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Thermoplastic cellulose stearate and cellulose laurate : Melt rheology, processing and application potential / Illia Krasnou in INTERNATIONAL POLYMER PROCESSING, Vol. XXX, N° 2 (05/2015)
[article]
Titre : Thermoplastic cellulose stearate and cellulose laurate : Melt rheology, processing and application potential Type de document : texte imprimé Auteurs : Illia Krasnou, Auteur ; E. Tarasova, Auteur ; T. Märtson, Auteur ; A. Krumme, Auteur Année de publication : 2015 Article en page(s) : p. 210-216 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acides gras
Esters de cellulose
Etat fondu (matériaux)
Laurate de cellulose
Polyéthylène basse densité
Rhéologie
Stéarate de cellulose
ThermoplastiquesUne matière thermoplastique désigne une matière qui se ramollit (parfois on observe une fusion franche) d'une façon répétée lorsqu'elle est chauffée au-dessus d'une certaine température, mais qui, au-dessous, redevient dure. Une telle matière conservera donc toujours de manière réversible sa thermoplasticité initiale. Cette qualité rend le matériau thermoplastique potentiellement recyclable (après broyage). Cela implique que la matière ramollie ne soit pas thermiquement dégradée et que les contraintes mécaniques de cisaillement introduites par un procédé de mise en forme ne modifient pas la structure moléculaire.Index. décimale : 668.4 Plastiques, vinyles Résumé : In this work thermoplastic materials from cellulose fatty acid esters were manufactured, their properties described and application and processing perspectives evaluated. Rheological properties of some cellulose esters in melt were studied under conditions similar to those usually used in industrial polymer processing. Thermoplastic properties of cellulose esters were compared with properties of low density polyethylene under the same conditions. It was discovered that long chain fatty acid cellulose esters could be processed in the same way as commodity polymers, but these materials need further improvement for being industrially applied as thermoplastic polymers. Note de contenu : - EXPERIMENTAL : Materials and instruments - Sample preparation - Rheological measurements - Morphometry and microscopy
- RESULTS AND DISCUSSION : Infrared spectroscopy - Differential scanning calorimetry - Rheological properties - Morphology and microscopyDOI : 10.3139/217.2980 En ligne : https://drive.google.com/file/d/1C6clFEPd4v9c9fyqxbrrIvx8K4FOMFlz/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23894
in INTERNATIONAL POLYMER PROCESSING > Vol. XXX, N° 2 (05/2015) . - p. 210-216[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 17180 - Périodique Bibliothèque principale Documentaires Disponible Three-dimensional simulation of vortex growth within entry flow of a polymer melt / Huan-Chang Tseng in INTERNATIONAL POLYMER PROCESSING, Vol. 38, N° 1 (2023)
[article]
Titre : Three-dimensional simulation of vortex growth within entry flow of a polymer melt Type de document : texte imprimé Auteurs : Huan-Chang Tseng, Auteur Année de publication : 2023 Article en page(s) : p. 126-132 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Ecoulement extensionnel
Ecoulements tourbillonnaires
Etat fondu (matériaux)
Imagerie tridimensionnelle
Rhéologie
Simulation par ordinateur
ViscositéIndex. décimale : 668.4 Plastiques, vinyles Résumé : The corner vortex phenomenon occurring in entry flow is relevant to both polymer rheology and polymer processing. The famous viscoelastic constitutive equations in numerical computations of fluid mechanics have always had limited relevance at low apparent shear rates. However, three-dimensional (3D) simulations of viscoelastic fluids have been rarely found in advanced rheology. Recently, the GNF-X (eXtended Generalized Newtonian Fluid) constitutive equation of the weighted shear/extensional viscosity developed in advanced rheology of complex fluids has been incorporated into state-of-the-art predictive engineering tools. Thereby, 3D numerical simulations of entry flow were performed for a LDPE (low-density polyethylene) melt. As a validation, the predicted vortex streamlines are in good agreement with related experimental observations. More importantly, the simulation results show the vortex growth with respect to apparent shear rates, contraction ratios, and inlet angles. In particular for extensional viscosity, the stronger extension hardening characteristic yields a large vortex size. Note de contenu : - Table 1 : Parameters of the Carreau model for the shear viscosity of LDPE melt at 150 °C.
- Table 2 : Parameters of the Trouton ratio for the extensional viscosity of LDPE melt at 150 °C.DOI : https://doi.org/10.1515/ipp-2022-4277 En ligne : https://drive.google.com/file/d/1R1Nq5YhFwAdfapJJLp28cxKT2kyIUXw1/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39200
in INTERNATIONAL POLYMER PROCESSING > Vol. 38, N° 1 (2023) . - p. 126-132[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 24052 - Périodique Bibliothèque principale Documentaires Disponible Tribo-mechanical and structural characterizations of LLDPE matrix bio-composite reinforced with almond shell micro-particles : effects of the processing methodology / Mongi Boujelben in INTERNATIONAL POLYMER PROCESSING, Vol. 39, N° 3 (2024)
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Titre : Tribo-mechanical and structural characterizations of LLDPE matrix bio-composite reinforced with almond shell micro-particles : effects of the processing methodology Type de document : texte imprimé Auteurs : Mongi Boujelben, Auteur ; Mohamed Abid, Auteur ; Mohamed Kharrat, Auteur ; Maher Dammak, Auteur Année de publication : 2024 Article en page(s) : p. 367-377 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation
Composites -- Propriétés mécaniques
Coquilles d'amande
Etat fondu (matériaux)
Mélange
Particules (matières)
Physique de l'état solide
Polyéthylène basse densité linéaire
Poudres
Renforts (matériaux)
Tribologie (technologie)Index. décimale : 668.4 Plastiques, vinyles Résumé : The objective of this research work is to examine the effect of mixing operation in the reinforcement of linear low density polyethylene (LLDPE) with almond shell powder (ASP). Two groups of bio-composites mixed in solid state and melt extrusion state were developed by the standard thermo compression molding process. For each group of bio-composites developed, the mass percentage of ASP was varied from 5 % to 40 %. Tensile and friction tests and micro structural analyzes were carried out. The main results show that the addition of ASP particles: decreases the maximum tensile stress and increases the rigidity of the two types of bio-composites produced. A significant improvement was observed in terms of maximum stress and Young’s modulus of the bio-composites mixed in the molten state compared to those mixed in the solid state. Microscopic observations concluded that the melt-blended ASPs were better covered by the LLDPE matrix and the dispersion was successfully achieved. Friction tests have shown an improvement in tribological performance thanks to the addition of an optimal percentage of ASP equal to 20 % in the case of bio-composites mixed in the molten state. From this research work, it can be concluded that the LLDPE/ASP homogenization method influences the mechanical and tribological properties of bio-composites. Note de contenu : - MATERIALS : ASP bio-fillers - LLDPE matrix - Mixing of bio-charges and matrix
- CHARACTERIZATION : Microscopic observation - Mechanical characteristics - Friction and wear test - Morphological characterization of wear traces by SEM-EDX
- RESULTS AND DISCUSSION : Microscopic observations - Mechanical results - Tribological resultsDOI : https://doi.org/10.1515/ipp-2023-4384 En ligne : https://drive.google.com/file/d/1K22_jokwDeuk2x4mTXJWnqtYkXWBOv46/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40878
in INTERNATIONAL POLYMER PROCESSING > Vol. 39, N° 3 (2024) . - p. 367-377[article]Ultra low voltage curing of acrylic hot melt PSAs / Roopram Ramharack in ADHESIVES AGE, Vol. 39, N° 13 (12/1996)
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Titre : Ultra low voltage curing of acrylic hot melt PSAs Type de document : texte imprimé Auteurs : Roopram Ramharack, Auteur ; Rama Chandran, Auteur ; Smita Shah, Auteur ; Deepak Hariharan, Auteur ; John Orloff, Auteur ; Paul Foreman, Auteur Année de publication : 1996 Article en page(s) : p. 40-43 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésifs thermofusibles
Etat fondu (matériaux)
Polyacryliques
Réticulation (polymérisation)
ViscositéIndex. décimale : 668.3 Adhésifs et produits semblables Résumé : Recent advances in electron beam equipment design and in materials development have made EB curing of pressure sensitive adhesives affordable, practical and possible. Note de contenu : - ADVANTAGES OF RADIATION PROCESSING
- POLYMER SYNTHESIS : EB polymer - UV polymer
- VISCOSITY PROFILES
- CURED POLYMER PROPERTIES
- ULTRA LOW VOLTAGE CURE
- APPLICATIONSEn ligne : https://drive.google.com/file/d/1Zsd0nev01LJmDsyQVyQo5HGUPhEYqICt/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20554
in ADHESIVES AGE > Vol. 39, N° 13 (12/1996) . - p. 40-43[article]Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 001070 - Périodique Bibliothèque principale Documentaires Exclu du prêt Understanding softening of amorphous materials for FFF applications / José Luis Colon Quintana in INTERNATIONAL POLYMER PROCESSING, Vol. 37, N° 1 (2022)
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Titre : Understanding softening of amorphous materials for FFF applications Type de document : texte imprimé Auteurs : José Luis Colon Quintana, Auteur ; Tim Osswald, Auteur Année de publication : 2022 Article en page(s) : p. 120-138 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chimie analytique
Chlorure de polyvinyle
Etat fondu (matériaux)
Polyamide 6
PolyamidesUn 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.
