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Rheology and processing of tetrafluoroethylene/hexafluoropropylene copolymers in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 2 (05/2012)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVII, N° 2 (05/2012) . - p. 167-180 Titre : Rheology and processing of tetrafluoroethylene/hexafluoropropylene copolymers Type de document : texte imprimé Année de publication : 2012 Article en page(s) : p. 167-180 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Extrusion capillaire Fluoroélastomères Rhéologie Rhéométrie Index. décimale : 668.9 Polymères Résumé : The rheology and processing of tetrafluoroethylene/hexafluoropropylene (TFE/HFP) copolymers and TFE/HFP/per-fluoro( alkyl vinyl ether) (TFE/HFP/PAVE) terpolymers, also known as FEP polymers, are reviewed in this paper. Dynamic linear viscoelasticity and other fundamental rheological properties such as the critical molecular weight for the onset of entanglements, Mc, the zero-shear viscosity versus molecular weight relationship, dependence of rheology on thermal history and aspects of shear-induced crystallization are presented. The melt fracture and wall slip behavior of FEP resins is also discussed. Finally, possible processing aids that can be used in the extrusion of FEP resins in order to postpone melt fracture phenomena to higher flow rates are also discussed thoroughly. Note de contenu : - CHEMICAL STRUCTURE OF FLUOROPOLYMERS : Tetrafluoroethylene/hexafluoropropylene (TFE/HFP or FEP) copolymers - RHEOLOGY OF TFE/HFP POLYMERS : Materials and characterisation - Rheological measurements(Low melting point FEP) - Rheological measurement (highmelting point FEP) - Effect of preheating on rheological measurements - Rheological measurements (terpolymers TFE/HFP/PAVE (group C) - PROCESSING OF FEP POLYMERS : The flow curve of FEP resins - The effect of pressure on the flow curve of FEP resins - Wall slip - The effect temperature on capillary extrusion - Comparison of the processability of various FEP resins - Processing aids for FEP resins DOI : 10.3139/217.2539 En ligne : https://drive.google.com/file/d/1v_Je-QtaRmsY3arxzFEpfse289vT1PTy/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=14592 [article]

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Foaming behavior and mechanical properties of microcellular PP/SiO2 composites / W. Gong in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 2 (05/2012)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVII, N° 2 (05/2012) . - p. 181-186 Titre : Foaming behavior and mechanical properties of microcellular PP/SiO2 composites Type de document : texte imprimé Auteurs : W. Gong, Auteur ; K. J. Liu, Auteur ; C. Zhang, Auteur ; J. H. Zhu, Auteur ; L. He, Auteur Année de publication : 2012 Article en page(s) : p. 181-186 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Dioxyde de silicium Matériaux hybrides Mousses plastiques -- Propriétés mécaniques Nanoparticules Polypropylène Index. décimale : 668.9 Polymères Résumé : Microcellular foamed polypropylene (PP)/SiO2composites were prepared by using micro-SiO2and nano-SiO2particles. The effects of the particle size of SiO2on the foaming behavior and mechanical properties of the composites were studied based on heterogeneous nucleation theory. The results showed that the silica facilitated the cell nucleation to some extent. The average cell size of 16.3 µm and the cell density of 4.46 × 107cells/cm3were achieved for the composite foam at the silica content of 4 wt.%. The plastic deformation of the PP was strongly constrained due to the presence of the nano-silica. The tensile and impact strength of the nano-SiO2composite foam are larger than those of the micro-SiO2composite foam due to the high crack propagation resistance in the microcellular PP/nano-SiO2composite. Note de contenu : - EXPERIMENT : Materials - Preparation of PP/SiO2 masterbatch - Preparation of microcellular PP composites - Characterisation - Mechanical measurement - RESULTS AND DISCUSSION : Cell nucleation behavior of PP/SiO2 composites - Foaming behavior of PP/SiO2 composite - Effect of specific surface area on the foaming behavior of microcellular PP/SiO2 composite - Effect of the crystallization behavior on the foaming behavior of microcellular PP/SiO2 composite - Effect of SiO2 particle size on the cell structure of microcellular PP/SiO2 composite - Effect of SiO2 particle size on the mechanical properties in microcellular PP/SiO2 composite DOI : 10.3139/217.2458 En ligne : https://drive.google.com/file/d/19IHnKv4qmPGhf7pVIZhPWqe8Ad1voSRa/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=14593 [article]

