title: Influence of substitution on the rheological properties and gelation of hydroxyethyl cellulose solution in NaOH-water solvent.
abstract: The rheological properties of hydroxyethyl cellulose (HEC) with a low molar substitution (MS) dissolved in 8wt% NaOH-water were studied as a function of solution temperature, polymer concentration and molar substitution. Special attention was paid to gelation kinetics. Similar to cellulose dissolved in alkali or ionic liquids, the intrinsic viscosity of HEC decreased with temperature increase, indicating a decrease of solvent thermodynamic quality. The gelation time of HEC solutions decreased exponentially with temperature but the kinetics is much slower than the gelation of microcrystalline cellulose solutions in the same solvent. Higher molar substitution leads to slower gelation. The small amount of introduced hydroxyethyl groups prevented cellulose aggregation thus increasing solution stability.
authors.affiliation: College of Textiles, Donghua University, Shanghai 201620, China; MINES ParisTech, PSL Research University, CEMEF - Centre de Mise en Forme des matériaux, CNRS UMR 7635, CS 10207 rue Claude Daunesse, 06904 Sophia Antipolis Cedex, France.
authors.forename: Wencong
authors.initials: W
authors.lastname: Wang
authors.affiliation: College of Textiles, Donghua University, Shanghai 201620, China.
authors.forename: Faxue
authors.initials: F
authors.lastname: Li
authors.affiliation: Modern Textile Institute, Donghua University, Shanghai 200051, China.
authors.forename: Jianyong
authors.initials: J
authors.lastname: Yu
authors.affiliation: MINES ParisTech, PSL Research University, CEMEF - Centre de Mise en Forme des matériaux, CNRS UMR 7635, CS 10207 rue Claude Daunesse, 06904 Sophia Antipolis Cedex, France. Electronic address: Patrick.Navard@mines-paristech.fr.
authors.forename: Patrick
authors.initials: P
authors.lastname: Navard
authors.affiliation: MINES ParisTech, PSL Research University, CEMEF - Centre de Mise en Forme des matériaux, CNRS UMR 7635, CS 10207 rue Claude Daunesse, 06904 Sophia Antipolis Cedex, France. Electronic address: Tatiana.budtova@mines-paristech.fr.
authors.forename: Tatiana
authors.initials: T
authors.lastname: Budtova
mesh_terms: D002482:Cellulose / Q000031:analogs & derivatives* / Q000737:chemistry; D005782:Gels / Q000737:chemistry; D052578:Ionic Liquids; D012212:Rheology; D012972:Sodium Hydroxide; D012997:Solvents; D013696:Temperature; D013816:Thermodynamics; D014783:Viscosity
chemical_list: D005782:Gels; D052578:Ionic Liquids; D012997:Solvents; D012972:Sodium Hydroxide; D002482:Cellulose; C002283:hydroxyethylcellulose
keywords: Cellulose; Gelation; Intrinsic viscosity; Low molar substitution; NaOH–water solvent; Rheology