Dépouillements

Strain field measurement on 3D surfaces : application to petaloid base of PET bottles under pressure / L. Chevalier in INTERNATIONAL POLYMER PROCESSING, Vol. XXV, N° 2 (05/2010)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXV, N° 2 (05/2010) . - p. 93-108 Titre : Strain field measurement on 3D surfaces : application to petaloid base of PET bottles under pressure Type de document : texte imprimé Auteurs : L. Chevalier, Auteur ; Y.-M. Luo, Auteur ; E. Monteiro, Auteur ; B. Plantamura, Auteur Année de publication : 2010 Article en page(s) : p. 93-108 Note générale : Appendices - Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Validation of stretched blown bottles of polyethylene terephthalate (PET) by using numerical simulation is an important industrial goal. This necessitates the identification of the PET material characteristics. Because the biaxial elongation of macromolecules induces great modifications of the mechanical properties of the material, it is difficult to manage an accurate simulation: properties are not well known in the base or neck region of the bottles. The aim of the work presented here is to provide an identification tool for the orthotropic elastic properties in the 3D regions of PET bottles of carbonated soft drinks. More specifically, we focus on the behavior of the petaloid bases when bottles are submitted to internal pressure like during burst or ESC (environmental stress cracking) tests. A stereo correlation tool has been developed in order to build digital 3D surface; comparing the initial surface with the same surface when the bottle is under pressure, it is possible to evaluate the membrane strains at each point of the petaloid surface. Two bases, one with large valleys (LV) between the five feet and one with small valleys (SV) which highlight very different behavior at the ESC test, are compared with this tool. Coupled with a finite element simulation managed on the same bases, these results allow the identification of the induced mechanical properties. The LV case presents specific characteristics that are discussed in the last section of the paper. Note de contenu : 1. Introduction : Modeling the stretch blow molding 2. Experimental measurements : Environmental stress cracking (ESC test - Surface construction by stereo correlation - Thickness measurements. 3. Theoretical basics of the identification method : Strain field calculation - Numerical - Experimental comparison. 4. Results and discussion : Elastic properties distribution in petaloid base - Correlation between ESC ans strain field. DOI : 10.3139/217.2327 En ligne : https://drive.google.com/file/d/1B3BV2uRNVQ1oQD08Aq6i82_xPY9UK0ZJ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9323 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
012158	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Warpage of film insert molded parts and optimum processing conditions / S. Y. Kim in INTERNATIONAL POLYMER PROCESSING, Vol. XXV, N° 2 (05/2010)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXV, N° 2 (05/2010) . - p. 109-117 Titre : Warpage of film insert molded parts and optimum processing conditions Type de document : texte imprimé Auteurs : S. Y. Kim, Auteur ; S.-H. Lee, Auteur ; J. R. Youn, Auteur Année de publication : 2010 Article en page(s) : p. 109-117 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Three dimensional flow and structural analyses were carried out for film insert injection molding in order to evaluate the warpage and long term viscoelastic deformation of the film insert molded (FIM) tensile specimen. The predicted warpage after ejection and annealing was utilized as the input to the orthogonal array in order to obtain priority of significant factors and optimum molding conditions. Various injection molding factors influenced the degree of shrinkage of the injected substrate, i.e., packing pressure and mold wall temperature difference determined warpage of the FIM part after ejection. Warpage of the annealed FIM part was affected mainly by heat treatment conditions of the inserted film and annealing time of the part because annealing conditions had larger effects than the other processing factors. Optimum processing conditions and the relative significance of processing factors were obtained for warpage of FIM parts by using the Taguchi's method. Note de contenu : EXPERIMENTAL : Materials and characterization - Film insert injection molding. NUMERICAL SIMULATION : FLow analysis of film insert molding - Viscoelastic stress-strain analysis. TAGUCHI ANALYSIS RESULTS AND DISCUSSION : Warpage after ejection - Wapage after annealing. DOI : 10.3139/217.2269 En ligne : https://drive.google.com/file/d/1vi3eh8JISu5QDzpCy7iI4KIVpLEMoSZi/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9324 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
