Early stage kinetics of polyelectrolyte complex coacervation monitored through stopped-flow light scattering

Abstract : Polyelectrolyte complexes (PECs) between poly(acrylic acid) (PAA) and poly(diallyldimethylammonium chloride) (PDADMAC), a model system forming coacervate particles via electrostatic interaction at pH 10, were prepared by a stopped-flow (SF) fast mixing technique at different mixing charge ratios (z) and ionic strengths. Both PEC final morphologies prepared by either SF or manual one-shot mixing are similar at bench time. In situ light scattering combined with the SF technique pointed-out, however, the presence of three distinct early stage kinetic behaviors in the formation of PECs. The first stage observed at low z is ascribed to the relaxation/reorganization of soluble PECs. At higher z or in the presence of salt, a second stage is found corresponding to the aggregation and/or rearrangement of small soluble PECs into larger structures. Redistribution of excess charges among those PECs produces some neutral condensed coacervate droplets as well, coexisting with PECs in a wide range of mixing ratios. Finally, a last process featured with bell-shaped curves indicates the full coacervation that quickens while approaching charge neutrality and/or at higher ionic strength.
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https://hal.archives-ouvertes.fr/hal-01416762
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Submitted on : Wednesday, December 14, 2016 - 6:05:32 PM
Last modification on : Friday, February 22, 2019 - 1:15:26 AM

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Xiaoqing Liu, Marie Haddou, Isabelle Grillo, Zohra Mana, Jean-Paul Chapel, et al.. Early stage kinetics of polyelectrolyte complex coacervation monitored through stopped-flow light scattering. Soft Matter, Royal Society of Chemistry, 2016, 12 (44), pp.9030-9038. ⟨10.1039/c6sm01979j⟩. ⟨hal-01416762⟩

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