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INTERNATIONAL POLYMER PROCESSING / Polymer Processing Society . Vol. XXX, N° 3Mention de date : 07/2015Paru le : 30/06/2015 |
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Ajouter le résultat dans votre panierAnti-aging performance of cardanol grafted onto polypropylene by reactive extrusion / J.-R. Lin in INTERNATIONAL POLYMER PROCESSING, Vol. XXX, N° 3 (07/2015)
[article]
Titre : Anti-aging performance of cardanol grafted onto polypropylene by reactive extrusion Type de document : texte imprimé Auteurs : J.-R. Lin, Auteur ; J.-H. Lin, Auteur ; Q.-H. Chen, Auteur Année de publication : 2015 Article en page(s) : p. 310-316 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Allongement à la rupture
Cardanol
Copolymères -- Propriétés mécaniques
Copolymères greffés
Elasticité
Extrusion réactive
Polypropylène
Résistance à la rupture
Résistance des matériauxIndex. décimale : 668.4 Plastiques, vinyles Résumé : The cardanol grafted onto polypropylene (CAPP) was prepared by reactive extrusion with polypropylene (PP) and natural renewable cardanol, which could improve the inherent defects of PP such as chemical inertness and hydrophobicity. Moreover, the cardanol grafted onto PP could resolve the degradation of PP during the process of reactive extrusion, storage and application. In this paper, the yield strength, tensile strength, elongation at break of modified and unmodified PPs were tested during the aging process. A possible aging mechanim of PP and anti-aging mechanism of cardanol grafted onto PP were proposed. Results showed that the initiator dicumyl peroxide caused the degradation of PP chains during the aging processing. After being aged for 24 h, the yield strength CAPP0 decreased from 28 MPa to 15 MPa and the elongation at break reduced by 795%. CAPPs possessed outstanding anti-aging performance owing to the cross-linking and entanglement of the side chains of cardanol grafted onto PP. The yield strength, tensile strength and the elongation at break of CAPP5 changed lightly even when it was in long-term irradiation for 480 h. The CAPPs had better anti-aging properties than the mixture of PP and 5% of cardanol. CAPP containing 3% of cardanol could effectively prevent the degradation of the main chain polypropylene. Note de contenu : - EXPERIMENTAL : Materials - Preparation of cardanol grafted onto polypropylene (CAPP) - Mechanical properties testing
- RESULTS AND DISCUSSION : Yield strength of cardanol grafted onto polypropylene (CAPP) - Tensile strength of cardanol grafted onto polypropylene (CAPP) - Elongation at break of CAPP - Deduction of aging mechanism - Comparison of aging performance of CAPPs with CAPPm - The effect of cardanol concentration on anti-ageing properties of CAPPsDOI : 10.3139/217.2944 En ligne : https://drive.google.com/file/d/1wZfxne7fYnTZfwfaVmr_nyFDB3gT4KA7/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24325
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Code-barres Cote Support Localisation Section Disponibilité 17309 - Périodique Bibliothèque principale Documentaires Disponible Co-extrusion layer multiplication of rheologically mismatched polymers : a novel processing route / R. Huang in INTERNATIONAL POLYMER PROCESSING, Vol. XXX, N° 3 (07/2015)
[article]
Titre : Co-extrusion layer multiplication of rheologically mismatched polymers : a novel processing route Type de document : texte imprimé Auteurs : R. Huang, Auteur ; J. Silva, Auteur ; B. A. Huntington, Auteur ; J. Patz, Auteur ; R. Andrade, Auteur ; P. J. Harris, Auteur ; K. Yin, Auteur ; M. Cox, Auteur ; Roger T. Bonnecaze, Auteur ; Joao M. Maia, Auteur Année de publication : 2015 Article en page(s) : p. 317-330 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Eléments finis, Méthode des
Matières plastiques -- Extrusion:Polymères -- Extrusion
Polyméthacrylate de méthyleLe poly(méthacrylate de méthyle) (souvent abrégé en PMMA, de l'anglais Poly(methyl methacrylate)) est un polymère thermoplastique transparent obtenu par polyaddition dont le monomère est le méthacrylate de méthyle (MMA). Ce polymère est plus connu sous son premier nom commercial de Plexiglas (nom déposé), même si le leader global du PMMA est Altuglas International9 du groupe Arkema, sous le nom commercial Altuglas. Il est également vendu sous les noms commerciaux Lucite, Crystalite, Perspex ou Nudec.
