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LLDPE/proton exchanged layered niobate K4Nb6O17 nanocomposites / H. Otaguro in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 4 (08/2012)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVII, N° 4 (08/2012) . - p. 406-413 Titre : LLDPE/proton exchanged layered niobate K4Nb6O17 nanocomposites Type de document : texte imprimé Auteurs : H. Otaguro, Auteur ; Adhemar C. Ruvolo-Filho, Auteur Année de publication : 2012 Article en page(s) : p. 406-413 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Charges (matériaux) Diffractométrie de rayons X Extrudeuse bi-vis Matériaux hybrides Microscopie électronique à balayage Nanoparticules Oxydes lamellaires Polyéthylène basse densité linéaire Potassium niobate -- Synthèse Thermogravimétrie Index. décimale : 668.4 Plastiques, vinyles Résumé : The potassium hexaniobate was synthesized by reacting, in stoichiometric proportions, Nb2O5and K2CO3at 1100 °C and modified with octadecylamine from an acid-base reaction. Through X-ray diffraction, an interlayer space of 4.27 nm was observed in comparison with 0.79 nm of unmodified oxide; this was also shown by SEM microscopy. The hybrid nanofiller previously obtained was incorporated into LLDPE by melt intercalation (0 up to 10 wt.%) using a twin screw extruder and LLDPE-g-MAH as compatibilizer. From TGA results, all nanocomposites (LLDPE/LLDPE-g-MAH/lamellar oxide) have increased the onset degradation temperature, while the oxide lost during processing for LLDPE/LLDPE-g-MAH/lamellar oxide nanocomposites was higher for the highest content in comparison with LLDPE matrix. According to the Eyring equation, the activation volume of the samples could be calculated using the relationship between the yield strength and strain rate from tensile stress-strain curves. The activation volume decreased with increase of nanofiller concentration, suggesting a good adhesion between the layered oxide and the polymeric matrix for high concentration. This can be attributed to the restricted segmental motion near the nanofiller/polymeric interface, while a poor interaction between them was observed for low concentration. However, the Young’s modulus showed a 50% improvement for low nanofiller concentration, especially in the case of 1 wt.% of nanofiller, which was also confirmed by modulus and toughness balance. Considering all the results, it has been revealed that the proton exchanged layered niobate can improve the thermal and mechanical properties of LLDPE/LLDPE-g-MAH/lamellar oxide nanocomposites. DOI : 10.3139/217.2384 En ligne : https://drive.google.com/file/d/1dJ8StmaAO34Z82B_aOwgI1c7UFU9VUA5/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15702 [article]

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Experimental flow visualization and residence time distributions in a co-kneader / M. Brito-Bazan in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 4 (08/2012)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVII, N° 4 (08/2012) . - p. 414-426 Titre : Experimental flow visualization and residence time distributions in a co-kneader Type de document : texte imprimé Auteurs : M. Brito-Bazan, Auteur ; L. Fradette, Auteur ; P. A. Tanguy, Auteur Année de publication : 2012 Article en page(s) : p. 414-426 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Distribution de temps de séjour Ecoulement visqueux Fluides, Mécanique des Malaxeurs et mélangeurs Mesures optiques Polymères Polyméthacrylate de méthyle Le poly(méthacrylate de méthyle) (souvent abrégé en PMMA, de l'anglais Poly(methyl methacrylate)) est un polymère thermoplastique transparent obtenu par polyaddition dont le monomère est le méthacrylate de méthyle (MMA). Ce polymère est plus connu sous son premier nom commercial de Plexiglas (nom déposé), même si le leader global du PMMA est Altuglas International9 du groupe Arkema, sous le nom commercial Altuglas. Il est également vendu sous les noms commerciaux Lucite, Crystalite, Perspex ou Nudec. Rhéologie Index. décimale : 668.9 Polymères Résumé : Flow patterns and residence time distributions have been investigated in a transparent laboratory-scale Co-Kneader with a viscous fluid and different combinations of operating conditions. An image analysis technique, already successfully applied in stirred tanks, has been applied here for the first time in a continuous system. The flow visualization results are presented as mixing curves, which show quantitatively the evolution of the macromixing along the Co-Kneader. It has been found that the image analysis technique gives new insight into the mixing mechanism of the Co-Kneader and may be used as a simple experimental method to quantify the degree of backmixing. Residence time distributions have been used to obtain axial dispersion coefficients. A comparison of the cumulative distribution functions between different systems is also presented. DOI : 10.3139/217.2470 En ligne : https://drive.google.com/file/d/1QDd_qJo-AG4_adm605j8fU35pRbPAhd8/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15755 [article]

