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INTERNATIONAL POLYMER PROCESSING / Polymer Processing Society . Vol. XXVII, N° 3Mention de date : 07/2012Paru le : 07/07/2012 |
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Ajouter le résultat dans votre panierRheo-chemistry in reactive processing of polyolefin / W. Yu in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 3 (07/2012)
[article]
Titre : Rheo-chemistry in reactive processing of polyolefin Type de document : texte imprimé Auteurs : W. Yu, Auteur ; J. Liu, Auteur ; C. Zhou, Auteur Année de publication : 2012 Article en page(s) : p. 286-298 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Elastomères
Polyéthylène
PolyoléfinesUne polyoléfine, parfois appelée polyalcène, désigne un polymère aliphatique saturé, synthétique, issu de la polymérisation d'une oléfine (aussi appelée un alcène) telle l'éthylène et ses dérivés.
La formule générale est -(CH2-CRR')n-, où R et R' peuvent être l'atome d'hydrogène (H) ou les radicaux alkyle apolaires CH3, CH2-CH3, CH2-CH(CH3)2. Il existe aussi des mousses isolantes souples faites à partir de polyoléfine (pour l'isolation thermique de tuyaux plastiques par exemple).
PRESENTATION : Les polyoléfines forment la plus importante famille de matières plastiques, avec quatre représentants (PP, HDPE, LDPE, LLDPE) parmi les plastiques de grande consommation. La consommation mondiale de ces quatre polymères est évaluée à plus de 60 millions de tonnes en 20001.
Seul un petit nombre de polyoléfines a atteint le niveau industriel :
les polyoléfines thermoplastiques semi-cristallines : polyéthylène (PE), polypropylène (PP), polyméthylpentène (PMP), polybutène-1 (PB-1) ;
les polyoléfines élastomères : polyisobutylène (PIB), éthylène-propylène (EPR ou EPM) et éthylène-propylène-diène monomère (EPDM).
PROPRIETES : En raison de leur nature paraffinique, les polyoléfines sont hydrophobes et possèdent en général une grande inertie chimique (aux solvants, acides, bases, etc.). Ces matériaux ont donc une qualité alimentaire. Le collage est très difficile (la surface est particulièrement inerte, des traitements de surface spéciaux sont nécessaires).
Cependant, ils sont sensibles à l'action des UV, et résistent très peu à l'inflammation car leur indice limite d'oxygène est faible (exemple : ILO ~ 17 pour le polyéthylène).
Leur densité est très faible [0,83 (cas du PMP) < d < 0,95] : ils flottent dans l'eau.
Ils sont opaques, sauf le PMP (transparent).
Polypropylène
Réaction de couplage
Réactions chimiques
Réticulation (polymérisation)
Rhéologie
Scission (chimie)Index. décimale : 668.9 Polymères Résumé : A brief review of reactive processing of polyolefins, which are the most widely used polymers today, is given in this paper from the role of flow field in processing and the characterization of the modified chain topologies. The materials are mainly focused on polyethylene (PE), polypropylene (PP) and polyolefin elastomer (POE) here. Aspects of reactions, coupling/crosslinking and scission are discussed both in terms of the mechanism and kinetics under different flow conditions. Note de contenu : - Flow effect on the reaction mechanism
- Kinetics of free radical reactionsDOI : 10.3139/217.2431 En ligne : https://drive.google.com/file/d/1AGGJs-A59C0ZhF5-E7ogTMVwpVu8f8wE/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15574
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Code-barres Cote Support Localisation Section Disponibilité 13995 - Périodique Bibliothèque principale Documentaires Disponible Visualization analysis of a multilayer foam development process in microcellular injection molding / T. Yamada in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 3 (07/2012)
[article]
Titre : Visualization analysis of a multilayer foam development process in microcellular injection molding Type de document : texte imprimé Auteurs : T. Yamada, Auteur ; Y. Murata, Auteur ; H. Yokoi, Auteur Année de publication : 2012 Article en page(s) : p. 299-309 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Construction sandwich
Matières plastiques -- Moulage par injection microcellulaire
Mousses plastiques
Polystyrène
Revêtements multicouchesIndex. décimale : 668.4 Plastiques, vinyles Résumé : In this study, cross-sectional analyses were performed on microcellular injection-molded high-impact polystyrene products. The results confirm that the following five types of layers were formed: Skin layers I (the silver streak layer) and II (a nonfoamed layer), Core layers I (cell diameter, d > 150 µm), II (d < 50 µm), and III (d > 100 µm). As the maximum in-mold pressure (Pmax) was increased from 5 to 30 MPa, the thickness of Skin layer II remained nearly constant. However, the foam types in the core layers changed from I and II to II and III or III only, resulting in an increase in cell diameter and a decrease in cell density. The process of cellular structure formation was observed using a glass-inserted mold, which revealed that this process consists of a flow (with a burst of cells at the melt front and the subsequent flow of the melt containing