LIU, Xiaoqing; HADDOU, Marie; GRILLO, Isabelle; MANA, Zohra; CHAPEL, Jean-Paul; SCHATZ, Christophe

doi:10.1039/c6sm01979j

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LIU, Xiaoqing
Laboratoire de Chimie des Polymères Organiques [LCPO]

HADDOU, Marie
Laboratoire de Chimie des Polymères Organiques [LCPO]

GRILLO, Isabelle
Institut Laue-Langevin [ILL]

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Ce document a été publié dans

Soft Matter. 2016, vol. 12, n° 44, p. 9030-9038

Royal Society of Chemistry

Résumé en anglais

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.< Réduire