 100 ms). Some of these results can be rationalized on the basis of weak interaction unfolding between oppositely charged PAA and PDADMAC chains as revealed by microcalorimetry measurements.
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Submitted on : Saturday, January 28, 2017 - 3:29:32 PM
Last modification on : Thursday, January 11, 2018 - 6:28:09 AM

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Xiaoqing Liu, Jean-Paul Chapel, Christophe Schatz. Structure, thermodynamic and kinetic signatures of a synthetic polyelectrolyte coacervating system. Advances in Colloid and Interface Science, Elsevier, 2017, 239, pp.178-186. ⟨10.1016/j.cis.2016.10.004⟩. ⟨hal-01448614⟩

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