title: Kinetics of shear-induced gel deswelling/solvent release.
abstract: The kinetics of shear-induced deswelling of gel particles based on synthetic (sodium polyacrylate) and natural (alginate) polymers was studied by rheo-optical technique. A swollen spherical gel particle of 100+/-50 microm diameter was placed in silicone oil and the evolution of the gel size as a function of time and shear rate was monitored. Different aqueous polymer solutions were used as synthetic gel solvent: polyvinylpyrrolidone, hydroxypropyl cellulose and glucose-based polymer. The interfacial tension (gel solvent)/(silicone oil), gel degree of swelling, solvent quality and viscosity are the main parameters influencing the kinetics of shear-induced gel deswelling. The kinetics of gel volume loss was approximated by a modified Weibull equation.
authors.affiliation: Ecole des Mines de Paris, Centre de Mise en Forme des Matériaux, UMR CNRS/Ecole des Mines de Paris 7635, BP 207, 06904 Sophia-Antipolis, France.
authors.forename: Undina
authors.initials: U
authors.lastname: Zeo
authors.forename: Elena
authors.initials: E
authors.lastname: Tarabukina
authors.forename: Tatiana
authors.initials: T
authors.lastname: Budtova
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D000464:Alginates / Q000737:chemistry*; D020723:Glucuronic Acid / Q000737:chemistry; D006603:Hexuronic Acids / Q000737:chemistry; D020100:Hydrogels / Q000737:chemistry*; D007700:Kinetics; D010316:Particle Size; D012212:Rheology; D012996:Solutions; D012997:Solvents / Q000737:chemistry*
chemical_list: D000180:Acrylic Resins; D000464:Alginates; D006603:Hexuronic Acids; D020100:Hydrogels; D012996:Solutions; D012997:Solvents; C006903:carbopol 940; D020723:Glucuronic Acid