Aqueous Polymerization of Methyl Methacrylate Initiated by the Bromate-Thiourea Redox System |
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| Authors: | Deba D Dash Trijama R Mohanty Padma L Nayak |
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| Institution: | Laboratory of Polymers and Fibers, Department of Chemistry , Ravenshaw College , Cuttack, 3, Orissa, India |
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| Abstract: | The aqueous polymerization of methyl methacrylate initiated by the bromate-thiourea redox system in dilute HC1 has been investigated under nitrogen atmosphere. The rate of polymerization increases with increasing concentration of thiourea in the range 5 × 10?3?10 × 10?3 M. The percentage of conversion increases with increasing concentration of the catalyst, but beyond 1.5 × 10?2 M, there is a decreasing trend in the rate of polymerization. The rate of polymerization increases with increasing monomer concentration, but beyond 0.184 M the polymerization rate decreases due to gel effect. The rate of polymerization increases with temperature up to 35°C and beyond 40°C a decreasing trend is noticed. The effect of water miscible organic solvents, certain neutral salts on the rate of polymerization has also been investigated. |
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