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Mention de date : 11/2013
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Use of the Taguchi method for optimization of poly (butylene terephthalate) and poly (trimethylene terephthalate) blends through injection molding / M. Zaverl in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 5 (11/2013)
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Titre : Use of the Taguchi method for optimization of poly (butylene terephthalate) and poly (trimethylene terephthalate) blends through injection molding Type de document : texte imprimé Auteurs : M. Zaverl, Auteur ; Manjusri Misra, Auteur ; A. Mohanty, Auteur Année de publication : 2013 Article en page(s) : p. 454-462 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alliages polymères -- propriétés mécaniques
Analyse mécanique dynamique
Calorimétrie
Cristallisation
Microscopie
Polybutylène téréphtalate
Polytriméthylène téréphtalateLe polytéréphtalate de triméthylène ou polytriméthylène téréphtalate abrégé en PTT est un polymère de type polyester synthétisé pour la première fois et breveté en 1941. Similaire au polyéthylène téréphtalate, le PTT est utilisé pour fabriquer des fibres de tapis.
Fabrication : Il est produit par polymérisation par étapes, qui dans ce cas précis est une transestérification. Les deux monomères utilisés pour fabriquer ce polymère sont le propane-1,3-diol et l'acide téréphtalique ou le téréphthalate de diméthyle.
Taguchi, Méthodes de (Contrôle de qualité)Index. décimale : 668.4 Plastiques, vinyles Résumé : A statistical experimental design method known as the Taguchi method was utilized to optimize the injection molding processes of poly(butylene terephthalate) (PBT) and poly(trimethylene terephthalate) (PTT) blends. Impact strength was taken as the optimized property. The significant parameters included mold temperature, injection pressure, holding pressure, injection time and holding temperature. Results of the Taguchi analysis gave mold temperatures as major influencing factor on the impact strength. The optimal processing conditions were determined through the Taguchi method giving an increase of 13.7% in impact strength for the blend. Further analysis was done to distinguish the blends dependency on temperature. Differential scanning calorimetry curves indicated the presence of recrystallization peaks that were dependent on the temperature profile the sample had received prior to testing. Polarized optical microscopy was used to show the different sphereulitic growth patterns under varying isothermal conditions. It was seen that at 90°C sphereulitic growth contained pockets of different sized spereulites. AFM imaging was also used to indicate differences in blended polymer morphology. DOI : 10.3139/217.2714 En ligne : https://drive.google.com/file/d/1QJZHY2zWN9XkPZzjZFpRpQB3IsLTo_82/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19891
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Code-barres Cote Support Localisation Section Disponibilité 15682 - Périodique Bibliothèque principale Documentaires Disponible CFD analysis of the frame invariance of the melt temperature rise in a single-screw extruder / F. Habla in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 5 (11/2013)
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Titre : CFD analysis of the frame invariance of the melt temperature rise in a single-screw extruder Type de document : texte imprimé Auteurs : F. Habla, Auteur ; S. Obermeier, Auteur ; L. Dietsche, Auteur ; O. Kintzel, Auteur ; Olaf Hinrichsen, Auteur Année de publication : 2013 Article en page(s) : p. 463-469 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Etat fondu (matériaux)
Extrudeuse monovis
Fluides newtoniens
Fluides, Mécanique des
Matières plastiques -- Extrusion
Mécanique des fluides numériquesLa mécanique des fluides numérique (MFN), plus souvent désignée par le terme anglais computational fluid dynamics (CFD), consiste à étudier les mouvements d'un fluide, ou leurs effets, par la résolution numérique des équations régissant le fluide. En fonction des approximations choisies, qui sont en général le résultat d'un compromis en termes de besoins de représentation physique par rapport aux ressources de calcul ou de modélisation disponibles, les équations résolues peuvent être les équations d'Euler, les équations de Navier-Stokes, etc.
