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M. K. Beklemishev, I. V. Nikolaev, L. Yu. Belyaeva

Radical Polymerization Reactions as Indicators for the Determination of Organic Compounds


Polymerization of methyl methacrylate (MMA) or 4-vinylpyridine (VP) was conducted in an aqueous solution in the presence of tetramethylethylenediamine (TEMED) persulfate initiating system. The reaction rate was monitored turbidimetrically by the polymer suspension formation with and without 26 model organic compounds. Less number of the compounds inhibit the polymerization of VP (9 compounds) than that of MMA (22 compounds) which signifies better selectivity of the first reaction; at the same time, the determination of the model compounds by the MMA polymerization reaction is more sensitive. This was explained by a lower chain growth rate constant for VP vs. MMA and a difference in the stationary concentrations of radicals. Some closely related compounds can be discriminated, e.g., 1,4-benzoquinone from 9,10-anthraquinone (using the MMA reaction) and di- or trinitrophenol from phenol or 4 nitrophenol (using the VP reaction). Determination of ascorbic acid in a pharmaceutical formulation has been performed.
Moscow University Chemistry Bulletin.
2007, Vol. 48, No. 6, P. 407

Copyright (C) Chemistry Dept., Moscow State University, 2002
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