Microstructural evolution of PP/EPDM/organoclay nanocomposites in a twin screw extruder / R. Khosrokhavar in INTERNATIONAL POLYMER PROCESSING, Vol. XXVI, N° 2 (05/2011)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVI, N° 2 (05/2011) . - p. 212-218 Titre : Microstructural evolution of PP/EPDM/organoclay nanocomposites in a twin screw extruder Type de document : texte imprimé Auteurs : R. Khosrokhavar, Auteur ; Ghasem Naderi, Auteur ; G. R. Bakhshandeh, Auteur ; M. H. R. Ghoreishy, Auteur Année de publication : 2011 Article en page(s) : p. 212-218 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Argile Cloisite Diffractométrie de rayons X Ethylène-propylène-diène monomère Extrudeuse bi-vis Matériaux hybrides Microscopie électronique en transmission Polypropylène Rhéologie Index. décimale : 668.9 Polymères Résumé : The offline Microstructure of nanocomposites based on Poly-Propylene (PP), Ethylene-Propylene Diene Monomer (EPDM) and Cloisite 15A along the twin screw extruder barrel was investigated by X-Ray diffraction, Transmission Electron Microscopy (TEM) and rheological measurements. To assess the effect of screw zones, the microstructural development of nanocomposites along the screw was investigated. Accordingly, dead-stop experiment samples were taken at four different positions of the extruder after abruptly stopping the machine and opening the barrel. Effect of clay loading on the evolution of morphology in the extruder was studied. X-Ray diffraction results showed that at lower clay contents (up to~ 7 wt.%), the intercalation process is independent of screw geometry and accomplishes as soon as the matrix is melted; and on the other hand, excessive melt mixing of the samples containing higher clay loadings (10 wt.%) might lead to the collapse of silicate layers and consequently poor degrees of intercalation/exfoliation. Results were confirmed by TEM micrographs and also XRD patterns of the nanocomposites sensitively detecting the microstructural changes of the samples. DOI : 10.3139/217.2445 En ligne : https://drive.google.com/file/d/1hk4uZSKHI-M41ZOWEmk16v1JCxi6lpmR/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11525 [article]

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Microstructure and mechanical properties of nanocomposite based on polypropylene/ethylene propylene diene monomer/graphene / M. Haghnegahdar in INTERNATIONAL POLYMER PROCESSING, Vol. XXXII, N° 1 (03/2017)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXII, N° 1 (03/2017) . - p. 72-83 Titre : Microstructure and mechanical properties of nanocomposite based on polypropylene/ethylene propylene diene monomer/graphene Type de document : texte imprimé Auteurs : M. Haghnegahdar, Auteur ; Ghasem Naderi, Auteur ; M. H. R. Ghoreishy, Auteur Année de publication : 2017 Article en page(s) : p. 72-83 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alliages polymères Analyse thermomécanique dynamique Charges (matériaux) Composites -- Propriétés mécaniques Composites -- Propriétés thermiques Diffractométrie de rayons X Ethylène-propylène-diène monomère Microscopie électronique en transmission Morphologie (matériaux) Nanoparticules Oxyde de graphène Polypropylène Rhéologie Structure cristalline (solide) Transition vitreuse Index. décimale : 668.4 Plastiques, vinyles Résumé : Polypropylene (PP)/ethylene propylene diene monomer (EPDM)/ graphene nanosheets (GNs) were compounded by a two-step melt mixing process via an internal mixer (brabender plasticorder). The effect of GNs, graphene oxide (GOSs) and graphene oxide functionalized with PP chains (PP-g-GOSs) on various blend properties were investigated. Wide X-ray diffraction (WAXD) patterns and transmission electron microscopy (TEM) images of the prepared nanocomposites revealed that the nanofillers were mostly dispersed into the PP phase and the dispersion state of GNs was improved with functionalization of graphene. SEM photomicrographs indicated that rubber droplets were distributed in the PP phase and a reduction of the dispersed EPDM droplet size was observed most likely due to increase in the viscosity of the PP-phase during melt mixing. The effects of nanofillers on thermal, mechanical and rheological properties were reported, and the obtained results were discussed in terms of morphology, state of dispersion and distribution of the nanofillers within the PP matrix. As for the mechanical properties, an improvement of 56% in tensile modulus and 48% in tensile strength, while 72% reduction in elongation at break was observed. The DMTA results revealed that the nanocomposites based on PP-g-GOSs had lower damping behavior and the intensity of the loss factor decreased by increasing the GNs content. These results indicate the presence of a strong interfacial interaction between the nanoplatelets and the polymer matrix. Note de contenu : - EXPERIMENTAL : Materials - preparation of PP-g-GOSs - Preparation of PP/EPDM Nanocomposites - Characterization - RESULTS AND DISCUSSION : Characterization of modified graphene - Torque and mixing time - crystal structure of PP/EPDM Nanocomposites - Morphological studies - Glass transition temperature - Mechanical properties - Crystallization behavior - Rheological properties DOI : 10.3139/217.3286 En ligne : https://drive.google.com/file/d/1BJ0GwQ8KudrLgXBEYFuDq_e6H0FKgXJM/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28003 [article]