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Preparation and properties of EPDM/NBR/organoclay nanocomposites / M. Ersali in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 2 (05/2012)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVII, N° 2 (05/2012) . - p. 187-195 Titre : Preparation and properties of EPDM/NBR/organoclay nanocomposites Type de document : texte imprimé Auteurs : M. Ersali, Auteur ; N. Fazeli, Auteur ; Ghasem Naderi, Auteur Année de publication : 2012 Article en page(s) : p. 187-195 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse thermique Analyse thermomécanique dynamique Argile Caoutchouc nitrile-butadiène Diffractométrie de rayons X Ethylène-propylène-diène monomère Matériaux hybrides Matériaux hybrides -- Propriétés mécaniques Microscopie électronique à balayage Montmorillonite Index. décimale : 668.9 Polymères Résumé : In this research work, three different types of nano-composites based on EPDM/NBR blend (70/30 wt.%) have been prepared: one type including Cloisite 20A in EPDM phase, the other one containing Cloisite 30B in NBR phase and the third type consisting of Cloisite 20A in EPDM and Cloisite 30B in NBR phases simultaneously (called EN-xAB). XRD and TEM techniques showed intercalated or exfoliated structures for all types of nano-composites. According to SEM results, the most roughness of the surface was observed at EN-xAB nano-composites. Cure characteristics of the samples showed that the lowest scorch and cure time and highest crosslink density was devoted to EN-xAB samples. Comparison of mechanical properties of the nano-composites showed that the best properties were found in the samples consisted of both types of organo-clays simultaneously. Note de contenu : - EXPERIMENTAL : Materials - Sample preparation - Characterization - RESULTS AND DISCUSSION : X-ray diffraction - Scanning Electron Microscopy (SEM) - Cure behavior - Differential scanning calorimetry (DSC) - Dynamic Mechanical Thermal Analysis (DMTA) - Mechanical properties DOI : 10.3139/217.2464 En ligne : https://drive.google.com/file/d/1Hh3peL-CgYrN8Y4NQQCrlOg3MlqKVXIJ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=14594 [article]

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Mechanical and morphological properties of flax fiber reinforced high density polyethylene/recycled rubber composites in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 2 (05/2012)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVII, N° 2 (05/2012) Titre : Mechanical and morphological properties of flax fiber reinforced high density polyethylene/recycled rubber composites Type de document : texte imprimé Année de publication : 2012 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caoutchouc styrène-butadiène Composites à fibres végétales -- Propriétés mécaniques Lin et constituants Le lin cultivé (Linum usitatissimum) est une plante annuelle de la famille des Linaceae cultivée principalement pour ses fibres, mais aussi pour ses graines oléagineuses. Les fibres du lin permettent de faire des cordes, du tissu (lin textile pour ses qualités anallergiques, isolantes et thermorégulateurs), ou plus récemment des charges isolantes pour des matériaux de construction. Les graines sont utilisées pour produire de l'huile de lin pour l'industrie de l'encre et de la peinture, pour la consommation humaine et animale, à cause de sa richesse en oméga 3. Le lin est une des rares fibres textiles végétales européennes. Elle a comme caractéristiques la légereté, la rigidité et la résistance et comme particularité d'être une fibre longue (plusieurs dizaines de centimètres), par rapport aux fibres courtes (coton, chanvre) ou moyennes (laine). Microscopie électronique à balayage Polyéthylène haute densité Réaction de couplage Index. décimale : 668.9 Polymères Résumé : In this work, the mechanical and morphological properties of high density polyethylene (HDPE)/flax fiber composites are reported. In particular, the effect of adding a rubber phase (SBR) in terms of recycled ground tire rubber (GTR) is determined. Samples with different concentrations of flax fibers and rubber powders were prepared. Also, the addition of a coupling agent (SEBS) on both matrix-fiber and matrix-rubber surface adhesion and composite morphology is investigated. The results show an improvement in both matrix-rubber and matrix-fiber surface adhesion after incorporation of the coupling agent leading to improved tensile and flexural properties. Also, impact strength results showed a toughening effect of the HDPE matrix by flax and SBR addition. Note de contenu : - EXPERIMENTAL METHODS : Materials - Compounding - Mechanical testing - Density - Morphology - Optical microscopy - RESULTS AND DISCUSSION : Fiber dimensions - Density analysis - Tensile properties - Flexural modulus - Impact strength DOI : 10.3139/217.2473 En ligne : https://drive.google.com/file/d/1BCOZxNU4QR_qLe-6_mSsp1Cc4ACLlMgf/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=14612 [article]

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Global/local analysis of filling behavior during injection molding for a large scale plate with micro patterns / S. H. Park in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 2 (05/2012)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVII, N° 2 (05/2012) . - p. 205-212 Titre : Global/local analysis of filling behavior during injection molding for a large scale plate with micro patterns Type de document : texte imprimé Auteurs : S. H. Park, Auteur ; S. M. Kim, Auteur ; S. Y. Kang, Auteur ; W. I. Lee, Auteur ; Y. E. Yoo, Auteur Année de publication : 2012 Article en page(s) : p. 205-212 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Matières plastiques -- Moulage par injection Tags : 'Modèle  Hele-Shaw'  'Moule  injection'  'Remplissage  miscrostructures'  'Analyse  numérique' Index. décimale : 668.9 Polymères Résumé : Injection mold filling process was analyzed for a rectangular plate with micro patterns on the surface. For products with micro patterns whose dimensions are much larger than the dimensions of the micro patterns, numerical analysis may require a prohibitively large number of numerical grids. In order to solve this problem, analysis was done by separating the global flow through the base plate from the filling of the micro patterns. Global flow was analyzed using the generalized Hele-Shaw (GHS) model, while local flow for micro patterns was simulated by the Navier-Stokes equation. The boundary conditions, such as pressure and temperature, for the local analysis were obtained using the results of the global analysis. The proposed method was validated by experiments. Experimental observation showed good agreement with the numerical results. Effect of process parameters on the transcription fidelity was further examined. The numerical approach presented in this paper would enable a more efficient analysis and provide better understanding of filling behavior during injection molding of parts with micro patterns on the surface. Note de contenu : - SIMULATION PROCEDURE : Governing equations - Numerical approach for micro filling behavior - Boundary conditions for the local flow into the micro patterns - Transcription fidelity - EXPERIMENT : Injection mold and material - Injection molding conditions - Measurement of cavity pressure and mold temperature - RESULTS : Effect of base plate thickness - Effect of injection speed - Verification of the proposed method - Changes of the transcription fidelity with time DOI : 10.3139/217.2485 En ligne : https://drive.google.com/file/d/1y5Rr8xRPpuSGiQPFj2iyCgTeb64_tGKO/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=14654 [article]

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Using multi-objective evolutionary algorithms for optimization of the cooling system in polymer injection molding / C. Fernandes in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 2 (05/2012)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVII, N° 2 (05/2012) . - p. 213-223 Titre : Using multi-objective evolutionary algorithms for optimization of the cooling system in polymer injection molding Type de document : texte imprimé Auteurs : C. Fernandes, Auteur ; A. J. Pontes, Auteur ; J. C. Viana, Auteur ; A. Gaspar-Cunha, Auteur Année de publication : 2012 Article en page(s) : p. 213-223 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Algorithmes génétiques Matières plastiques -- Moulage par injection Systèmes de refroidissement Index. décimale : 668.9 Polymères Résumé : The cooling process in polymer injection molding is of great importance as it has a direct impact on both productivity and product quality. In this paper a Multi-objective Optimization Genetic Algorithm, denoted as Reduced Pareto Set Genetic Algorithm with Elitism (RPSGAe), was applied to optimize both the position and the layout of the cooling channels in the injection molding process. The optimization model proposed in this paper is an integration of genetic algorithms and Computer-Aided Engineering, CAE, technology applied to polymer process simulations. The main goal is to implement an automatic optimization scheme capable of defining the best position and layout of the cooling channels and/or setting the processing conditions of injection moldings. In this work the methodology is applied to an L-shape molding with the aim of minimizing the part warpage quantified by two different conflicting measures. The results produced have physical meaning and correspond to a successful process optimization. Note de contenu : - Development of the optimization system - Case study - Results : Analysis of modelling results - Processing conditions optimization results - Cooling channels design optimization results - Optimization with cold runners - Simultaneous processing conditions and cooling channels design optimization results DOI : 10.3139/217.2511 En ligne : https://drive.google.com/file/d/1XWEoOP36g342emr4YzfxniQiKx5VVpUz/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=14689 [article]

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Parameters affecting the ink wash-off in in-mold decoration of injection molded parts / S.-J. Liu in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 2 (05/2012)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVII, N° 2 (05/2012) . - p. 224-230 Titre : Parameters affecting the ink wash-off in in-mold decoration of injection molded parts Type de document : texte imprimé Auteurs : S.-J. Liu, Auteur ; C.-M. Hsu, Auteur ; P.-W. Chang, Auteur Année de publication : 2012 Article en page(s) : p. 224-230 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Composites à fibres de verre Décoration dans le moule Encre Matières plastiques -- Décoration Matières plastiques -- Moulage par injection Polyéthylène téréphtalate Simulation par ordinateur Taguchi, Méthodes de (Contrôle de qualité) Index. décimale : 668.9 Polymères Résumé : Ink wash-off has been one of the problems that has confounded the overall success of the in-mold decoration (IMD) process for injection molded parts. In this report, an experimental matrix design based on the Taguchi method was conducted to examine the influence of processing parameters on the ink washoff of molded parts. The resins used in the study were 20% glass fiber filled poly(ethylene terephthalate) (PET). A commercially available PET film pre-printed with grids was employed to prepare the parts. Specimens of three different thicknesses were molded using a pin injection gate on an injection molding machine with a reciprocating screw system. After molding, the severity of ink washoff was determined by an image analysis program. The experimental results suggested that molded composite parts of smaller thicknesses exhibited more severe ink washoff. For the parameters selected in the experiments, the melt temperature and mold temperature were found to be the principal factors affecting the ink failure of IMD injection molded composites. Furthermore, numerical simulations using a commercially available code were completed to better understand the mechanism of the ink washoff problem. The calculated results suggested that the ink was mainly washed off by the high shear stress of hot polymer melts. It is shown that the formation mechanisms of ink washoff can be explained, and, this being done, steps can be taken to ensure that the washoff is minimized. This provides significant advantages in terms of improved product quality. Note de contenu : - EXPERIMENTAL PROCEDURE : materials and experimental setup - Molding parameters - NUMERICAL SIMULATION - RESULTS AND DISCUSSION : Process optimization - Significance of processing parameters DOI : 10.3139/217.2506 En ligne : https://drive.google.com/file/d/1vuZ9MRHr0ql057jAQNn0oW8SfCqLmQi7/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=14690 [article]

