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A semicontinuous emulsion copolymerization of butyl methacrylate and butyl acrylate was investigated. Under the conditions used, the polymerization rate was determined by the rate of feeding of monomers. At a steady state, when the ratio of free monomers in the reactor remained constant, the reactivity ratios r1 = 2.21 and r2 = 0.27 were found. These reactivity ratios were compared with those calculated from published Q‐e values.
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Jaromír Šňpárek (1972) studied this question.
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