Abstract
Abstract The emulsion copolymerization of styrene (St) and butyl acrylate (BA) was studied in two polymerization systems with different initiators. In System I a water-soluble initiator (K2S2O8/Na2S2O4 · 2H2O) was used. System II contained hydroperoxidic groups bound to water-insoluble oxidized polypropylene (OPP) powder in combination with the Fe2+/ethylenediaminetetraacetic acid activator. The influence of the initiator type on the overall rate of copolymerization, reactivity ratios, and on the molecular-weight characteristics of St/BA copolymers was studied. The reactivity ratios were r st = 0.72, r BA = 0.27 for System I; and r st = 0.79, r BA = 0.12 for System II. It was found that the presence of initiation centers on the surface of OPP in System II was responsible for the lower values of the overall rates of polymerization. However, the molecular weights of St/BA copolymers were much higher in System II than in System I with the water-soluble initiator.
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