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Conception, modélisation et optimisation d'un procédé continu d'élaboration d'une dispersion stabilisée de particules de polystyrène dans un polyéther polyol

Abstract : This study dealt with the development and the optimization of a new continuous process for making stable dispersions of polystyrene particles in a polyether polyol. The objective was to maximize the solid mass fraction in the mixture and to minimize the mean particles diameter, by maintaining stable dispersion. The bibliographical research showed the importance of the stabilizer and the operating conditions choices. Preliminary studies carried out in a batch reactor with different stabilizers led to select a polystyrene grafted polyol. A complete study of the synthesis of this stabilizer was carried out and transposed on a pilot scale.For to the continuous process, a complete pilot unit was built around a twin screw extruder. Once the operating conditions were optimized, two influencing parameters were identified (rate of stabilizer and concentration of polystyrene), thus an experimental design was developed. A simple model was created in order to determine the relationships between operating conditions and dispersion's quality. The use of multicriteria optimization process allowed determining the best compromises for making stable dispersions.
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Georges Kanaan. Conception, modélisation et optimisation d'un procédé continu d'élaboration d'une dispersion stabilisée de particules de polystyrène dans un polyéther polyol. Autre. Institut National Polytechnique de Lorraine, 2007. Français. ⟨NNT : 2007INPL073N⟩. ⟨tel-01749515⟩

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