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Polymerization of Methacrylamide Initiated by Potassium Permanganate/Glycollic Acid Redox System

The kinetics of potassium permanganate/glycollic acid redox pair initiated polymerization of methacrylamide has been investigated under nitrogen atmosphere at 35±1°C. The rate of polymerization with respect to methacrylamide shows square dependence and the order with respect to potassium permanganate has been found to be half. The initial rate of polymerization is almost independent of the concentration of glycollic acid but the maximum conversion shows a decreasing trend. Variation in pH during the change in the concentration of glycollic acid has also been found to be an important factor in controlling the rate of polymerization. The overall energy of activation ΔE has been found to be 73±2 kJ mol−1. The viscometric average molecular weight increases in proportional to increase in the concentration of methacrylamide and decreases inversely to the square root concentration of permanganate. On the basis of experimental results a tentative mechanism has been proposed.