Polyoxyethylene di-phosphonates as dispersing agents

被引：33

作者：

Chevalier, Y

Brunel, S

LePerchec, P

Mosquet, M

Guicquero, JP

机构：

[1] Lab. Mat. Organ. Proprietes S., LMOPS - CNRS, 69390 Vernaison

[2] CHRYSO S.A., ZI Sermaises

[3] Lafarge Coppée Recherche, Laboratoire Central de Recherche

来源：

TRENDS IN COLLOID AND INTERFACE SCIENCE XI | 1997年 / 105卷

关键词：

colloidal aqueous suspensions; adsorption; rheology; polyethylene oxide; phosphonate; calcium carbonate;

D O I：

10.1007/BF01188916

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

New polymeric dispersing agents designed to stabilize and lower the viscosity of aqueous mineral suspensions have been synthesized and studied. These dispersants are made of a non-ionic hydrosoluble polymer (polyethylene oxide) with a functional group (diphosphonate) having a strong affinity for the mineral surfaces attached at one end of the macromolecular chains. This molecular architecture allows a brush-like adsorption at the solid surface which differs from conventional homopolymer dispersants such as polyacrylates. The adsorption of these dispersants onto calcium carbonate as a model mineral and the rheological behavior of concentrated aqueous colloidal dispersions of CaCO2 particles were studied. Strong adsorption by the polymer chain-end provides an enhanced colloidal stability of the suspensions of CaCO3 particles, The addition of the dispersing polymer causes a deaggregation of the initially flocculated CaCO, particles, which results in a drastic reduction of the viscosity of the concentrated suspensions. Thus, the viscosity of a 20 wt% CaCO3 suspension in water at pH = 11 is lowered to 2 mPa s upon the addition of a low concentration of polymer. Comparison with polyacrylate dispersants shows the advantages of such a diblock macromolecular structure with a non-ionic polymeric part at high solid contents and high ionic strengths.

引用

页码：6 / 10

页数：5

共 18 条

[1]

Wedlock D.J., Colloid and Surface Engineering, (1992)

[2]

Napper D.H., Polymeric Stabilization of Colloidal Dispersions, (1983)

[3]

Cohen-Stuart M., Cosgrove T., Vincent B., Adv Colloid Interface Sci, 24, (1986)

[4]

Gennes P.G., Adv Colloid Interface Sci, 27, (1987)

[5]

Fleer G.J., Scheutjens J.M.H.M., Coagulation and Flocculation, (1993)

[6]

Alexander S., J Physique, 38, (1977)

[7]

De Gennes P.G., Macromolecules, 13, (1980)

[8]

Auroy P., Mir Y., Auvray L., Phys Rev Lett, 69, (1992)

[9]

Hadziioannou G., Patel S., Granick S., Tirrell M., J Am Chem Soc, 108, (1986)

[10]

Taunton H.J., Toprakcioglu C., Fetters L.J., Klein J., Nature, 332, (1988)

← 1 2 →