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Kinetics of Polymerization of 2-Hydroxyethylmethacrylate Initiated by a Titanium(III)-Dimethylglyoxime Redox System

Prashantha , K and Pai, Vasantha Kumar and Yashoda, M P and Sherigara, B S (2003) Kinetics of Polymerization of 2-Hydroxyethylmethacrylate Initiated by a Titanium(III)-Dimethylglyoxime Redox System. Turkish Journal of Chemistry , 27. pp. 99-110. ISSN 1303-6130

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Abstract

The polymerization of 2-hydroxyethylmethacrylate (HEMA) initiated by the redox system titanium(III)- dimethyl glyoxime (DMG) was studied in dimethyl formamide (DMF)-water (80:20 v/v) medium in the temperature range 290-310 K. The rate of polymerization (Rp) was investigated at various concentrations of reductant, oxidant, sulfuric acid, and monomer. Cyclic voltametric sensing of dimethylglyoxime under the kinetic conditions demonstrated its reduction behavior. From the obtained results, it was inferred that the polymerization reaction was initiated by an organic free radical arising from the titanium(III)- dimethylglyoxime redox system. Chain termination of the polymer took place predominantly by mutual coupling and small fraction by chain transfer mechanism involving solvent molecules. The eff�ects 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 is proposed on the basis of experimental observations.

Item Type: Article
Uncontrolled Keywords: Poly[2-hydoxyethylmethacrylate], Cyclic Voltammetry and Titanium(III)-Dimethylglyoxime
Subjects: Engineering > MIT Manipal > Chemistry
Depositing User: MIT Library
Date Deposited: 21 Aug 2013 06:43
Last Modified: 21 Aug 2013 06:43
URI: http://eprints.manipal.edu/id/eprint/136844

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