Abstract
The kinetics of aqueous polymerization of acrylonitrile initiated by peroxomonosulphate Co(II) redox system have been investigated in the range 30–50°C under nitrogen at a fixed ionic strength of 0.30 mol · dm −3. The overall rate of polymerization, followed gravimetrically, was found to be proportional to [AN] 1.5[PMS] 1.0[Co(II)] 0.5. The activation energy was found to be 42 kJ · mol −1. An increase in ionic strength slightly decreased the rate of polymerization. Inhibition of polymerization was caused by the addition of sulphuric acid in the range of 0.05-0.50 mol · dm −3. The rate law for polymerization was fitted to a reaction mechanism involving all possible initiation reactions and termination by mutual combination.
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