Elaboration de polypropylène ou de polystyrène à l'aide du dioxyde de carbone supercritique : procédé, microstructure, propriétés mécaniques

Abstract : In this work, scCO2 induced foaming of PP or PS is systematically studied with emphasis on the relationship between process, microstructure and mechanical properties. The first part of the thesis deals with the toughening of iPP by scCO2 induced crystallization for the fine separation of rigid crystalline domains and soft amorphous ones in the polymer matrix. The highly oriented iPP with shish-kebab and spherulite are then used for CO2 foaming to investigate the effect of crystalline structure on the formation of cell nucleation and growth. In addition, the effect of the foaming conditions and the cell structural parameters of PS foams on the mechanical properties are studied systematically. PS foams with isotropic cell morphology and oriented cell one are prepared. Finally, a two-step depressurization batch process is developed to produce bi-modal cell structure PS foams by using scCO2 as the blowing agent. This unique cell structure with both small and large cells homogenously distributed throughout the entire volume of the foam sample might have particular properties.
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Jin-Biao Bao. Elaboration de polypropylène ou de polystyrène à l'aide du dioxyde de carbone supercritique : procédé, microstructure, propriétés mécaniques. Autre. Institut National Polytechnique de Lorraine, 2011. Français. ⟨NNT : 2011INPL111N⟩. ⟨tel-01775871⟩

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