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Mechanochemical milling of PP/ground tire rubber blends in solid-state / X. Zhang in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 4 (08/2012)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVII, N° 4 (08/2012) . - p. 42-433 Titre : Mechanochemical milling of PP/ground tire rubber blends in solid-state : A cost-effective strategy for the recycling of tires Type de document : texte imprimé Auteurs : X. Zhang, Auteur ; Z. Zhou, Auteur ; X. He, Auteur ; J. Li, Auteur ; C. Lu, Auteur Année de publication : 2012 Article en page(s) : p. 42-433 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alliages polymères Allongement à la rupture Caoutchouc Fragmentation Pneus -- Recyclage Polypropylène Traction (mécanique) Index. décimale : 678.2 Caoutchouc Résumé : In this study, solid-state mechanochemical milling was investigated as a viable strategy to produce high performance blends composed of polypropylene (PP) and ground tire rubber (GTR), thereby providing a potentially new route to recycle discarded tires. The improved dispersion of the blends after mechanochemical milling was confirmed by fluorescence microscopy and polarized optical microscopy (POM) observation. After 20 cycles of milling, the tensile strength of PP/GTR (100/40) blends was enhanced by 13.8%, and the elongation at break was over 12 times than that of the unpretreated blend. The formation of smaller and less ordered spherulites of PP after mechanochemical milling as confirmed by POM observation and wide-angle X-ray diffraction analysis might be the reason for the significant enhancement of the elongation at break. DOI : 10.3139/217.2545 En ligne : https://drive.google.com/file/d/1QwxN47pteu6-lW83wHtmCmcBDcdTje6R/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15756 [article]

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Development of polymer extrusion extruder for evaluating with a small amount of polymeric material / Hideyuki Uematsu in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 4 (08/2012)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVII, N° 4 (08/2012) . - p. 434-440 Titre : Development of polymer extrusion extruder for evaluating with a small amount of polymeric material : Evaluation of shear viscosity and processability of film Type de document : texte imprimé Auteurs : Hideyuki Uematsu, Auteur ; Shuichi Tanoue, Auteur ; Y. Iemoto, Auteur ; M. Sugimoto, Auteur ; T. Taniguchi, Auteur ; K. Koyama, Auteur Année de publication : 2012 Article en page(s) : p. 434-440 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cisaillement (mécanique) Couches minces Couches minces multicouches Extrudeuses Matières plastiques -- Extrusion:Polymères -- Extrusion Polymères Rhéologie Viscosimétrie Index. décimale : 668.9 Polymères Résumé : We developed the extrusion system to evaluate the extrusion behavior such as the shear viscosity, which is one of basic properties, and the processability of mono/multilayer film with a small amount of polymeric material. In order to measure the shear viscosity, the gear pump, the return path and the pressure sensors were introduced into the extruder with intermeshing co-rotating twin screws. The viscosity could be evaluated on-line from the volumetric flow rate of molten polymer and the pressure drop in the return path before film processing. The capacity of gear pump, the shape and size of return path were optimized to evaluate the viscosity of polymeric material, which generally undergoes shear rate of 10 ~ 1 000 s–1in the film processing. The apparatus for mono and multilayer film processing consisted of two extruders including the multichannel feedblock and T-die with the manifold and land section. The compact feedblock was designed to receive two feedstreams, so that the product can have two layers. We investigated the on-line viscosity measurement methodology and the processability, which is the neck-in phenomenon for monolayer film and the interface stability for multilayer film, using typical polymer material of 30 grams at once. The viscosity evaluated with our system corresponded with the result of commercial rheometer. It was also confirmed that the processability of mono and multilayer film could be evaluated quantitatively with our system. DOI : 10.3139/217.2559 En ligne : https://drive.google.com/file/d/16yNx6ds331BcqZ4SKnk_Ycqx6lFcLtin/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15766 [article]

