DBPapers
DOI: 10.5593/SGEM2014/B11/S6.091

EFFECT OF POLYMER CONCENTRATION ON THE RHEOLOGICAL PROPERTIES OF POLYELECTROLYTE SOLUTIONS

K. Benyounes, A. Mellak, A. Benmounah, C. Oubraham
Wednesday 1 October 2014 by Libadmin2014

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-07-0 / ISSN 1314-2704, June 19-25, 2014, Book 1, Vol. 1, 703-710 pp

ABSTRACT
The rheology of aqueous solutions of polyelectrolyte( polyanionic cellulose, PAC) at high molecular weight was investigated using a controlled stress rheometer. Several rheological measurements: viscosity measurements, creep tests at a constant low shear stress and oscillation experiments have been performed. The concentrations ranged by weight from 0.15 to 1.2% of PAC. It was found that the aqueous solutions of PAC do not exhibit a yield stress, the flow curves of PAC over a wide range of shear rate (0 to 1000 s-1) could be described by the power law and the Wiliamson models. The dynamic moduli, i.e., storage modulus (G’) and loss modulus (G’’) of the polymer have been determined at frequency sweep from 0.01 to 10 Hz. At polymer concentration above 1%, the modulus G’ is superior to G’’ for high frequencies. The creep-recovery experiments demonstrated that polymer solutions show important viscoelastic properties of system water-PAC when the concentration of the polymer increases.

Keywords:Polyanionic cellulose, viscosity, creep, oscillation