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Melt processing of wood cellulose tissue and ethylene-acrylic copolymer composites / Ruth Ariño in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 4 (08/2013)
[article]
Titre : Melt processing of wood cellulose tissue and ethylene-acrylic copolymer composites Type de document : texte imprimé Auteurs : Ruth Ariño, Auteur ; A. Boldizar, Auteur Année de publication : 2013 Article en page(s) : p. 429-436 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bois
CelluloseLa cellulose est un glucide constitué d'une chaîne linéaire de molécules de D-Glucose (entre 200 et 14 000) et principal constituant des végétaux et en particulier de la paroi de leurs cellules.
Composites à fibres végétales -- Propriétés mécaniques
Copolymère éthylène acide acrylique
Extrudeuse bi-vis
Extrudeuses
Mélange
Textiles et tissus
Vis barrièreIndex. décimale : 668.4 Plastiques, vinyles Résumé : The difficulty of feeding cellulose fibers together with the polymer into the melt processing equipment is a serious disadvantage for the production of cellulose-containing composites on a large scale. In the present work, a continuous method of feeding cellulose in the form of a tissue into a twin-screw extruder through an opening downstream of the extruder cylinder was studied. With this method, composites with different fiber contents were obtained. The tissues used were one made mainly of softwood fibers and another mainly of hardwood fibers. In order to better understand how to improve the fiber dispersion by melt mixing, a second extrusion was performed with a single screw extruder with a barrier-flighted screw and also with the twin-screw used to compound the tissue with the polymer. The compounds produced were then injection molded into test bars. The test bars containing the softwood tissue exhibited some fiber aggregates also after a second extrusion, whereas no fiber aggregates were observed in samples made with the tissue containing hardwood fibers and two passes through the twin screw. The fiber length was in general reduced by each melt processing stage and the shortest fiber length was observed after two extrusions with the twin-screw and injection molding. The tensile modulus increased with increasing fiber content. A higher stiffness was obtained with more softwood fibers in the tissue whereas more hardwood fibers gave a higher tensile strength and greater elongation at break. Note de contenu : - EXPERIMENTAL : Materials - Melt processing - Measurements
- RESULTS AND DISCUSSION : Fiber content - Visual characterization - Microscope analysis - Fiber length - Tensile propertiesDOI : 10.3139/217.2773 En ligne : https://drive.google.com/file/d/1aA9xrzdk3bKtvqEBDoxAnBQfQR8_xdi7/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19288
in INTERNATIONAL POLYMER PROCESSING > Vol. XXVIII, N° 4 (08/2013) . - p. 429-436[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 15396 - Périodique Bibliothèque principale Documentaires Disponible Melt spinning of thermoplastic polyurethane - solvent-free alternative conventional solution spinning process / Pavan Kumar Manvi in CHEMICAL FIBERS INTERNATIONAL, Vol. 69, N° 4 (12/2019)
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Titre : Melt spinning of thermoplastic polyurethane - solvent-free alternative conventional solution spinning process Type de document : texte imprimé Auteurs : Pavan Kumar Manvi, Auteur ; Thomas Gries, Auteur Année de publication : 2019 Article en page(s) : p. 223-225 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Copolymères
Etat fondu (matériaux)
Extrudeuse bi-vis
Extrusion filage
Filature -- Appareils et matériels
Fils multifilaments
Morphologie (matériaux)
Polyuréthanes
Structure chimique
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 : 677.4 Textiles artificiels Résumé : Polyurethanes are a class of elastic copolymers, which are known for their highelongation and very good elastic properties. Polyurethanes as polymer are available in variable hardness grades, which make them suitable for a long range of applications i.e. packaging, sealing, coating, textile applications etc. Elongation and elasticity are regarded as important properties of textiles as these properties play an important role in the wear comfort and shape retention of the textiles. According to a study, 80% of clothing contains elastic filaments in variable proportion. This makes the use of elastic filaments unavoidable in the apparel industry. This article gives an overview of polyurethane properties, filament production processes and recent advancements in the melt spinning process. Note de contenu : - Filament spinning of polyurethanes
