Abstract
To increase the efficiency of anion exchangers based on a copolymer of styrene and divinylbenzene, a new method of covalent attachment of quaternary ammonium functional groups of various hydrophilicity that uses 1,4-butanediol diglycidyl ether to increase their spatial distance from the matrix has been suggested. Synthesis includes acylation of the matrix with acetic anhydride, reductive amination, alkylation of the aminated phase with 1,4-butanediol diglycidyl ether, and amination with trimethylamine and dimethylethanolamine of terminal oxirane ring. The use of dimethylamine and methylamine hydrochlorides for the reductive amination makes it possible to obtain a linear or branched structure of the ion exchange layer, respectively. The obtained anion exchangers make it possible to determine 7 inorganic anions simultaneously (F−, Cl−, NO −2 , Br−, NO −3 , SO 2−4 , and PO 3−4 ) in suppression ion chromatography mode, and the anion exchanger with the branched structure and hydrophilic functional group has demonstrated the highest efficiency (31000 and 35000 theoretical plates/m in relation to Br− and NO −2 , respectively).
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Original Russian Text © A.S. Uzhel, O.I. Shchukina, A.V. Zatirakha, A.D. Smolenkov, O.A. Shpigun, 2015, published in Vestnik Moskovskogo Universiteta. Khimiya, 2015, No. 1, pp. 23–33.
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Uzhel, A.S., Shchukina, O.I., Zatirakha, A.V. et al. New polymeric sorbents with increased hydrophilicity for ionic chromatography. Moscow Univ. Chem. Bull. 70, 19–27 (2015). https://doi.org/10.3103/S0027131415010083
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DOI: https://doi.org/10.3103/S0027131415010083