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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Effect of flow induced orientation of carbon nanotubes on the capillary extrusion behavior of low-density polyethylene / Hideyuki Uematsu in INTERNATIONAL POLYMER PROCESSING, Vol. XXXII, N° 1 (03/2017)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXII, N° 1 (03/2017) . - p. 3-10 Titre : Effect of flow induced orientation of carbon nanotubes on the capillary extrusion behavior of low-density polyethylene Type de document : texte imprimé Auteurs : Hideyuki Uematsu, Auteur ; T. Natsuume, Auteur ; S. Tanoue, Auteur ; Y. Iemoto, Auteur Année de publication : 2017 Article en page(s) : p. 3-10 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Extrusion capillaire Nanotubes Polyéthylène basse densité Rhéologie Index. décimale : 668.4 Plastiques, vinyles Résumé : The effect of carbon nanotubes (CNTs) on the capillary extrusion behavior of low-density polyethylene (PE) was investigated. From the linear viscoelasticity and the morphology observation, it was found that the CNTs were well dispersed throughout the PE matrix and our system belonged to the semi-dilute regime. The strain hardening, which quantifies the extension of the PE chain, decreased by presence of CNTs in the uniaxial elongational deformation. In contrast, the normal stress difference was almost unaffected by CNTs in the shear deformation. The capillary extrusion behavior revealed that swell ratio decreased with increasing the CNT content although melt fracture was promoted. We summarize that the suppression of swell and promotion of melt fracture are attributable to the orientation of CNTs. Note de contenu : - EXPERIMENTAL : Materials - Measurements - RESULTS AND DISCUSSION : Rhelogical response under shear and elongational flow - Capillary extrusion behavior DOI : 10.3139/217.3062 En ligne : https://www.degruyter.com/document/doi/10.3139/217.3062/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27973 [article]

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Effect of processing conditions on the dispersion of vapor grown carbon fiber in a polyamide 6 and the crystalline structure of their composites by melt compounding / T. Koyama in INTERNATIONAL POLYMER PROCESSING, Vol. XXV, N° 3 (07/2010)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXV, N° 3 (07/2010) . - p. 181-187 Titre : Effect of processing conditions on the dispersion of vapor grown carbon fiber in a polyamide 6 and the crystalline structure of their composites by melt compounding Type de document : texte imprimé Auteurs : T. Koyama, Auteur ; Shuichi Tanoue, Auteur ; Y. Iemoto, Auteur Année de publication : 2010 Article en page(s) : p. 181-187 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Composites à fibres de carbone Fibres de carbone Polyamide 6 Tags : 'Polyamide  6'  'Phase  vapeur'  'Fibre  de  carbone'  'Vapor  grown  carbon  fiber'  (VGCF) Index. décimale : 668.9 Polymères Résumé : We present the preparation of polyamide 6 (PA6)/Vapor Grown Carbon Fiber (VGCF) composites by melt compounding. Two commercialized forms of PA6 with different melt flow rates (herein named PA6-low and PA6-high.) and two VGCF, VGCF-H (aspect ratio: 40) and VGCF-S (aspect ratio: 100) were used in this study. Young's modulus and the yield strength increased when small amount of VGCF (e.g. 1 wt.%) was added to PA6, and the properties of PA6-low/VGCF composites increased with a decrease in the aspect ratio of VGCF. According to scanning electron microscopy (SEM) observations, the dispersion state of VGCF in PA6-low/VGCF-S composites is superior to the PA6-low/VGCF-H composites. This may be due to the weakening of tensile properties caused by cracks between the adjoining crystals generated by the large amount of VGCF that act as nucleants. Hence, the aspect ratio of VGCF has an influence on the tensile properties of PA6/VGCF composites. The mechanical properties were shown to increase with VGCF-H length. Matrix viscosity and the screw rotation speed were also found to influence the mechanical properties of PA6/VGCF-H composites. DOI : 10.3139/217.2307 En ligne : https://drive.google.com/file/d/1Hczpte4Dsd4HQ9G5-7yU74TBKnqMLFTD/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9730 [article]

