title: Thermo-controlled rheology of electro-assembled polyanionic polysaccharide (alginate) and polycationic thermo-sensitive polymers.
abstract: Several thermo-sensitive polyelectrolyte complexes were prepared by ionic self-association between an anionic polysaccharide (alginate) and a monocationic copolymer (polyether amine, Jeffamine®-M2005) with a 'Low Critical Solubility Temperature' (LCST). We show that electro-association must be established below the aggregation temperature of the free Jeffamine®, after which the organization of the system is controlled by the thermo-association of Jeffamine® that was previously electro-associated with the alginate. Evidence for this comes primarily from the rheology in the semi-dilute region. Electro- and thermo-associative behaviours are optimal at a pH corresponding to maximum ionization of both compounds (around pH 7). High ionic strength could prevent the electro-association. The reversibility of the transition is possible only at temperatures lower than the LCST of Jeffamine®. Similar behaviour has been obtained with carboxymethyl cellulose (CMC), which suggests that this behaviour can be observed using a range of anionic polyelectrolytes. In contrast, no specific properties have been found for pullulan, which is a neutral polysaccharide.
authors.affiliation: Normandie Université, France; Université de Rouen, Laboratoire Polymères Biopolymères Surfaces, F-76821 Mont Saint Aignan, France; CNRS UMR 6270 & FR3038, F-76821 Mont Saint Aignan, France.
authors.forename: Pape Momar
authors.initials: PM
authors.lastname: Niang
authors.affiliation: Normandie Université, France; Université de Rouen, Laboratoire Polymères Biopolymères Surfaces, F-76821 Mont Saint Aignan, France; CNRS UMR 6270 & FR3038, F-76821 Mont Saint Aignan, France.
authors.forename: Zhiwei
authors.initials: Z
authors.lastname: Huang
authors.affiliation: Normandie Université, France; Université de Rouen, Laboratoire Polymères Biopolymères Surfaces, F-76821 Mont Saint Aignan, France; CNRS UMR 6270 & FR3038, F-76821 Mont Saint Aignan, France.
authors.forename: Virginie
authors.initials: V
authors.lastname: Dulong
authors.affiliation: Normandie Université, France; Université de Rouen, Laboratoire Polymères Biopolymères Surfaces, F-76821 Mont Saint Aignan, France; CNRS UMR 6270 & FR3038, F-76821 Mont Saint Aignan, France.
authors.forename: Zied
authors.initials: Z
authors.lastname: Souguir
authors.affiliation: Normandie Université, France; Université de Rouen, Laboratoire Polymères Biopolymères Surfaces, F-76821 Mont Saint Aignan, France; CNRS UMR 6270 & FR3038, F-76821 Mont Saint Aignan, France.
authors.forename: Didier
authors.initials: D
authors.lastname: Le Cerf
authors.affiliation: Normandie Université, France; Université de Rouen, Laboratoire Polymères Biopolymères Surfaces, F-76821 Mont Saint Aignan, France; CNRS UMR 6270 & FR3038, F-76821 Mont Saint Aignan, France. Electronic address: luc.picton@univ-rouen.fr.
authors.forename: Luc
authors.initials: L
authors.lastname: Picton
mesh_terms: D000464:Alginates / Q000737:chemistry*; D000588:Amines / Q000737:chemistry*; D020723:Glucuronic Acid / Q000737:chemistry; D006603:Hexuronic Acids / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D009994:Osmolar Concentration; D011108:Polymers / Q000737:chemistry*; D012212:Rheology; D013696:Temperature
chemical_list: D000464:Alginates; D000588:Amines; D006603:Hexuronic Acids; D011108:Polymers; D020723:Glucuronic Acid
keywords: Alginate; Auto-associated polymers; Jeffamine®; Rheology; Thermo-association