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Improving the processability of water-soluble films based on filled thermoplastic polyvinyl alcohol / Bo Shi in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 2 (05/2012)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVII, N° 2 (05/2012) . - p. 231-236 Titre : Improving the processability of water-soluble films based on filled thermoplastic polyvinyl alcohol Type de document : texte imprimé Auteurs : Bo Shi, Auteur ; G. Wideman, Auteur ; J. H. Wang, Auteur Année de publication : 2012 Article en page(s) : p. 231-236 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alcool polyvinylique Carbonate de calcium Le carbonate de calcium (CaCO3) est composé d'un ion carbonate (CO32-) et d'un ion calcium (Ca2+), sa masse molaire est de 100,1 g/mole. C'est le composant principal du calcaire et de la craie, mais également du marbre. C'est aussi le principal constituant des coquilles d'animaux marins, du corail et des escargots. Films plastiques Films plastiques -- Propriétés mécaniques Polymères -- Solubilité 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. Index. décimale : 668.9 Polymères Résumé : Melt extrusion of polyvinyl alcohol (PVOH) is desirable over commonly practiced solution film casting due to reduced energy input, environmental footprint, and processing cost, however, melt extrusion processing of plasticized polyvinyl alcohol (PVOH) presents a significant processing challenge due to inherent adhension issues of extruded PVOH film to the surface of equipment. This paper reports a method using inorganic fillers such as CaCO3and talc to facilitate the plasticized PVOH processing for blown films. Parameters are also identified for additional process studies to optimize the mechanical properties of blown films. It was found that the preferred inorganic filler is CaCO3for the PVOH stickiness reduction. The filled PVOH films were found to have delayed or reduced water solubility. It takes about 7 to 10 minutes for the filled PVOH films to dissolve in water whereas the neat PVOH films are soluble in water instantly. The delayed water solubility may be desirable for certain specialty applications such as packaging of pesticides during shipping and storage. With improved processability by incorporating filler, the melt extrusion produced PVOH film should cost less than the solution-cast PVOH films. Note de contenu : - EXPERIMENTAL : Materials - Plasticizing - Compounding - Melt viscosity - Blown film - Scanning Electron Microscopy - Tensile property test - RESULTS AND DISCUSSION : Melt rheology - Resolving PVOH film adhesion issue - Filled PVOH modulus - Filled PVOH peak stress - Filled PVOH elongation - Film structure - Filled PVOH water solubility DOI : 10.3139/217.2517 En ligne : https://drive.google.com/file/d/1NnMi0Sow1cc2cIO_GWZSIDf-zG16EtuV/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=14692 [article]

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Molecular orientation behavior of isotactic polypropylene films under uniaxial and biaxial deformation at elevated temperatures / S. Yoshida in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 2 (05/2012)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVII, N° 2 (05/2012) . - p. 237-244 Titre : Molecular orientation behavior of isotactic polypropylene films under uniaxial and biaxial deformation at elevated temperatures Type de document : texte imprimé Auteurs : S. Yoshida, Auteur ; T. Sawada, Auteur ; T. Kawamura, Auteur ; K. Nitta, Auteur Année de publication : 2012 Article en page(s) : p. 237-244 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Contraintes (mécanique) Déformations (mécanique) Films plastiques Matériaux -- Déformations géométriques et dimensionnelles Orientation moléculaire (matériaux) Polymères -- Effets des hautes températures Polypropylène Index. décimale : 668.9 Polymères Résumé : In-situ molecular orientation behavior of isotactic polypropylene films prepared by quenching at 0 ºC was investigated under uniaxial and biaxial extension at elevated temperatures. Both the retardation value of film and the stress were simultaneously measured during stretching. The stress required to deform films depended on the stretching temperature, but the retardation was nearly independent of temperature. DOI : 10.3139/217.2527 En ligne : https://drive.google.com/file/d/1p9NXvcVfdamjwve1G-31kkZxUwPd9Pxv/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=14693 [article]