- Fig. 1 : Schematic presentation of copolymers
- Fig. 2 : Chemical structure of urethane bond
- Fig. 3 : Schematic presentation of the 2-phase morphology of polyurethane
- Fig. 4 : Schematic presentation of Xplore twin screw extruder
- Fig. 5 : Melt spun TPU filaments at lab scale
- Fig. 6 : Technical scale melt spinning machine
- Fig. 7 : Stable extrusion process at technical scale
- Fig. 8 : Multifilaments spun at technical scale melt spinning machineEn ligne : https://drive.google.com/file/d/10mEJTmsM1BE0HOxBVodwIKAavZYwWd4K/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33592
in CHEMICAL FIBERS INTERNATIONAL > Vol. 69, N° 4 (12/2019) . - p. 223-225[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21388 - Périodique Bibliothèque principale Documentaires Disponible Melt spinning of thermoplastic polyurethane solvent-free alternative to conventional solution spinning process / Pavan Kumar Manvi in CHEMICAL FIBERS INTERNATIONAL, Vol. 70, N° 4 (12/2020)
[article]
Titre : Melt spinning of thermoplastic polyurethane solvent-free alternative to conventional solution spinning process Type de document : texte imprimé Auteurs : Pavan Kumar Manvi, Auteur ; Thomas Gries, Auteur Année de publication : 2020 Article en page(s) : p. 176-1178 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Copolymères
Etudes comparatives
Extrudeuse bi-vis
Extrusion filage
FilamentsFibre de longueur infinie ou extrême comme celle qu'on trouve dans la soie à l'état naturel. Les fibres manufacturées sont extrudées en filaments qui sont transformés en fils continus, en fibres courtes ou en câbles.
Filature à sec
Fils multifilaments
Liaisons chimiques
Polyuréthanes
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.
UrethanesIndex. décimale : 677.4 Textiles artificiels Résumé : Polyurethanes are a class of elastic copolymers, which are known for their high elongation and very good elastic properties. Polyurethanes as polymer are available in variable hardness grades, which make them suitable for a long range of applications i.e. packaging, sealing, coating, textile applications etc. Elongation and elasticity are regarded as important properties of textiles as these properties play an important role in the wear comfort and shape retention of the textiles. According to a study, 80% of clothing contains elastic filaments in variable proportion. This makes the use of elastic filaments unavoidable in the apparel industry. This article gives an overview of polyurethane properties, filament production processes and recent advancements in the melt spinning process. Note de contenu : - Filament spinning of polyurethanes
- Fig. 1 : Schematic presentation of copolymers
- Fig. 2 : Chemical structure of urethane bond
- Fig. 3 : Schematic presentation of the 2-phase morphology of polyurethane
- Fig. 4 : Schematic presentation of Xplore twin screw extruder
- Fig. 5 : Melt spun TPU filaments at lab scale
- Fig. 6 : Technical scale melt spinning machine
- Fig. 7 : Stable extrusion process at technical scale
- Fig. 8 : Multifilaments spun at technical scale melt spinning machine
- Table : Comparison between melt spinning and solution dry spinning processEn ligne : https://drive.google.com/file/d/1eM2V_KI6EZKKKcTe31Q0XclPpiXMBZMK/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35039
in CHEMICAL FIBERS INTERNATIONAL > Vol. 70, N° 4 (12/2020) . - p. 176-1178[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 22511 - Périodique Bibliothèque principale Documentaires Disponible 22474 - Périodique Bibliothèque principale Documentaires Disponible Microcellular PP vs. microcellular PP/MMT nanocomposites : a comparative study of their mechanical behavior / S. J. A. Rizvi in INTERNATIONAL POLYMER PROCESSING, Vol. XXVI, N° 4 (09/2011)
[article]
Titre : Microcellular PP vs. microcellular PP/MMT nanocomposites : a comparative study of their mechanical behavior Type de document : texte imprimé Auteurs : S. J. A. Rizvi, Auteur ; Naresh Bhatnagar, Auteur Année de publication : 2011 Article en page(s) : p. 375-382 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Anhydride maléique
Azote
Copolymères greffés
Extrudeuse bi-vis
Fluides supercritiques
Matières plastiques -- Moulage par injection microcellulaire
Montmorillonite
Mousses plastiques -- Extrusion
Mousses plastiques -- Propriétés mécaniques
Nanoparticules
Nucléation
PolypropylèneIndex. décimale : 668.9 Polymères Résumé : Microcellular foams have attracted interest in both scientific and industrial communities. Injection molding is perhaps the most versatile industrial method of polymer processing. Microcellular injection molding is a newcomer variant in this class. It is capable to produce microcellular structure. The mechanical behavior of a microcellular polymer is different than conventional foams. Although they exhibit much improved mechanical properties than conventional foams still they are inferior to solid polymer. Incorporation of nanoparticles in matrix may affect the nucleation and bubble growth process. Further, nanoparticles will enhance the performance (stiffness, strength etc.) of matrix. In present study an effort has been made to quantitatively analyze the improvements in mechanical properties of microcellular foam with the addition of nanoclay (MMT). Nanocomposite of polypropylene and nanoclay was prepared in a co-rotating twin screw extruder. Maleic anhydride grafted polypropylene (PP-g-MA) was used as compatibilizer. PP/nanocomposites were foamed in a microcellular injection molding machine, where supercritical nitrogen (SCF-N2) was mixed with plasticized PP/ nanocomposite inside the screw – barrel assembly. The molded foamed samples were tested for various mechanical properties. Experimental results show that a considerable improvement occur in the property of microcellular polypropylene by the addition of 2 wt.% nanoclay (MMT). DOI : 10.3139/217.2375 En ligne : https://drive.google.com/file/d/1f6-1RrQ1xrQyO-cb5JWkYXr4szFJ_G6i/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12435
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Code-barres Cote Support Localisation Section Disponibilité 013208 - Périodique Bibliothèque principale Documentaires Disponible Microstructural evolution of PP/EPDM/organoclay nanocomposites in a twin screw extruder / R. Khosrokhavar in INTERNATIONAL POLYMER PROCESSING, Vol. XXVI, N° 2 (05/2011)
[article]
Titre : Microstructural evolution of PP/EPDM/organoclay nanocomposites in a twin screw extruder Type de document : texte imprimé Auteurs : R. Khosrokhavar, Auteur ; Ghasem Naderi, Auteur ; G. R. Bakhshandeh, Auteur ; M. H. R. Ghoreishy, Auteur Année de publication : 2011 Article en page(s) : p. 212-218 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Argile
Cloisite
Diffractométrie de rayons X
Ethylène-propylène-diène monomère
Extrudeuse bi-vis
Matériaux hybrides
Microscopie électronique en transmission
Polypropylène
RhéologieIndex. décimale : 668.9 Polymères Résumé : The offline Microstructure of nanocomposites based on Poly-Propylene (PP), Ethylene-Propylene Diene Monomer (EPDM) and Cloisite 15A along the twin screw extruder barrel was investigated by X-Ray diffraction, Transmission Electron Microscopy (TEM) and rheological measurements. To assess the effect of screw zones, the microstructural development of nanocomposites along the screw was investigated. Accordingly, dead-stop experiment samples were taken at four different positions of the extruder after abruptly stopping the machine and opening the barrel. Effect of clay loading on the evolution of morphology in the extruder was studied. X-Ray diffraction results showed that at lower clay contents (up to~ 7 wt.%), the intercalation process is independent of screw geometry and accomplishes as soon as the matrix is melted; and on the other hand, excessive melt mixing of the samples containing higher clay loadings (10 wt.%) might lead to the collapse of silicate layers and consequently poor degrees of intercalation/exfoliation. Results were confirmed by TEM micrographs and also XRD patterns of the nanocomposites sensitively detecting the microstructural changes of the samples. DOI : 10.3139/217.2445 En ligne : https://drive.google.com/file/d/1hk4uZSKHI-M41ZOWEmk16v1JCxi6lpmR/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11525
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PermalinkSimulation de l’évolution de la longueur de fibres ligno-cellulosiques durant la réalisation de composites en extrusion bivis / Françoise Berzin in RHEOLOGIE, Vol. 25 (06/2014)
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