THE INFLUENCE OF MULTIVALENT CATIONS ON NEGATIVE THIXOTROPY IN AQUEOUS GLYCEROL SOLUTIONS OF PARTIALLY HYDROLYZED POLYACRYLAMIDE

Authors
BRADNA B QUADRAT O TITKOVA L DUPUIS D
Citation
B. Bradna et al., THE INFLUENCE OF MULTIVALENT CATIONS ON NEGATIVE THIXOTROPY IN AQUEOUS GLYCEROL SOLUTIONS OF PARTIALLY HYDROLYZED POLYACRYLAMIDE, Acta polymerica, 48(10), 1997, pp. 446-449
Citations number
10
Categorie Soggetti
Polymer Sciences
Journal title
Acta polymerica → ACNP
ISSN journal
03237648
Volume
48
Issue
10
Year of publication
1997
Pages
446 - 449
Database
ISI
SICI code
0323-7648(1997)48:10<446:TIOMCO>2.0.ZU;2-E
Abstract
Negative thixotropic behavior in aqueous glycerol solutions of partial ly hydrolyzed polyacrylamide was studied at various concentrations of Na+, Ca2+ and Al3+ chlorides. A decrease in critical shear stresses an d more intensive negative thixotropic behavior observed in the presenc e of multivalent cations were explained in terms of their stronger cha rge screening effect. This effect suppresses intermolecular electrosta tic repulsions. which act against association of polymer molecules and , thus, against the occurrence of negative thixotropy.