Bulletin of
Vitebsk State
Technological
University

Abstract

In order to develop a technology for producing fibrous ion exchangers, model samples of ionogenic copolymers of acrylonitrile (AN) and 2-acrylamide-2-methylpropanesulfonic acid (AMPS) in dimethyl sulfoxide (DMSO) were synthesized with an acid monomer (AC) content in the reaction mixture (RM) of 0, 20, 25, 30 and 40 % (from the mass of monomers) and ion exchange materials were obtained on their basis. The kinetic and macrokinetic parameters of the free-radical process of synthesis of AN and AMPS copolymers (with an AMPS content of up to 30 % (of the monomer weight in RМ) at a temperature of 75 °C were estimated. The values of their intrinsic viscosity were determined. It was shown that the content of АC in the initial reaction mixture did not significantly affect the molecular weight characteristics of the obtained copolymers.

The ability of poly[AN–co–AMPS] synthesized with an AMPS content of 25, 30, and 40 % (from the mass of monomers) in RM to sorb ions of s- and d-metals from 0.1 N sorbate solutions was estimated and compared. Zinc, magnesium, nickel, and calcium salts were used as such. The effect of superequivalent sorption of ions of the studied metals was determined, which was manifested to the maximum extent in the case of Zn²⁺ and Mg²⁺ ions. It is assumed that it may be caused by the interaction of metal ions with nitrogen-containing groups of the fiber-forming ionogenic copolymer AN and AMPS by the donor-acceptor mechanism. The obtained data allow us to consider the possibility of creating highly effective fibrous sorbents based on poly[AN–co– AMPS].

Preparation and study of the properties of poly[acrylonitrile–co–2-acrylamide-2- methylpropanesulfonic acid] as a polymer base for fibrous ion-exchange materials