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The viscosity of a liquid / Jutta Gehm in SOFW JOURNAL, Vol. 142, N° 5 (05/2016)
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Titre : The viscosity of a liquid Type de document : texte imprimé Auteurs : Jutta Gehm, Auteur Année de publication : 2016 Article en page(s) : p. 50-53 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Liquides (Chimie)
Rhéologie
ViscositéIndex. décimale : 668.5 Parfums et cosmétiques Résumé : Again and again we are commissioned as an expert agency in the field of rheology to determine the viscosity of a substance as one numerical value. But what does this mean ? Is there ever an absolute viscosity of a liquid ? As is well known, the viscosity of any fluid substance is dependent on various external influences, such as temperature, pressure, shear stress, and also on the previous history of the sample preparation. The viscosity of a liquid is not so simple.
The essential question that is answered in the viscosity measurement is, how to influence the flow properties of the product so that it is most easily processed (pumping, mixing, filling,…) and how to achieve the desired properties for the intended application of the product. But how can you gave an answer to this complex question as simply as possible ?
Rotational or oscillatory rheometers with DIN measurement systems can recreate many application conditions and thus can practically be used to determine the viscosity. Automated measurement results can be obtained quickly and easily. Algorithm provide the corresponding figures for the decision : good or bad.Note de contenu : - VISCOSITY MEASUREMENT USING A ROTATIONAL VISCOMETER
- SAME SAMPLE - DIFFERENT : Shear rate. What does that mean ?
- SHEAR RATES IN PRACTICE : Example : applying a lotion to the skin - Example : Shear rate during flow through a nozzle
- SINGLE-POINT MEASUREMENT AND FLOW CURVE
- CHARACTERIZATION OF THE FLOW BEHAVIOR BY KEY FIGURESPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26321
in SOFW JOURNAL > Vol. 142, N° 5 (05/2016) . - p. 50-53[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 18081 - Périodique Bibliothèque principale Documentaires Disponible Thermal characterization of solvent-free epoxy coatings by rheology and kinetics combined / Weih Q. Lee in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 1 (01/2020)
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Titre : Thermal characterization of solvent-free epoxy coatings by rheology and kinetics combined Type de document : texte imprimé Auteurs : Weih Q. Lee, Auteur Année de publication : 2020 Article en page(s) : p. 145-155 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse mécanique dynamique
Analyse thermique
Caractérisation
Epoxydes
Formulation (Génie chimique)
Gélification
Réticulation (polymérisation)
Revêtements organiques
Revêtements poudre:Peinture poudre
Rhéologie
Viscoélasticité
VitrificationIndex. décimale : 667.9 Revêtements et enduits Résumé : Rheology and kinetics are a pair of indispensable attributes in defining thermally reactive polymer coatings and paints. In this work, cure paths of volatile organic compound-free epoxy powder coatings, under heat, were characterized by viscoelastic and kinetic techniques. The essential rheological meanings of the gel point, the minimum complex viscosity, and the shear moduli from dynamic mechanical analysis curves were elucidated from applied formulation perspectives. Meanwhile, the maximum cure reaction rate and the peak temperature from differential scanning calorimetry exothermic profiles were quantitatively interpreted using primarily the extent of cure along with viscoelastic data. Vitrification and devitrification during cure were observed for high glass transition (Tg) epoxy formulations, unless a fast rate of heating was employed to a high enough temperature. Thorough and complete cure description provides strong insights for product development, allowing flow and cure properties to be balanced for optimal line performance. The consolidated approach is applicable to nearly all B-staged thermosetting systems of 100% solids including conditioned prepregs and a variety of adhesives per applications, as well as direct-to-metal primers or topcoats per functions. Note de contenu : - MATERIALS AND METHODS : DMA - DSC - Physicals
- RESULTS AND DISCUSSION : Generic Tg formulations - High Tg formulationsDOI : 10.1007/s11998-019-00248-9 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-019-00248-9.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33734
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 17, N° 1 (01/2020) . - p. 145-155[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21517 - Périodique Bibliothèque principale Documentaires Disponible Thermal mold design in consideration of the temperature control fluid flow / Christian Hopmann in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 4 (08/2013)
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Titre : Thermal mold design in consideration of the temperature control fluid flow Type de document : texte imprimé Auteurs : Christian Hopmann, Auteur ; Philipp Nikoleizig, Auteur Année de publication : 2013 Article en page(s) : p. 361-367 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Conception technique
