Crystallization kinetics for PP/EPDM/Nano-CaCO2 composites - The influence of nanoparticles distribution / L. Gong in INTERNATIONAL POLYMER PROCESSING, Vol. XXX, N° 2 (05/2015)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXX, N° 2 (05/2015) . - p. 217-226 Titre : Crystallization kinetics for PP/EPDM/Nano-CaCO2 composites - The influence of nanoparticles distribution Type de document : texte imprimé Auteurs : L. Gong, Auteur ; B. Yin, Auteur ; L.-P. Li, Auteur ; M.-B. Yang, Auteur Année de publication : 2015 Article en page(s) : p. 217-226 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alliages polymères Carbonate de calcium Le carbonate de calcium (CaCO3) est composé d'un ion carbonate (CO32-) et d'un ion calcium (Ca2+), sa masse molaire est de 100,1 g/mole. C'est le composant principal du calcaire et de la craie, mais également du marbre. C'est aussi le principal constituant des coquilles d'animaux marins, du corail et des escargots. Cinétique chimique Composites Cristallisation Dispersions et suspensions Ethylène-propylène-diène monomère Matières plastiques -- Extrusion Mélanges-maîtres (chimie) Nanoparticules Polypropylène Index. décimale : 668.4 Plastiques, vinyles Résumé : The primary aim of this paper is to provide an insight on the effect of the distribution of calcium carbonate nanoparticles (nano-CaCO3) on the isothermal crystallization kinetics in Polypropylene (PP)/ethylene-propylene-diene terpolymer (EPDM)/nano-CaCO3 composites prepared by different compounding procedures. PP/EPDM/CaCO3 composites were prepared by two compounding procedures (direct compounding: mixed all three solid materials together; multistep compounding: the melted EPDM/CaCO3 master batch in a single screw extruder blended with melted PP in twin-screw extruder via injecting into the twin-screw extruder from a lateral port at the melting section of the twin-screw extruder). Morphological observation showed that abundant CaCO3 particles concentrated around EPDM dispersed phase in the multistep compounding composite, essentially different from the respectively dispersed morphology of CaCO3 particles and EPDM domains in the matrix for the direct compounding composite. Moreover, better dispersion of CaCO3 particles in the multistep compounding composite was observed comparing to the direct compounding composite. Furthermore, a pronounced improvement of the crystallization half time (t1/2), rate of crystallization (G) was achieved in the multistep compounding composite, which may originate from the better dispersion of CaCO3 particles providing larger nucleation density and the collaborative nucleation of EPDM and CaCO3 during the isothermal crystallization. Note de contenu : - EXPERIMENTAL SECTION : Materials - Sample preparation - Two-dimensional wide-angle X ray diffraction (2D-WAXD) - Scanning Electron Microscopy (SEM) - Differential Scanning Calorimetry (DSC) - RESULTS AND DISCUSSION : Morphological observation - Isothermal crystallization DOI : 10.3139/217.2988 En ligne : https://drive.google.com/file/d/1Zp5yDKs8IYgGUErwLFIrv0Finy0vxkMf/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23895 [article]

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Effect of annealing temperature on PP microporous membranes obtaines by a melt-extrusion-stretching method / Z. Y. Liu in INTERNATIONAL POLYMER PROCESSING, Vol. XXXIV, N° 4 (08/2019)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXIV, N° 4 (08/2019) . - p. 467-474 Titre : Effect of annealing temperature on PP microporous membranes obtaines by a melt-extrusion-stretching method Type de document : texte imprimé Auteurs : Z. Y. Liu, Auteur ; X.-T. Wu, Auteur ; J. Yan, Auteur ; W. Yang, Auteur ; M.-B. Yang, Auteur Année de publication : 2019 Article en page(s) : p. 467-474 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Etat fondu (matériaux) Extrusion par étirage Matériaux poreux Membranes (technologie) Polypropylène Index. décimale : 668.9 Polymères Résumé : Isotactic polypropylene (iPP) precursor film with highly oriented lamellar structure was produced through a melt extrusion-annealing-uniaxial stretching (MAUS) process. The precursor films were annealed at various temperatures and the structure evolution of precursor films during various annealing temperatures and the pore formation of the annealed film during stretching were investigated. During annealing, recrystallized lamellar structure was formed to obtain “core-shell sandwich” structure. The thickness of newly formed lamellae increased with annealing temperature, which improved the ability of slipping resistance of the original lamellar structure during stretching. As the annealing temperature of precursor film increased, the micropore shape and diameter of the final membranes became more uniform. The porosity of the microporous membranes increased with increasing annealing temperature. Note de contenu : - EXPERIMENTAL : Material and membrane preparation - Characterization - RESULTS AND DISCUSSION : Effect of annealing temperature on the lamellar structure of the precursor films - Effect of annealing temperature on the tensile deformation behavior of the precursor films - Effect of annealing on the performance of the microporous membranes - Discussion DOI : 10.3139/217.3774 En ligne : https://www.degruyter.com/document/doi/10.3139/217.3774/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33065 [article]