the cells), an end of the filling (involving elastic compression or the dissolution and disappearance of cells formed in the flow stage), and a cooling (new cell generation and growth and cooling solidification). Based on these cross-sectional observations, in concert with meltpressure measurements and visualizations, we developed a model describing the formation process of Skin layer II and the core layers including a new concept that considers the melt pressure inside the cavity. The following layers are incorporated into the model: Skin layer II: A nonfoamed layer is formed in the area of the melt front where gases diffuse out from within the melt during the filling stage, and this nonfoamed layer moves to from melt front to the surface of the product due to fountain flow. Core layers I and II: A multilayer is formed containing a distribution of cells preserved from the flow stage due to the low compression forces, Core layer III: cells are dissolved in the melt due to strong compression forces at the end of the filling stage and then reform and grow in the cooling stage. DOI : 10.3139/217.2443 En ligne : https://drive.google.com/file/d/1dVnoo3jHmY1a6xZXcNmshaz-sdzkH-C-/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15575
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Code-barres Cote Support Localisation Section Disponibilité 13995 - Périodique Bibliothèque principale Documentaires Disponible Visualization analysis of resin flow behavior around a flow front using a rotary runner exchange system / Y. Kanetoh in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 3 (07/2012)
[article]
Titre : Visualization analysis of resin flow behavior around a flow front using a rotary runner exchange system Type de document : texte imprimé Auteurs : Y. Kanetoh, Auteur ; H. Yokoi, Auteur Année de publication : 2012 Article en page(s) : p. 310-317 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Ecoulement visqueux
Fluides, Mécanique des
Matières plastiques -- Moulage par injection -- Appareils et matériel
Moulage par injection -- Défauts
Moules d'injection
PolystyrèneIndex. décimale : 668.4 Plastiques, vinyles Résumé : In plastic injection molding, external defects such as flow marks are serious problems. These external defects are known to occur during cavity filling processes inside the mold, and are closely related to resin flow behavior in the flow front area. In this study, the authors propose a new method for visualizing in-mold resin flow behavior using a glass-inserted mold and rotary runner exchange system capable of instantaneously switching two types of melt at the runner just before the gate. This method is capable not only of dynamic visualization, but also static visualization by the observation of cross-sections of a sample, because colored resins switched multiple times at the gate spread in layers inside the sample and freeze. Using this method and general purpose polystyrene, visualization analysis of the flow behavior of inner layer resins near the flow front in simple rectangular cavities was carried out. As a result, it was found that resins reaching the flow front are not exposed at the molded product surface immediately after the fountain-flow process, but remain along the circumference of the flow front for a long period of time, and then stretch out into a thin filmlike shape to form the surface of the molded product. In addition, the inner layer resins near the flow front form a converging flow just before reaching the flow front and then form a fountain flow. It was also confirmed that this is a general phenomenon in the fountain-flow process during injection molding regardless of whether the resin is crystalline or noncrystalline. Based on these results, we built a model on the flow of inner layer resins near the flow front of general resins. DOI : 10.3139/217.2457 En ligne : https://drive.google.com/file/d/12C-9v6b6ma__sKVLqopueoqxp7OW7vvm/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15576
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Code-barres Cote Support Localisation Section Disponibilité 13995 - Périodique Bibliothèque principale Documentaires Disponible Influence of the calendering step on the adhesion properties of coextruded structures / M. C. Serrat in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 3 (07/2012)
[article]
Titre : Influence of the calendering step on the adhesion properties of coextruded structures Type de document : texte imprimé Auteurs : M. C. Serrat, Auteur ; Jean-François Agassant, Auteur ; J. Bikard, Auteur ; S. Devisme, Auteur Année de publication : 2012 Article en page(s) : p. 318-327 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adhésion
CalandrageLe calandrage est une opération qui consiste à faire passer un matériau entre deux cylindres pour le lisser ou le lustrer, ou pour produire un film ou une feuille. Des matériaux de plus faible épaisseur (produits semi-finis, feuilles, plaques, films, crêpes) peuvent être obtenus par calandrage d'un système thermoplastique ou élastomère entre des cylindres éventuellement chauffants.
