Ionic Selectivity of Polyelectrolytes in Salt Free Solutions

Centre de Recherches sur les Macromolecules Vegetables (C.N.R.S.), Domaine Universitaire, B.P. 53, 38041 Grenoble, France [Pg.31]

Abstract. Experimental data concerning the ionic selectivity in carboxylic polyelectrolyte systems are given and discussed. [Pg.31]

A polyelectrolyte can be utilized as a model to investigate the mechanism of ion selectivity of ion exchangers. The ion selectivity exhibited by polyelectrolytes is therefore an important property for practical applications. Our work deals specifically with polycarboxylic polyelectrolytes in salt free aqueous solutions. In the first part, the activities of monovalent and divalent counterions are determined and discussed in connection with the nature of the counterion and polyelectrolyte charge density. Then, experimental results are presented showing clearly the existence of selectivity and affinity sequences. [Pg.31]

Finally the behaviour of polyelectrolytes as a function of their charge density is discussed in connection with ion pair formation. All the experimental results were obtained on carboxymethylcelluloses with various degrees of substitution these polyelectrolytes are assumed to be rigid and their properties are interpreted as a function of the linear charge density. [Pg.31]

A polyelectrolyte is well characterized by its charge parameter X introduced by Lifson and Katchalsky [1]. [Pg.31]

Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...