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Viscosimetric Constants of Suspensions of Clay-Polymer Complexes

Published online by Cambridge University Press:  01 January 2024

H. v. H. van der Watt  and
G. B. Bodman
H. v. H. van der Watt
Affiliation:
University of California, Berkeley, USA Agricultural Research Institute, University of Pretoria, Pretoria, South Africa
G. B. Bodman
Affiliation:
University of California, Berkeley, USA Department of Soils and Plant Nutrition, University of California, Berkeley 4, California, USA
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Abstract

The viscosimetric constants of aqueous suspensions of certain homoionic forms of mont-morillonite and attapulgite were measured following adsorption of different kinds and quantities of organic polymers. Dissymmetry and interaction of the clay—organic complexes were then calculated from the Schulz-Blaschke equation and their structures deduced.

A positive, linear relationship was found between the dissymmetry of H- and Al-montmorillonite, respectively, and the amount of vinyl acetate maleic anhydride (VAMA) adsorbed-H-montmorillonite displayed the greater dissymmetry and it is inferred that H-montmoril. lonite complexes consist of an edge-to-edge linkage of clay particles through lattice-aluminumcarboxyl bonds. Al-montmorillonite permits three kinds of linkage: edge-to-edge (as with H-montmorillonite), external flat surface-to-surface (producing a “stacked” structure), and surface-to-edge, the last two involving exchangeable aluminum-carboxyl bonds. Edge-to-edge linkages probably predominate.

Ca-montmorillonite is unaffected by less than 8 parts of VAMA per thousand of clay. Edge-to-edge linked clay particles appear at this ratio and interaction diminishes. Delayed structural organization can be explained by low polymer adsorption at high initial pH. Maximum dissymmetry of H-montmorillonite-VAMA complexes occurred after titration with NaOH to pH between 6 and 8, above which mutual repulsion between highly dissociated polymer and clay may restrict linkage.

H-attapulgite—VAMA complexes are dissymmetrical for low VAMA adsorption but increased adsorption reduces dissymmetry and bundles of edge-to-edge linked particles are formed.

Probable structures of montmorillonite complexes with other polymers are also discussed.

Type
Symposium on Clay—Organic Complexes
Information
Clays and Clay Minerals (National Conference on Clays and Clay Minerals) , Volume 9 , February 1960 , pp. 568 - 584
Copyright
Copyright © The Clay Minerals Society 1960

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