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A 3D simulation analysis of reactive flow in screw elements of closely intermeshing twin screw extruders / Ederley Ortiz-Rodriguez in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 4 (08/2012)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVII, N° 4 (08/2012) . - p. 442-451 Titre : A 3D simulation analysis of reactive flow in screw elements of closely intermeshing twin screw extruders : Scale-up calculations Type de document : texte imprimé Auteurs : Ederley Ortiz-Rodriguez, Auteur ; C. Tzoganakis, Auteur Année de publication : 2012 Article en page(s) : p. 442-451 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Ecoulement permanent Extrudeuse bi-vis Modélisation tridimensionnelle Peroxydes Polypropylène Rhéologie Simulation par ordinateur Index. décimale : 668.9 Polymères Résumé : The peroxide-initiated degradation of polypropylene in conventional screw elements of closely intermeshing twin-screw extruders is analyzed by means of a three-dimensional (3D) simulation approach. The 3D simulations of the reacting flow are implemented under the assumption of steady-state flow conditions, and scale-up considerations are addressed by simulating screw elements of two different size extruders. The effects of the initial peroxide concentration and reference mass throughputs on processing parameters are analyzed in terms of the specified extruder size. In this study, the scaled-up mass throughput is determined under the assumption of constant residence time. For the implemented processing conditions, the final values of the weigh-average molecular weight (Mw) and polidispersity index (PDI) for both the reference and scaled-up screw elements are similar when the flow rate is close to that corresponding to the maximum conveying capacity of the screw elements. For more restricted flow conditions, however, lower values of both the Mw and PDI are obtained for the larger screw element. Additionally, a previously proposed scale-up procedure from one-dimensional (1D) simulations is evaluated by means of a 3D simulation analysis. The results of this evaluation show a good agreement between the trend of the 3D and 1D simulation results. Note de contenu : - Modeling considerations - Set up of the simulations and processing conditions - Discussion and results : Genral scale-up calculation analysis - Thermal time analysis DOI : 10.3139/217.2568 En ligne : https://drive.google.com/file/d/1X1cNmVTFhJmSjh-difgAne0WIojvpuB0/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15767 [article]

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Morphology and mechanical properties of compatibilized bio-sourced PA/plasticized starch grafted PP ternary polymer blends / F. Teyssandier in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 4 (08/2012)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVII, N° 4 (08/2012) . - p. 452-460 Titre : Morphology and mechanical properties of compatibilized bio-sourced PA/plasticized starch grafted PP ternary polymer blends Type de document : texte imprimé Auteurs : F. Teyssandier, Auteur ; Philippe Cassagnau, Auteur ; J. F. Gérard, Auteur ; N. Mignard, Auteur Année de publication : 2012 Article en page(s) : p. 452-460 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alliages polymères Alliages polymères -- propriétés mécaniques Bioplastiques Biopolymères Copolymères greffés Epoxydes Extrudeuse bi-vis Matières plastiques -- Extrusion:Polymères -- Extrusion Morphologie (matériaux) 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. Polypropylène Index. décimale : 668.9 Polymères Résumé : Polymer blends of biosourced polyamide (Rilsan XD) and thermoplastic starch grafted polypropylene (LAB4270) were processed by means of a co-rotating twin-screw extruder, using a solid epoxy resin (D.E.R. 664UE) as a compatibilizer. Morphologies as well as rheological, thermal and mechanical properties of the blends were characterized. The morphology of the reference blend was characterized by nodules of the micron order of magnitude of the dispersed phase (LAB4270) embedded in the polyamide matrix. Even though the morphologies of the blends were not impacted by the addition of the epoxy resin, the mechanical properties as well as the impact resilience were proved to be enhanced. The thermal properties of the blends were as well influenced. A shift of the crystallization temperatures and a decrease of the crystallization enthalpies of both the polypropylene and the PA XD were observed. Thus the addition of the epoxy resin as compatibilizer had proved to be truly effective to obtain a material mostly biosourced with mechanical properties that tend towards combined optimal properties of the different components of the blend. DOI : 10.3139/217.2576 En ligne : https://drive.google.com/file/d/13wFyUPS9SNpF7UzbhHAgK5145IGu-rR9/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15768 [article]