Polystyrène
Polyuréthanes
Rhéologie
Simulation, Méthode de
Stratifiés
Structures multicouches
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 : Co-extruded films with up to 65 layers of two rheologically mismatched polymer systems – polystyrene/poly(methylmethacrylate) (PS/PMMA) and hard/soft thermoplastic polyurethanes (TPUs) – were successfully produced using a combination of a 9-layer feedblock, low-pressure drop multiplier dies, and external lubricants. Formation of viscoelastic instabilities was studied using a custom visualization and by finite element method (FEM) simulations of a standard multiplier. The results showed that the flow inside the standard multiplier die is highly non-uniform, with severe gradients in shear and normal stresses and viscous encapsulation occurring mainly in the initial multiplication stages where there is enough material available in the low-viscosity layers to proceed with the encapsulation. To mitigate layer degradation the standard 2- or 3-layer feedblock was replaced with a 9-layer one, thereby decreasing the thickness of each layer at the end of the feedblock. Also, subsequent layering was performed using a low flow resistance die. This new multiplier die yields a more uniform flow profile and imparts a more homogeneous thermo-mechanical history on the melt which results in an improved layer stability. Simulations showed that in the standard die the second normal-stress difference (N2) responsible for elastic instabilities at the edges of the die are very high. These can be reduced by inducing slip at the wall resulting in be much improved layer uniformity and stability. This was accomplished experimentally via the use of external lubricants, and the resulting layered structure was indeed much better than was possible to achieve with the conventional multiplier dies. Note de contenu : - EXPERIMENTAL METHOD : Materials - Rheological measurements - Rheological results - Simulation method - Co-extrusion system and conditions - 9-layer feedblock and the second generation multiplier die
- RESULTS AND DISCUSSION : Visualization of layered structure - The standard die - Engineering solution : 9-layer feedblock and the second generation multiplier die - Reduction of N2 : The effect of external lubricantDOI : 10.3139/217.2955 En ligne : https://drive.google.com/file/d/16YwA6JWwep2d5SI2y2bXF97rG4nBEm5y/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24326
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Code-barres Cote Support Localisation Section Disponibilité 17309 - Périodique Bibliothèque principale Documentaires Disponible Synthesis and characterization of acrylated epoxidized flaxseed oil for biopolymeric applications / Anup Rana in INTERNATIONAL POLYMER PROCESSING, Vol. XXX, N° 3 (07/2015)
[article]
Titre : Synthesis and characterization of acrylated epoxidized flaxseed oil for biopolymeric applications Type de document : texte imprimé Auteurs : Anup Rana, Auteur ; R. W. Ewitts, Auteur Année de publication : 2015 Article en page(s) : p. 331-336 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acrylation
Biopolymères
Caractérisation
Composés organiques -- Synthèse
Epoxydation
Huile de linL'huile de lin ou "huile de graines de lin" est une huile de couleur jaune d'or, tirée des graines mûres du lin cultivé, pressées à froid et/ou à chaud ; parfois elle est extraite par un solvant, en vue de l'usage industriel ou artistique, principalement comme siccatif, ou huile auto-siccative.
Les utilisations de l'huile de lin dérivent de sa richesse en acides gras polyinsaturés, en particulier en acides linolénique et linoléique, qui lui doivent leur nom.
L'huile de lin polymérise spontanément à l'air, avec une réaction exothermique : un chiffon imbibé d'huile peut ainsi, dans certaines conditions, s'enflammer spontanément.
Pour ses propriétés de polymère, l'huile de lin est employée seule, ou mélangée à d'autres huiles, résines et solvants, et est utilisée en tant que : Imprégnateur et protecteur des bois à l'intérieur comme à l'extérieur : protection contre l'humidité, les champignons et insectes, et contre la poussière par son caractère antistatique, composant de certains vernis de finition, liant de broyage pour la peinture à l'huile, agent plastifiant du mastic de vitrier, agent durcisseur de diverses préparations, agent de cohérence et liant dans la fabrication du linoléum.Index. décimale : 668.9 Polymères Résumé : In this study acrylated epoxidized flaxseed oil was synthesized and then characterized by spectroscopic techniques. Triglycerides are the main constituents of flaxseed oil and the carbon-carbon double bond is the reaction site for epoxidation. Flaxseed oil was epoxidized by adding formic acid and hydrogen peroxide. Acrylic acid was then added to produce acrylated epoxidized flaxseed oil (AEFO). The change in the structure of the fatty acids chain after the epoxidation and acrylation reactions was measured and characterized by Hydrogen nuclear magnetic resonance spectroscopy (1H NMR) and Fourier transform infrared spectroscopy (FTIR). The FTIR spectra of epoxidized flaxseed oil and flaxseed oil shows the disappearance of the =C–H (3012 cm?1) and C=C (1654 cm?1) peaks. The FTIR spectra confirmed the formation of AEFO since the presence of hydroxyl group (–OH) was shown by the peak at 3455 cm?1 and the acrylate group (–CH=CH2), which was indicated by the peaks at 1406, 984 and 812 cm?1. The changes in peaks of the 1H NMR spectra also confirmed the formation of AEFO. The number of acrylate groups/molecule of triglyceride was found to be 2.6 from 1H NMR spectra. Note de contenu : - EXPERIMENTAL : Materials - Characterization techniques - Synthesis of acrylated epoxidized flaxseed oil
- RESULTS AND DISCUSSION : FTIR analysis of epoxidized flaxseed oil and acrylated epoxidized flaxseed oil - H NMR analysis of epoxidized flaxseed oil and acrylated epoxidized flaxseed oilDOI : 10.3139/217.2961 En ligne : https://drive.google.com/file/d/1xZSqHKlbEgXSWLM-yu8mn70sH7X9W08g/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24327
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Code-barres Cote Support Localisation Section Disponibilité 17309 - Périodique Bibliothèque principale Documentaires Disponible Processing of soju industrial bioresidue to extract microcrystalline cellulose and characterization / A. Naidu Bhima in INTERNATIONAL POLYMER PROCESSING, Vol. XXX, N° 3 (07/2015)
[article]
Titre : Processing of soju industrial bioresidue to extract microcrystalline cellulose and characterization Type de document : texte imprimé Auteurs : A. Naidu Bhima, Auteur ; J.-H. Park, Auteur ; M. Cho, Auteur ; S.-G. Oh, Auteur ; H. Hyung, Auteur ; S. Kamala-Kannan, Auteur ; Byung-Taek Oh, Auteur Année de publication : 2015 Article en page(s) : p. 331-336 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Biomasse
Biopolymères
CelluloseLa cellulose est un glucide constitué d'une chaîne linéaire de molécules de D-Glucose (entre 200 et 14 000) et principal constituant des végétaux et en particulier de la paroi de leurs cellules.
Chimie analytique
Déchets végétaux -- Recyclage
Extraction (chimie)
HydrolyseIndex. décimale : 668.9 Polymères Résumé : Soju industrial biomass residue (SIBR) is a lignocellulosic agro-industrial biowaste available in large quantities in soju producing countries. In this study, an attempt was made to extract microcrystalline cellulose (MCC), a biopolymer from SIBR by controlled acid hydrolysis. X-ray diffraction analysis indicated the presence of cellulose I structure with two peaks around 2? = 15 and 22.5° and increase in crystallinity after acid hydrolysis treatment. Fourier transform infrared analysis showed no significant chemical affect of the cellulose fragment. Thermo-gravimetric analysis reveals that the extracted MCC have a good thermal stability (319°C). Dynamic light scattering studies confirmed the presence of MCC in micro range (126.4 nm) which was supported by transmission electron microscopy. The results of this work are useful for extracting valuable and widely applicable cellulose, and help solve management of SIBR in terms of disposal and pollution problems. Note de contenu : - EXPERIMENTAL METHODS : Materials - Microcrystalline cellulose extraction - Characterization of MCCs
- RESULTS AND DISCUSSION : Effect of chemical processing on SIBR - Morphological analysis - FTIR - Crystalline structure analysis - TGA and DTG analysisDOI : 10.3139/217.2996 En ligne : https://drive.google.com/file/d/1Z-xeeoWZQU05YlEveBktIFGJMgW1n71f/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24328
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Code-barres Cote Support Localisation Section Disponibilité 17309 - Périodique Bibliothèque principale Documentaires Disponible Competition between a and b crystallization in isotactic polypropylene : effect of nucleating agents composition / S.-W. Wang in INTERNATIONAL POLYMER PROCESSING, Vol. XXX, N° 3 (07/2015)
[article]
Titre : Competition between a and b crystallization in isotactic polypropylene : effect of nucleating agents composition Type de document : texte imprimé Auteurs : S.-W. Wang, Auteur ; Y. T. Leng, Auteur ; J. Jiang, Auteur ; G.-Q. Zheng, Auteur ; Q. Li, Auteur Année de publication : 2015 Article en page(s) : p. 344-349 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cristallisation
Nucléation
Polymères -- Propriétés mécaniques
Polymères isotactiques
Polypropylène
RhéologieIndex. décimale : 668.9 Polymères Résumé : Based on the different nucleation ability, different contents and proportions of the mixed nucleating agents were melt compounded with pure isotactic polypropylene resins employed in this work, selective ? nucleating agent was a compound of pimelic acid and calcium stearate, the ? nucleating agent was a type of dibenzylidene sorbitol derivative. The competition attributed to the different type of interactions between a nucleating agent and isotactic polypropylene molecular chains during crystallization was investigated in this research. For a low content of the mixed nucleating agents used, ? nucleation dominated the crystallization behavior of isotactic polypropylene, while with an increase of the content of the mixed nucleating agents, the situation was reversed and ? nucleation became dominant. In the ? dominated region, both of the molecular chain and segmental motions were various with different nucleating agent proportion. Thus, the content and proportion of the components of the nucleating agents were the critical factors in the competition during crystallization. Note de contenu : - Material
- Sample preparation
- Mechanical properties
- Differential scanning calorimetry
- Wide angle X-ray diffraction
- Dynamic rheological analysisDOI : 10.3139/217.3023 En ligne : https://drive.google.com/file/d/1vFky-tZGOnQ3fR-OKDD9ObcWFnGhsGc3/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24329
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Code-barres Cote Support Localisation Section Disponibilité 17309 - Périodique Bibliothèque principale Documentaires Disponible Thermal and flexural properties and water absorption of caulis spatholobi residue fiber reinforced biodegradable poly(propylene carbonate) composites / W. Li in INTERNATIONAL POLYMER PROCESSING, Vol. XXX, N° 3 (07/2015)
[article]
Titre : Thermal and flexural properties and water absorption of caulis spatholobi residue fiber reinforced biodegradable poly(propylene carbonate) composites Type de document : texte imprimé Auteurs : W. Li, Auteur ; F.-Q. Chen, Auteur ; X.-C. Yin, Auteur ; J.-P. Qu, Auteur ; M. Yan, Auteur Année de publication : 2015 Article en page(s) : p. 350-358 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Composites à fibres végétales -- Propriétés mécaniques
Composites à fibres végétales -- Propriétés thermiques
Flexion (mécanique)
Humidité -- Absorption:Eau -- Absorption
Polycarbonate de propylèneLe carbonate de polypropylène (PPC), un copolymère d'anhydride carbonique et d'oxyde de propylène, est un thermoplastique. Des catalyseurs tels que le glutarate de zinc sont utilisés dans sa polymérisation.Index. décimale : 668.9 Polymères Résumé : This paper investigated and compared the thermal and flexural properties and water absorption of natural caulis spatholobi residue fibers reinforced PPC/CSRF composites. Polypropylene carbonate (PPC) was reinforced by caulis spatholobi residue fibers (CSRF) which had been pretreated by continuous steam explosion. The effect of fiber content (10 to 60 wt%) on the properties and water absorption of PPC/CSRF biodegradable composites was investigated. The thermal properties of PPC/CSRF composites indicated that the addition of CSRF could improve the thermal stability of the composites. The flexural strength and modulus of the composites were found to be improved as the content of fiber increased. From the SEM micrographs, it was found that a small amount of fibers were pulled out on fractured surfaces of the composites, showing good network structure between the fiber and PPC matrix. The water absorption amount of the composites increased with increasing the fiber content. This paper demonstrates that the incorporation of low-cost and biodegradable caulis spatholobi residue fiber into PPC provides a practical way to produce completely biodegradable and cost-competitive composites with good mechanical properties. Note de contenu : - EXPERIMENTAL : Materials - Continuous steam explosion of caulis spatholobi residue - Preparation of PPC/CSFR composites - Differential scanning calorimetry (DSC) - Thermogravimetric analysis (TGA) - Dynamic mechanical analysis (DMA) - Mechanical testing - Morphology observation - Water absorption