Isolation thermique
Logiciels
Matières plastiques -- Moulage par injection
Moules d'injection
Rhéologie
Simulation par ordinateur
Systèmes de refroidissement
ThermocinétiqueIndex. décimale : 668.4 Plastiques, vinyles Résumé : The striving for injection molded parts with an increasing functional density leads to more complex molds, which are more and more designed with injection molding simulation. Nowadays, software allows the operator to analyse not only the filling stage, but also the thermal activity within both, the mold and the part during the whole process cycle. However, commercial simulation software for injection molding does not offer the visualisation of the flow of the temperature control medium to get a reliable determination of the pressure drop and the local heat transfer coefficients (HTC). For this reason the potential of an exact implementation of the local HTC „towards the temperature control medium, for improving the prediction precision of the thermal design, has been analysed at the Institute of Plastics Processing (IKV), Aachen. In order to use prior calculated HTCs from Computational Fluids „Dynamics (CFD) simulations inside injection molding simulations, the development of an analogous model was required. An isolation layer between cooling channel and mold was therefore introduced, which allows to set a local heat transfer by varying the geometric dimensions of the layer. Several cooling channel layouts, which differ in geometric aspects (e.g. bends, diameter or fragmentation/consolidation of parallel channels) were studied with this set-up. Note de contenu : - DESIGN OF THE EXPERIMENTAL INJECTION MOLD
- CALCULATION OF PRESSURE DROP BY ANALYTICAL METHODS
- REALISATIONS OF FLOW SIMULATIONS : Pressure loss - Heat transfer coefficient
- LINKING OF CFD AND INJECTION MOLDING SIMULATION
- COMPARISON OF THE CACULATED TEMPERATURE DISTRIBUTIONDOI : 10.3139/217.2697 En ligne : https://drive.google.com/file/d/1uJ6-SkjaRp_sMnkpy7eaKiLifGyi7qsI/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19280
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Code-barres Cote Support Localisation Section Disponibilité 15396 - Périodique Bibliothèque principale Documentaires Disponible Thermal, morphological, rheological and deformation under mechanical loading analyses of recycled polyethylene terephthalates / Kivanc Bakir in INTERNATIONAL POLYMER PROCESSING, Vol. 37, N° 3 (2022)
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Titre : Thermal, morphological, rheological and deformation under mechanical loading analyses of recycled polyethylene terephthalates Type de document : texte imprimé Auteurs : Kivanc Bakir, Auteur ; Deniz Aydemir, Auteur ; Timucin Bardak, Auteur ; Murat Emre Kartal, Auteur Année de publication : 2022 Article en page(s) : p. 287-302 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse thermique
Déformations (mécanique)
Eléments finis, Méthode des
Imagerie numérique
Matières plastiques -- Propriétés thermiques
Matières plastiques -- Recyclage
Morphologie (matériaux)
Polyéthylène téréphtalate
RhéologieIndex. décimale : 668.4 Plastiques, vinyles Résumé : This study aims at determining the mechanical deformation behavior of recycled poly (ethylene terephthalate) (r-PET) with digital image correlation (DIC) and finite element method (FEM), and to investigate the morphological, thermal, and rheological properties of r-PETs. Waste bottles were collected in trash bins and granulated with a cutter. Neat PET (n-PET) was also was used to determine accurately the changes in the properties of r-PET. PET test samples were obtained by injection molding at 260, 265, 270, and 275 °C. DIC and FEM were conducted to detect the deformation behavior of the PETs under mechanical loading. The data showed that the behavior of n-PETs and r-PETs were similar, and the stress distribution was found to densify in various areas for both PETs. The mechanical properties generally increased with increasing processing temperature, the best mechanical properties being obtained for thPETs processed at 275 °C. Scanning electron microscopy (SEM) analysis showed that the morphology of all the PETs were similar. Thermal stability was also found to be similar. The rheological moduli of n-PET processed at 260 °C were the highest, while processing r-PET at 275 °C improved its rheological properties. Note de contenu : - MATERIALS AND METHODS : Materials - Preparation of PET test samples - Methods
- RESULTS AND DISCUSSION : Mechanical properties of the PETs and the deformation analysis with DIC and FEM under mechanical testing - Morphological analysis - Thermal properties - Rheological properties
- Table 1 : TGA Data for n-PET and r-PET processed at different temperaturesDOI : https://doi.org/10.1515/ipp-2021-4165 En ligne : https://drive.google.com/file/d/13qTzJI31__flej8f48rzLT0zepAVN-Da/view?usp=shari [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37907
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Code-barres Cote Support Localisation Section Disponibilité 23738 - Périodique Bibliothèque principale Documentaires Disponible Thermal, tensile, electrical, dynamic mechanical thermal and rheological properties of polyvinylidene fluoride and fluoroelastomer composites filled with carbon black / M. D. Moezzi in INTERNATIONAL POLYMER PROCESSING, Vol. XXXIV, N° 1 (03/2019)