La CFD a grandi d'une curiosité mathématique pour devenir un outil essentiel dans pratiquement toutes les branches de la dynamique des fluides, de la propulsion aérospatiale aux prédictions météorologiques en passant par le dessin des coques de bateaux. Dans le domaine de la recherche, cette approche est l'objet d'un effort important, car elle permet l'accès à toutes les informations instantanées (vitesse, pression, concentration) pour chaque point du domaine de calcul, pour un coût global généralement modique par rapport aux expériences correspondantes.
Domaines d'application : La CFD est particulièrement employée dans les domaines des transports, pour étudier notamment le comportement aérodynamique des véhicules (automobile, aéronautique, etc) conçus.
La CFD est également utilisée dans le domaine des installations critiques telles que les salles de serveurs. Elle permet de réaliser une représentation 3D de la salle, comprenant toutes les informations relatives aux équipements informatiques, électriques et mécaniques. On obtient une carte graduée des différentes zones de chaleur présentes, ce qui permet de détecter les zones critiques et les points chauds (ou "hot spots").
Polycarbonates
Simulation par ordinateurIndex. décimale : 668.4 Plastiques, vinyles Résumé : In analytical analyses for single-screw extruders the simplified approach of rotating the barrel and keeping the screw fixed is often used instead of rotating the screw and fixing the barrel. Although the flow field is independent of the reference frame, as has already been shown to a satisfactory degree (Rauwendaal etal., 1997), the question of the dependence of the melt temperature rise on the reference frame is still being challenged, e.g. Campbell etal. (2001, 2008). In this work we develop a finite-volume CFD code allowing for the three-dimensional simulation of the flow and temperature rise in both reference frames. The question of frame invariance is addressed by simulating the flow of a Newtonian-like polycarbonate both in a two-dimensional cross-section of a single-screw extruder and in a three-dimensional model with two full turns of the screw. Our results show that the kinematics and the melt temperature rise are equal for screw- and barrel-rotation and thus independent of the reference frame. Furthermore, the presence of a clearance flow has a negligible influence on the temperature rise. Note de contenu : - THEORY : Viscous dissipation - Conservation laws - Single-screw extruder modeling - Fluid rheology - Numerical methodology
- RESULTS AND DISCUSSION : Two-dimensional cross-section - Three-dimensional simulationsDOI : 10.3139/217.2753 En ligne : https://drive.google.com/file/d/14AAGUen3zbK5mQAMOg9aAxXeKRdvNpzK/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19892
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Code-barres Cote Support Localisation Section Disponibilité 15682 - Périodique Bibliothèque principale Documentaires Disponible Simulation study of thermotropic LCPs and prediction of nromal stress difference at high shear rate / A. Rahman in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 5 (11/2013)
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Titre : Simulation study of thermotropic LCPs and prediction of nromal stress difference at high shear rate Type de document : texte imprimé Auteurs : A. Rahman, Auteur ; Rahul K. Gupta, Auteur ; S. N. Bhattacharya, Auteur ; S. Ray, Auteur ; F. Costa, Auteur Année de publication : 2013 Article en page(s) : p. 470-482 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cisaillement (mécanique)
Composites à fibres de verre
IsotropieL'isotropie caractérise l’invariance des propriétés physiques d’un milieu en fonction de la direction. Le contraire de l’isotropie est l’anisotropie.
