Etude expérimentale et modélisation du procédé continu ensemencé de copolymérisation en dispersion du système styrène/acrylonitrile en milieu polyol

Abstract : The aim of this work is to study and model the continuous seeded dispersion copolymerization of acrylonitrile with styrene in polyol medium : the influence of the process conditions on the physical properties of the copolymer polyols produced is investigated in order to better understand the different mechanisms involved and to develop a tendency model for the whole process. The first part deals with the experimental study of the process. The influence of the styrene to acrylonitrile ratio, the temperature and the concentrations of the chain transfer agent, the initiator, and the precursor stabilizer, on the physical properties of copolymer polyols are studied. This allows to understand better the relationships between the molecular weight distributions, the grafting level, the viscosity, the particle size distributions, and the locus of polymerization. This study shows also the complexity of the phenomena involved in the particle stabilization. The second part presents the modelling of the overall process and the identification of the parameters of this model. Indeed, a model intended to forecast the average molecular weights, the conversions and the grafting level in the copolymer polyols is developed in spite of the process complexity and the lack of accuracy of some of the measurements. An evolutionary algorithm allows then, with a consequent number of experiments realized, to identify the unknown parameters of this model. A preliminary validation of the work is presented and helps to define the ways to go further with this research
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Theses
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http://docnum.univ-lorraine.fr/prive/INPL_T_2004_SALVADOR_B.pdf
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https://hal.univ-lorraine.fr/tel-01752316
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Submitted on : Thursday, March 29, 2018 - 1:40:53 PM
Last modification on : Thursday, January 31, 2019 - 1:27:49 AM

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Bruno Salvador. Etude expérimentale et modélisation du procédé continu ensemencé de copolymérisation en dispersion du système styrène/acrylonitrile en milieu polyol. Autre. Institut National Polytechnique de Lorraine, 2004. Français. ⟨NNT : 2004INPL041N⟩. ⟨tel-01752316⟩

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