Abstract
The synthesis of acrylic weak base anion exchangers by the aminolysis reactions of ethylacrylate:acrylonitrile:divinylbenzene copolymers with ethylenediamine or triethylene-tetramine was performed. The resins were characterized by the density (Ww), volume and weight exchange capacities (Cv and Cwt, respectively). Also, the chemical stability of the synthesized anion exchangers in aggressive media, such as H2O2; NaOCl; NaOCl+NaOH; NaOCl+FeSO4 was studied. The results are compared with those obtained for a commercial acrylic base anion exchanger, Purolite A-830. The most aggressive agent, which causes a serious degradation for all anion exchangers, is an aqueous solution of NaOCl, alone or in the mixture with 5 N NaOH or FeSO4. The acrylic weak base anion exchangers with permanent porosity have a higher resistance than those with the porosity in the swollen state. The resins with ethylenediamine functional groups have the highest chemical stability in the studied aggressive media.
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