Application of the PTT model for capillary extrusion of rubber compounds / S. H. Choi in INTERNATIONAL POLYMER PROCESSING, Vol. XXIV, N° 4 (09/2009)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXIV, N° 4 (09/2009) . - p. 326-333 Titre : Application of the PTT model for capillary extrusion of rubber compounds Type de document : texte imprimé Auteurs : S. H. Choi, Auteur ; M.-Y. Lyu, Auteur Année de publication : 2009 Article en page(s) : p. 326-333 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alliages polymères Caoutchouc Elastomères -- Extrusion Extrusion capillaire Gonflement (physique) Phénomènes de relaxation (matériaux) Simulation par ordinateur Viscoélasticité Index. décimale : 668.9 Polymères Résumé : Rubber compounds have high viscoelastic property. One of the viscoelastic behaviors shown in profile extrusion is an extrudate swell and circulation flow at the corner of inside of die. Application of viscoelastic model to a capillary extrusion has been investigated in this study. Experiments and simulations have been performed using Fluidity Tester and commercial computational fluid dynamics (CFD) code, Polyflow respectively. Die swell of rubber compounds in a capillary die were predicted using a non-linear differential viscoelastic model, Phan-Thien and Tanner (PTT) model for various relaxation times and relaxation modes. As relaxation time and number of relaxation mode increase, die swell increases. The results of simulations were compared with the experiment. Pressure and velocity distributions, and circulation flows at the corner of reservoir have been analyzed through computer simulation. Two and three relaxation modes with large range of relaxation time examined in this study showed good agreement with experimental results of die swell and well represented circulation flow at the corner of reservoir in the capillary die. DOI : 10.3139/217.2172 En ligne : https://drive.google.com/file/d/1gPjMzxXA2tjrSuEJaB3HFkPoWSt4QHJG/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6077 [article]

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Applications of thermal scanning and capillary extrusion rheometry / R. E. Carter in LES CAHIERS DE RHEOLOGIE, Vol. XI, N° 3-4 (10/1993)

[article]  inLES CAHIERS DE RHEOLOGIE > Vol. XI, N° 3-4 (10/1993) . - p. 205-210 Titre : Applications of thermal scanning and capillary extrusion rheometry Type de document : texte imprimé Auteurs : R. E. Carter, Auteur ; F. S. Baker, Auteur Année de publication : 1993 Article en page(s) : p. 205-210 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Extrusion capillaire Matières plastiques -- Extrusion:Polymères -- Extrusion Polycarbonates Polypropylène Polystyrène Rhéologie Rhéométrie Terpolymère acrylonitrile butadiène styrène Viscosité Index. décimale : 668.9 Polymères Résumé : Two techniques relatively new to the art will be described. Thermal scanning rheometry is valuable for measuring changes in rheological properties as a function of time for thermosetting materials, or as a function of time for thermosetting materials, or as a function of temperature for thermoplastic materials. Materials from a range of industries, including surface coatings, polymer resins, adhesives and foods, will be used to illustrate the value of the PL-thermal scanning rheometer as both a quality assurance and research and development instrument. The use of the "thrust" apparatus in conjunction with an ACER 2000 capillary extrusion rheometer for determining pressure dependence of viscosity will be described. Results obtained for some common polymer melts will be shown, as will viscosity data for concentrated solutions of polystyrene at temperature above the boiling point of the solvent. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5832 [article]

