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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]
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
ViscoélasticitéIndex. 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 diametersDOI : 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 : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36710
in INTERNATIONAL POLYMER PROCESSING > Vol. 36, N° 4 (2021) . - p. 379-387[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23734 - Périodique Bibliothèque principale Documentaires Disponible Bath-life issues in curing systems : a viscosity-time study / Sunil Dhoot in ADHESIVES AGE, Vol. 41, N° 12 (12/1998)
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Titre : Bath-life issues in curing systems : a viscosity-time study Type de document : texte imprimé Auteurs : Sunil Dhoot, Auteur ; Perlita Taylor, Auteur Année de publication : 1998 Article en page(s) : p. 34-36 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésifs sensibles à la pression
Formulation (Génie chimique)
Rhéologie
SiliconesLes silicones, ou polysiloxanes, sont des composés inorganiques formés d'une chaine silicium-oxygène (...-Si-O-Si-O-Si-O-...) sur laquelle des groupes se fixent, sur les atomes de silicium. Certains groupes organiques peuvent être utilisés pour relier entre elles plusieurs de ces chaines (...-Si-O-...). Le type le plus courant est le poly(diméthylsiloxane) linéaire ou PDMS. Le second groupe en importance de matériaux en silicone est celui des résines de silicone, formées par des oligosiloxanes ramifiés ou en forme de cage (wiki).
ViscositéIndex. décimale : 668.3 Adhésifs et produits semblables Résumé : In many reactive coating systems, such as silicones, the viscosity increases with time. Inhibitors are usually added to control this reaction process. However, the reaction still continues, and after a long time, the viscosity can be so high that it becomes difficult to maintain coatability, coverage and coat weight. In extreme cases, the coating bath can gel and can no longer be applied.
From the application standpoint, it is desirable to have a formulation with a sufficient bath-life. From a productivity standpoint, it is desirable to have higher line speeds. A faster reacting system is desired, as the applied material can be cured to a film rapidly. On the other hand, a faster curing system may have a shorter bath life. Thus, there is a necessity to balance the need for a faster curing system with the need for sufficient bath life.
The purpose of this article is to describe:
- a method for measurement of viscosity as a function of time at a controlled temperature;
- the effect of temperature on the viscosity-time profile; and
- the effect of polymer structure on the viscosity-time profile.Note de contenu : - Continuous measurement of viscosity
- Effect of temperature on the speed of cure
- Effect of polymer structure on the viscosity-time profileEn ligne : https://drive.google.com/file/d/1UVcNH4YYIsvG5xjZZSlaKc0HN1QQmn8w/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20341
in ADHESIVES AGE > Vol. 41, N° 12 (12/1998) . - p. 34-36[article]Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 001440 - Périodique Bibliothèque principale Documentaires Exclu du prêt Benchmark for plasticizers / Anders Magnusson in KUNSTSTOFFE INTERNATIONAL, Vol. 108, N° 4 (04/2018)
[article]
Titre : Benchmark for plasticizers : Phthalate-free plasticizer for flexible PVC on the test stand Type de document : texte imprimé Auteurs : Anders Magnusson, Auteur Année de publication : 2018 Article en page(s) : p. 52-55 Langues : Anglais (eng) Catégories : Buée
Chlorure de polyvinyle
Essais (technologie)
Formulation (Génie chimique)
Matières plastiques -- Additifs
Phtalates -- Suppression ou remplacement
Plastifiants -- Suppression ou remplacement
RhéologieIndex. décimale : 668.4 Plastiques, vinyles Résumé : The properties of polyvinyl chloride are adjusted using plasticizers for many applications. Phthalate-free plasticizers can keep pace here with conventional versions containing phthalates in many technical fields. This article demonstrates that based on a comparative study. Note de contenu : - Hardness and volatility
- Fogging behavior and viscosity
- Polymerization and processing
- FIGURES : 1. The comparison of the shore A hardness shows that PETV is most efficient compared to the other test candidates - 2. Volatility of the softeners. Since the additives have a significant influence on the characteristics of PVC, their amount should remain constant during the entire lifespan of the material - 3. Fogging test according to DIN 75201-A on an automotive film (700g/m2, 75 phr). The reflectometer value was determined on a glass plate. Here the phthalate-free plasticizer trioctyl trimellitate (TOTM) was tested in addition - 4. The viscosity comparison shows that the softener DINCH keeps the plastisol constant over a long period of time, and is therefore well suited for delayed processing - 5. The rheology of the three test candidates shows that plastisol formulation with PETV proceeds more quickly and at lower temperatures - 6. The absorption diagram shows the time in which phthalate-free plasticizers are absorbed in suspension PVC
- TABLES : 1. The initial formulation of the plastisol in which each of the three plasticizers was tested - 2. Processing temperature and time in which the plasticized PVC respectively reach the desired degree of elongationEn ligne : https://drive.google.com/file/d/1WsR90UbT1s46VGcbH_jAXJKYI1PVQ7pQ/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30593
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Code-barres Cote Support Localisation Section Disponibilité 19801 - Périodique Bibliothèque principale Documentaires Disponible Better performance of paint through rheology / M. Veeramani in PAINTINDIA, Vol. LXXI, N° 12 (12/2021)
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Titre : Better performance of paint through rheology : Water based emulsion paints 84 Type de document : texte imprimé Auteurs : M. Veeramani, Auteur Année de publication : 2021 Article en page(s) : p. 119-121 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Revêtements en phase aqueuse:Peinture en phase aqueuse
Rhéologie
ViscositéIndex. décimale : 667.9 Revêtements et enduits Résumé : Now let me take you though the last chapter of rheology, and conclude this topic in water based paints with some fundamentals which one should remember always while making paint. Note de contenu : - Rheology and viscosity ?