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Preparation and characterization of polyurethane/polysulfide miscible blend nanocomposites / P. K. Guchhait in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 4 (08/2012)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVII, N° 4 (08/2012) . - p. 461-468 Titre : Preparation and characterization of polyurethane/polysulfide miscible blend nanocomposites : Effect of nanoclay reinforcement on morphology, mechanical and thermal properties Type de document : texte imprimé Auteurs : P. K. Guchhait, Auteur ; M. Rahaman, Auteur ; L. Nayak, Auteur ; T. K. Chaki, Auteur Année de publication : 2012 Article en page(s) : p. 461-468 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alliages polymères -- propriétés mécaniques Analyse thermique Argile Caractérisation Charges (matériaux) Dispersions et suspensions Elastomères Fourier, Spectroscopie infrarouge à transformée de Isocyanates Matériaux hybrides Microscopie électronique en transmission Nanoparticules Polysulfures Polyuréthanes Thermogravimétrie Thiophène Le thiophène est un composé organique hétérocyclique aromatique de la classe des métalloles. C'est un liquide limpide incolore ayant une odeur qui rappelle celle du benzène. Le thiophène est souvent trouvé naturellement dans le pétrole à des concentrations de quelques pourcents. Le thiophène est un des composés utilisés pour dénaturer l'alcool. La réaction de polymérisation du thiophène conduit au polythiophène. La chimie du thiophène est essentiellement marquée par son caractère aromatique (4 électrons apportés par les doubles liaisons, deux par le soufre). Index. décimale : 668.9 Polymères Résumé : Novel elastomeric miscible blend nanocomposites have been prepared by co-reacting isocyanate terminated liquid polyurethane pre-polymer with thiol terminated polysulfide together with chain extender, modified organic nanoclay, and curator. The studies report the influence of nanoclay loading on the morphology, mechanical and thermal properties of the nanocomposites. The morphology and state of dispersion of nanoclays in the nanocomposites were studied by high resolution transmission electron microscopy (HRTEM). It was seen that nanoclay particles were well dispersed in the blend at 1, 3, and 5 wt.% nanoclay loadings. The reactive miscibility of blend was confirmed by differential scanning calorimetry (DSC) and fourier transform infrared spectroscopy (FTIR). The effect of clay loading on thermal stability of polysulfide PS/IPU blend and their nanocomposites was studied by thermogravimetric analysis (TGA). It was observed that thermal stability of nanocomposite progressively increased with increase in nanoclay loading. However, about 123% increment in adhesive strength, 78% increment in tensile strength were observed at 3 wt.% clay loaded nanocomposite when compared to control blend. This enhancement in thermal, adhesion and mechanical properties demonstrate that the resulting nanocomposites can be tailored as novel adhesive and coating materials for aerospace application. DOI : 10.3139/217.2581 En ligne : https://drive.google.com/file/d/1D-X0pi8ds_n-GUOOmgZ4tSoQkRRe93CJ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15769 [article]