- RESULTS AND DISCUSSION : Dynamic mechanical properties analysis - Flexural properties analysis - Morphology - Water absorptionDOI : 10.3139/217.3027 En ligne : https://drive.google.com/file/d/1tM6B3wNxtXe8wjalRvRq-PJFqKi1rJOg/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24330
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Code-barres Cote Support Localisation Section Disponibilité 17309 - Périodique Bibliothèque principale Documentaires Disponible The mechanical properties of plasticized PVC processed in an extruder with a modified feed zone / Janusz W. Sikora in INTERNATIONAL POLYMER PROCESSING, Vol. XXX, N° 3 (07/2015)
[article]
Titre : The mechanical properties of plasticized PVC processed in an extruder with a modified feed zone Type de document : texte imprimé Auteurs : Janusz W. Sikora, Auteur ; B. Samujlo, Auteur ; A. Stasiek, Auteur ; A. Tor-Swiatek, Auteur Année de publication : 2015 Article en page(s) : p. 359-365 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chlorure de polyvinyle
Extrudeuse monovis
Matières plastiques -- Extrusion:Polymères -- Extrusion
Matières plastiques -- Propriétés mécaniques
PlastifiantsIndex. décimale : 668.9 Polymères Résumé : The work presents the results of experimental studies of selected mechanical properties of plasticized poly(vinyl chloride) extruded by a single-screw extruder with a modified feed section. The variable factors were: feed opening width, feed pocket depth in the extruder barrel and the rotational speed of the screw. The following parameters were studied: yield strength ReH (MPa), tensile strength Rm (MPa), percentage total extension at maximum force ?m (%), Shore hardness H (°ShA). It was found that the increase in the depth of the pocket and the decrease in the width of the feed opening in the studied range increase mechanical properties (besides percentage total extension at maximum force). It was determined that the increase of the screw speed and the simultaneous displacement of both the axis and edge of the feed opening in relation to the plasticizing system axis towards the direction of revolutions of the screw is favorable. DOI : 10.3139/217.3040 En ligne : https://drive.google.com/file/d/18wkwsFGgdV7X8lI-dXqTcJ2orsvgbLFO/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24331
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Code-barres Cote Support Localisation Section Disponibilité 17309 - Périodique Bibliothèque principale Documentaires Disponible Prediction and validation of short fiber orientation in a complex injection molded part with Chunky geometry / Stefan Kleindel in INTERNATIONAL POLYMER PROCESSING, Vol. XXX, N° 3 (07/2015)
[article]
Titre : Prediction and validation of short fiber orientation in a complex injection molded part with Chunky geometry Type de document : texte imprimé Auteurs : Stefan Kleindel, Auteur ; D. Salaberger, Auteur ; R. Eder, Auteur ; H. Schretter, Auteur ; C. Hochenauer, Auteur Année de publication : 2015 Article en page(s) : p. 366-380 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Composites à fibres -- Moulage par injection
Composites à fibres courtes
Distribution et orientation des fibres
Prévision, Théorie de la
RhéologieIndex. décimale : 668.4 Plastiques, vinyles Résumé : The paper shows the capability of state-of-the-art models and software to predict the fiber orientation distribution (FOD) on injection molded parts with a complex and thick-walled geometry. Predictions by the standard Folgar-Tucker model and the Reduced Strain Closure model were compared to measurements of the fiber orientation distribution obtained by X-ray Computed Tomography. Measurements and simulations were performed under different processing conditions to investigate the influence of injection velocity and packing pressure on the FOD. It was found that the predicted fiber orientation is in good qualitative agreement with the measurements. The measured orientation shows a distinct shell-core structure with high alignment of the fibers in flow direction in the shell layer and a orientation perpendicular to the flow direction in the core layer. While the orientation in the shell layer is predicted fairly well, a significant deviation is found in the prediction of the orientation in the core layer. Note de contenu : - MEASUREMENTS