Modèles mathématiques
polymères cristaux liquides
ViscositéIndex. décimale : 668.4 Plastiques, vinyles Résumé : The shear viscosity and normal stress difference of two filled and two unfilled thermotropic liquid crystal polymer (TLCPs) were studied. The rigid and rod like molecules of TLCPs orientate differently at different shear rates. Under low shear rate, the molecules tend to align in the direction of the flow but also tumble and wagging on their own axis. The abnormal orientation of the molecules also depends upon temperature, fillers contents, aspect ratio and elastic nature of LCP molecules. These behaviors lead to unusual rheological properties of LCPs, such as negative first normal stress difference for filled LCPs at low shear rates. But with the increase of shear rate, the molecules are oriented in the direction of flow, which lead to isotropic flow at high shear rates. The complicated rheological properties and characteristic anisotropic properties of LCPs are modelled by recently developed Leonov’s viscoselastic constitutive equations. Simulation has been carried out using Mathematica software and the characteristic an„isotropic properties of LCPs have been identified. The ex„perimentally measured viscosities at high shear rate have been compared with model predictions. Moreover, the normal stress differences using at high shear rates have been estimated using Leonov’s model, which is experimentally not accessible. Note de contenu : - Normal stress behavior
- Orientation of LCP molecule
- Fiber interaction in LCP composites
- LCPs and fiber orientation in composites
- Rheological models for LCPs
- Leonov's weak nematic viscoelasticity in absence of magnetic field
- Materials
- Experiment
- Aspect ratio of glass fibre
- Simulation of Leonov's model parametersDOI : 10.3139/217.2756 En ligne : https://drive.google.com/file/d/1JPVbfInsdDpifQus6Xojow_aMgICSbZE/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19893
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Code-barres Cote Support Localisation Section Disponibilité 15682 - Périodique Bibliothèque principale Documentaires Disponible Study on mechanical, thermal properties and morphology of biodegradable poly(butylene succinate)/nano-TiO2 composites / C.-W. Zhou in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 5 (11/2013)
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Titre : Study on mechanical, thermal properties and morphology of biodegradable poly(butylene succinate)/nano-TiO2 composites Type de document : texte imprimé Auteurs : C.-W. Zhou, Auteur ; J.-X. Zhao, Auteur ; B. Meng, Auteur ; Z.-H. Wu, Auteur Année de publication : 2013 Article en page(s) : p. 483-487 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alliages polymères
Composites -- Propriétés mécaniques
Composites -- Propriétés thermiques
Dioxyde de titane
Matériaux hybrides
Morphologie (matériaux)
Nanoparticules
Poly-e-caprolactone
Polybutylène succinateIndex. décimale : 668.4 Plastiques, vinyles Résumé : Nanocomposites of Poly(butylene succinate) (PBS) and poly(?-caprolactone) (PCL)-coated nano-TiO2 (C–TiO2) are prepared by melt-blending technique. The influence of high loading C–TiO2 on the microstructure, mechanical, thermal and dynamic rheological properties of pure PBS and its nanocomposites are studied. Scanning Electron Microscope results demonstrate that the surface modification and content of TiO2 are main factors to affect the microstructure of composites. Mechanical tests show that adding C–TiO2 into PBS matrix is an effective way to improve the impact strength of the PBS. Impact property and tensile property are sensitive to different microstructure, the former is distance between particles and the latter is the aggregation of particles. Dynamic rheological tests show that the incorporation of C–TiO2 particles into PBS can improve the elastic properties of PBS nanocomposites and restrict the mobility of PBS chains. Differential scanning calorimeter indicates the addition of C–TiO2 can „increase the crystallization rate but do not influence the main PBS crystals. Depending on the state of composites, the C–TiO2 restricts or improves the mobility of PBS molecules. DOI : 10.3139/217.2750 En ligne : https://drive.google.com/file/d/1u8VwGqMWLEMerm-Qh8Za1nAFdhqwjVnk/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19894
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Code-barres Cote Support Localisation Section Disponibilité 15682 - Périodique Bibliothèque principale Documentaires Disponible Preparation and characterization of bamboo fibers coated with titanium urushiol and its composite materials with polypropylene / F. Yin in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 5 (11/2013)
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Titre : Preparation and characterization of bamboo fibers coated with titanium urushiol and its composite materials with polypropylene Type de document : texte imprimé Auteurs : F. Yin, Auteur ; J. Lin, Auteur ; X. Mao, Auteur ; Y. Deng, Auteur ; Q. Chen, Auteur Année de publication : 2013 Article en page(s) : p. 489-495 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation
Composites à fibres végétales
Composites à fibres végétales -- Propriétés mécaniques
Fibres de bambous
Polypropylène
Poudres
TitaneIndex. décimale : 668.4 Plastiques, vinyles Résumé : Bamboo fibers (BFs) coated with titanium urushiol (BFTiU) was prepared by in situ reaction. Effects of activation time, urushiol concentration, reaction time and butyl titanate concentration etc on the coating ratio of BFTiU were investigated. On the other hand, the BFTiU was characterized by FTIR measurements, scanning electron microscope, thermo gravimetric analysis and differential scanning calorimetry. The results showed that titanium urushiol compound was coated on the BFs by coordination reaction and the coating ratio of BFTiU reached 35% at the optimal preparation condition. It also could be found that BFTiU possessed better heat resistant properties than BFs. Due to titanium urushiol coated on BFs, the elongation at break, the maximum deflection and the bending strength of BFTiU/PP composites were 33%, 30 % and 10% higher than those of BP/PP composites respectively. Particularly, the tensile strength of BFTiU/PP composites was better than that of BP/PP composites at the presence of 70% BFTiU. Note de contenu : - EXPERIMENTAL : Materials - Preparation of bamboo fibers (BFs) - Preparation of bamboo fibers coated with urushiol titanium compounds (BFTiU) - Preparation of BP/PP compsites and BFTiU/PP composites
- CHARACTERIZATIONS : FTIR analysis - Thermogravimetric analysis - Differential scanning calorimetry - Scanning electron microscopie - Mechanical properties
- RESULTS AND DISCUSSION : FTIR analysis - SEM analysis of BFs and BFTiU - Effect of ultrasonic activation time on the coating ratio of BFTiU - Effect of the concentration of urushiol on the coating ratio of BFTiU - Effect of the reaction time on the coating ratio of BFTiU - Thermal degraded process of BFs and BFTiU - Mechanical properties of BP/PP composite and BFTiU/PP - SEM analysis of BP/PP composites and BFTiU/PP compositesDOI : 10.3139/217.2751 En ligne : https://drive.google.com/file/d/13hrU6rANpK8iOPWX8CE-7RIwuB6G_fC7/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19895
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Code-barres Cote Support Localisation Section Disponibilité 15682 - Périodique Bibliothèque principale Documentaires Disponible Effect of the mandrel rotation speed and inner wall cooling Rate on the performance and structure of polypropylene block-copolymer pipe / R. Han in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 5 (11/2013)
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Titre : Effect of the mandrel rotation speed and inner wall cooling Rate on the performance and structure of polypropylene block-copolymer pipe Type de document : texte imprimé Auteurs : R. Han, Auteur ; M. Nie, Auteur ; S.-B. Bai, Auteur ; Q. Wang, Auteur Année de publication : 2013 Article en page(s) : p. 496-505 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Copolymères séquencés
Matières plastiques -- Extrusion
Matières plastiques -- Propriétés mécaniques
Mouvement rotatoire
Polypropylène
TubesIndex. décimale : 668.4 Plastiques, vinyles Résumé : Polypropylene block-copolymer (PP-B) pipes were prepared using a self-designed rotational extrusion processing system. The experimental results showed that though the crystal morphology in the prepared PP-B pipes did not change compared to conventional extrusion, the molecular chains in amorphous region apparently deviated from the axial direction. As a result, in comparison with the conventional extrusion pipes, the mechanical properties in hoop direction and the resistance to crack growth of rotation extrusion PP-B pipes were greatly improved. Furthermore, both the two mechanical properties improved monotonously with increasing mandrel rotation speed and inner wall cooling rate. DOI : 10.3139/217.2761 En ligne : https://drive.google.com/file/d/1yZG4O8sqa8HgUJ1z4PuX3wGPBhKoOPIP/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19896
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Code-barres Cote Support Localisation Section Disponibilité 15682 - Périodique Bibliothèque principale Documentaires Disponible Modification of liquid oxygen compatibility of bisphenol F epoxy resin / M.-J. Liu in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 5 (11/2013)
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Titre : Modification of liquid oxygen compatibility of bisphenol F epoxy resin Type de document : texte imprimé Auteurs : M.-J. Liu, Auteur ; S.-C. Li, Auteur ; Z.-J. Wu, Auteur ; Z. Wang, Auteur ; J.-L. Li, Auteur Année de publication : 2013 Article en page(s) : p. 506-515 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bisphénol F
Epoxydes
HexabromocyclododécaneL'hexabromocyclododécane est un composé aliphatique bromé de formule brute C12H18Br6 considéré comme dangereux pour la santé et retiré progressivement du marché européen à partir du 17 février 20113.
Ce composé est essentiellement utilisé comme agent ignifuge bromé ajouté dans les isolants thermiques. Il est suspecté comme d'autres substances ignifuges d'être un perturbateur endocrinien.
Oxydes d'antimoineLe trioxyde d’antimoine, également appelé trioxyde de diantimoine ou oxyde d’antimoine(III), est un composé inorganique de formule Sb2O3. Il s’agit d’un oxyde d'antimoine se présentant au laboratoire sous la forme d’une poudre blanche, sa forme minérale étant la sénarmontite (cristaux cubiques incolores) ou la valentinite (cristaux orthorhombiques blancs).
La sénarmontite, stable à température ordinaire, se transforme à 570 °C en valentinite, métastable en dessous de cette température.
- Écotoxicologie : En 2022, alors que les mécanismes de toxicité aquatique du Sb sont encore très mal compris, celle de la toxicité moléculaire du Sb(III) l'est plus encore, mais fait l'objet de quelques étude
- Utilisations : Il est utilisé comme agent de synergie avec des composés halogénés pour l'ignifugation5 des polymères et textiles ; opacifiant pour verres, céramiques et émaux ; pigment pour peintures et catalyseur chimique.
OxygèneIndex. décimale : 668.4 Plastiques, vinyles Résumé : In order to improve the compatibility of bisphenol F epoxy resin with the liquid oxygen, the hexabromocyclododecane and the antimony trioxide were added to bisphenol F epoxy resin, and then cured resin was mechanically impacted according to ASTM D-2512-95. The microstructure and the surface element compositions of the specimen before and after the mechanical impact were investigated and analyzed by scanning electron microscopy and X-ray photoelectron spectroscopy, respectively. These results indicated that the addition of the antimony trioxide was favorable to help the hexabromocyclododecane to improve the compatibility of the bisphenol F epoxy resin with liquid oxygen. The liquid oxygen compati„bility mechanism and the synergistic effect of the hexabromo„cyclododecane and antimony trioxide on the improvement of compatibility of bisphenol F epoxy resin with liquid oxygen were analyzed in detail. DOI : 10.3139/217.2764 En ligne : https://drive.google.com/file/d/1tzmQo6mhRWZGchAIkMkXcAJ8pBI_lPbC/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19897
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Code-barres Cote Support Localisation Section Disponibilité 15682 - Périodique Bibliothèque principale Documentaires Disponible Pressure variation during interfacial instability in the coextrusion of low density polyethylene melts / Mike T. Martyn in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 5 (11/2013)
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Titre : Pressure variation during interfacial instability in the coextrusion of low density polyethylene melts Type de document : texte imprimé Auteurs : Mike T. Martyn, Auteur ; P. D. Coates, Auteur Année de publication : 2013 Article en page(s) : p. 516-527 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Etat fondu (matériaux)
Instabilités (physique)
Interfaces solide-liquide
Matières plastiques -- Extrusion
Polyéthylène basse densité
Pression -- Mesure
RhéologieIndex. décimale : 668.4 Plastiques, vinyles Résumé : Pressure variation during the coextrusion of two low density polyethylene melts was investigated. Melt streams were delivered to a die from two separate extruders to converge in a 30°° geometry to form a two layer extrudate. Melt flow in the confluent region and die land to the die exit was observed through side windows of a visualisation cell. Stream velocity ratio was varied by control of extruder screw speeds. Layer thickness ratios producing wave type interfacial instability were quantified for each melt coextruded on itself and for the combined melts. Stream pressures and screw speeds were monitored and analysed. Wave type interfacial instability was present during the processing of the melts at specific, repeatable, stream layer ratios. Increased melt elasticity appeared to promote this type of instability. Analysis of process data indicates little correlation between perturbations in extruder screw speeds and stream pressures. The analysis did however show covariance between the individual stream pressure perturbations. Interestingly there was significant correlation even when interfacial instability was not present. We conclude that naturally occurring variation in extruder screw speeds do not perturb stream pressures and, more importantly, natural perturbations in stream pressures do not promote interfacial instability. Note de contenu : - EXPERIMENTAL : Materials - Coextrusion and rheo-optical arrangment - Process measurements
- RESULTS AND DISCUSSION : Melt rheology and process typical viscoelastic behavior - Critical layer ratios - Process pressure and screw speed correlations - Process pressure variationDOI : 10.3139/217.2786 En ligne : https://drive.google.com/file/d/1BWx2PICGbxTQRgbU3_v-jIEGRxqGmNm5/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19898
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Code-barres Cote Support Localisation Section Disponibilité 15682 - Périodique Bibliothèque principale Documentaires Disponible The effects of processing parameters on the residual wall thickness distribution at the sharp angle corner of water assisted injection molded parts / T. Pudpong in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 5 (11/2013)
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Titre : The effects of processing parameters on the residual wall thickness distribution at the sharp angle corner of water assisted injection molded parts Type de document : texte imprimé Auteurs : T. Pudpong, Auteur ; P. Buahom, Auteur ; I. Satoh, Auteur ; T. Saito, Auteur Année de publication : 2013 Article en page(s) : p. 528-540 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Epaisseur -- Mesure
Matières plastiques -- Moulage par injection
Matières plastiques -- Moulage par injection assistée par eau
Polypropylène
Simulation par ordinateur
TubesIndex. décimale : 668.4 Plastiques, vinyles Résumé : Water-assisted injection molding (WAIM) has been widely used for tubular plastic parts due to its advantages of relatively low cost and fast cycling time. However, the non-uniform distribution of the wall thickness, especially at the sharp corner, is still a basic problem in the WAIM process. This work presents the effects of sharp corner angles on wall thickness distribution in sections near corners for various processing conditions of the WAIM process, including melt temperature, mold temperature, water delay time, water holding time, and holding pressure. Three grades of polypropylene (PP) resins with different melt flow indices were studied using seven mold geometries that varied the angle of the sharp corner section. The wall thickness distribution at the corner sections were characterized in terms of inner and outer residual wall thicknesses, hollow core ratio, and the percentage of difference between the inner and outer wall thicknesses. In addition, computational fluid dynamic simulations with Moldflow Plastics Insight version 4.1 were performed for each sharp corner angle. It was found that the wall thickness distribution of the straight tube was more uniform than those of the curve tubes. Water injection delay time and water pressure were the major parameters that had a significant impact on the hollowed core ratios, while the percent difference between inner and outer wall thicknesses was mainly influenced by melt temperature. Note de contenu : - EXPERIMENTAL PROCEDURE : Materials - Injection molding machine and mold - Process parameters - Characterization - Simulation
- RESULTS AND DISCUSSION : Relationship between shear rate and inner residual wall thickness - Effect of MFI on residual wall thickness distribution - Effect of melt temperatures on residual wall thickness distribution - Effect of mold temperature on residual wall thickness distribution - The effect of water delay time on residual wall thickness distribution - The effect of water pressure on residual wall thickness distribution - The effect of water holding time on residual wall thickness distribution - Stifness - Inner surface roughness - Switchover mark - Microscopic observationDOI : 10.3139/217.2792 En ligne : https://drive.google.com/file/d/1fjKjyjWOGlo3-G8uXFzpKHhITn1nsyA2/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19899
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Code-barres Cote Support Localisation Section Disponibilité 15682 - Périodique Bibliothèque principale Documentaires Disponible The influence of extrusion conditions on mechanical and thermal properties of virgin and recycled PP, HIPS, ABS and their ternary blends / Erik Stenvall in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 5 (11/2013)
