Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Thermal gelation properties of carboxymethyl cellulose and bentonite-carboxymethyl cellulose dispersions: Rheological considerations
AbstractThe aim of this work was to study the thermal behavior of carboxymethyl cellulose (CMC) aqueous solutions and bentonite-CMC mixtures, from room temperature to higher temperatures, above gelation, using a rheological analysis. The rheological properties of aqueous CMC solutions and bentonite-CMC dispersions at different mass concentrations of CMC (0.1, 0.5, 1.0 and 2.0wt%) were investigated at different temperatures (20, 40, 60 and 80°C) using large deformation rheological measurements.Viscosity measurements show that for both CMC solutions and bentonite-CMC dispersions sudden changes in viscosity occur as the temperature increases. The viscosity is found to decrease below a critical temperature which corresponds to a cloud point or gelation temperature. Above this later, the viscosity increases dramatically with temperature. Hydrophobic interaction is postulated to be the cause of gelation.
HighlightsCarboxymethyl cellulose (CMC) solutions and bentonite-CMC dispersions were found to be shear and temperature dependent.Effect of the temperature on the rheology of CMC solutions and bentonite-CMC dispersions was studied.Unusual behavior related to microstructural changes of the materials under shear and temperatureA cloud point temperature was measured in CMC solutions and bentonite-CMC dispersions.
Thermal gelation properties of carboxymethyl cellulose and bentonite-carboxymethyl cellulose dispersions: Rheological considerations
AbstractThe aim of this work was to study the thermal behavior of carboxymethyl cellulose (CMC) aqueous solutions and bentonite-CMC mixtures, from room temperature to higher temperatures, above gelation, using a rheological analysis. The rheological properties of aqueous CMC solutions and bentonite-CMC dispersions at different mass concentrations of CMC (0.1, 0.5, 1.0 and 2.0wt%) were investigated at different temperatures (20, 40, 60 and 80°C) using large deformation rheological measurements.Viscosity measurements show that for both CMC solutions and bentonite-CMC dispersions sudden changes in viscosity occur as the temperature increases. The viscosity is found to decrease below a critical temperature which corresponds to a cloud point or gelation temperature. Above this later, the viscosity increases dramatically with temperature. Hydrophobic interaction is postulated to be the cause of gelation.
HighlightsCarboxymethyl cellulose (CMC) solutions and bentonite-CMC dispersions were found to be shear and temperature dependent.Effect of the temperature on the rheology of CMC solutions and bentonite-CMC dispersions was studied.Unusual behavior related to microstructural changes of the materials under shear and temperatureA cloud point temperature was measured in CMC solutions and bentonite-CMC dispersions.
Thermal gelation properties of carboxymethyl cellulose and bentonite-carboxymethyl cellulose dispersions: Rheological considerations
Benslimane, Abdelhakim (Autor:in) / Bahlouli, Ilies Mohamed (Autor:in) / Bekkour, Karim (Autor:in) / Hammiche, Dalila (Autor:in)
Applied Clay Science ; 132-133 ; 702-710
26.08.2016
9 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch