Abstract
AbstractThe kinetics of aqueous polymerization of N‐vinylpyrrolidone (N‐VP) was carried out using potassium peroxidiphosphate–Ag+ system under nitrogen atmosphere at 25°C. The rate of polymerization was directly proportional to the concentration of the N‐vinylpyrrolidone and showed a half‐order with respect to the concentration of the peroxidiphosphate (H2P2O) and Ag+ ions. The value of κp/(κt)1/2 was computed and its value found to increase on increasing the temperature of the reaction mixture. The energy of activation (Ea) was found to be 65.8 ± 0.1 kJ mol−1 within the temperature range from 20 to 50°C. Viscometric average molecular weight of polyvinylpyrrolidone was determined by measuring intrinsic viscosity of the polymer samples collected at different kinetic conditions. The effect of various additives was also studied. A suitable mechanism of polymerization has been proposed and a reaction rate law was derived considering experimental results. © 1994 John Wiley & Sons, Inc.
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