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Aqueous polymerisation of Methyl methacrylate initiated by Titanium (III)- salicylaldoxime redox system: A kinetic study

Yashoda, M P and Sherigara, B S and Nayak , P V (2000) Aqueous polymerisation of Methyl methacrylate initiated by Titanium (III)- salicylaldoxime redox system: A kinetic study. Journal of Macromolecular Science Part A : Pure and applied Chemistry, 37 A (11). pp. 1487-1505. ISSN 1060-1325

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Abstract

The polymerization of methyl methacrylate initiated by the titanium(III)-salicylaldoxime redox system was studied in an aqueous sulfuric acid-ethanol medium in the temperature range of 20-30°C. The rates of polymerization were investigated at various concentrations of reductant, oxidant, ethanol, sulfuric acid, and monomer. Cyclic voltammetric sensing of salicylaldoxime kinetic conditions demonstrated its reduction behavior. From the results obtained, it was inferred that the polymerization reaction was initiated by an organic free radical arising from the titanium(III)-salicylaldoxime redox system and termination took place predominantly by mutual coupling and small fraction by chain transfer mechanism involving solvent molecules. The effects of some water-miscible organic solvents and surfactants on the rate of polymerization were investigated. The temperature dependence of the rate was studied and the activation parameters were computed using Arrhenius and Eyring plots. A suitable kinetic scheme has been proposed on the basis of experimental observations

Item Type: Article
Uncontrolled Keywords: Aqueous polymerisation, Cyclic voltametry, kinetics
Subjects: Engineering > MIT Manipal > Chemistry
Depositing User: MIT Library
Date Deposited: 21 Aug 2013 06:17
Last Modified: 05 Sep 2013 09:25
URI: http://eprints.manipal.edu/id/eprint/136841

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