Determination of the charge density of acrylamide/acrylate copolymers by tensammetry

Abstract

TRUIS SMITH-PALMER and BYRON R. WENTZELL. Can. J. Chem. 68, 26 (1990). The charge densities of acrylamide/acrylate copolymers can be determined using tensammetry. The tensammograms were run using 20 ppm solutions of polymer in 0.1 M tetraethylammonium chloride. A standard curve of desorption peak height versus mol% anionicity was useful in the range 10-50%. A second standard curve of the potential at which the capacitive current measured 1 pA versus mol% anionicity allowed the determination of charge density in the range 0-15%.

A tensammetric study of the adsorption of cationic polymers and copolymers

“…reported previously for polyacrylamide (9). Thus we can say that the adsorption of these polymers onto a neutral or a negatively or positively charged mercury surface is independent of molecular weight.…”

“…We have previously shown that we can determine the concentration of polyacrylamides and cationic and anionic acrylamide copolymers using both polarographic maximum suppression (8) and tensammetry (6), and that we can use tensammetry to determine the mol% anionicity of anionic acrylamidelacrylate copolymers after complexation with tetraethylammonium chloride (9). In this paper we compare the tensammetric behaviour of various cationic polymers and copolymers in order to study parameters which affect their adsorption at various potentials.…”