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Modelling the solids throughput of single screw smooth barrel extruders as a function of the feed section parameters / J.-S. Leßmann in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 4 (08/2012)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVII, N° 4 (08/2012) . - p. 469-477 Titre : Modelling the solids throughput of single screw smooth barrel extruders as a function of the feed section parameters Type de document : texte imprimé Auteurs : J.-S. Leßmann, Auteur ; Robert Weddige, Auteur ; Volker Schöppner, Auteur ; Alexander Porsch, Auteur Année de publication : 2012 Article en page(s) : p. 469-477 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Eléments discrets, Méthode des Extrudeuse monovis Milieux granulaires Modélisation tridimensionnelle Simulation par ordinateur Solides Index. décimale : 668.9 Polymères Résumé : In a smooth barrel extruder, the throughput is generally dominated by the metering sections pumping ability. Within the feed zone, more granules can always be conveyed than can melt in the compression zone and be discharged in the metering zone. At high screw speeds, this effect will only occur if the granules flow quickly enough out of the hopper into the screw channel and this is fully filled. In this case, the solids throughput up to maximum screw speed shows an approximately linear relationship to the speed. These linear solids conveying characteristics necessitate constructional changes to the hopper opening. In this article, solids conveying processes with approximately linear conveying characteristics up to speeds of 2,000 min– 1 (peripheral velocities up to 3 m/s) are simulated with various feed hopper geometries. The simulations are carried out by means of DEM (Discrete Element Method) in which the granules are approximated by single spherical particles. From the simulation results, via dimensional analysis a model is derived for describing the throughput as a function of the geometry and process parameters of the solids feed zone. DOI : 10.3139/217.2588 En ligne : https://drive.google.com/file/d/1KoJZQv3IYedgbMiaVKz9pJ7bqiV7zl_u/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15770 [article]

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Experimental investigation and theoretical prediction of extrudate swell using conformational rheological models / M. K. Yazdi in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 4 (08/2012)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVII, N° 4 (08/2012) . - p. 478-485 Titre : Experimental investigation and theoretical prediction of extrudate swell using conformational rheological models Type de document : texte imprimé Auteurs : M. K. Yazdi, Auteur ; A. Ramazani, Auteur ; H. H. Amoli, Auteur ; A. Kamyabi, Auteur Année de publication : 2012 Article en page(s) : p. 478-485 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Carboxyméthylcellulose Giesekus, Modèle de Matières plastiques -- Extrusion:Polymères -- Extrusion Microstructures Polymères Polymères -- Structure Rhéologie Solutions aqueuses (chimie) Index. décimale : 668.9 Polymères Résumé : In this study the extrudate swell of polymer solutions is estimated using the microstructure of polymer molecules. When a flexible polymer chain goes through a narrow die shear stress exerting on the chain will cause the polymer chain to be stretched along the flow direction. After emerging from die all external stresses vanish immediately and the chains tend to recover their previous state due to elastic recovery. This phenomenon will results in a gradual increase in extrudate diameter and this is used as the key idea for estimating swell ratio. A Giesekus based conformational model was used in order to predict polymer chains microstructure everywhere in the domain. The resulting PDE set including, continuity, momentum, and conformational rheological model were solved using a finite volume method with the OpenFOAM software. Numerical results were compared with experimental data which were obtained for aqueous solutions of Carboxymethylcellulose. It was found that model predictions are in good agreement with experimental data. The results were also compared to results which were obtained by the Tanner relation which underestimates experimental data. Note de contenu : - Conformational models - Governing equations - Geometry and mesh - Estimation of swell DOI : 10.3139/217.2590 En ligne : https://drive.google.com/file/d/1mEL_Dr036aIPLyyMN92q2uZ5uCc77kOL/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15771 [article]

