๐”– Bobbio Scriptorium
โœฆ   LIBER   โœฆ

The influence of multivalent cations on negative thixotropy in aqueous glycerol solutions of partially hydrolyzed polyacrylamide

โœ Scribed by B. Bradna; O. Quadrat; L. Titkova; D. Dupuis

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
289 KB
Volume
48
Category
Article
ISSN
0323-7648

No coin nor oath required. For personal study only.

โœฆ Synopsis

Abstract

Negative thixotropic behavior in aqueous glycerol solutions of partially hydrolyzed polyacrylamide was studied at various concentrations of Na^+^, Ca^2+^ and Al^3+^ chlorides. A decrease in critical shear stresses and more intensive negative thixotropic behavior observed in the presence of multivalent cations were explained in terms of their stronger charge screening effect. This effect suppresses intermolecular electrostatic repulsions, which act against association of polymer molecules and, thus, against the occurrence of negative thixotropy.

๐Ÿ“œ SIMILAR VOLUMES

Conformation of Polyelectrolyte Chains i
Conformation of Polyelectrolyte Chains in Dilute Aqueous Solutions Investigated by Conductometry, 3. Influence of Charge Density on the Conformation of Partly Alkylated Poly(N-ethyl-4-vinylpyridinium) Cations and Ionenes
โœ Olga V. Davydova; Alexander N. Zelikin; Sergei I. Kargov; Vladimir A. Izumrudov ๐Ÿ“‚ Article ๐Ÿ“… 2002 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 307 KB ๐Ÿ‘ 2 views

Temperature dependence of the mean charge spacing b, for PEVP-b samples, DP = 100, with different degrees of alkylation: b = 30 (1), 40 (2), 60 (3), 70 (4), and 95 (5)