Characterization of thermoplastic laser-welded joints / M. H. Al-Wohoush in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 5 (11/2012)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVII, N° 5 (11/2012) . - p. 574-583 Titre : Characterization of thermoplastic laser-welded joints Type de document : texte imprimé Auteurs : M. H. Al-Wohoush, Auteur ; Musa R. Kamal, Auteur Année de publication : 2012 Article en page(s) : p. 574-583 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Composites à fibres de verre Composites à fibres de verre -- Propriétés mécaniques Essais dynamiques Polyamide 6 Polycarbonates Soudage laser Thermoplastiques Une matière thermoplastique désigne une matière qui se ramollit (parfois on observe une fusion franche) d'une façon répétée lorsqu'elle est chauffée au-dessus d'une certaine température, mais qui, au-dessous, redevient dure. Une telle matière conservera donc toujours de manière réversible sa thermoplasticité initiale. Cette qualité rend le matériau thermoplastique potentiellement recyclable (après broyage). Cela implique que la matière ramollie ne soit pas thermiquement dégradée et que les contraintes mécaniques de cisaillement introduites par un procédé de mise en forme ne modifient pas la structure moléculaire. Traction (mécanique) Index. décimale : 668.4 Plastiques, vinyles Résumé : Laser-welded joints were prepared using moldings of polycarbonate, polyamide-6, and polyamide-6 reinforced with 30% glass fibers. Preparation of thin polished samples of the joints facilitated examination of the laser-affected zone (LAZ). The samples were examined using optical and polarized light microscopy, as well as scanning electron microscopy. The study evaluated the influence of laser power on the geometry and dimensions of LAZ, in both the absorbent and non-absorbent parts of the joints. The results indicated a correlation between LAZ dimensions and the tensile strength of the laser-welded joints. There is evidence of melt and fiber migration in the LAZ. Note de contenu : - EXPERIMENTAL : Materials - Welding - PLM and SEM test specimens - Image analysis - Tensile strength tests - RESULTS AND DISCUSSION : Joint width - Laser-affected zone - Joint tensile strength - Glass fiber re-orientation DOI : 10.3139/217.2712 En ligne : https://drive.google.com/file/d/1451eu6-dWnVOm7NWPgmJushe9eZ2Rfl4/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16640 [article]

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Effect of processing conditions on properties of PET/clay nanocomposite films / H. Ghasemi in INTERNATIONAL POLYMER PROCESSING, Vol. XXVI, N° 2 (05/2011)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVI, N° 2 (05/2011) . - p. 219-228 Titre : Effect of processing conditions on properties of PET/clay nanocomposite films Type de document : texte imprimé Auteurs : H. Ghasemi, Auteur ; P. J. Carreau, Auteur ; Musa R. Kamal, Auteur ; N. Chapleau, Auteur Année de publication : 2011 Article en page(s) : p. 219-228 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Argile Cloisite Diffraction des rayons X à grand angle Diffractométrie de rayons X Films plastiques -- Propriétés mécaniques Matériaux hybrides Matériaux hybrides -- Propriétés mécaniques Matières plastiques -- Extrusion:Polymères -- Extrusion Microscopie électronique en transmission Polyéthylène téréphtalate Index. décimale : 668.9 Polymères Résumé : Polyethylene terephthalate (PET) nanocomposite films (with 3 wt.% Cloisite 30B) were prepared by cast extrusion followed by uniaxial stretching, using chill rolls. Two screw profiles with different mixing elements under different screw speeds (N) and feeding rates (Q) were used to prepare PET/clay nanocomposite (PCN) films. Transmission electron microscopy (TEM) and wide angle X-ray diffraction (WAXD) showed that the clay layers were aligned in the machine direction (MD). XRD patterns depicted that the interlayer distance of clay platelets in the state of intercalation is somehow independent of the processing conditions, but the macro-scale characterization, including barrier and mechanical properties, showed that the level of clay layer delamination was affected by processing conditions. The results reveal that the applied strain has stronger effect than residence time on the barrier and mechanical properties. At the highest screw speed (N = 250 min–1), 27% reduction in oxygen permeability and 30% improvement in tensile modulus were obtained for the more severe screw profile. DOI : 10.3139/217.2446 En ligne : https://drive.google.com/file/d/1CvQd5mAo3iMwpC48oYrC2pqX7YbvTjes/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11526 [article]

