Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5211190 | Reactive and Functional Polymers | 2008 | 11 Pages |
Abstract
In this study, four cationic latexes containing n-hexadecyl, n-octyl, or a methyl group as one of the alkyls on their quaternary ammonium ions were synthesized and used as supports for o-iodosobenzoate (IBA) catalyst in the hydrolysis of p-nitrophenyl diphenyl phosphate (PNPDPP). The quaternary ammonium ions of the latexes were utilized to bind IBA anion electrostatically. In the kinetics of the hydrolysis of PNPDPP, first-order rate constants (kobsd) of the reaction were determined by varying the type of latex, its amount, and the concentration of IBA at pH 7.0, 8.0, and 9.0 at 25 °C. Thereafter, the second-order rate constants (kcat) were calculated for some of the reactions. Changing one of the alkyl groups of the quaternary ammonium ions of the latexes in the order of methyl, n-octyl, and n-hexadecyl yielded higher catalytic activities. For the most active IBA/latex catalyst, kobsd and kcat values were determined to be 3.28 Ã 10â2 sâ1 and 652 Mâ1 sâ1 at pH 9.0 and 25 °C for the PNPDPP hydrolysis, respectively.
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Physical Sciences and Engineering
Chemistry
Organic Chemistry
Authors
Murat Erdem, Hayrettin Türk,