Une calandreuse comporte au moins deux rouleaux contrarotatifs, dont l'écartement est ajustable. Plusieurs passages entre les cylindres peuvent être réalisés.
Cette opération est par exemple utilisée pour fabriquer des revêtements de sols et de murs, des nappes, de l'ameublement, de la maroquinerie et des articles gonflables.
Pour les pâtes de faible viscosité, une calandreuse peut servir de mélangeur en formulation.
En papeterie, l'opération de calandrage permet d'obtenir différents états de surface de la feuille de papier, notamment pour les papiers couchés. Selon le degré de calandrage (pression, température de chauffe), le papier sera plus ou moins lissé et brillant.
Matières plastiques -- Extrusion
Revêtements multicouches
ThermoplastiquesUne 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.Index. décimale : 668.4 Plastiques, vinyles Résumé : The coupled coextrusion calendering process of multilayer thermoplastic sheets has been studied. The structure of the film has been observed, the density of chemical links at the interface and the adhesion between the coextruded layers have been measured. There are some controversial features about the influence of calendering parameters. Several models of increasing complexity are proposed to master the process and its influence on adhesion. A multilayer thermal model accounting for the crystallization kinetics of both polymers allows defining qualitatively the temperature field especially at the interface between the two layers. A multilayer thermo- mechanical model provides quantitative figures on the stress, shear, elongation and temperature fields in the coextruded film and especially at the interface. Relationships between these parameters, density of chemical links at the interface, crystalline structure of the sample and peeling forces are discussed. DOI : 10.3139/217.2516 En ligne : https://drive.google.com/file/d/1tksjugJhmQhUzMw6kRFlnKX79tQ4S2tD/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15577
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Code-barres Cote Support Localisation Section Disponibilité 13995 - Périodique Bibliothèque principale Documentaires Disponible The effect of silane treated hybrid filler on the mechanical and thermal performance of carboxylated nitrile butadiene rubber (XNBR) composites / A. Mousa in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 3 (07/2012)
[article]
Titre : The effect of silane treated hybrid filler on the mechanical and thermal performance of carboxylated nitrile butadiene rubber (XNBR) composites Type de document : texte imprimé Auteurs : A. Mousa, Auteur ; G. Heinrich, Auteur ; U. Wagenknecht, Auteur Année de publication : 2012 Article en page(s) : p. 328-333 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Charges (matériaux)
Copolymère carboxylique de butadiène et de nitrile acrylique
Copolymères -- Propriétés mécaniques
Copolymères -- Propriétés thermiques
SilanesIndex. décimale : 668.9 Polymères Résumé : Carboxylated Nitrile Butadiene Rubber (XNBR) was reinforced with untreated and silane treated hybrid filler. The hybrid filler was composed of organic layered nanosilicates (NLS) and agro polymer based olive husk powder (OHP). The fabricated composites were inspected with regard to their mechanical and thermal properties. It was found that the silane treated hybrid filler was able to improve the tensile strength at break and the tensile modulus as compared to the control. The overall degree of interaction between the matrix and both the untreated and treated hybrid filler was improved. This was evidenced by the increased degree of curing which is the torque difference (Ï„max– Ï„min) derived from the moving die rheometer (MDR) and the decreased swelling index data. Dynamic mechanical analysis (DMA) revealed that the apparent was the highest in case of the silane treated hybrid filler. The thermogravimetric analysis (TGA) revealed that the thermal stability of the composites improved with the incorporation of the hybrid filler. The attenuated total reflectance (ATR-IR) revealed that dipole-dipole interactions between the various reactive functional groups namely the carboxylic of the XNBR, the hydroxyl group of the agro-polymer and the silanol of the silane agent occurred during the fabrication stage of the composites. Scanning electron microscopy (SEM) showed that the fracture surface of the samples differ after the incorporation of the treated hybrid filler. DOI : 10.3139/217.2522 En ligne : https://drive.google.com/file/d/18VQta1c7xNQqn_KMZSGQf7M37ZkENfgg/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15578
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Code-barres Cote Support Localisation Section Disponibilité 13995 - Périodique Bibliothèque principale Documentaires Disponible Bioplastics from blends of Cassava and rice flours : the effect of blend composition / Natinee Lopattananon in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 3 (07/2012)
[article]