012158	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Effect of annealing conditions on thermal properties and crystallization behavior of poly(ethylene terephthalate) / M.-Y. Lyu in INTERNATIONAL POLYMER PROCESSING, Vol. XXV, N° 2 (05/2010)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXV, N° 2 (05/2010) . - p. 118-124 Titre : Effect of annealing conditions on thermal properties and crystallization behavior of poly(ethylene terephthalate) Type de document : texte imprimé Auteurs : M.-Y. Lyu, Auteur Année de publication : 2010 Article en page(s) : p. 118-124 Note générale : Bibliogr. Langues : Anglais (eng) Résumé : Thermal properties and crystallization behavior of PET were investigated by controlling the annealing conditions, such as relative humidity, annealing temperature, and annealing time. The variations of moisture content, glass transition temperature (Tg) and cold crystallization temperature (Tcc) were analyzed after annealing the PET specimens. Crystallization processing was performed with annealed PET specimens, and then the degree of crystallinity and the heat distortion temperature (HDT) were examined. Moisture content in the PET specimens increased with increasing the relative humidity, annealing temperature, and annealing time. Tg and Tcc of the annealed PET specimens decreased with increasing moisture content. The degree of crystallinity increased as increasing moisture content in the PET specimens. Although the moisture contents in the specimens after annealing were the same, the degree of crystallinity varied. The degree of crystallinity was affected by residual stress for constant moisture content. The relaxation of residual stress in the PET specimens differed depending on the annealing conditions, and the maximum degree of crystallinity increased with decreasing residual stress in the PET specimens. Note de contenu : EXPERIMENTAL : Material and specimen - Measurement of HDT for crystallized PET - Annealing and analysis of annealed PET specimen - Crystallization and measurement of degree of crystallinity. RESULTS AND DISCUSSION : HDT in crystallized specimens - Moisture content in annealed specimens - 3.3 Tg and Tcc in annealed specimens - Degree of crystallinity according to annealing conditions - Relaxation of residual stress in annealed specimens - Relationship between crystallinity and residual stress. DOI : 10.3139/217.2290 En ligne : https://drive.google.com/file/d/1R0th_7gdYMEyoW1VNORBe1CPOORyjLjl/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9325 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
012158	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Studies of silicon-containing bismaleimide resins – preparation and characteristics of reactive blends of silicon-containing bismaleimide and epoxy / R. S. Tsai in INTERNATIONAL POLYMER PROCESSING, Vol. XXV, N° 2 (05/2010)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXV, N° 2 (05/2010) . - p. 125-131 Titre : Studies of silicon-containing bismaleimide resins – preparation and characteristics of reactive blends of silicon-containing bismaleimide and epoxy Type de document : texte imprimé Auteurs : R. S. Tsai, Auteur ; Z. Y. Wang, Auteur ; W. J. Shu, Auteur Année de publication : 2010 Article en page(s) : p. 125-131 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Three kinds of silicon-containing bismaleimide (4,4′-Bismaleimido phenoxy silane) monomers were synthesized and added through blending to general epoxy system for the study of their applications as reactive flame retardants. The thermal analysis of the BMI monomers in bisphenol type epoxy system had been discussed. An increase in the BMI contents decreased the storage modulus and glass-transition temperature and slightly reduced the mechanical strength of the epoxy blends. Although the initial pyrolysis temperatures of all the blending systems gradually decreased as the silicon-content increased, all the silicon-containing epoxy systems still had good thermal stability and the flame retardancy was promoted significantly by increasing contents of BMI. The LOI values of all the blend types were increased to about 30 as the BMI concentration reached 20%. Note de contenu : Thermal reaction of BMI with a diamine - Curing reaction of the BMI/epoxy/DDS blends / Characteristics of the BMI/epoxy/DDS blends : Dynamic mechanical properties - Mechanical properties - Thermal properties - Flame retardancy. DOI : 10.3139/217.2303 En ligne : https://drive.google.com/file/d/1UAwL7vH1oH2bp-ch4NoFRn4Fl1gg_aYD/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9326 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