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Electrical, morphological and thermal properties of microinjection molded polypropylene/multi-walled carbon nanotubes nanocomposites / S.-T. Zhou in INTERNATIONAL POLYMER PROCESSING, Vol. XXXIII, N° 4 (08/2018)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXIII, N° 4 (08/2018) . - p. 514-524 Titre : Electrical, morphological and thermal properties of microinjection molded polypropylene/multi-walled carbon nanotubes nanocomposites Type de document : texte imprimé Auteurs : S.-T. Zhou, Auteur ; Andrew N. Hrymak, Auteur ; Musa R. Kamal Année de publication : 2018 Article en page(s) : p. 514-524 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Composites à fibres -- Moulage par micro-injection Composites à fibres de carbone Composites à fibres de carbone -- Propriétés électriques Composites à fibres de carbone -- Propriétés thermiques Mélanges-maîtres (chimie) Nanotubes de carbone à parois multiples Un nanotube de carbone multifeuillet est constitué de plusieurs feuillets de graphènes enroulés les uns autour des autres. Il existe deux modèles pour décrire la structure des nanotubes multifeuillets : - le modèle poupée russe: les plans de graphène sont arrangés en cylindres concentriques ; - le modèle parchemin: un seul feuillet de graphène est enroulé sur lui-même, comme une feuille de papier. Polypropylène Index. décimale : 668.4 Plastiques, vinyles Résumé : A series of polypropylene/multi-walled carbon nanotubes (PP/CNT) nanocomposites were prepared by masterbatch dilution, then followed by microinjection molding under a defined set of processing conditions. A micropart (μ-part) which has a three-step decrease in thickness along the flow direction was fabricated to study the effect of abrupt geometrical changes in mold cavities on the distribution of CNT in PP. To facilitate characterization, the μ-parts were divided into three sections based on thickness. The distribution of CNT within each section of subsequent μ-parts was evaluated by morphological observations and electrical resistivity measurements. In addition, the thermal properties of pure PP and PP/CNT nanocomposites as well as each section of subsequent μ-parts, were assessed by differential scanning calorimetry and thermogravimetric analysis. Note de contenu : - EXPERIMENTAL SECTION : Materials - Preparation of microparts - Characterization - RESULTS AND DISCUSSION : DC electrical resistivity and dielectric measurements - Morphology - Differential scanning calorimetry - Thermogravimetric analysis DOI : 10.3139/217.3541 En ligne : https://drive.google.com/file/d/1D1_reEOphAhQ8gOARPxFYLxIFILFle_z/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30891 [article]

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Flow and thermal history effects on morphology and tensile behavior of poly(oxymethylene) micro injection molded parts / Musa R. Kamal in INTERNATIONAL POLYMER PROCESSING, Vol. XXXII, N° 5 (11/2017)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXII, N° 5 (11/2017) . - p. 590-605 Titre : Flow and thermal history effects on morphology and tensile behavior of poly(oxymethylene) micro injection molded parts Type de document : texte imprimé Auteurs : Musa R. Kamal, Auteur ; R. El Otmani, Auteur ; A. Derdouri, Auteur ; J.-S. Chu, Auteur Année de publication : 2017 Article en page(s) : p. 590-605 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse thermique Calorimétrie Diffraction des rayons X à grand angle Essais dynamiques Fluides, Mécanique des Matières plastiques -- Moulage par micro-injection Microscopie Morphologie (matériaux) Traction (mécanique) Index. décimale : 668.4 Plastiques, vinyles Résumé : The micro injection molding process is a rapidly growing area in plastics processing technology. In this process, the polymer is exposed to both high shear rates and large thermal gradients. In view of the versatility of the process, both commodity and engineering polymers have been used in micro injection molded products. In the present work, poly(oxymethylene) (POM), a partially crystalline engineering polymer, was employed to evaluate the relationships between processing conditions, on one hand, and the morphology and properties of the final part, on the other hand. An unsymmetrical mold cavity to make parts in the form of stepped plaques was used in the study. This resulted in substantial differences in morphology, crystallinity and shrinkage of the zones of different constant thicknesses in the micro parts. Depending on the molding conditions and the location on the micro-part, the microstructure can display up to five crystalline layers. Of particular interest, shish-kebab crystalline structures were observed within the skin of the step with the smallest thickness. Differential scanning calorimetry (DSC) tests are used to distinguish between the melting points of the shish and kebab components of this particular structure. The degree of crystallinity as determined by wide angle X-ray diffraction (WAXD) and shrinkage across the thickness were also found to be highest in the step with the smallest thickness. Note de contenu : - EXPERIMENTAL : Materials and equipments - CHARACTERIZATION METHODS : Polarized light microscopy - Scanning electron microscopy - Mechanical analysis - Differential scanning calorimetry - Shrinkage measurement - Wide angle X-ray diffraction - RESULTS AND DISCUSSION : Morphology along the flow and transverse directions - Differential scanning calorimetry (DSC) - Wide angle X-ray diffraction - Measurement of 3-D shrinkage - Tensile modulus DOI : 10.3139/217.3472 En ligne : https://drive.google.com/file/d/1LbPNfA_cGnBsKJJjhpKJdTCldmb6ca5j/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29426 [article]

