Molar mass selectivity in the adsorption of polyacrylates on calcite

被引:49
作者
Geffroy, C
Persello, J
Foissy, A
Lixon, P
Tournilhac, F
Cabane, B
机构
[1] Univ Franche Comte, Lab Electrochim & Syst Microdisperses, F-25030 Besancon, France
[2] CEA Saclay, Serv Chim Mol, Equipe Mixte CEARP, F-91191 Gif Sur Yvette, France
关键词
adsorption; fractionation; polyelectrolyte; soluble mineral; size exclusion chromatography;
D O I
10.1016/S0927-7757(99)00189-2
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Aqueous solutions of polyacrylates, with a wide molar mass distribution, have been equilibrated with aqueous dispersions of calcium carbonate particles. In mixtures with excess polyacrylates, it is found that only a fraction of the original collection of macromolecules adsorbs on the mineral surfaces. The adsorbed macromolecules have been recovered, and their molar mass distribution has been measured using size exclusion chromatography (SEC). It is found that a narrow fraction with intermediate molar mass is preferentially adsorbed. This selection results from a kinetic process where these macromolecules are the first to bind to the surface. Smaller macromolecules do not bind at all and larger ones could bind, but are repelled by the macromolecules that arrived first at the surface. (C) 2000 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:107 / 121
页数:15
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