Kinetics and Mechanism of Potassium Persulphate/L-Serine Initiated Polymerization of Methylmethacrylate |
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Authors: | Ali Akbar Mirzaei Massoud Kaykhaii |
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Affiliation: | (1) Department of Chemistry, Faculty of Sciences, Sistan and Baluchestan University, Zahedan, 98135-674, Iran |
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Abstract: | The polymerization kinetics of methyl methacrylate with K2S2O8/L-serine redox system has been investigated volumetrically at 35±0.1°C under nitrogen atmosphere acidic aqueous medium in DMF/H2O mixture (50% v/v). The rates of polymerization were measured varying concentrations of the monomer, initiator, L-serine as well as temperature; and it was found to increase with increasing of both temperature and concentrations of monomer, initiator, and L-serine. The overall energy of activation (Ea) has been calculated to be 29.48 kJ/mol from the Arrhenius plot in temperature range 25–50°C. The molecular weight of the polymer was determined by gel permeation chromatography (GPC). Based on kinetic studies and depending on the results obtained, a suitable reaction mechanism has been suggested and the rates of polymerization found to obey the following equation: Vp[methyl methacrylate]1.09[L-serine]1.03[K2S2O8]0.96. |
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Keywords: | activation energy initiators kinetics (polym.) radical polymerization |
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