- EXPERIMENTAL
- NUMERICAL : Computational mesh - Material data - Fiber orientation - Solver settings
- RESULTS : Influence of the processing conditions on the fiber orientation - Results of the fiber orientation prediction
- DISCUSSION : The mesh - Solver settings - Boundary condition for the fiber orientation - Rheological model - Suggestions for further investigationsDOI : 10.3139/217.3047 En ligne : https://drive.google.com/file/d/1N1uretG0XwJdlIfK-nUmpBC-VUCobfhP/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24332
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Code-barres Cote Support Localisation Section Disponibilité 17309 - Périodique Bibliothèque principale Documentaires Disponible Microthermoforming integrated in the injection molding process for fabrication of film-based microstructured parts / Ariane Jungmeier in INTERNATIONAL POLYMER PROCESSING, Vol. XXX, N° 3 (07/2015)
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Titre : Microthermoforming integrated in the injection molding process for fabrication of film-based microstructured parts Type de document : texte imprimé Auteurs : Ariane Jungmeier, Auteur ; Dietmar Drummer , Auteur Année de publication : 2015 Article en page(s) : p. 381-389 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Films plastiques
Matières plastiques -- Micro-thermoformage
Matières plastiques -- Moulage par injection
MicrostructuresIndex. décimale : 668.4 Plastiques, vinyles Résumé : Thermoplastic micro parts are commonly manufactured by the large-scale production technology of micro injection molding, with small wall thicknesses limiting the feasible flow length. In contrast, microthermoforming is an inexpensive technology to manufacture thin-walled microstructured parts, but connecting three-dimensional solid bodies, e.g. functional structures, is impossible. The novel combination of processing techniques, i.e. microthermoforming integrated in the injection molding process with dynamic mold temperature control enables the use of non-adhesive polymer melt to form thermoplastic films via back molding and employ adhesive melt to connect further structures. Additional heating the film with the back molding component represents a particular benefit in terms of reaching the required film temperature and leads to low temperatures prevailing in the mold. Simulative tools facilitate the understanding of film temperatures after back molding and can be used in a further step for the adaption of homogenous temperature distributions across a really distributed microstructures. Generally speaking, the technology is expected to allow for multifunctional, thin-walled microstructured parts produced in short cycle times. Note de contenu : - MICROTHERMOFORMING - STATE OF THE ART
- INVESTIGATIONS AND METHODS OF ANALYSIS : Characteristics of the film - Processing - Simulation of mold and film temperature - Methods of analyses
- RESULTS AND DISCUSSION : Elongational, rheological behavior of the PC film - Temperature behavior of the mold and film - Forming investigationsDOI : 10.3139/217.3055 En ligne : https://drive.google.com/file/d/1iouDuUNeFKxTlBrAC3SbsT8sXgQjprFy/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24333
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Code-barres Cote Support Localisation Section Disponibilité 17309 - Périodique Bibliothèque principale Documentaires Disponible Modification induced in light diffusing polycarbonate due to proton irradiation / Samir A. Nouh in INTERNATIONAL POLYMER PROCESSING, Vol. XXX, N° 3 (07/2015)
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Titre : Modification induced in light diffusing polycarbonate due to proton irradiation Type de document : texte imprimé Auteurs : Samir A. Nouh, Auteur ; S. K. Alghamdi, Auteur ; B. O. Alsobhi, Auteur ; K. Benthami, Auteur ; N. T. El-Shamy, Auteur Année de publication : 2015 Article en page(s) : p. 390-396 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorimétrie
Irradiation
Polycarbonates
Protons
Réfraction, Indice deIndex. décimale : 668.4 Plastiques, vinyles Résumé : Light diffusing polycarbonate samples were exposed to protons fluences at levels between 1011 and 1016 p/cm2. The variation of the refractive index and color intensity with the proton fluence has been studied. The results show that the polycarbonate samples acquire color changes under proton irradiation. Furthermore, thermogravimetric analysis has been performed. It was found that both the onset temperature and activation energy of thermal decomposition are affected by the proton fluencies owing to the degradation and crosslinking processes. Moreover, structural property studies using X-ray diffraction, intrinsic viscosity and Fourier transform infrared spectroscopy were performed. Note de contenu : - EXPERIMENTAL : Samples - Irradiation facilities - Analysis of the irradiated samples