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Effect of screw rotation speed on the properties of polycarbonate/vapor-grown carbon fiber composites prepared by melt compounding / Shuichi Tanoue in INTERNATIONAL POLYMER PROCESSING, Vol. XXIX, N° 1 (03/2014)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXIX, N° 1 (03/2014) . - p. 41-50 Titre : Effect of screw rotation speed on the properties of polycarbonate/vapor-grown carbon fiber composites prepared by melt compounding Type de document : texte imprimé Auteurs : Shuichi Tanoue, Auteur ; J. Nithikaranjanatharn, Auteur ; H. Okuzono, Auteur ; H. Ueda, Auteur ; Hideyuki Uematsu, Auteur ; Y. Iemoto, Auteur Année de publication : 2014 Article en page(s) : p. 41-50 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Composites à fibres de carbone à croissance en phase vapeur Déformations (mécanique) Essais dynamiques Extrudeuse bi-vis Mouvement rotatoire Polycarbonates Rupture (mécanique) Traction (mécanique) Index. décimale : 668.4 Plastiques, vinyles Résumé : The effect of screw rotation speed on the mechanical property and thermal conductivity of polycarbonate (PC)/vapor-grown carbon fiber (VGCF) composites prepared by a twin screw extruder was discussed in this paper. Two types of VGCF (VGCF-H, the aspect ratio of 40, and VGCF-S, the aspect ratio of 100) were used. In the tensile test, the breaking pattern of PC composite changed to brittle failures by adding VGCF-H irrespective of screw rotation speed. Young's modulus of PC/VGCF-H slightly increased with the screw rotation speed. On the other hands, the breaking strain of PC/VGCF drastically decreased above 150 min?1. Young's modulus of PC/VGCF-S slightly increased with screw rotation speed until 150 min?1, however, it decreased at 175 min?1. The thermal conductivity of PC/VGCF-H was independent of the screw rotation speed. In contrast, the thermal conductivity of PC/VGCF-S gradually increased with screw rotation speed until 150 min?1 and it also decreased at 175 min?1. From the SEM observation and rheological behavior, the dispersion state of VGCF-H in PC/VGCF-H was independent of the screw rotation speed. On the other hands, the network structures of VGCF-S were observed in PC/VGCF-S and the state of these network structures depended on the screw rotation speed. It was clarified that the mechanical property and thermal conductivity of PC/VGCF were attributable to the dispersion state of VGCF. Note de contenu : - Mechanical property and thermal conductivity - Evaluation of dispersion state of VGCF DOI : 10.3139/217.2799 En ligne : https://drive.google.com/file/d/1KAe1qYfjaYPZuimZ86w5le82-luirDQE/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20574 [article]

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Thermal conductivity of polypropylene composites with combined boron nitride fillers / W. Cheewawuttipong in INTERNATIONAL POLYMER PROCESSING, Vol. XXIX, N° 2 (05/2014)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXIX, N° 2 (05/2014) . - p. 214-220 Titre : Thermal conductivity of polypropylene composites with combined boron nitride fillers Type de document : texte imprimé Auteurs : W. Cheewawuttipong, Auteur ; D. Fuoka, Auteur ; Shuichi Tanoue, Auteur ; Hideyuki Uematsu, Auteur ; Y. Iemoto, Auteur Année de publication : 2014 Article en page(s) : p. 214-220 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Charges (matériaux) Composites Nitrure de bore Le nitrure de bore est un composé chimique du bore et de l'azote, de formule chimique brute BN (nombre égal d'atomes de chaque élément). Le nitrure de bore est isoélectronique avec le carbone et, comme ce dernier, existe sous plusieurs formes polymorphiques, dont l'une est analogue au diamant et l'autre au graphite. La forme diamant est l'un des matériaux les plus durs connus et la forme graphite est un lubrifiant apprécié. De plus, ces deux polymorphes possèdent des propriétés d'absorption radar. Polypropylène Taille des particules Thermocinétique Index. décimale : 668.9 Polymères Résumé : We prepared polypropylene (PP) filled with boron nitride (BN) particles by melt compounding. The effects of filler content, particle size, and combined filler on the thermal conductivity of PP/BN composites were investigated. The results indicated that the thermal conductivities depend on the content and BN particle size. The good dispersion of BN particles of intermediate size in PP matrices led to a higher thermal conductivity than that of PP matrices containing small and large BN particles in which the agglomeration of BN particles was observed. The incorporation of BN particles of two different sizes could enhance the thermal conductivities of PP composites relative to those of composites containing BN particles of a single size at the same total content. A PP composite containing 50?wt% combined fillers with a mixture of BN particles measuring 45??m and 10??m at a weight ratio 1?:?4 showed the highest thermal conductivity in this experiment. Furthermore, several models for predicting the thermal conductivity of the composites were studied. Note de contenu : - EXPERIMENTAL : Materials - Preparation of PP/BN composites - Testing - RESULTS AND DISCUSSION : Thermal conductivity of composites containing BN particles of a single size - The morphologies of PP composites containing BN particles of a single size - Prediction of thermal conductivity of the composites by using calculation model - Thermal conductivity of PP composites with combinations of BN particles of different sizes - The morphologies of PP composites with combinations of BN particles of different sizes - Dynamic mechanical analysis DOI : 10.3139/217.2833 En ligne : https://drive.google.com/file/d/1cDIqmzts43VE9D2GwxtryafINnAPh0I1/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21315 [article]

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