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Basic study of extensional flow mixing for the dispersion of carbon nanotubes in polypropylene by using capillary extrusion / K. Matsumoto in INTERNATIONAL POLYMER PROCESSING, Vol. 36, N° 4 (2021)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 36, N° 4 (2021) . - p. 379-387 Titre : Basic study of extensional flow mixing for the dispersion of carbon nanotubes in polypropylene by using capillary extrusion Type de document : texte imprimé Auteurs : K. Matsumoto, Auteur ; T. Tanaka, Auteur Année de publication : 2021 Article en page(s) : p. 379-387 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Charges (matériaux) Dispersions et suspensions Extrusion capillaire Matières plastiques -- Extrusion Mélange Nanotubes Polypropylène Rhéologie Viscoélasticité Index. décimale : 668.4 Plastiques, vinyles Résumé : This study evaluated the mixing effect of simple uniaxial extensional flow for the dispersion of multiwalled carbon nanotubes (MWCNTs) into polypropylene (PP) as a nonpolar matrix. An only converging flow allowed for a high strain rate and was suitable for the compounding process. The extensional flow was characterized from the entrance pressure drop (ΔP0) at the converging section. Thus, in this study, capillary extrusion was employed to generate uniaxial extensional flow. Based on the hypothesis that the dispersion of nanofillers depends on the magnitude of flow-induced stress, ΔP0, which related to extensional stress, was measured directly during capillary extrusion by using an orifice die. The influences of the mass flow rate and the hole diameter in the orifice die, which affected ΔP0, on the extrusion of PP nanocomposites with an MWCNT loading of 1.0 wt.% were studied. The extruded samples were collected, and the dispersion state was evaluated based on the melt viscoelastic properties, volume resistivity, and morphological observations by optical microscopy (OM) and transmission electron microscopy (TEM). The agglomeration area of the MWCNTs decreased with higher ΔP0 (higher mass flow rate and smaller hole diameter), which increased the uniformity of the dispersion. Moreover, the influence of the length-to-diameter (L/D) ratio of the hole in the capillary die on the dispersion state of the MWCNTs was investigated. A higher L/D ratio of the capillary die did not improve the dispersion state, although shear and extensional stresses were provided. Note de contenu : - Introduction - Theory - Experimental : Materials and preparation of the nanocomposite - Capillary extrusion - Evaluation of the dispersion state - RESULTS AND DISCUSSION : Rheological properties in capillary extrusion - Morphological assessment of the dispersion state - Viscoelastic properties and volume resistivity - Comparison of orifice die and capillary die - Table 1 : The conditions of piston speed and mass flow rate Q for capillary extrusion at a constant temperature of 200°C - Table 2 : Entrance pressure drop (ΔP0) and pressure drop inside the capillary hole (ΔPcap) as a function of the different hole diameters DOI : https://doi.org/10.1515/ipp-2020-4022 En ligne : https://drive.google.com/file/d/1aEEaI2_RyG8J1romHG2erjvLumHzgEnT/view?usp=shari [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36710 [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 rubber reinforcement with filler on extrusion flow and extrudate swell / Hidenori Hirai in INTERNATIONAL POLYMER PROCESSING, Vol. 37, N° 2 (2022)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 37, N° 2 (2022) . - p. 226-235 Titre : Effect of rubber reinforcement with filler on extrusion flow and extrudate swell Type de document : texte imprimé Auteurs : Hidenori Hirai, Auteur ; Hideyuki Uematsu, Auteur ; Yuji Sakai, Auteur ; Shuichi Tanoue, Auteur Année de publication : 2022 Article en page(s) : p. 226-235 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caoutchouc styrène-butadiène Charges (matériaux) Dioxyde de titane Elastomères -- Extrusion Extrusion capillaire Mesure Rhéologie Silice La silice est la forme naturelle du dioxyde de silicium (SiO2) qui entre dans la composition de nombreux minéraux. La silice existe à l'état libre sous différentes formes cristallines ou amorphes et à l'état combiné dans les silicates, les groupes SiO2 étant alors liés à d'autres atomes (Al : Aluminium, Fe : Fer, Mg : Magnésium, Ca : Calcium, Na : Sodium, K : Potassium...). Les silicates sont les constituants principaux du manteau et de l'écorce terrestre. La silice libre est également très abondante dans la nature, sous forme de quartz, de calcédoine et de terre de diatomée. La silice représente 60,6 % de la masse de la croûte terrestre continentale. Viscoélasticité Index. décimale : 668.4 Plastiques, vinyles Résumé : The extrusion process of silica rubber through a chemical reaction is unstable, and the flow mechanism in the extruder is still unclear. In this study, styrene-butadiene rubber (SBR) has been chosen as the matrix and the reinforcing effects of two different kinds of fillers, silica and titanium dioxide, have been investigated on SBR. Additionally, the effect of the properties of the SBR/filler composites on extrudate swelling has been examined. The reinforcing effect of the filler was confirmed by dynamic viscoelasticity, and the swell ratio was measured using a capillary rheometer. The results suggest that titanium dioxide has no reinforcing effect, as there is no interaction between titanium dioxide and the molecular structure of SBR. In contrast, there was a significant interaction between silica and SBR. It was found that the bound rubber, which is an SBR gel with restricted molecular chains, causes a reduction in the swell ratio, and this reduction effect is larger than that caused by filling the filler in the matrix. Furthermore, it was observed that this bound rubber deforms during flow and affects the extrudate swell phenomenon. Note de contenu : - EXPERIMENTAL : Materials - Dynamic viscoelasticity measurement - Morphology of filler in the rubber - Capillary extrusion - Bound rubber measurement - RESULTS AND DISCUSSION : Dynamic viscoelasticity and morphology - Effect of filler on capillary extrusion characteristics - Effect of bound rubber on capillary extrusion characteristics - Table : Composition of the compounds DOI : https://doi.org/10.1515/ipp-2022-4153 En ligne : https://drive.google.com/file/d/1vNb4ggmDR9uDhqNpZ1hISFfoI07hKyCf/view?usp=shari [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37627 [article]

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Paste extrusion and mechanical properties of PTFE / M. Ansari in INTERNATIONAL POLYMER PROCESSING, Vol. XXX, N° 5 (11/2015)  

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

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