Titre : Bioplastics from blends of Cassava and rice flours : the effect of blend composition Type de document : texte imprimé Auteurs : Natinee Lopattananon, Auteur ; C. Thongpin, Auteur ; N. Sombatsompop, Auteur Année de publication : 2012 Article en page(s) : p. 334-340 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bioplastiques -- Propriétés mécaniques
Farines végétales
Manioc
Mélange
Riz et constituantsIndex. décimale : 668.4 Plastiques, vinyles Résumé : Bioplastics from melt-mixing of cassava flour, rice flour and their blends with compositions of between 0/100 and 100/0 %wt were successfully obtained using twin-screw extrusion and compression molding processes. The influence of blend composition on the bioplastic’s properties was studied. It was found that the flour blends were uniformly mixed. The tensile properties and dynamic properties of the flour bioplastics were examined. The tensile strength and storage modulus of compression molded bioplastics based on rice flour was greater than those of the cassava flour, but their flexibility was lower. The tensile strength and storage modulus of the flour blend bioplastics increased with increasing rice flour content. The flour bioplastics showed two glass transitions, one corresponding to glycerol rich phase and the other corresponding to plasticized starch. For plasticized flour blends, the glass transitions were not affected by the blend composition. The improvement in the mechanical properties of the bioplastics produced from the cassava/rice flour blend could be explained by an increase in the crystallinity level resulting from the higher concentration of rice flour. Using flour blends derived from cassava and rice flours, the bioplastics developed in this study offer a greater performance while maintaining environmental compatibility and sustainability, which allows for a substitution of tradition bioplastics from cassava starch. DOI : 10.3139/217.2532 En ligne : https://drive.google.com/file/d/1Eu4a8Dszy4i7eRR0zBZXuL--T6o9rF44/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15579
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Code-barres Cote Support Localisation Section Disponibilité 13995 - Périodique Bibliothèque principale Documentaires Disponible A warpage optimization method for injection molding using artificial neural network combined weighted expected improvement / H. Shi in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 3 (07/2012)
[article]
Titre : A warpage optimization method for injection molding using artificial neural network combined weighted expected improvement Type de document : texte imprimé Auteurs : H. Shi, Auteur ; X. Wang, Auteur ; S. Xie, Auteur Année de publication : 2012 Article en page(s) : p. 341-347 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Gauchissement (matériaux)
Matières plastiques -- Moulage par injection
Polyéthylène basse densité
Polyéthylène basse densité linéaire
Réseaux neuronaux (informatique)Index. décimale : 668.4 Plastiques, vinyles Résumé : A surrogate-based warpage optimization for injection molding is proposed in this study. The optimization process aims at minimizing the warpage of the injection molding parts in which process parameters, i. e., the mold temperature, melt temperature, injection time, packing time, packing pressure, and cooling time are the design variables. The warpage values are reduced by optimizing the process parameters. A new optimization iteration scheme based on artificial neural network (ANN) combined weighted expected improvement (WEI) is employed to speed up the optimization process and to ensure very rapid and steady convergence. The ANN is used to build an surrogate warpage function for the process parameters, replacing the expensive simulation analysis in the optimization iterations. The adaptive process is executed by the WEI function, which is an infilling sampling criterion. Although the design of experiment (DOE) size is small, this criterion can precisely balance the local and global search and tend to find the global optimal design. As examples, a TV cover and a scanner are investigated. The results show that the proposed approach can effectively reduce the warpage of the injection molding parts. DOI : 10.3139/217.2542 En ligne : https://drive.google.com/file/d/1dI2t1FKionveyHM1TOoSX9Te6nERU0pk/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15580
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Code-barres Cote Support Localisation Section Disponibilité 13995 - Périodique Bibliothèque principale Documentaires Disponible Bi-axially oriented blown film technology / Olga. S. Carneiro in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 3 (07/2012)
[article]
Titre : Bi-axially oriented blown film technology : searching for suitable polymers and processing conditions Type de document : texte imprimé Auteurs : Olga. S. Carneiro, Auteur ; Jose A. Covas, Auteur ; C. Domingues, Auteur Année de publication : 2012 Article en page(s) : p. 348-357 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Films plastiques
Matières plastiques -- Extrusion
Matières plastiques -- Moulage par soufflage
Polyéthylène basse densité
Polyéthylène basse densité linéaire
