Mathematical modeling of emulsion copolymerization process of butyl acrylate and vynil acetate. / Modelagem matemática do processo de copolimerização em emulsão de acrilato de butila e acetato de vinila.

AUTOR(ES)

Marcelo Fábio Leonardo

FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

05/04/2011

RESUMO

Polimeric materials have been largely used and, today, more stringent specifications have been imposed to these materials for special applications. In general, microstructure exercises intense influence on the macroscopic properties of the polymer: therefore, the control of the microstructure and its relation with these properties is of strategic interest. Mathematical models of the polymerization processes are important tools to predict the effect of process variables with the process productivity and the polymer microstructure. In this work a mathematical model of the emulsion copolymerization process of butyl acrylate and vinyl acetate was elaborated. The resulting model is a system of DAE (differential algebraic equations) and was solved numerically using the function ode113 of the software MATLAB6.5R13, employing both BDF (backward differentiation formulas) and NDF (numerical differentiation formulas) methods. The results show that the model is able to represent reasonably well the experimental data taken from previous works of the research group, although one of the three identification parameters had been adjusted to values lower than those reported in the literature. Nevertheless, the model is functional and can be useful for process simulation. Polynomial curves of temperature versus time variations were also studied for optimizing the polynomial coefficients, seeking the improvement (reduction) of the reaction time. However, it was observed that DAE implementation is complicated and demands further careful procedures for generating consistent initialization conditions for attributing good initial values for the model parameters, presenting difficulties in the model identification step.

ASSUNTO(S)

emulsion modelagem modeling process processo copolimerização copolymerization emulsão

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