NDLI: The mechanism of fluidization of concentrated calcium carbonate slurries by poly(oxyethylene) diphosphonates

Content Provider	Springer Nature Link
Author	Mosquet, M. Chevalier, Y. Le Perchec, P. Foissy, A. Guicquero, J. P.
Copyright Year	1999
Abstract	Nonionic poly(oxyethylene) polymers having a diphosphonate group at one chain end strongly adsorb onto CaCO3 particles. The main consequence is a considerable lowering of the viscosity of concentrated slurries. This effect occurs because of the break up and redispersion of aggregates of flocculated CaCO3 particles by the polymer adsorption. The mechanism of colloidal stabilization is steric, the particles becoming uncharged as the polymer adsorbs at their surface. As a consequence, the colloidal suspensions remain stable and fluid at high volume fractions and at high ionic strengths. On the other hand, because of the strong affinity of these polymers for CaCO3 surfaces, the larger part of the polymer is adsorbed until the coverage of the particles reaches completion. The easy to handle polymer-to-solid weight ratio can then be used as a formulation parameter. The depletion flocculation by the nonadsorbed polymer is avoided.
Starting Page	1162
Ending Page	1171
Page Count	10
File Format	PDF
ISSN	0303402X
Journal	Colloid and Polymer Science
Volume Number	277
Issue Number	12
e-ISSN	14351536
Language	English
Publisher	Springer-Verlag
Publisher Date	1999-12-02
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Colloid and Surface Chemistry Materials Chemistry Physical and Theoretical Chemistry Polymers and Plastics

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