RhéologieIndex. décimale : 668.4 Plastiques, vinyles Résumé : A set of commercial polyethylenes (three LDPE and three LLDPE) was rheological characterized and processed in a laboratory double bubble extrusion line with the purpose of investigating: i) whether their relative processability could be predicted in the laboratory and ii) the effect of operating and machine variables on processability. Oscillatory shear and extensional measurements were able to differentiate the various materials, who also behaved quite differently upon processing. Those with a stronger shear thinning behaviour, higher elasticity and higher melt strength were the most suited to the process. Bubble stability and thickness uniformity were assumed as the main requirements for processability. The former was estimated by monitoring the time required to stabilize the bubble and examining any variation/oscillation in size/shape. Bubble stability depends on the interaction between various parameters, the most relevant being those related with the film cooling stage, namely the axial position of the air rings, the air flow rate and air velocity. The study was preceded by an assessment of the performance of the re-heating oven and die/calibration/centring, as these parameters could also narrow the practical operating window. DOI : 10.3139/217.2538 En ligne : https://drive.google.com/file/d/1vmDHZ82pkVX1zGGfuPziStB4r2smFuX0/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15581
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Code-barres Cote Support Localisation Section Disponibilité 13995 - Périodique Bibliothèque principale Documentaires Disponible Stretch-blow molding of PET copolymers - influence of molecular architecture / E. Déloye in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 3 (07/2012)
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Titre : Stretch-blow molding of PET copolymers - influence of molecular architecture Type de document : texte imprimé Auteurs : E. Déloye, Auteur ; Jean-Marc Haudin, Auteur ; N. Billon, Auteur Année de publication : 2012 Article en page(s) : p. 358-369 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acide isophthalique 'acide isophtalique ou l'acide benzène-1,3-dicarboxylique, est un acide dicarboxylique aromatique de formule C6H4(COOH)2.
C’est un isomère de l’acide téréphtalique et de l’acide phtalique.
Masse moléculaire : 166,1 g/mol.
Diéthylène glycol
Matières plastiques -- Moulage par soufflage
Polyéthylène téréphtalate
Structure moléculaire
TriméthylolpropaneIndex. décimale : 668.4 Plastiques, vinyles Résumé : The purpose of the paper is to study the influence of molecular architecture of poly(ethylene terephthalate) (PET) on its ability to be processed by stretch-blow molding, which is not well documented in the literature. To evaluate this process ability, it proposes an original strategy combining laboratory analyses and experiments on a prototype machine. PET copolymers were prepared from three types of comonomers: diethylene glycol (DEG), isophthalic acid (IPA) and trimethylolpropane (TMP). It is first shown, through laboratory experiments, that the nature of the polymer in terms of chain constitution (copolymerization), chain length (intrinsic viscosity) and purity (catalytic residues) greatly affects many properties: melt crystallization, thermal properties, polymer rigidity and drawability. These different properties obviously induce very different behaviours at the different steps of the stretch-blow molding process: injection-molding of the preform (quenchability), heating (IR absorption), stretch-blow (rigidity and drawability). The stretch-blow step has been simulated on a prototype apparatus designed in our laboratory. It has been shown that free blowing can be used to characterize the process ability of the polymer. A statistical analysis has confirmed the great differences between the materials investigated and pointed out the complexity of the material response during blowing. DOI : 10.3139/217.2549 En ligne : https://drive.google.com/file/d/1Wnc9qot-nbTluYL9Wg2gFqk4-U1WD1FG/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15582
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Code-barres Cote Support Localisation Section Disponibilité 13995 - Périodique Bibliothèque principale Documentaires Disponible Rotational molding of polyamide-6 nanocomposites with improved flame retardancy / E. Calò in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 3 (07/2012)
[article]
Titre : Rotational molding of polyamide-6 nanocomposites with improved flame retardancy Type de document : texte imprimé Auteurs : E. Calò, Auteur ; C. Massaro, Auteur ; R. Terzi, Auteur ; A. Cancellara, Auteur ; E. Pesce, Auteur ; M. Re, Auteur ; A. Greco, Auteur ; A. Maffezzoli, Auteur ; P. I. Gonzalez, Auteur ; A. Salomi, Auteur Année de publication : 2012 Article en page(s) : p. 370-377 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse thermomécanique
IgnifugeantsComposé chimique utilisé pour réduire l'inflammabilité. Il peut être incorporé au produit durant sa fabrication ou appliqué ultérieurement à sa surface.