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Titre : The influence of extrusion conditions on mechanical and thermal properties of virgin and recycled PP, HIPS, ABS and their ternary blends Type de document : texte imprimé Auteurs : Erik Stenvall, Auteur ; S. Tostar, Auteur ; A. Boldizar, Auteur ; J. Foreman, Auteur Année de publication : 2013 Article en page(s) : p. 541-549 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alliages polymères
Compatibilité chimique et physique
Matières plastiques -- Extrusion
Matières plastiques -- Propriétés mécaniques
Matières plastiques -- Propriétés thermiques
Matières plastiques dans les équipements électriques et électroniques -- Recyclage
Polypropylène
Polystyrène choc
Terpolymère acrylonitrile butadiène styrèneIndex. décimale : 668.4 Plastiques, vinyles Résumé : A recyclable plastics waste stream of electrical and electronic equipment has previously been found to contain acrylonitrile-butadiene-styrene copolymer (ABS, ?40 wt%), high impact polystyrene (HIPS, ?40 wt%), polypropylene (PP, ?10wt%) and a rest fraction consisting mainly of other styrene-based thermoplastics. In this work, one virgin and one recycled ternary blend consisting of these three components were melt-blended in an extruder to study the influence of processing conditions on the mechanical and thermal properties. The aim of the work has been to understand the inherent compatibility between ABS, HIPS and PP without added compatibilisers, in order to investigate the recycling potential of a real recyclable WEEE plastics fraction. Favourable processing conditions with respect to tensile properties of the virgin blend were found at intermediate screw rotations (40 to 80min–1) and relatively low barrel temperatures (170 to 220°C), which can be understood from the low onset of thermo-oxidative degradation at 200°C. The recycled blend and recycled ABS, HIPS and PP showed higher stiffness and yield stress, but lower elongation at break than the corresponding virgin materials. The stiffness and yield stress of the blends were found mainly to follow the rule of mixtures of their components while the elongation at break exhibited adverse characteristics indicating incompatibility between ABS, HIPS and PP. The significant variations in the elongation at break of the blends appeared to be due to the ABS component. Differential scanning calorimetry showed an additional melt peak for the recycled blend compared to the virgin blend, otherwise the transitions were similar. The additional peak could be assigned to polyethylene in the PP component. The onset of the thermo-oxidative degradation was found to be at almost 190°C in the case of the recycled blend, which was high considering that it was close to that of the virgin blend and higher than expected from the rule of mixtures of the recycled components. Note de contenu : - Pre-study
- Influence of processing parameters on a virgin ternary blend (TBV)
- Mechanical properties
- Thermal propertiesDOI : 10.3139/217.2801 En ligne : https://drive.google.com/file/d/1vn22ykMr8JThKEZ119VmqTviQO8wySt4/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19900
in INTERNATIONAL POLYMER PROCESSING > Vol. XXVIII, N° 5 (11/2013) . - p. 541-549[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 15682 - Périodique Bibliothèque principale Documentaires Disponible Influence of mold temperature on mold filling behavior and part properties in micro injection molding / S. Meister in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 5 (11/2013)
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Titre : Influence of mold temperature on mold filling behavior and part properties in micro injection molding Type de document : texte imprimé Auteurs : S. Meister, Auteur ; Dietmar Drummer , Auteur
Année de publication : 2013 Article en page(s) : p. 550-557 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Homopolymères
Matières plastiques -- Moulage par injection
Matières plastiques -- Propriétés mécaniques
Morphologie (matériaux)
Moules d'injection
Polyamide 66
Polymères -- Effets des hautes températures
Polymères semi-cristallins