- What is viscosity ?
- Why do different substances have different viscosities ?
- Rotational viscometers, ossillatory rheometers, and measuring geometries
- Rotational tests and viscosity
- Some basics of rheology
- Table 1 & 2 : Rotational tests with controlled shear rate (CSR), raw data, and rheological parametersEn ligne : https://drive.google.com/file/d/18NcUsWWnv9CSLh1aJvp5gZaAH_msECm1/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37123
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Code-barres Cote Support Localisation Section Disponibilité 23262 - Périodique Bibliothèque principale Documentaires Disponible
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Titre : Better performance through rheology : Water based emulsion paints 83 Type de document : texte imprimé Auteurs : M. Veeramani, Auteur Année de publication : 2021 Article en page(s) : p. 99-100 Langues : Anglais (eng) Catégories : Revêtements en phase aqueuse:Peinture en phase aqueuse
Rhéologie
ViscositéIndex. décimale : 667.9 Revêtements et enduits Résumé : Now let usus turn our attention as to how better performance in coatings can be ensured through better Rheology. The difference between a paint with trouble-free performance and failure can depend in large part on the rheology of the paint. Rheology is defined as the science of flow and deformation and influences properties such as :
- Transfer of resin and paint
- Pigment dispersion
- Application (brush, roller, reverse or direct roll coat, spray, disc and flow coat)
- Film formation (flow, levelling and film coalescence)
- Storage stabiIity (resistance to hard settling of pigment)
In contrast, viscosity can be defined as the resistance to flow. A discussion of flow and levelling is meaningless without consideration and understanding of viscosity. Simply stated, viscosity is the resistance of a liquid to flow and can be defined in nneasurable values.Note de contenu : - Viscosity characteristics of various fluids
- Viscosity and shear rate requirements for various paint processes
- Rheology profile for multiple paint processes
- Customization of rheological propertiesEn ligne : https://drive.google.com/file/d/1pI-AaoGuopntSehMErqzDmRgPE15ipU2/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37109
in PAINTINDIA > Vol. LXXI, N° 11 (11/2021) . - p. 99-100[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23261 - Périodique Bibliothèque principale Documentaires Disponible Bi-axially oriented blown film technology / Olga. S. Carneiro in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 3 (07/2012)
PermalinkBio-based composites for high-performance materials / Wirasak Smitthipong / Boca Raton [Etats-Unis] : CRC Press - Taylor Francis Group (2015)
PermalinkBio-based polyester itaconates as binder resins for UV-curing offset printing inks / Tobias Robert in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 3 (05/2019)
PermalinkBioadhesive hydrogels for cosmetic applications / Maria Emma Parente in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 37, N° 5 (10/2015)
PermalinkBiologically inspired fighting germs using HCIO hydrogels with smectites / Jessica Gödeker in SOFW JOURNAL, Vol. 148, N° 12 (12/2022)
PermalinkBiréfringence sous écoulement : application à la caractérisation rhéo-optique de différents sytèmes / J. F. Tassin in LES CAHIERS DE RHEOLOGIE, Vol. XIII, N° 1-2 (10/1994)
PermalinkBivariate approach to viscosity adjustment / Michael J. Eiseman in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 67, N° 840 (01/1995)
PermalinkBreaking new ground in vinyl acetate-ethylene technology / Randolph J. Lorenz in ADHESIVES AGE, Vol. 41, N° 8 (08/1998)
PermalinkBrinding tribology and microrheology of thin films / Christian Clasen in APPLIED RHEOLOGY, Vol. 20, N° 4 (2010)
PermalinkBroyage conséquences physicochimiques sur les propriétés rhéologiques de suspensions de dolomie / L. Clerc in LES CAHIERS DE RHEOLOGIE, Vol. X, N° 3-4 (11/1992)
PermalinkCalcul d'écoulements d'un modèle intégral K-BKZ dans une contraction brusque axisymétrique. Formulation théorique et résultats numériques / Yves Bereaux in LES CAHIERS DE RHEOLOGIE, Vol. XI, N° 3-4 (10/1993)
PermalinkDu calcul à la mesure expérimentale / L. Prévors in CAOUTCHOUCS & PLASTIQUES, N° 763 (11/1997)
PermalinkCapillary break-up rheometry of low-viscosity elastic fluids / Lucy E. Rodd in APPLIED RHEOLOGY, Vol. 15, N° 1 (2005)
PermalinkCaractères rhéologiques de pommades gels contenant un dérivé acrylique formulées à partir d'un plan d'expérience / V. Lovera in LES CAHIERS DE RHEOLOGIE, Vol. XV, N° 4 (10/1997)
PermalinkCaractérisation du comportement thixotrope : méthodes instrumentales actuelles / J. Bouton in LES CAHIERS DE RHEOLOGIE, Vol. XIII, N° 1-2 (10/1994)
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