012158	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Thermoplastic elastomer nanocomposites based on PA6/NBR / P. Mahallati in INTERNATIONAL POLYMER PROCESSING, Vol. XXV, N° 2 (05/2010)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXV, N° 2 (05/2010) . - p. 132-138 Titre : Thermoplastic elastomer nanocomposites based on PA6/NBR Type de document : texte imprimé Auteurs : P. Mahallati, Auteur ; A. Arefazar, Auteur ; Ghasem Naderi, Auteur Année de publication : 2010 Article en page(s) : p. 132-138 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Elastomères thermoplastiques Matériaux hybrides Index. décimale : 668.9 Polymères Résumé : Thermoplastic elastomer nanocomposites (TPE nanocomposites) based on PA6/ NBR/Cloisite 30B were prepared through a direct melt mixing process in an internal mixer. The effects of NBR content (10, 30 and 50 wt.%) and nanoclay loading (3, 5 and 7 wt.%) on morphology and mechanical properties of the nanocomposites have been studied and compared with unfilled PA6/NBR blends as well. The TPE nanocomposites were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), differential scanning calorimeter (DSC) and mechanical properties. XRD results suggested that the nanoclay is exfoliated into the TPE nanocomposite matrix. TEM image of the PA6/NBR/nanoclay composite showed partial exfoliated structure of silicate layers dispersed through the both NBR and PA6 phases. The SEM photomicrograph of PA6/NBR nanocomposite showed an increasing of the rubber particles size in comparison with unfilled PA6/NBR TPE. By presence of nanoclay, improved modulus of the prepared TPE nanocomposites was achieved. DSC studies showed that loading of the nanoclay reduced the degree of crystallinity of the nanocomposite samples. DOI : 10.3139/217.2311 En ligne : https://drive.google.com/file/d/1-jZKwbuIsJX_XeCDe7vHbHq2fRohLz_u/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9327 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
012158	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Optimization of short glass fiber and PTFE reinforced PC composites using D-optimal mixture design / J.-C. Lin in INTERNATIONAL POLYMER PROCESSING, Vol. XXV, N° 2 (05/2010)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXV, N° 2 (05/2010) . - p. 139-148 Titre : Optimization of short glass fiber and PTFE reinforced PC composites using D-optimal mixture design Type de document : texte imprimé Auteurs : J.-C. Lin, Auteur Année de publication : 2010 Article en page(s) : p. 139-148 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.4 Plastiques, vinyles Résumé : This paper deals with the application of D-optimal mixture design (DMD) integrating response surface methodology (RSM) to discuss the variation of tribological behaviors and impact energy depending on injection molding techniques during production of short glass fiber (SGF) and polytetrafluoroethylene (PTFE) reinforced polycarbonate (PC) composites. Planning of experiments was based on a D-optimal mixture design (DMD). By applying RSM analysis, a mathematical predictive model of the friction coefficient, wear mass loss and impact energy was developed in terms of the mixture ratio of PC, SGF, and PTFE. In addition, analysis of variance (ANOVA) was also applied to identify the significant effect of mixture ratio of SGF and PTFE reinforced PC composites for the friction coefficient, wear mass loss and impact energy. Note de contenu : DESIGN OF EXPERIMENTAL METHOD : D-optimal mixture design (DMD) - Response surface methodology (RSM). EXPERIMENTAL SETUPS : Material - Schematic of specimen - Experimental design. TESTING APPARATUS : Tribological behaviors testing apparatus - Impact energy tests - Field-emission scanning electron microscope (FE-SEM) apparatus. RESULTS AND DISCUSSION : Wear mechanisms - ANOVA results - Mixture ration influence on the tribological behaviors and impact energy - Mathematical predictive models developed - Mathematical predictive models adequacy check - Optimal search. DOI : 10.3139/217.2315 En ligne : https://drive.google.com/file/d/11Ix47L4uXQgp7w9nYZ1KCjKSrALeuu9X/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9328 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
012158	-	Périodique	Bibliothèque principale	Documentaires	Disponible