Polymères amorphes
Polymères cristallins
Polypropylène
Rhéologie
Transition de phaseEn physique, une transition de phase est une transformation du système étudié provoquée par la variation d'un paramètre extérieur particulier (température, champ magnétique...).
Cette transition a lieu lorsque le paramètre atteint une valeur seuil (plancher ou plafond selon le sens de variation). La transformation est un changement des propriétés du système.
Transition vitreuseIndex. décimale : 668.4 Plastiques, vinyles Résumé : The work explores the fundamentals of the softening process for amorphous materials expanding on the work presented by Stammers and Beek (Stammers, E. and Beek, W.J. (1969). The melting of a polymer on a hot surface. Polym. Eng. Sci. 9). The pressure induced melt removal process was studied in detail. The process, although fundamental, allows for an understanding of the phase transition of materials during the fused filament fabrication (FFF) process. Experimental results were analyzed using state-of-the-art equipment. A total of four materials were tested. PVC and PC are amorphous materials, and PA6 and PP are semi-crystalline materials. A setup was built to allow the application of a constant force. The resulting melt film was analyzed using computed tomography technology. The experimental results were compared with numerical simulation results originating from COMSOL Multiphysics and the analytical solution derived by Stammers and Beek. Rheological and thermo-mechanical tests were used to find the softening temperature of amorphous materials. Results showed a straightforward transition for the melting temperature of semi-crystalline materials and softening temperature of amorphous materials. It is suggested that for amorphous materials, the glass transition temperature can be used as the softening temperature (T s = T g ). When comparing all three results (experimental, analytical, and numerical), values are within the same range and magnitude. A good approximation was achieved for PA6 and PVC, which have semi-crystalline and amorphous structures, respectively. Results provide insights into the phase transition process and phase change mechanisms during the extrusion of materials in the fused filament fabrication process. Note de contenu : - EXPERIMENTAL : Materials - Setup - Experimental procedure - Micro computed tomography (µ-CT) of melt film - Pressured induced melt removal solution - Thermogravimetric analysis (TGA) - Differntial scanning calorimetry (DSC) - Double shear test - COMSOL multiphysics - Rheological properties
- PRESSURE INDUCED MELT REMOVAL PROCESS INCLUDING CONVECTION TERM : Mathematical derivation
- RESULTS AND DISCUSSION : TGA results - DSC results - DMA results - DSC versus DMA - Rheological properties - Experimental results - Analytical model - Numerical solution : COMSOL multiphysics - Comparison of methods
- Table 1 : Processing temperatures in °C
- Table 2 : Compression molding parameters
- Table 3 : Temperature range for double shear test
- Table 4 : Rheometer temperatures
- Table 5 : Melting temperature and heat of fusion of PA6 and PP
- Table 6 : Glass transtition temperature of PC and PVC
- Table 7 : Complex shear modulus model parameters (modulus with units of MPa)
- Table 8 : Carreau - Yasuda parametersDOI : https://doi.org/10.1515/ipp-2021-4155 En ligne : https://drive.google.com/file/d/1OTuW0XxLIBbnXjss8QsmMh0aOlV8ZUQb/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38446
in INTERNATIONAL POLYMER PROCESSING > Vol. 37, N° 1 (2022) . - p. 120-138[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23736 - Périodique Bibliothèque principale Documentaires Disponible Unlimited shear as a source of information in polymer melt processing / Hermann Janeschitz-Kriegl in INTERNATIONAL POLYMER PROCESSING, Vol. XXIX, N° 3 (07/2014)
PermalinkUsing symbolic regression models to predict the pressure loss of non-newtonian polymer-melt flows through melt-filtration systems with woven screens / S. Pachner in INTERNATIONAL POLYMER PROCESSING, Vol. 36, N° 4 (2021)
PermalinkUsing a visualization mold to discuss the influence of gas counter pressure and molt temperature on the fountain flow effect / Wen-Ren Jong in INTERNATIONAL POLYMER PROCESSING, Vol. XXXIII, N° 2 (05/2018)
PermalinkValidation of an in-mold multivariate sensor for measurement of melt temperature, pressure, velocity, and viscosity / Gordon Guthrie in INTERNATIONAL POLYMER PROCESSING, Vol. XXXII, N° 4 (08/2017)
PermalinkLa valorisation des déchets plastiques révolutionnée / Skander Mani in PLASTIQUES & CAOUTCHOUCS MAGAZINE, N° 920 (04-05/2015)
PermalinkVariable spinning line for melt spinning / Bernhard Krautwurst in CHEMICAL FIBERS INTERNATIONAL, (09/2016)
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