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

Authors : Kalappa PRASHANTHA, Karkala Vasanth Kumar PAI

Pages : 99-110

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Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :The polymerization of 2-hydroxyethylmethacrylate insert ignore into journalissuearticles values(HEMA); initiated by the redox system titaniuminsert ignore into journalissuearticles values(III);-dimethyl glyoxime insert ignore into journalissuearticles values(DMG); was studied in dimethyl formamide insert ignore into journalissuearticles values(DMF);-water insert ignore into journalissuearticles values(80:20 v/v); medium in the temperature range 290-310 K. The rate of polymerization insert ignore into journalissuearticles values(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 titaniuminsert ignore into journalissuearticles values(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 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 is proposed on the basis of experimental observations.
Keywords : Poly 2 hydoxyethylmethacrylate, Cyclic Voltammetry and Titanium III, Dimethylglyoxime