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Fracture toughness of PP/EPDM/nano-ternary composites : the role of distribution of inorganic particles / L. Gong in INTERNATIONAL POLYMER PROCESSING, Vol. XXXI, N° 2 (05/2016)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXI, N° 2 (05/2016) . - p. 224-232 Titre : Fracture toughness of PP/EPDM/nano-ternary composites : the role of distribution of inorganic particles Type de document : texte imprimé Auteurs : L. Gong, Auteur ; S.-H. Chen, Auteur ; W.-M. Hou, Auteur ; B. Yin, Auteur ; L.-P. Li, Auteur ; M.-B. Yang, Auteur Année de publication : 2016 Article en page(s) : p. 224-232 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alliages polymères -- propriétés mécaniques Angle de contact Carbonate de calcium Le carbonate de calcium (CaCO3) est composé d'un ion carbonate (CO32-) et d'un ion calcium (Ca2+), sa masse molaire est de 100,1 g/mole. C'est le composant principal du calcaire et de la craie, mais également du marbre. C'est aussi le principal constituant des coquilles d'animaux marins, du corail et des escargots. Dioxyde de silicium Ethylène-propylène-diène monomère Nanoparticules Polypropylène Résistance au chocs Index. décimale : 668.4 Plastiques, vinyles Résumé : The influence of the distribution of the inorganic particles on the toughness of the PP/EPDM/nano-ternary composites was investigated. Four morphologies for PP/EPDM/nano-ternary composites were obtained by means of adjusting the surface tension of inorganic particles (nano-CaCO3, hydrophobic nano-SiO2 and hydrophilic nano-SiO2) and the compounding sequence (one-step extrusion and two-step extrusion). Morphological observation revealed that the segregated dispersion morphology was formed in the PP/EPDM/CaCO3 composite. For the PP/EPDM/R974 (hydrophobic nano-SiO2) composite, R974 particles were dispersed at the interface between the PP matrix and EPDM dispersed phase. A200 particles (hydrophilic nano-SiO2) continuously dispersed between PP and EPDM phase for PP/EPDM/A200 composites prepared by one-step, while were present in EPDM dispersed phase for the two-step PP/EPDM/A200 composites. The dependence of the toughness on the phase morphology of the components, especially the distribution of nanoparticles, was studied systematically. The impact strength of one-step PP/EPDM/A200 composites was pronouncedly enhanced, increasing 552 % compared to pure PP. Compared with the other three composites, the one-step PP/EPDM/A200 composites exhibits better effect of preventing crack propagation and far higher fracture energies. It is attributed to the A200 particles continuously dispersed between EPDM phase and matrix, which makes EPDM particles have better compatibility with the PP matrix and the overlapping of the stress field with A200 particles. Note de contenu : - EXPERIMENTAL SECTION : Materials - Sample preparation - Scanning electron microscopy (SEM) - Izod impact strength testing - Contact angle measurement - Analysis of the damage zone around the surviving crack tip - Fracture toughness measurements - RESULTS AND DISCUSSION : The control of morphology for PP/EPDM/nanoternary composites - Izod impact strength - Investigation of the fracture and toughening mechanisms - The role of nano-particles distribution on the impact toughness DOI : 10.3139/217.3174 En ligne : https://drive.google.com/file/d/1wEchFcOOTuehwoS7fLqtGW5HFvEKG_-v/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26180 [article]

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