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Hydrolytic depolymerization of polyethylene terephthalate by reactive extrusion / T. Yalçinyuva in INTERNATIONAL POLYMER PROCESSING, Vol. XV, N° 2 (06/2000)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XV, N° 2 (06/2000) . - p. 137-146 Titre : Hydrolytic depolymerization of polyethylene terephthalate by reactive extrusion Type de document : texte imprimé Auteurs : T. Yalçinyuva, Auteur ; Musa R. Kamal, Auteur ; R. A. Lai-Fook, Auteur ; S. Özgümüs, Auteur Année de publication : 2000 Article en page(s) : p. 137-146 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Continuous hydrolytic depolymerization of polyethylene terephthalate (PET) resin at high temperature and pressure was carried out in a co-rotating twin screw extruder. In this novel process, hydrolysis is achieved by injection of saturated steam at high pressure. Optimum conditions occur at relatively low screw speeds and water/PET ratios. Hydrolysis extent was measured using carboxyl end group titration, and by determination of molecular weights using NMR and GPC analysis. Low molecular weight products are obtained at low residence times in the extruder, suggesting high depolymerization rates. This is supported by the results of a simple kinetic model. Note de contenu : - HYDROLYSIS MECHANISM AND KINETICS - EXPERIMENTAL WORK : Materials - Extend of hydrolysis and molecular weight - Extrusion and auxiliary equipment - Experimental procedures - RESULTS AND DISCUSSION : Reaction extent - Hydrolysis kinetics - Process characteristics DOI : 10.3139/217.1587 En ligne : https://drive.google.com/file/d/1wkZz83aKyHCR0CiMecJXwXKn6BVkhwes/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16052 [article]

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Measurement and prediction of temperature distribution in an injection molding cavity / F. Manero in INTERNATIONAL POLYMER PROCESSING, Vol. XVIII, N° 2 (06/2003)  

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Melt intercalation in montmorillonite/polystyrene nanocomposites / N. Nassar in INTERNATIONAL POLYMER PROCESSING, Vol. XX, N° 4 (12/2005)  

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Melting temperature characteristics for polyethylenes from crystal size distribution / L. Feng in INTERNATIONAL POLYMER PROCESSING, Vol. XXI, N° 4 (09/2006)  

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Micro replication by injection-compression molding / M. Rohde in INTERNATIONAL POLYMER PROCESSING, Vol. XXIV, N° 3 (07/2009)  

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Morphological characterization of PE blown films by atomic force microscopy / Musa R. Kamal in INTERNATIONAL POLYMER PROCESSING, Vol. XVI, N° 4 (12/2001)  

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Non-linear crystalline spherulitic growth behavior for LLDPE / Musa R. Kamal in INTERNATIONAL POLYMER PROCESSING, Vol. XX, N° 1 (03/2005)  

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Phase separation under shear in liquid crystalline polymer/polycarbonate blends / K.-W. Lee in INTERNATIONAL POLYMER PROCESSING, Vol. XXIV, N° 1 (03/2009)  

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Polystyrene/phosphonium organoclay nanocomposites by melt compounding / J. U. Calderon in INTERNATIONAL POLYMER PROCESSING, Vol. XXIII, N° 1 (03/2008)  

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Processing of polymer nanocomposites / Samuel Kenig / Munchen [Germany] : Hanser (2019)

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Simultaneous biaxial stretching of polypropylene resins of varying tacticity / L. Capt in INTERNATIONAL POLYMER PROCESSING, Vol. XX, N° 4 (12/2005)  

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Simultaneous biaxial stretching of PP resins of varying / L. Capt in INTERNATIONAL POLYMER PROCESSING, Vol. XX, N° 1 (03/2005)  

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The effect of cellulose nanocrystals (CNC) on isothermal crystallization kinetics of LLDPE and HDPE / V. Tan in INTERNATIONAL POLYMER PROCESSING, Vol. XXXIII, N° 3 (07/2018)  

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The effect of molecular parameters on the thermal behavior of recycled and virgin polyamides and their glass fiber composites / A. Mirzadeh in INTERNATIONAL POLYMER PROCESSING, Vol. XXIX, N° 1 (03/2014)  

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The pressure-volume-temperature behavior polyethylene melts / L. Capt in INTERNATIONAL POLYMER PROCESSING, Vol. XV, N° 1 (03/2000)  

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