Matières plastiques -- Rotomoulage
Montmorillonite
Polyamide 6
RhéologieIndex. décimale : 668.4 Plastiques, vinyles Résumé : The aim of this work was to develop polyamide-6/ organic modified montmorillonite (omMMT) nanocomposites for the production of hollow parts by rotational molding. Particular emphasis was placed on the mechanical and flame retardancy properties needed for the fabrication of vessels for flammable liquids. The morphology of the melt compounded nanocomposites, produced by melt compounding, was investigated by Xray diffraction measurements (WAXD), and Transmission Electron Microscopy (TEM) showed an exfoliated structure. Rheological measurements were used in order to verify whether the viscosity of materials was adequate for rotational molding. While thermomechanical analysis has revealed that neat PA6 and its nanocomposites were not suitable for rotational molding, due to the very low thermal stability of the polymer, the addition of a thermal stabilizer, shifted the onset of degradation to higher temperatures, thus widening the processing window of both PA6 and PA6 nanocomposites. Largescale vessel prototypes were obtained by rotational molding of thermo-stabilized PA6 and its nanocomposites, and samples extracted from the rotomolded parts were characterized with respect to physical and mechanical properties. It was found that the PA6 nanocomposites exhibited significant improvements at cone calorimeter tests in comparison with neat PA6. DOI : 10.3139/217.2552 En ligne : https://drive.google.com/file/d/1FTUKzbnIG5oK6lzcCucRm0UPr0OtatOk/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15583
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Code-barres Cote Support Localisation Section Disponibilité 13995 - Périodique Bibliothèque principale Documentaires Disponible Effect of blending protocol on the rheological properties and morphology of HDPE and LLDPE blend-based nanocomposites / Fabio R. Passador in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 3 (07/2012)
[article]
Titre : Effect of blending protocol on the rheological properties and morphology of HDPE and LLDPE blend-based nanocomposites Type de document : texte imprimé Auteurs : Fabio R. Passador, Auteur ; Adhemar C. Ruvolo-Filho, Auteur ; L. A. Pessan, Auteur Année de publication : 2012 Article en page(s) : p. 378-385 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alliages polymères
Anhydride maléique
Matériaux hybrides
Montmorillonite
Polyéthylène basse densité linéaire
Polyéthylène haute densité
Rhéologie
Structure cristalline (solide)Index. décimale : 668.4 Plastiques, vinyles Résumé : Nanocomposites based on high density polyethylene (HDPE)/linear low density polyethylene (LLDPE) blend were prepared by melt compounding in a torque rheometer using an organoclay (montmorillonite) as nano-filler and maleic anhydridegrafted linear low density polyethylene (LLDPE-g-MA) as compatibilizer. The effects of five blending protocols on microstructure, crystallinity and rheological properties of the prepared samples were examined. The steady state rheological properties showed that the addition of nanoclay to the HDPE/LLDPE blend increased its shear viscosity at low shear rates changing the behavior of the HDPE/LLDPE matrix to a more pronounced shear thinning behavior. The blending sequence (LLDPE/LLDPE-g-MA/20A)/HDPE (where LLDPE and LLDPE-g-MA were first mixed with organoclay and then this system was later blended with HDPE) showed a lower slope of the log g versus log γ curve and these results can be an indicative that the interactions between the matrix and the organoclay are stronger. The organoclay interlayer spacing and the crystallinity of the polymer domains were also influenced by the blending sequence. The crystallinity was calculated through the mathematical deconvolution of the peaks observed in the WAXD profiles. Overall, the crystallization of HDPE in the blends was hardly influenced by the presence of LLDPE. The blending sequence (LLDPE/LLDPE-g-MA/20A)/HDPE showed lower cristallinity when compared to others blending sequences. On the other hand, it was observed an increase in the organoclay interlayer spacing of this nanocomposite because the intercalation and/or exfoliation process occurs preferentially in the amorphous phase. DOI : 10.3139/217.2567 En ligne : https://drive.google.com/file/d/1lIQb9pM2Akh7QBUAGlF6qeWHZhiQIMFK/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15584
