Abstract
AbstractThe polymerization of acrylonitrile initiated by an ascorbic acid–peroxodisulfate redox system was studied in an aqueous solution at 35°C in the presence of air. Molecular oxygen was found to have no effect on the polymerization reaction. An increase in ionic strength slightly increased the rate. The overall rate of polymerization, Rp, showed a square dependence on [monomer] and a half‐order dependence on [peroxodisulfate]. A first‐order dependence on [ascorbic acid] at low concentrations (<3.0 × 10−3 mol L−1) followed by a decrease in Rp at higher concentrations of ascorbic acid (>3.0 × 10−3 mol L−1) was also noted. Rp remained unchanged up to 40°C and showed a decline thereafter. Addition of catalytic amounts of cupric ions decreased the rate whereas ferric ions were found to increase the rate. Added sulfuric acid in the range (6.0−50.0) × 10−5 mol L−1 decreased the Rp.
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