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INTERNATIONAL POLYMER PROCESSING / Polymer Processing Society . Vol. XXII, N° 4Mention de date : 09/2007Paru le : 05/09/2007 |
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Ajouter le résultat dans votre panierCharacteristic curves based on 3D non-isothermal flow computations in single-screw extruder for non-newtonian fluids / A. Khalifeh in INTERNATIONAL POLYMER PROCESSING, Vol. XXII, N° 4 (09/2007)
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Titre : Characteristic curves based on 3D non-isothermal flow computations in single-screw extruder for non-newtonian fluids Type de document : texte imprimé Auteurs : A. Khalifeh, Auteur ; Jean-Robert Clermont, Auteur Année de publication : 2007 Article en page(s) : p. 324-333 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : This paper presents numerical applications of a finite-volume method to steady three-dimensional non-isothermal inertial flows in geometries related to a single-screw extruder, with the purpose to provide characteristic curves related to rheological parameters, geometrical and operating conditions. We consider incompressible fluids obeying Newtonian, non-Newtonian Carreau-Yasuda equations with different shear-thinning properties. The temperature dependence is described by a Williams-Landel-Ferry (WLF) equation. For discretizing the equations and unknowns, we use a staggered grid and solve the set of governing equations by a decoupled algorithm. The numerical results are presented in different gap conditions and allow us to state the rheological parameters, the screw parameters and the rotational velocity on the flow characteristics in a screw-barrel system. DOI : 10.3139/217.0005 En ligne : https://drive.google.com/file/d/1wFF2lPc9r-rPznDZQLAaUkYkcnbAkXOA/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2695
in INTERNATIONAL POLYMER PROCESSING > Vol. XXII, N° 4 (09/2007) . - p. 324-333[article]Réservation
Réserver ce documentInvestigation on the structure and properties of different PE blown films / S. Fatahi in INTERNATIONAL POLYMER PROCESSING, Vol. XXII, N° 4 (09/2007)
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Titre : Investigation on the structure and properties of different PE blown films Type de document : texte imprimé Auteurs : S. Fatahi, Auteur ; P. G. Lafleur, Auteur ; Abdellah Ajji, Auteur Année de publication : 2007 Article en page(s) : p. 334-345 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Molecular orientation and structure development during film blowing have a major effect on mechanical and physical properties of polyethylene films. In this work the structures and morphology of three different polyethylene blown films; linear low-density polyethylene (LLDPE), low-density polyethylene (LDPE), and high density polyethylene (HDPE) were studied. A series of blown films were produced at different process conditions. The orientation of lamellae and lamellar stacks and the morphology of the films were characterized by SEM, AFM and X-ray diffraction. SEM images of the film plane surface MT (Machine-Transverse) and cross section slices in TN (Transverse-Normal) and MN (Machine-Normal) planes were made and compared with AFM images. It was observed that the surface morphology reflects a continuation of the bulk morphology for the cases studied. Changes in the blown film process parameters, such as take up ratio (TUR), blow up ratio (BUR) and frost line height (FLH) have an effect on structural parameters, crystallinity and mechanical properties. DOI : 10.3139/217.0009 En ligne : https://drive.google.com/file/d/1F3-FJ8mom1ZKHlc_oiVsDwZ_FO0AYJpC/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2696
in INTERNATIONAL POLYMER PROCESSING > Vol. XXII, N° 4 (09/2007) . - p. 334-345[article]Réservation
Réserver ce documentInfluence of mold temperature on the internal structure and creep variation in the thickness direction of sPS injection moldings / K. Banik in INTERNATIONAL POLYMER PROCESSING, Vol. XXII, N° 4 (09/2007)
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Titre : Influence of mold temperature on the internal structure and creep variation in the thickness direction of sPS injection moldings Type de document : texte imprimé Auteurs : K. Banik, Auteur ; G. Menning, Auteur Année de publication : 2007 Article en page(s) : p. 346-351 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : In this work, an effort was made to study the effect of mold temperature variation on the creep behavior of syndiotatctic polystyrene (sPS) injection moldings. The resulting molecular orientation, crystallinity and molecular packing density in the moldings due to processing were characterized to understand the creep variation in the thickness direction. The moldings were sliced off in definite layers by milling from both the surfaces and the creep behavior was characterized. The results indicated that the development of internal structures and the resulting creep behavior is strongly interdependent with creep strain decreasing as the core of the molding is reached. A higher mold temperature generally freezes-in more crystalline regions and enhances the molecular packing density inside the part that affects the tendency to creep. The frozen-in molecular orientation on the other hand showed only a negligible effect. DOI : 10.3139/217.0981 En ligne : https://drive.google.com/file/d/1MdY-kqaQJ2jKnJdARDRq33Nq9qhQmGzn/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2697
in INTERNATIONAL POLYMER PROCESSING > Vol. XXII, N° 4 (09/2007) . - p. 346-351[article]Réservation
Réserver ce documentPreparation of foam from PVC plastisol / N. Nakajima in INTERNATIONAL POLYMER PROCESSING, Vol. XXII, N° 4 (09/2007)
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Titre : Preparation of foam from PVC plastisol Type de document : texte imprimé Auteurs : N. Nakajima, Auteur Année de publication : 2007 Article en page(s) : p. 352-358 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chlorure de polyvinyle
Mousses plastiquesIndex. décimale : 668.9 Polymères Résumé : The results of physical measurements and microscopic observation are presented to elucidate material behaviour at each stage of the foam preparation from PVC plastisol for use as a part of the cushion flooring. The paper also describes how the problems were solved by overcoming contradicting requirements in the process. DOI : 10.3139/217.1010 En ligne : https://drive.google.com/file/d/1xWFuLR2rebQGvEvcOAPTugJnSOoF0ibK/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2698
in INTERNATIONAL POLYMER PROCESSING > Vol. XXII, N° 4 (09/2007) . - p. 352-358[article]Réservation
Réserver ce documentEffects of zinc salts of sulfonated natural rubber on mechanical properties, morphology and compatibility of natural rubber/chlorosulfonated polyethylene blends / Natinee Lopattananon in INTERNATIONAL POLYMER PROCESSING, Vol. XXII, N° 4 (09/2007)
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Titre : Effects of zinc salts of sulfonated natural rubber on mechanical properties, morphology and compatibility of natural rubber/chlorosulfonated polyethylene blends Type de document : texte imprimé Auteurs : Natinee Lopattananon, Auteur ; M. Seadan, Auteur ; K. Boonsong, Auteur Année de publication : 2007 Article en page(s) : p. 359-367 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Rubbery ionomer based on zinc salt of sulfonated natural rubber (Zn-SNR) was employed as a new compatibilizer to prepare blends of natural rubber (NR) and chlorosulfonated polyethylene (CSM) with different compositions by melt mixing process. Epoxidized natural rubber (ENR), known as an effective compatibilizer for such blends, was also incorporated into the blends. The role of ionomer and ENR on NR/CSM blend properties and morphology was evaluated by mean of tensile measurement, oil resistance testing, DMTA and SEM. The tensile properties and oil resistance of the blends were found to increase with respect to CSM content, and increased further on compatibilization with Zn-SNR and ENR. The blends compatibilized with Zn-SNR showed a similar or higher level of improvement in tensile strength and elongation at break as compared to those of ENR. The tensile strength for all of the compatibilized blends was greater than that of corresponding neat blends by 23 to 113 %. The mechanism for enhancing in tensile properties of the blends using the Zn-SNR compatibilizing agent has been proposed. The observation of DMTA and SEM showed that the blends were two-separated phase morphology. However, the addition of Zn-SNR to NR/CSM blends resulted in promoted compatibility as indicated by a shift in the tan d peak of CSM to lower temperature, a reduction in dispersed phase size and better adhesion between NR and CSM. These results demonstrated that the Zn-SNR is a new reactive compatibilizer for NR and CSM blends. DOI : 10.3139/217.2011 En ligne : https://drive.google.com/file/d/1vgejgzPAukGW74B8cyA7tZDzsLNwd6Tl/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2699
in INTERNATIONAL POLYMER PROCESSING > Vol. XXII, N° 4 (09/2007) . - p. 359-367[article]Réservation
Réserver ce documentPolypropylene-clay nanocomposites fibers structure and performance / Abdellah Ajji in INTERNATIONAL POLYMER PROCESSING, Vol. XXII, N° 4 (09/2007)
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Titre : Polypropylene-clay nanocomposites fibers structure and performance Type de document : texte imprimé Auteurs : Abdellah Ajji, Auteur ; J. Denault, Auteur ; D. Côté, Auteur ; M. Bureau, Auteur ; D. Trudel-Boucher, Auteur Année de publication : 2007 Article en page(s) : p. 368-374 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Fibers from Polypropylene (PP) and polypropylene nanocomposite (PNC) were produced using a fiber spinning process. Various amounts of different clays were added to the PP matrix. The structure of PP and PNC fibers was evaluated using field emission scanning electron microscopy (FE-SEM) and Xray diffraction. The crystalline axes orientation factors were determined from wide-angle X-ray diffraction pole figures of (110) and (040) reflections for PP and of (001) for clay. The d-spacing of the (001) clay crystalline plane, indicative of the clay dispersion, was determined from the intensity – 2-thêta plots superimposed on the two dimensional X-ray diagrams. The results obtained for the d-spacing at small angles indicated that the clay in the PNC maintained its intercalated distance at low loadings whereas at higher loadings, some aggregation was observed. Results on orientation of the clay (001) axis (normal to the clay platelets plane) indicated that it was oriented perpendicular to the machine direction, which is expected. Its orientation in the normal and transverse directions was different, suggesting that clay platelets were not randomly distributed in the transverse plane, which was confirmed from SEM observations. The orientation of PP c-axis in the fibers was slightly higher for the nano-composite that the pure resin. Tensile modulus, strength and elongation at break for both PP and PNC fibers increased with increasing draw ratio. Flexural modulus and strength of laminates made by consolidation of the PNC fibers were higher than those of consolidated pure PP fibers as well as those of bulk PP or PNC. DOI : 10.3139/217.2017 En ligne : https://drive.google.com/file/d/1LTV3idYRRrKO1QVAD6TZYDU9bJC6enDC/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2700
in INTERNATIONAL POLYMER PROCESSING > Vol. XXII, N° 4 (09/2007) . - p. 368-374[article]Réservation
Réserver ce documentConstant temperature microfeature embossing with slowly crystallizing polymers / D. Yao in INTERNATIONAL POLYMER PROCESSING, Vol. XXII, N° 4 (09/2007)
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Titre : Constant temperature microfeature embossing with slowly crystallizing polymers Type de document : texte imprimé Auteurs : D. Yao, Auteur ; K. R. T. Ramasubramani, Auteur ; P. Nagarajan, Auteur Année de publication : 2007 Article en page(s) : p. 375-379 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : A new microfeature embossing method utilizing a slowly crystallizing mechanism was investigated to eliminate thermal cycling, as needed in standard hot embossing. Poly(ethylene terephthalate) was used as a model system for demonstration. Due to its slow crystallization, amorphous PET film can be made by melt casting onto a chilled roll. The resulting amorphous film was embossed at a constant temperature of 180°C for a period of time comparable to or longer than the polymer’s half-time of crystallization. During constant-temperature embossing, the film is softened first, caused by rubber softening of the amorphous phase, and is then hardened, resulting from the crystallization of the amorphous phase at the same embossing temperature. Since the embossed film is hardened under the constant mold temperature, no cooling is needed. Selected micro features, including circular microchannels and high aspect ratio microribs, were consistently patterned using a total cycle time about 40s. The embossed films were characterized using DSC and rotational rheometry to elucidate the physical mechanism for softening and hardening the polymer during constant-temperature embossing. DOI : 10.3139/217.2047 En ligne : https://drive.google.com/file/d/1lZUYqJQ8yDYOII-dteV_tO2Y5vNaIiYb/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2701
in INTERNATIONAL POLYMER PROCESSING > Vol. XXII, N° 4 (09/2007) . - p. 375-379[article]Réservation
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