in INTERNATIONAL POLYMER PROCESSING > Vol. XXVII, N° 3 (07/2012) . - p. 378-385[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 13995 - Périodique Bibliothèque principale Documentaires Disponible High-strength PET fibers produced by conjugated melt spinning and laser drawing / K. Nakata in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 3 (07/2012)
[article]
Titre : High-strength PET fibers produced by conjugated melt spinning and laser drawing Type de document : texte imprimé Auteurs : K. Nakata, Auteur ; F. Nakamura, Auteur ; Y. Ohkoshi, Auteur ; Y. Gotoh, Auteur ; M. Nagura, Auteur ; A. Hamano, Auteur ; S. Takada, Auteur ; Takeshi Kikutani, Auteur Année de publication : 2012 Article en page(s) : p. 386-391 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Fibres textiles -- Propriétés mécaniques
Fibres textiles synthétiques
Filature
Frittage laser
Polyéthylène téréphtalateIndex. décimale : 668.9 Polymères Résumé : The mechanical properties of conjugated-spun and laser drawn poly(ethylene terephthalate) (PET) fibers were investigated. The as-spun fibers used for the laser drawing were made by conjugated melt spinning with the copolymer of p-hydroxybenzoicacid and 2-hydroxy-6-naphthoicacid or polystyrene. The PET fibers prepared by conjugated spinning could be laser drawn to higher draw ratios under lower drawing stresses. The drawn fiber could be re-drawn up to a higher total draw ratio. Thus, a PET fiber having a tensile strength of 1.14 N/tex could be produced. DOI : 10.3139/217.2573 En ligne : https://drive.google.com/file/d/1KbHVwS8W9OJD0i0OtOzSsXpSiu88jshm/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15585
in INTERNATIONAL POLYMER PROCESSING > Vol. XXVII, N° 3 (07/2012) . - p. 386-391[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 13995 - Périodique Bibliothèque principale Documentaires Disponible Effect of blend ratio of h-LLDPE and LDPE on tear properties of blown films / K. Mezghani in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 3 (07/2012)
[article]
Titre : Effect of blend ratio of h-LLDPE and LDPE on tear properties of blown films Type de document : texte imprimé Auteurs : K. Mezghani, Auteur ; S. Furquan, Auteur ; S. H. Tabatabaei, Auteur ; Abdellah Ajji, Auteur Année de publication : 2012 Article en page(s) : p. 392-398 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alliages polymères
Déchirure (mécanique)
Films plastiques
Matières plastiques -- Moulage par soufflage
Polyéthylène basse densité
Polyéthylène basse densité linéaireIndex. décimale : 668.4 Plastiques, vinyles Résumé : In the present study, blown films of h-LLDPE, LDPE, and their blends were produced using a twin screw extruder. The tear properties of all films were determined in the machine direction (MD) and the transverse direction (TD). On one hand, similar values of the MD tear-resistance for the two virgin polymers, h-LLDPE and LDPE, were measured to be 100 and 120 kN/m, respectively. On the other hand, the TD tear-resistance value of h-LLDPE was 180 kN/m, four times higher than that of LDPE, 45 kN/m. It was observed that small additions of LDPE (5 to 20 wt.%) to h-LLDPE produced blends with better TD tear-resistance films, 400 kN/m. The main reason for this large increase in tear-resistance was attributed to the morphological changes induced by the addition of the LDPE polymer, as shown by SEM, FTIR, and birefringence techniques. DOI : 10.3139/217.2575 En ligne : https://drive.google.com/file/d/1km2DyzdXrFH3k6gKeOEgrvsq7BwUy_AH/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15586
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Code-barres Cote Support Localisation Section Disponibilité 13995 - Périodique Bibliothèque principale Documentaires Disponible
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Code-barres | Cote | Support | Localisation | Section | Disponibilité |
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13995 | - | Périodique | Bibliothèque principale | Documentaires | Disponible |