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Controllable self-organization of polyphenylene oxide honeycomb microstructure / H. Chen in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 4 (08/2012)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVII, N° 4 (08/2012) . - p. 486-492 Titre : Controllable self-organization of polyphenylene oxide honeycomb microstructure Type de document : texte imprimé Auteurs : H. Chen, Auteur ; X. Shang, Auteur ; D. Zhang, Auteur ; I. Hagiwara, Auteur Année de publication : 2012 Article en page(s) : p. 486-492 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Films plastiques Hydrophobie Microstructures Oxyde de polyphénylène Plastiques alvéolaires Structure en nid d'abeilles Systèmes auto-organisés Index. décimale : 668.9 Polymères Résumé : Polymer films with patterned microstructure have been widely applied in various industrial areas such as micro reactors, chemical sensors and micro-molded template etc. In this paper, a self-supporting polymer film with regular honeycomb microstructure is fabricated by self-organization via evaporation of polyphenylene oxide (PPO) solution in which carbon disulfide is used as solvent under humid ambience. Apart from investigation of self-organization mechanism of PPO honeycomb including nucleation, growth of water droplets condensed upon liquid supporting substrate, the quantitative relationship between honeycomb microstructure and ambient conditions is built through tremendous self-organization experiments. The controllable formation of honeycomb microstructure with desirable hydrophobicity was achieved by use of built quantitative relationship. Moreover, hydrophobicity mathematical model of self-organized honeycomb thin film was proposed, and its validation was experimentally verified. Note de contenu : - PPO SELF-ASSEMBLY EXPERIMENT - RESULTS AND DISCUSSION : Stability of the self-organized film - Influence of ambient humidity on self-organized film - Influence of solution concentration on the self-organized film - Controllability of honeycomb microstructure formation DOI : 10.3139/217.2606 En ligne : https://drive.google.com/file/d/1pHrueSKIlee_MtkTq9VWdrzJ_1bpmlmE/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15772 [article]

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An investigation on usage of sodium borohydride and zinc oxide as oxygen scavengers in polyethylene terephthalate films / Ilhan Özen in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 4 (08/2012)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVII, N° 4 (08/2012) . - p. 493-497 Titre : An investigation on usage of sodium borohydride and zinc oxide as oxygen scavengers in polyethylene terephthalate films Type de document : texte imprimé Auteurs : Ilhan Özen, Auteur Année de publication : 2012 Article en page(s) : p. 493-497 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Borohydrure de sodium Le tétrahydruroborate de sodium, aussi appelé borohydrure de sodium, est un composé chimique constitué d'atomes de bore, de sodium et d'hydrogène. Sa formule brute est NaBH4. C'est un agent réducteur utilisé notamment dans l'industrie pharmaceutique en tant que source d'hydrures H-. C'est un solide blanc, souvent rencontré sous forme de poudre. Le borohydrure de sodium absorbe l'humidité de l'air (il est hygroscopique). Il réagit avec l'eau et dégage lentement du dihydrogène, un gaz inflammable/explosif. Selon la classification européenne des produits chimiques, il est enregistré avec la phrase de risque R14 "réagit violemment au contact de l'eau". Le produit se décompose à plus de 400 °C sans fondre. Sa décomposition est violente et exothermique avec l'eau. Capteurs (technologie) Films plastiques Matériaux -- Propriétés barrières Matières plastiques -- Extrusion:Polymères -- Extrusion Oxyde de zinc Oxygène Polyéthylène téréphtalate Index. décimale : 668.9 Polymères Résumé : The aim of this work is the production and characterisation of a plastic film having active oxygen barrier properties. The films have been obtained by adding an oxygen scavenger (either sodium borohydride (NaBH4) or zinc oxide (ZnO)) into a polyethylene terephthalate (PET) matrix during the extrusion process. In order to investigate the activity of the scavengers used, the produced films have been subjected to permeability measurements. It was revealed that NaBH4 – though a strong reductive agent – didn’t cause any degradation in matrix polymer but served as an ineffective oxygen scavenger as in the case of ZnO. DOI : 10.3139/217.2613 En ligne : https://drive.google.com/file/d/1MENbIXiAdGFiyS-MPffEdVC0bzu3w09T/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15773 [article]

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14087	-	Périodique	Bibliothèque principale	Documentaires	Disponible