Abstract
Abstract The pair of cobaltous chloride with N,N-dimethylaniline has been investigated as an initiator for the polymerization of acrylamide in aqueous media at 30, 40, and 50°C in a nitrogen atmosphere. The rate of polymerization was found to be propor-tional to the [monomer]1,08 over the range 0.5-2.0 × 10−2 mol/L. The reaction order related to the cobaltous chloride concentration was 0.53, which indicates a bimolecular mechanism for the termination reaction in the range of 0.2-2.0 × 10−4 mol/L. The rate of polymerization and the maximum conversion fell as the temperature rose above 40°C. The apparent activation energy was 9.38 kcal/mol in the temperature range of 30-50°C. Methanol decreased the rate of polymerization, and polymerization was completely stopped when benzoquinone was added during an induction period. A reaction mechanism is proposed on the basis of the experimental data.
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