Polypropylène
Rhéologie
Structure cristalline (solide)Index. décimale : 668.4 Plastiques, vinyles Résumé : A variety of polymer parts used in microsystems technology is manufactured by injection molding processes. Particularly the high cooling velocity negatively affects the process and the resulting part properties. The scope of this paper is to investigate the influence of the mold temperature during the injection phase on the melt flow and the mold filling as well as on the resulting part properties. The results indicate that an increasing mold temperature supports the filling behavior, although the injection pressure has more impact. An increasing mold temperature also influences the part properties. It was found that a higher mold temperature leads to a more homogeneous and spherulitic structure as well as to an increasing degree of crystallinity. As a consequence the mechanical part properties are affected, too. Note de contenu : - EXPERIMENTAL SETUP : Materials - Specimens - Processing - Characterization
- RESULTS AND DISCUSSION : Filling behavior - Morphology - Crystallinity - Mechanical propertiesDOI : 10.3139/217.2804 En ligne : https://drive.google.com/file/d/1Ld73P5zS7RFkiNY0TLSk4bSvOODfwiib/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19901
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Code-barres Cote Support Localisation Section Disponibilité 15682 - Périodique Bibliothèque principale Documentaires Disponible On the pressure dependency of the Bagley correction / Peter Van Puyvelde in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 5 (11/2013)
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Titre : On the pressure dependency of the Bagley correction Type de document : texte imprimé Auteurs : Peter Van Puyvelde, Auteur ; A. Vananroye, Auteur ; A.-S. Hanot, Auteur ; M. Dees, Auteur ; M. Mangnus, Auteur ; N. Hermans, Auteur Année de publication : 2013 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bagley, Correction de
Etat fondu (matériaux)
Polycarbonates
Pression -- Mesure
Rhéologie
Rhéométrie
ViscositéIndex. décimale : 668.4 Plastiques, vinyles Résumé : The effect of pressure on the viscosity of polymer melts is an often forgotten parameter due to the inherent difficulty to measure this quantity. Different experimental approaches have already been undertaken in literature in the past. A popular methodology to measure the pressure dependence of the viscosity is to use a capillary rheometer equipped with a counter pressure chamber in which the exit pressure can be controlled. In order to process the data, one of the key elements is the Bagley correction that is required to determine the correct entrance pressure at a specific shear rate. In all analysis approaches presented in literature on data at controlled exit pressure, the Bagley correction was always de„termined at atmospheric exit pressure, disgarding possible effects of an enhanced exit pressure. In this paper, a new analytical approach is presented that for the first time allows for a direct assessment of the entrance pressures obtained when capillary measurements are performed with controlled counter pressures. It is demonstrated, using polycarbonate, that the entrance pressure correction needed to obtain correct viscosity values under pressure is significantly different than the one needed to correct measurements performed at atmospheric exit pressure. Note de contenu : - MATERIALS AND METHODS
- ANALYSIS OF NON-LINEARITIES IN BAGLEY PLOTS WITH AND WITHOUT COUNTER PRESSURE : Bagley plots at atmospheric exit pressure - Bagley plots at elevated exit pressure
- EXPERIMENTAL RESULTS : Bagley plots at atmospheric exit pressure - Bagley plots at elevated exit pressuresDOI : 10.3139/217.2839 En ligne : https://drive.google.com/file/d/1KYbOEUd1uVr_lWf07y7PZfLM4LgCV5HG/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19902
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Code-barres Cote Support Localisation Section Disponibilité 15682 - Périodique Bibliothèque principale Documentaires Disponible
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Code-barres | Cote | Support | Localisation | Section | Disponibilité |
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15682 | - | Périodique | Bibliothèque principale | Documentaires | Disponible |