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A study of fiber breakage during compounding in a buss kneader / J. Ville in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 2 (05/2012)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVII, N° 2 (05/2012) . - p. 245-251 Titre : A study of fiber breakage during compounding in a buss kneader Type de document : texte imprimé Auteurs : J. Ville, Auteur ; F. Inceoglu, Auteur ; N. Ghamri, Auteur ; J. L. Pradel, Auteur ; A. Durin, Auteur ; Rudy Valette, Auteur ; Bruno Vergnes, Auteur Année de publication : 2012 Article en page(s) : p. 245-251 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Composites à fibres de verre Fibres de verre -- Rupture Malaxeurs et mélangeurs Polyamides Un polyamide est un polymère contenant des fonctions amides -C(=O)-NH- résultant d'une réaction de polycondensation entre les fonctions acide carboxylique et amine. Selon la composition de leur chaîne squelettique, les polyamides sont classés en aliphatiques, semi-aromatiques et aromatiques. Selon le type d'unités répétitives, les polyamides peuvent être des homopolymères ou des copolymères. Index. décimale : 668.9 Polymères Résumé : This paper is devoted to the study of fiber breakage during compounding with a polyamide matrix in a Buss kneader. Results showed a drastic decrease of glass fiber length during compounding, typically from 3 500 to 350 µm. Fiber breakage depended on processing conditions: it increased with screw speed, but the effect of feed rate was less clear. Fiber breakage increased also with the severity of the screw profile. Characterizations of fiber length evolution along the screw profile have also been performed after dead-stop experiments. Generally speaking, fiber length evolution can be described using a modified Shon-Liu-White model, in which either the number of turns or the specific energy is considered. Note de contenu : - EXPERIMENTAL : Materials - Compouding procedure - Morphological characterization - RESULTS AND DISCUSSION : Processing parameters - Evolution of fiber lengths with processing conditions - Evolution of fiber lengths along the screw DOI : 10.3139/217.2525 En ligne : https://drive.google.com/file/d/10KvG58M4F9d3a_QanMT6qoQTSWqks3m7/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=14694 [article]

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Peel adhesive properties of polymer laminates composed of polyethylenes and polypropylenes in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 2 (05/2012)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVII, N° 2 (05/2012) Titre : Peel adhesive properties of polymer laminates composed of polyethylenes and polypropylenes Type de document : texte imprimé Année de publication : 2012 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adhésion Polyéthylène Polypropylène Stratifiés Index. décimale : 668.9 Polymères Résumé : Peel adhesive strengths of multi-layered laminates composed of two polypropylene (PP) sheets and an inserted polyethylene (PE) layer (the middle layer) between the PP layers were evaluated. PE-glycidyl methacrylate (GMA) copolymers and a maleic-anhydride grafted PP (MAPP) were compared to the PE homopolymer and the PP homopolymer. The peel adhesive strength of PE-GMA/MAPP laminates was much higher than that of PE homopolymer/PP homopolymer laminates. Meanwhile, the blends composed of the PE-GMA and three types of PE homopolymer (PE-GMA+LDPE, PE-GMA+MDPE, PE-GMA+HDPE) were formulated as the PE middle layer of the multi-layered laminates. The PE blends had the same amount of glycidyl groups, and the deformation capacity was different in each. Namely, the PE blend of LDPE had higher elongation to break than the PE blend of HDPE. The peel adhesive strength of the multi-layered laminates with the middle layer of the LDPE blend was highest among the three types of laminates with the middle layer of the PE blends. Scanning electron microscopy on the fractured surfaces revealed that the large plastic deformation of the LDPE blended middle layer was responsible for the high energy absorption, and resulted in the high peel strength. Note de contenu : - EXPERIMENTAL : Materials - Surface analysis - Laminates - Delamination test - Tensile tests - Observation of fracture surfaces - RESULTS AND DISCUSSION : Tensile stress-strain curves of PE - Surface analysis of polymer sheets - Fracture surfaces DOI : 10.3139/217.2531 En ligne : https://drive.google.com/file/d/1tus9nTZzIK8nVDam24whuk7QSHqdEEVE/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=14695 [article]