A disposable bioreactor for culturing and testing of tissue-engineered heart valves / P. E. Neerincx in INTERNATIONAL POLYMER PROCESSING, Vol. XXV, N° 2 (05/2010)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXV, N° 2 (05/2010) . - p. 149-158 Titre : A disposable bioreactor for culturing and testing of tissue-engineered heart valves Type de document : texte imprimé Auteurs : P. E. Neerincx, Auteur ; Han E. H. Meijer, Auteur Année de publication : 2010 Article en page(s) : p. 149-158 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : A disposable bioreactor is designed consisting out two identical shells that are fabricated via a two component, hard and soft, injection molding technique. In the bioreactor an autologous-cell-seeded scaffold can be placed for culturing (growing and conditioning) and testing tissue-engineered heart valves. The soft polymer is used for membranes, that drive the fluid flow, and for the steering valves and the sealings. The hard polymer comprises the casing parts that hold the soft parts in place. The steering valves are used for directing the fluid flow and controlling the closing pressure exerted on the growing heart valve. Air pressure actuation is used because of its flexibility, simplicity and reliability. Different spherical membrane geometries are evaluated in their performance to realize a reproducible deformation. Relaxation of flow-induced orientation inside the membrane results in buckling and tilting, which makes ultrasonic position measuring troublesome. The problem is solved by developing a membrane geometry that allows high volume displacements combined with relaxation to a neutral geometry as it is initially molded. The bioreactor is successfully tested, imitating the cardiac pressures and cardiac flows needed during the culturing and testing of tissue-engineered heart valves. Note de contenu : The concept phase / A prototype bioreactor / An injection molded bioreactor / Membrane optimization. DOI : 10.3139/217.2323 En ligne : https://drive.google.com/file/d/1raioIqOgTix9kkV3H5PtYewSla7qqP_R/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9329 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
012158	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Effect of the control of polymer flow in the vicinity of spinning nozzle on mechanical properties of poly(ethylene terephthalate) fibers / M. Masuda in INTERNATIONAL POLYMER PROCESSING, Vol. XXV, N° 2 (05/2010)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXV, N° 2 (05/2010) . - p. 159-169 Titre : Effect of the control of polymer flow in the vicinity of spinning nozzle on mechanical properties of poly(ethylene terephthalate) fibers Type de document : texte imprimé Auteurs : M. Masuda, Auteur ; W. Takarada, Auteur ; Takeshi Kikutani, Auteur Année de publication : 2010 Article en page(s) : p. 159-169 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : In the melt spinning of PET, effects of the variation of flow behavior in the vicinity of spinning nozzle on the mechanical properties of as-spun fibers and drawn fibers were investigated. The variation of flow behavior was introduced by the change of spinning nozzle diameter and by the irradiation of CO2 laser to the spin-line at a position immediately below the spinneret. The curve representing the correlation between strength and elongation at break of as-spun fibers shifted toward the upper-right direction by the applications of small diameter nozzle and laser irradiation, indicating that the toughness of as-spun fibers was improved. The two-stage continuous drawing of as-spun fibers with various draw ratios revealed that the correlation between strength and elongation of drawn fibers also shifted toward the upper-right direction by the application of small diameter nozzle and laser irradiation. In other words, improved toughness in the as-spun fibers was preserved in the drawn fibers. Accordingly, by the drawing of the as-spun fibers prepared by the combination of small-diameter nozzle and laser irradiation, high-strength and high-toughness PET fibers with the tensile strength of 1.68 GPa (12.1 cN/dtex) and the elongation at break of 9.1% was obtained. Numerical simulation of the melt spinning process incorporating the effects of nozzle diameter variation and laser irradiation heating indicated that the maximum Deborah number in the spin-line decreased by the applications of small diameter nozzle and laser irradiation heating. Accordingly, it was speculated that the variation of the state of molecular entanglement caused by the difference of polymer flow in the melt spinning process has significant effect on the mechanical properties of resultant fibers. Note de contenu : EXPERIMENTAL : Melt spinning process - Measurement of fiber properties - Numerical simulation of the melt spinning process. RESULTS AND DISCUSSION : Structures and properties of as-spun fibers - Structure and properties of drawn fibers DOI : 10.3139/217.2330 En ligne : https://drive.google.com/file/d/16NB9uhQcItcg_weSFL4mE3JCiNRK28aa/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9330 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
012158	-	Périodique	Bibliothèque principale	Documentaires	Disponible