Abstract
The kinetics of oxidation of a macromolecule, poly(ethylene glycol) [PEG] by ceric sulphate in sulphuric acid medium has been studied by means of UV-visible spectrophotometer with a view to find out any difference in oxidative behavior of monomeric and polymeric analogue. The observed difference in rates of oxidation has been explained in terms of cage formation. The oxidation of PEG proceeded without the formation of a stable intermediate complex. The order with respect to the concentrations of PEG and ceric sulphate has been found to be one and the overall order is two. The effects of acid concentration, sulphate ion concentration, ionic strength and temperature on the rate of the oxidation reaction have been studied and suitable explanations have been given. The thermodynamic parameters for the oxidation reaction have also been presented. Based on the experimental results, a suitable kinetic expression and a plausible mechanism have been proposed for the oxidation reaction.
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Nagarajan, S., Srinivasan, K. & Venkata Rao, K. Kinetic and Mechanistic Studies on the Oxidation of Poly(ethylene glycol) by Ceric Sulphate in Sulphuric Acid Medium. Polym J 26, 851–857 (1994). https://doi.org/10.1295/polymj.26.851
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DOI: https://doi.org/10.1295/polymj.26.851