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Modeling the flow in the metering zone of single screw extruders using a helical geometry model / M. H. R. Ghoreishy in INTERNATIONAL POLYMER PROCESSING, Vol. XIX, N° 2 (06/2004)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XIX, N° 2 (06/2004) . - p. 95-100 Titre : Modeling the flow in the metering zone of single screw extruders using a helical geometry model Type de document : texte imprimé Auteurs : M. H. R. Ghoreishy, Auteur ; M. Razavi Nouri, Auteur Année de publication : 2004 Article en page(s) : p. 95-100 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : This research work is devoted to the development of a finite element model for the simulation of the flow of polymer melts through the metering zone of single screw extruders. The sets of the governing equations (flow and energy) were solved using the continuous penalty scheme and a streamline upwinding Petrov-Galerkin method, respectively. The non-Newtonian rheological behavior of the fluid was also taken into account by the use of the power-law model. The novelty of this work is the application of this model on the flow of a polypropylene melt through the helical geometry of a single screw extruder. To validate this model, the results of the computer simulations were compared with experimentally measured mass flow rate and also results from a previous model, which was based on the simulation of the flow in a flat flow domain. Comparisons showed that not only there are very good agreements between the model predictions and actual data but also inclusion of the curvature of the screw flights has an important influence on the accuracy of the results. DOI : 10.3139/217.1820 En ligne : https://drive.google.com/file/d/1XKclRYQOoWkozzd03eAicRCMDWfjb5UK/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3276 [article]

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Numerical analysis of rubber moulding using finite element modelling / N. S. Hanspal in INTERNATIONAL POLYMER PROCESSING, Vol. XX, N° 3 (09/2005)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XX, N° 3 (09/2005) . - p. 238-244 Titre : Numerical analysis of rubber moulding using finite element modelling Type de document : texte imprimé Auteurs : N. S. Hanspal, Auteur ; M. H. R. Ghoreishy, Auteur ; V. Nassehi, Auteur Année de publication : 2005 Article en page(s) : p. 238-244 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Finite element technique is used to model the free surface flow regime representing injection mould filling of elastomeric material such as rubber compounds. The most distinct feature of the constitutive behaviour of elastomers, is the influence of material elasticity on the elongation and shear deformation suffered by the fluid during flow. In the present study this feature has been tackled through the use of Criminale-Erickson-Fibley (CEF) model. A scheme based on the Volume of Fluid technique is developed for free surface tracking. The results represented in this paper have also been compared against the Phan-Thien/Tanner model and are shown to be in closer agreement with the theoretical expectations than those obtained by the P-T/T equation. The results prove the applicability of the developed model to industrially relevant situations. DOI : 10.3139/217.1881 En ligne : https://drive.google.com/file/d/1slZ4WIU-0SeBdMBit9WB2X-orOrD4Oyk/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3059 [article]

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