Foaming behavior and mechanical properties of microcellular PP/SiO2 composites / W. Gong in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 2 (05/2012)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVII, N° 2 (05/2012) . - p. 181-186 Titre : Foaming behavior and mechanical properties of microcellular PP/SiO2 composites Type de document : texte imprimé Auteurs : W. Gong, Auteur ; K. J. Liu, Auteur ; C. Zhang, Auteur ; J. H. Zhu, Auteur ; L. He, Auteur Année de publication : 2012 Article en page(s) : p. 181-186 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Dioxyde de silicium Matériaux hybrides Mousses plastiques -- Propriétés mécaniques Nanoparticules Polypropylène Index. décimale : 668.9 Polymères Résumé : Microcellular foamed polypropylene (PP)/SiO2composites were prepared by using micro-SiO2and nano-SiO2particles. The effects of the particle size of SiO2on the foaming behavior and mechanical properties of the composites were studied based on heterogeneous nucleation theory. The results showed that the silica facilitated the cell nucleation to some extent. The average cell size of 16.3 µm and the cell density of 4.46 × 107cells/cm3were achieved for the composite foam at the silica content of 4 wt.%. The plastic deformation of the PP was strongly constrained due to the presence of the nano-silica. The tensile and impact strength of the nano-SiO2composite foam are larger than those of the micro-SiO2composite foam due to the high crack propagation resistance in the microcellular PP/nano-SiO2composite. Note de contenu : - EXPERIMENT : Materials - Preparation of PP/SiO2 masterbatch - Preparation of microcellular PP composites - Characterisation - Mechanical measurement - RESULTS AND DISCUSSION : Cell nucleation behavior of PP/SiO2 composites - Foaming behavior of PP/SiO2 composite - Effect of specific surface area on the foaming behavior of microcellular PP/SiO2 composite - Effect of the crystallization behavior on the foaming behavior of microcellular PP/SiO2 composite - Effect of SiO2 particle size on the cell structure of microcellular PP/SiO2 composite - Effect of SiO2 particle size on the mechanical properties in microcellular PP/SiO2 composite DOI : 10.3139/217.2458 En ligne : https://drive.google.com/file/d/19IHnKv4qmPGhf7pVIZhPWqe8Ad1voSRa/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=14593 [article]

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Modeling and characterization of the relationship between cell size and mechanical behavior of microcellular PP/mica composites / W. Gong in INTERNATIONAL POLYMER PROCESSING, Vol. XXV, N° 4 (09/2010)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXV, N° 4 (09/2010) . - p. 270-274 Titre : Modeling and characterization of the relationship between cell size and mechanical behavior of microcellular PP/mica composites Type de document : texte imprimé Auteurs : W. Gong, Auteur ; J. C. Gao, Auteur ; M. Jiang, Auteur ; J. Yu, Auteur ; L. He, Auteur Année de publication : 2010 Article en page(s) : p. 270-274 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Composites -- Propriétés mécaniques Mica Mousses plastiques -- Propriétés mécaniques Polypropylène Index. décimale : 668.9 Polymères Résumé : The microcellular foamed polypropylene (PP)/mica composites were prepared through chemical microcellular injection to investigate the relationship between the mechanical behavior and the cell size. The mechanical behavior model of the microcellular foams is built based on the elastic stress/strain field. The mechanical behavior of the microcellular composites coincides well with the theoretical model. Under loading the large and non uniform cells are in a state of plane strain, which leads to low tensile and impact strengths, whereas small and uniform cells are in a state of plane stress, which contributes to the transition from brittle to tough fracture behavior in the microcellular PP/mica composite. DOI : 10.3139/217.2339 En ligne : https://drive.google.com/file/d/1Kd32PgdddqcamxdgPUkmThuPcSsqVZBe/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9823 [article]

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