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Tubing extrusion of a fluoropolymer melt / Evan Mitsoulis in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 2 (05/2012)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVII, N° 2 (05/2012) . - p. 259-269 Titre : Tubing extrusion of a fluoropolymer melt Type de document : texte imprimé Auteurs : Evan Mitsoulis, Auteur ; Savvas G. Hatzikiriakos, Auteur Année de publication : 2012 Article en page(s) : p. 259-269 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Fluides, Mécanique des Fluoropolymères Matières plastiques -- Extrusion:Polymères -- Extrusion Rhéologie Simulation par ordinateur Tubes Viscoélasticité Index. décimale : 668.9 Polymères Résumé : The tubing extrusion-forming process of a fluoropolymer (FEP) melt was studied both experimentally and numerically. The flow behaviour of a FEP resin was determined by using a tubular die used in industrial-scale operations and these data were compared with simulation results using (i) a viscous model (Cross) and (ii) a viscoelastic one (the Kaye – Bernstein, Kearsley, Zapas / Papanastasiou, Scriven, Macosko or K-BKZ/PSM model) in order to assess the viscoelastic effects. In all simulations, compressibility, thermal and pressure effects on viscosity were taken into account. It was found that the viscoelastic results for the pressure, and hence the stresses at the wall, were always higher than the viscous results. Both were higher than the experimental results. A quadratic slip model plus viscoelasticity was found necessary to reproduce the experiments. The smooth flow curves resulting from this industrial tubular-coating die are a further manifestation that this is an appropriate design for coating fluoropolymers at very high apparent shear rates, exceeding 5 000 s–1. Note de contenu : - Governing equations and rheological modelling - Method of solution - Experimental results - Numerical results : No slip at the wall - Slip at the wall DOI : 10.3139/217.2534 En ligne : https://drive.google.com/file/d/1m9ZIvDE92vkx1fkOdHXNvPJsMNAfISyU/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=14696 [article]

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Functionalization of polystyrene with cyclic anhydrides and their spectroscopic, adhesive and corrosive characterizations / I. L. Onder in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 2 (05/2012)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVII, N° 2 (05/2012) . - p. 270-276 Titre : Functionalization of polystyrene with cyclic anhydrides and their spectroscopic, adhesive and corrosive characterizations Type de document : texte imprimé Auteurs : I. L. Onder, Auteur ; Ahmet Okudan, Auteur Année de publication : 2012 Article en page(s) : p. 270-276 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acylation Adhésion Analyse spectrale Anhydrides Anticorrosion Fourier, Spectroscopie infrarouge à transformée de Polystyrène Résonance magnétique nucléaire Index. décimale : 668.9 Polymères Résumé : Polystyrene (PS) has been chemically modified with cyclic anhydrides such as glutaric anhydride (GA), citraconic anhydride (CA) and phthalic anhydride (PA) in the presence of BF3.O(C2H5)2in chloroform and succinic anhydride (SA) in 1,2-dichloroethane. Some important reaction parameters were determined in order to optimize the acylation process. ATR FTIR and1H NMR studies indicate that the acylation reaction can introduce both carboxyl group and double bond (for only citraconic anhydride) onto pendant aromatic groups of the polymer. The adhesion properties and corrosion resistance of the acylated PS on metal surface under various conditions have been investigated. Note de contenu : - EXPERIMENTAL : Materials - Chemical modifications of polystyrene with cyclic anhydrides (general procedure) - Measurements and analyses - Chemical analysis - Determination of coating properties - Determination of adhesion properties - RESULTS AND DISCUSSION : Synthesis - HNMR analysis - Adhesion and corrosion resistance properties DOI : 10.3139/217.2536 En ligne : https://drive.google.com/file/d/1EEUYMiySZVC5LF2pMUPiLim_lJuJznpz/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=14697 [article]

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