- RESULTS AND DISCUSSION : Optical properties - Thermo-gravimetric analysis - Structural propertiesDOI : 10.3139/217.3054 En ligne : https://drive.google.com/file/d/10x7HUfJ0F2p10xFaeBUgxaUQnRBwjxKx/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24334
in INTERNATIONAL POLYMER PROCESSING > Vol. XXX, N° 3 (07/2015) . - p. 390-396[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 17309 - Périodique Bibliothèque principale Documentaires Disponible Surface quenching induced microstructure transformations in extrusion foaming of porous sheets / A. Gandhi in INTERNATIONAL POLYMER PROCESSING, Vol. XXX, N° 3 (07/2015)
[article]
Titre : Surface quenching induced microstructure transformations in extrusion foaming of porous sheets Type de document : texte imprimé Auteurs : A. Gandhi, Auteur ; Naresh Bhatnagar, Auteur Année de publication : 2015 Article en page(s) : p. 397-402 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation
Matières plastiques -- Refroidissement
Morphologie (matériaux)
Mousses plastiques -- Extrusion
Polymères -- Surfaces
Surfaces (technologie)Index. décimale : 668.4 Plastiques, vinyles Résumé : In this article, a new technology is described to manufacture open cell thermoplastic foamed sheets with the aid of surface-quenching phenomenon during an extrusion process. As the gas laden polymer extrudate exits the slit die, its surface is rapidly quenched which results in freezing of cells on the surface, while the cells at the core continue to grow and leads to development of open-cellular microstructure at the core. Influence of chill roll temperature was found to be extremely significant in developing porous morphological attributes. Subsequently, synergistic effect of physical blowing agent (N2) content and chill roll temperature was examined for their expansion ratio and foam thickness. Fascinatingly, with reduced chill roll temperatures open-cell microstructure and high expansion ratio was obtained although its thickness was observed to decrease. Further, influence of chill roll rotating speed on foam microstructure and expansion ratio was studied. Lower chill roll rotational speed resulted in development of open-cellular microstructure; while at higher speeds, closed cell morphology was obtained. The results coherently demonstrate that by controlling the chill roll temperatures ; open-cellular microstructure can be developed in sheet extrusion foaming process. Note de contenu : - EXPERIMENTAL : Materials - Foaming methodology - Foam characterization
- RESULTS AND DISCUSSIONS : Influence of surface quenching on foam morphology - Synergistic effect of blowing agent content and surface quenching on open cell microstructure development - Influence of chill roll rotational speed on open cell microstructure developmentDOI : 10.3139/217.3057 En ligne : https://drive.google.com/file/d/1ZdtFspE921BkZifuo1NnEHi5DBDGXFFX/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24335
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Code-barres Cote Support Localisation Section Disponibilité 17309 - Périodique Bibliothèque principale Documentaires Disponible Repercussion of cenosphere filler size on mechanical and dry sliding wear peculiarity of glass fiber-reinforced polyester composites using Taguchi analysis and neural network / Akant Kumar Singh in INTERNATIONAL POLYMER PROCESSING, Vol. XXX, N° 3 (07/2015)
[article]
Titre : Repercussion of cenosphere filler size on mechanical and dry sliding wear peculiarity of glass fiber-reinforced polyester composites using Taguchi analysis and neural network Type de document : texte imprimé Auteurs : Akant Kumar Singh, Auteur Année de publication : 2015 Article en page(s) : p. 403-421 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse de variance En statistique, l'analyse de la variance (terme souvent abrégé par le terme anglais ANOVA : ANalysis Of VAriance) est un ensemble de modèles statistiques utilisés pour vérifier si les moyennes des groupes proviennent d'une même population. Les groupes correspondent aux modalités d'une variable qualitative (p. ex. variable : traitement; modalités : programme d'entrainement sportif, suppléments alimentaires ; placebo) et les moyennes sont calculés à partir d'une variable continue (p. ex. gain musculaire).
