title: Contribution of flow field flow fractionation with on line static and dynamic light scattering to the study of hydrosoluble polyelectrolyte complexes.
abstract: Water soluble polyelectrolyte complexes (PECs) formed between polyaspartate (anionic polymer) and poly(trimethylammonium propyl methacrylamide chloride) (cationic polymer) were studied by flow field flow fractionation with on-line coupling multi-angle laser light scattering-quasi elastic light scattering-differential refractive index determination (F4/MALLS/QELS/DRI). The separation technique permits to characterize polydisperse PECs. The molar mass of the polycation (PC) influences the stiffness of the PECs and the proportion between single PECs (i.e. nPA/1PC) and multiple PECs (i.e. nPA/n'PC). High ionic strength with NaCl (>0.1 M) tends to break the multiple PECs while CaCl2 destroys PECs and leads to the formation of complexes polyaspartate/Ca2+. The studied PECs can be used as inhibitors to the calcite formation in the drilling fluids.
authors.affiliation: Polymères, Biopolymères, Membranes UMR 6522 CNRS-Université de Rouen, 76 821 Mont Saint Aignan, France.
authors.forename: Didier
authors.initials: D
authors.lastname: Le Cerf
authors.forename: Sébastien
authors.initials: S
authors.lastname: Simon
authors.forename: Jean-François
authors.initials: JF
authors.lastname: Argillier
authors.forename: Luc
authors.initials: L
authors.lastname: Picton