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The kinetics of the polymerization of N-vinyl-2-pyrrolidone by peroxodisulfate ion in aqueous solution in the presence and absence of metal ions Ag+ and Cuz+ is studied. The rate laws for the polymerization are established and the kp/k:'2 values computed. A negative salt effect is observed for the Ag+ catalysed process, indicating the formation of a complex of the type AgS,O, (a@. Cuz+ ions, however, are found to reduce the rate of polymerization.

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Polymerization of the symmetrical nonconjugated diolefin, N,N′‐methylene bisacrylamide, was carried out using peroxodisulphate ion ‐Fe2+ as redox initiator. The rate of polymerization is found to depend on [M]3/2 and [S2O82−]1/2 and independent of [Fe2+] over a range. A polymerization mechanism involving cyclopolymerization in the propagation step is suggested. Evidence in favor of the cyclopolymerization mechanism is discussed. Evaluation of the rate parameters indicates that the deactivation of the primary radical SO4− by Fe2+ ion is a factor to be reckoned with.