Ce test s'applique lorsque l'on mesure une ou plusieurs variables explicatives catégorielles (appelées alors facteurs de variabilité, leurs différentes modalités étant parfois appelées "niveaux") qui ont de l'influence sur la loi d'une variable continue à expliquer. On parle d'analyse à un facteur lorsque l'analyse porte sur un modèle décrit par un seul facteur de variabilité, d'analyse à deux facteurs ou d'analyse multifactorielle sinon. (Wikipedia)
Cénosphères
Charges (matériaux)
Composites à fibres de verre
Composites à fibres de verre -- Propriétés mécaniques
Plan d'expérience
Polyesters
Réseaux neuronaux (informatique)
Taguchi, Méthodes de (Contrôle de qualité)
Tribologie (technologie)Index. décimale : 668.4 Plastiques, vinyles Résumé : Filler plays a significant role in determining the properties and behavior of particulate composites. In this experimental study, mechanical and tribological behaviors of sub-micron size cenospheres filled glass-polyester composites are investigated. Cenospheres and glass fiber-reinforced polyester composites are prepared by hand lay-up technique. Composites are fabricated by filling 10 wt.% and 20 wt.% of 800 nm and 200 nm size of cenosphere filler particulate respectively along with 40 wt.% of glass fiber. Glass polyester composite without filler is also prepared for proportional analysis. A series of dry sliding wear test are conducted on a pin-on-disc machine with three sliding velocities of 1.57, 2.62 and 3.66 m/s under three different normal loading of 20, 25 and 40 N for three sliding distances of 1000, 2500 and 4000 m respectively. A statistics-based design of experiments approach is used by using Taguchi's orthogonal arrays. Results reveal that mechanical properties and wear resistance of the composites increase with a decrease in the particle size. Artificial neural network (ANN) approach is also applied to the friction and wear data for subsequent validation. Finally, optimal factor settings are determined using genetic algorithm (GA). Note de contenu : - EXPERIMENTAL DETAILS : Specimen preparation - Dry sliding wear test apparatus - Mechanical characterization - Experiment design
- RESULTS AND DISCUSSION : Effect of cenosphere filler size and filler loading on the void fraction of composites - Friction and wear properties of sub-micron size cenospheres filled glass-polyester composites under steady-state condition - Taguchi experimental analysis - ANN prediction for specific wear rate
- SURFACE MORPHOLOGY
- ANOVA AN THE EFFECTS OF FACTORS
- CONFIRMATION EXPERIMENTDOI : 10.3139/217.3077 En ligne : https://drive.google.com/file/d/1-iN3w8OYOCtOdjveUhwFY6MRWawHhcFe/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24336
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Code-barres Cote Support Localisation Section Disponibilité 17309 - Périodique Bibliothèque principale Documentaires Disponible PPy doped with DBSA and combined with PSS to improve processability and control the morphology / P. Jayamurugan in INTERNATIONAL POLYMER PROCESSING, Vol. XXX, N° 3 (07/2015)
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Titre : PPy doped with DBSA and combined with PSS to improve processability and control the morphology Type de document : texte imprimé Auteurs : P. Jayamurugan, Auteur ; Veerappa Gounder Ponnuswamy, Auteur ; S. Ashokan, Auteur ; Y. V. Subba Rao, Auteur ; T. Mahalingam, Auteur Année de publication : 2015 Article en page(s) : p. 422-427 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acide dodécylbenzène sulfonique
Analyse spectrale
Analyse thermique
Composites
Composites -- Analyse
Polypyrroles
Polystyrène sulfone
Taille des particulesIndex. décimale : 668.4 Plastiques, vinyles Résumé : DBSA (Dodecylbenzene sulfonic acid)/PSS (Polystyrene sulfonic acid) doped polypyrrole composites were synthesized by in-situ chemical oxidative polymerization method with 0 to 5°C reaction temperature for 24 h. The particle size distribution of DBSA and PSS doped polypyrrole composites were found at 78 nm, 66 nm, 85 nm, 120 nm and 173 nm for different weight ratios of PSS. The presence of sulfur and higher doping level was confirmed by energy dispersive X-ray analysis. The mass percentages of sulfur were found in 17.94%, 34.41%, 40.87%, 44.9% and 48.16% for various weight ratios of PSS. The SEM study shows the granular morphology and aggregation of polypyrrole composites. Thermal stability improves with higher concentration of PSS. FTIR study confirms the presence of dopants in the composite structure. The UV-study reveals the ???* transition in benzenoid rings of DBSA and presence of PSS. The conductivity of polypyrrole composite increases maximum upto 2.5 wt% of PSS and then decreases with increasing PSS content. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of DBSA doped PPY and combined with PSS
- RESULTS AND DISCUSSION : FTIR spectrum of DBSA and PSS doped polypyrrole composites - Conductivity measurements for DBSA and PSS doped polypyrrole composites - UV-VIS absorption for different weight percentage of PSS and DBSA doped polypyrrole composites - Particle size distribution of different weight percentage of PSS and DBSA doped polypyrrole composites - Thermal analysis of different weight percentage of PSS and doped DBSA polypyrrole compositesDOI : 10.3139/217.3037 En ligne : https://drive.google.com/file/d/1Z5WnNWZ4qnDypM_0bguSSZr1uzUkZROP/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24337
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Code-barres | Cote | Support | Localisation | Section | Disponibilité |
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17309 | - | Périodique | Bibliothèque principale | Documentaires | Disponible |