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Titre : Thermal, tensile, electrical, dynamic mechanical thermal and rheological properties of polyvinylidene fluoride and fluoroelastomer composites filled with carbon black Type de document : texte imprimé Auteurs : M. D. Moezzi, Auteur ; Mohammed Karrabi, Auteur ; Y. Jahani, Auteur Année de publication : 2019 Article en page(s) : p. 111-120 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alliages polymères
Analyse thermique
Analyse thermomécanique dynamique
Caractérisation
Charges (matériaux)
Composites thermoplastiques -- Propriétés électriques
Composites thermoplastiques -- Propriétés mécaniques
Composites thermoplastiques -- Propriétés thermiques
Conduction électrique
Elasticité
Elastomères
Fluoropolymères
Noir de carbone
Percolation
Polyfluorure de vinylidène
Rhéologie
Traction (mécanique)
Transition vitreuseIndex. décimale : 668.4 Plastiques, vinyles Résumé : The present work was focused on studying the effects of different CB loadings on the rheological, thermal, tensile, dynamic mechanical and electrical properties of polyvinylidenefluoride (PVDF) and FKM composites. To these ends, the CB grade and method chosen for compound preparation were CB (N330) and melt mixing, respectively. The composites were melt blended with CB at 190 °C in an internal mixer, after which the properties of filled and unfilled composites were compared. The presence of CB improved the mechanical properties, such as the Young's modulus and tensile strength, and increased thermal stability given the high thermal stability of CB and the interaction between the CB particles and the polymer matrices. The dynamic mechanical thermal analysis (DMTA) showed the glass transition temperatures of the composites. The analysis also revealed that the area under the loss tangent (tan δ) peak decreased and that the tan δ temperature of the rubber phase increased with CB loading. The increase in the electrical conductivity of the composites under different CB loadings was also examined, and the percolation threshold of conductive thermoplastic vulcanizate composite based on conductive CB was observed. The effect of CB and its content on rheological behavior of the PVDF/FKM blends was studied and the experimental data was correlated by a physical model named General Equation Model (GEM). A relation between rheology and conductivity of the blends with filler percolation was found. Note de contenu : - EXPERIMENTAL : Materials - Sample preparation and composition - Composites characterization
- RESULTS AND DISCUSSION : Thermal analysis - DSC - Mechanical properties - DMTA - Electrical properties - Rheological analysisDOI : 10.3139/217.3588 En ligne : https://drive.google.com/file/d/10vtDNZwLGTJBuTNtHl0VwfEQc0opEGwM/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31921
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Code-barres Cote Support Localisation Section Disponibilité 20669 - Périodique Bibliothèque principale Documentaires Disponible Thermique outillage, la révolution en marche / Laurent Pivard in PLASTIQUES & CAOUTCHOUCS MAGAZINE, N° 890 (12/2011)
PermalinkThermoplastic cellulose stearate and cellulose laurate : Melt rheology, processing and application potential / Illia Krasnou in INTERNATIONAL POLYMER PROCESSING, Vol. XXX, N° 2 (05/2015)
PermalinkThermorheology of polyethylene wax modified sulfur asphalt / M. A. Parvez in INTERNATIONAL POLYMER PROCESSING, Vol. XXX, N° 2 (05/2015)
PermalinkThermoset coatings engineered by nature / Simen Prang Folkner in EUROPEAN COATINGS JOURNAL (ECJ), (09/2023)
PermalinkThickening and free-flowing agents / Kevin Neale in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 201, N° 4567 (12/2011)
PermalinkThickening by thinning - A novel liquid rheology additive for selvent-based and solvent-free coatings / Janos Hajas in PAINTINDIA, Vol. XLVII, N° 10 (10/1997)
PermalinkThickening paints for any weather / John J. Rabasco in EUROPEAN COATINGS JOURNAL (ECJ), N° 6 (06/2019)
PermalinkPermalinkThird generation additives / Janos Hajas in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 198, N° 4524 (05/2008)
Permalink"Thixo-élasticité" des fluides complexes : Modélisation du fluage et de l'hystérésis mécanique / D. Quemada in LES CAHIERS DE RHEOLOGIE, Vol. XIII, N° 1-2 (10/1994)
PermalinkThixotropic mud, compacted cake and swelling shale / J.-D. Sherwood in LES CAHIERS DE RHEOLOGIE, Vol. XIII, N° 1-2 (10/1994)
PermalinkThree-dimensional, non-isothermal simulations of the effect of speed ratio in partially-filled rubber mixing / H. Poudyal in INTERNATIONAL POLYMER PROCESSING, Vol. XXXIV, N° 2 (05/2019)
PermalinkThree-dimensional simulation of capillary rheometry for an estimation of extensional viscosity / Huan-Chang Tseng in INTERNATIONAL POLYMER PROCESSING, Vol. 38, N° 2 (2023)
PermalinkThree-dimensional simulation of vortex growth within entry flow of a polymer melt / Huan-Chang Tseng in INTERNATIONAL POLYMER PROCESSING, Vol. 38, N° 1 (2023)
PermalinkThree times faster to gel point / Horst Lange in ADHESION - ADHESIVES + SEALANTS, Vol. 13, N° 4/2016 (2016)
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