Accueil
Détail de l'indexation
Ouvrages de la bibliothèque en indexation 668.9
Ajouter le résultat dans votre panier Affiner la recherche
Thermal flow instability in metal injection molding : experiment and simulation / J. F. Stevenson in INTERNATIONAL POLYMER PROCESSING, Vol. XXI, N° 2 (05/2006)
[article]
Titre : Thermal flow instability in metal injection molding : experiment and simulation Type de document : texte imprimé Auteurs : J. F. Stevenson, Auteur ; F. Ilinca, Auteur Année de publication : 2006 Article en page(s) : p. 198-210 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Metal injection molding (MIM) is similar to plastic molding in many respects, but MIM compounds (metal powders with polymer binders) are more susceptible to thermally induced flow instability because of their higher thermal diffusivity. The flow patterns for a 17-4PH MIM compound were observed and simulated for mold filling through a diaphragm gate over a range of filling times and melt-mold interface temperatures. Simulation predicted the observed free annular jet and internal voids in the molded part and also predicted that initial contact with the outside wall of the gate would eliminate the jet, thereby reducing voids and surface defects. Parts made using a mold with a thicker gate verified these predictions. For combinations of operating conditions and mold geometry that gave large thermally induced viscosity gradients, both observation and simulation showed unstable, asymmetric flow. In these cases, flow slowed and stopped in one region of the gate and accelerated in other regions. When the flow was inherently unstable, simulations predicted an exponential growth in maximum temperature differences at symmetric locations in the mold gate. Based on 34 experimental observations and 102 simulations, a boundary was established between regions of stable and unstable flow in terms of the dimensionless Graetz number Gz (ratio of heat conduction time to fill time) and B, a dimensionless ratio indicating the sensitivity of viscosity to temperature differences in the mold. To establish a common basis for comparison of simulation and experiment, the melt-mold interface temperature was estimated using a heat transfer coefficient, which was a fixed value for experiment and a parameter for simulation. DOI : 10.3139/217.1908 En ligne : https://drive.google.com/file/d/1g5ud0P7fbFQcAdB0JDOuJV2Uu6gVrkYk/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2915
in INTERNATIONAL POLYMER PROCESSING > Vol. XXI, N° 2 (05/2006) . - p. 198-210[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 004675 - Périodique Bibliothèque principale Documentaires Disponible Thermal properties and electrical conductivity of graft copolymers from polystyrene and polyvinyl propionate with polyaniline / S. H. Hosseini in INTERNATIONAL POLYMER PROCESSING, Vol. XXVI, N° 2 (05/2011)
[article]
Titre : Thermal properties and electrical conductivity of graft copolymers from polystyrene and polyvinyl propionate with polyaniline Type de document : texte imprimé Auteurs : S. H. Hosseini, Auteur ; S. M. Musavi, Auteur Année de publication : 2011 Article en page(s) : p. 120-127 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chlorure de polyvinyle
Conducteurs organiques
Conduction électrique
Copolymères greffés -- Propriétés électriques
Copolymères greffés -- Propriétés thermiques
Polyaniline
Polyvinyle propionateIndex. décimale : 668.9 Polymères Résumé : A synthesized graft copolymer from polystyrene (PS) and polyvinyl propionate (PVPr) with polyaniline (PANi) with suitable electrical properties, thermal resistance, solubility and processability was optimized. Samples were prepared in the form of smooth and thin films. Four-point probe method was adapted to examine electrical DC conductivity. It was found that the electrical conductivity and thermal stability of copolymers were increased, but their processability and solubility decreased when PANi increased. Thermal stability of copolymers was investigated by Differential Scanning Calorimetry (DSC) and Thermal Gravimetrical Analysis (TGA). The prepared copolymers were much more thermally stable, soluble, flexible and ability to form a film than polyaniline, polystyrene and polyvinyl propionate. An irreversible exothermic transition was observed by DSC, which is believed to be an indication of cross-linking. Percentage of grafted PANi electrical conductivities of PS-g-PANi and PVPr-g-PANi have been examined and produced conductivities, 3.3 × 10–2and 4.6 × 10–2S/cm respectively. DOI : 10.3139/217.2302 En ligne : https://drive.google.com/file/d/15AifTYX1PpdEcHyxK6YJxpeowmCMNsCo/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11512
in INTERNATIONAL POLYMER PROCESSING > Vol. XXVI, N° 2 (05/2011) . - p. 120-127[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 012997 - Périodique Bibliothèque principale Documentaires Disponible Thermal properties and morphology characteristics of a PP mono-filament and its foam / N. Chuapon in INTERNATIONAL POLYMER PROCESSING, Vol. XXIX, N° 5 (11/2014)
[article]
Titre : Thermal properties and morphology characteristics of a PP mono-filament and its foam Type de document : texte imprimé Auteurs : N. Chuapon, Auteur ; O. Naithamon, Auteur ; Y. Sato, Auteur ; S. Areerat, Auteur ; Hiroshi Ito, Auteur Année de publication : 2014 Article en page(s) : p. 579-587 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Matières plastiques -- Propriétés thermiques
Monofilaments
Morphologie (matériaux)
Mousses plastiques
Polypropylène
Structure cristalline (solide)Index. décimale : 668.9 Polymères Résumé : The polypropylene (PP) mono-filament is an alternative material that can be used for insulation, packaging, and polymer composite applications. In this study, PP mono-filaments were prepared by extrusion free-fall at temperatures of 190, 200, and 210°C through a micro extrusion die with a diameter of 900??m. The free-fall speeds of the filament were controlled by a gear pump driving at speeds ranging from 12.5 to 20.0?min?1, and the extrudates were cooled at room temperature. The PP mono-filaments were subsequently foamed by a batch foaming process with sc-CO2 as the blowing agent at foaming temperatures of 165, 170, 175 and 180°C. The thermal properties and crystallinity of the prepared filaments and their foams were investigated using a DSC. The foam morphology and isotropic foam properties were characterized by SEM micrographs. The results show that the various morphologies of the PP mono-filament foams deviated from the isotropic foam behavior and had isotropic foam index values in the range of 1.1 to 2.3. In addition, the PP mono-filament that was foamed at 175°C expanded in the longitudinal direction and exhibited the highest expansion ratio, but its degree of crystallinity decreased compared to the mono-filaments. PP mono-filament foam represented a narrow crystallization temperature range and crystallization time than mono-filament and tended to a faster crystalline growth. DOI : 10.3139/217.2920 En ligne : https://drive.google.com/file/d/1457bKcafdihSgQ13yCVwGTbw2fqkDFjh/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22223
in INTERNATIONAL POLYMER PROCESSING > Vol. XXIX, N° 5 (11/2014) . - p. 579-587[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 16633 - Périodique Bibliothèque principale Documentaires Disponible Thermally stable polymers from gum rosin of pinus roxburghii / Arundhati Panda in PAINTINDIA, Vol. LXIII, N° 3 (03/2013)
[article]
Titre : Thermally stable polymers from gum rosin of pinus roxburghii Type de document : texte imprimé Auteurs : Arundhati Panda, Auteur ; Himadri Panda, Auteur ; Rakhshinda Panda, Auteur ; Kavita Prakash, Auteur Année de publication : 2013 Article en page(s) : p. 61-68 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Anhydride maléique
BiréfringenceLa biréfringence est la propriété physique d'un matériau dans lequel la lumière se propage de façon anisotrope. Dans un milieu biréfringent, l'indice de réfraction n'est pas unique, il dépend de la direction de polarisation de l'onde lumineuse. (Wikipedia)
ColophaneLa colophane est le résidu solide obtenu après distillation de la térébenthine, oléorésine (appelée aussi gemme), substance récoltée à partir des arbres résineux et en particulier les pins (le genre Pinus) par une opération que l'on appelle le gemmage.
La colophane est solide et cassante à température ambiante. Sa couleur va du jaune très clair au quasi noir en fonction essentiellement de la conduite de la distillation, la couleur ou grade est défini par une échelle de lettre allant de D pour le plus foncé à X pour le plus clair. La colophane ne fond pas mais se ramollit avec la chaleur, son point de ramollissement se situant autour de 70 °C.
Cette résine a les propriétés de coller et d'imperméabiliser. Elle fait partie des liants utilisés dans les antifoulings.
La colophane est composée à 90% d’un mélange d’acides organiques de la famille des diterpènes appelés acides résiniques, qui répondent à la formule brute C20H30O2. Ces acides résiniques sont des isomères. La proportion des différents acides résiniques dans la colophane est variable suivant l’espèce de pin à partir de laquelle la colophane a été obtenue. Certains acides ne sont présents que chez certaines espèces (et leur sont donc caractéristiques).
La colophane (ou « rosine ») a de nombreux usages. On la trouve notamment dans les peintures antifouling où elle se substitue au tributylétain interdit.
C'est un irritant et un allergisant pour la peau et les voies respiratoires, sous forme pure ou par ses produits de dégradation.
Colorants azoïques
DiamineUne diamine est un type de polyamine contenant exactement deux groupes amine. Les diamines sont principalement utilisées comme monomères pour synthétiser des polyamides, des polyimides et des polyurées. La principale diamine produite est le 1,6-diaminohexane, précurseur du Nylon 6-6, suivie de l'éthylènediamine1. L'hydrazine (H2NNH2) n'est en général pas considérée comme une diamine puisque ce n'est ni une amine (pas de carbone), ni une dibase.
Photopolymères
Polyamide-imide
Polycondensation
Polymères -- Propriétés optiques
Polymères -- Solubilité
Solvants organiquesIndex. décimale : 668.9 Polymères Résumé : New rosin-based photoactive polyamide imides (PAI-a and PAI-b) with a large second-order nonlinear optical coefficient and photo induced were synthesized by the polycondensation of rosin-maleic anhydride adduct (RMA) with azo-dye diamines . Due to the bulky alicyclic structure of the rosin, these polymers were highl y soluble in organic solvents and could easily be processed by spin¬coating into thin films of high optical quality. Fabricated polymer films were very smooth, tough, adhesive to the substrate, and optically clear. Note de contenu : - EXPERIMENTAL : Rosin-maleic anhydride adduct (RMA) - 2-(2-ethyl-[4-(4-nitrophenyazo)phenyl]-aminoethoxy)benzene-1,4diamine (4a) - 2-(2-{ethyl-[4-(4-methylsulfonylphenylazo)phenyl]-amino}ethoxy)benzene-1,4diamine (4b) - 2-(4-methylsulfanylphenyl)isoindole-1,3-dione (2b-1) - 2-(4-methylsulfanylphenyl)isoindole-1,3-dione (2b-2) - 4-methylsulfonylphenylamine (2b-3) - 2-{ethyl-[4-(4-methylsulfonylphenylazo)phenylazo)-phenyl]amino}ethanol (2b) - 2-{4-(1,3-dioxo-2,3-dihydro-1H-2-isoindolyl)-3[2-(ethyl-4-{(E)-2-[4-(methylsulfonyl)phenyl]-1-diazenylanilino)ethoxy]phenyl}-1,3-isoindolinedione (3b) - 2-(2-{ethyl-[4-(4-methylsulfonylphenylazo)-phenyl]amino}ethoxy)benzene-1,4-diamine (4b) - Polymerization (PAI-a - PAI-b) - Characterization - Fabrication of polymer film - SHG measurement - measurement of photoinduced birefringence
- RESULTS AND DISCUSSION : Syntheses of monomers and polymers - Properties of polymersEn ligne : https://drive.google.com/file/d/1i6x05zV4t29qwiQW6qfZpzghsLEO4lcA/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18849
in PAINTINDIA > Vol. LXIII, N° 3 (03/2013) . - p. 61-68[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 15213 - Périodique Bibliothèque principale Documentaires Disponible Thermo-mechanical properties of Uurea-based pattern molding compounds for investment casting / H. Rutto in INTERNATIONAL POLYMER PROCESSING, Vol. XXV, N° 1 (03/2010)
[article]
Titre : Thermo-mechanical properties of Uurea-based pattern molding compounds for investment casting Type de document : texte imprimé Auteurs : H. Rutto, Auteur ; W. W. Focke, Auteur Année de publication : 2010 Article en page(s) : p. 15-22 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Urea is a low cost material with thermal and mechanical properties suitable for use in investment casting pattern molding compounds. Conventional compounds are made by a "cooking" process wherein the urea is added to and dissolved in an aqueous solution of a water soluble polymer followed by evaporation of the water. Here we describe novel formulations based on either polyvinyl alcohol (PVOH) plasticized by glycerol or ethylene vinyl acetate (EVA) resins together with wax that can be prepared by a facile twin-screw compounding process. The thermo-mechanical properties of these compounds were characterized using differential scanning calorimetry (DSC), thermo gravimetric analysis (TGA), dynamic mechanical analysis (DMA) and three bend point tests. The PVOH-based molding compounds featured better mechanical properties than those based on EVA. Increasing the polymer content produced weaker but tougher molding compounds. Increasing wax content improved stiffness but resulted in a loss of toughness. The TG results showed that both compounds decomposed readily at elevated temperatures and left less than 3 wt.% ash at 800°C. DOI : 10.3139/217.2256 En ligne : https://drive.google.com/file/d/1CAPkeqVgLIwL2CngOgTcO7N3q1Wf98c3/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8578
in INTERNATIONAL POLYMER PROCESSING > Vol. XXV, N° 1 (03/2010) . - p. 15-22[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 012006 - Périodique Bibliothèque principale Documentaires Disponible Thermoplastic elastomer nanocomposites based on PA6/NBR / P. Mahallati in INTERNATIONAL POLYMER PROCESSING, Vol. XXV, N° 2 (05/2010)
PermalinkThermoplastic elastomers / V. C. Malshe in PAINTINDIA, Vol. LVIII, N° 11 (11/2008)
PermalinkThermoplastic foams from zein and gelatin / A. Salerno in INTERNATIONAL POLYMER PROCESSING, Vol. XXII, N° 5 (11/2007)
PermalinkThickness uniformity of double bubble tubular film process for producing biaxially oriented PA 6 film / M. Takashige in INTERNATIONAL POLYMER PROCESSING, Vol. XIX, N° 1 (03/2004)
PermalinkThree dimensional analysis of shape deformation in injection molded optical lens / W.-B. Young in INTERNATIONAL POLYMER PROCESSING, Vol. XIX, N° 1 (03/2004)
PermalinkThree-dimensional filling and post-filling simulation of polymer injection molding / F. Ilinca in INTERNATIONAL POLYMER PROCESSING, Vol. XVI, N° 3 (09/2001)
PermalinkThree-dimensional finite element solution of the flow in single and twin-screw extruders / F. Ilinca in INTERNATIONAL POLYMER PROCESSING, Vol. XXV, N° 4 (09/2010)
PermalinkThree-dimensional numerical modeling of co-injection molding / F. Ilinca in INTERNATIONAL POLYMER PROCESSING, Vol. XVII, N° 3 (09/2002)
PermalinkThree-dimensional numerical simulation of segregation in powder injection molding / F. Illinca in INTERNATIONAL POLYMER PROCESSING, Vol. XXIII, N° 2 (05/2008)
PermalinkThree-dimensional numerical study of the mixing behaviour of twin-screw elements / F. Ilinca in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 1 (03/2012)
PermalinkTight tolerance thermoforming / H. Xu in INTERNATIONAL POLYMER PROCESSING, Vol. XVI, N° 2 (06/2001)
PermalinkTip-clearance effect on mixing performance of twin screw extruders / T. Ishikawa in INTERNATIONAL POLYMER PROCESSING, Vol. XXI, N° 4 (09/2006)
PermalinkToughening of polylactide by bio-based and petroleum-based thermoplastic elastomers / Y. Meyva in INTERNATIONAL POLYMER PROCESSING, Vol. XXX, N° 5 (11/2015)
PermalinkTraiter le polyuréthane par les enzymes pour un recyclage efficace / Camille Paschal in INFOCHIMIE MAGAZINE, N° 567 (06/2021)
PermalinkA transient melting model of polymer balls sliding against the barrel / K. L. Yung in INTERNATIONAL POLYMER PROCESSING, Vol. XVI, N° 2 (06/2001)
Permalink