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A mathematical model of emulsion copolymerization reaction of styrene and butyl acrylate for batch and semi-batch isothermal reactor was developed and presented good results when compared to experiments available in the scientific literature. The model included the solution of the population balance for both particle size distribution and average number of radicals per particle. The balances of moments of the molecular weight distribution are solved to obtain the weightand numberaveraged molecular weight of the polymer. The problem described was solved by numerical solution of a set of algebraic-differential equations and the population balance was solved by the method of fixed pivots. The model prediction were validated with a set of experiments with respect to the changes of monomer conversion, average particle diameter, number of particles per liter of emulsion, average number of radicals per particle, particle size distribution, numberand weight-average molecular weight during process time.

Modelagem matemática de copolimerização em emulsão de acrilato de butila e estireno para determinação dos valores médios de peso molecular e distribuição de tamanho de partículas.