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Research and application of wireless temperature measurement device in high temperature enclosed environment / Qin Liu in INTERNATIONAL POLYMER PROCESSING, Vol. XXXI, N° 2 (05/2016)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXI, N° 2 (05/2016) . - p. 150-155 Titre : Research and application of wireless temperature measurement device in high temperature enclosed environment Type de document : texte imprimé Auteurs : Qin Liu, Auteur ; C. Chengtao, Auteur ; Y. Huachun, Auteur ; Z. Guocai, Auteur Année de publication : 2016 Article en page(s) : p. 150-155 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Corps creux Essais (technologie) Matières plastiques -- Rotomoulage Mesure -- Instruments Thermométrie Index. décimale : 668.4 Plastiques, vinyles Résumé : Rotational molding, which is widely used in furnishing, entertainment facilities, automotive and boats, military industry and other fields, is a forming method used to produce hollow thermoplastic products. Temperature is the most important process parameter in the rotational molding process, so accurate temperature modulation and control are undoubtedly the main way to ensure product quality. During the rotational molding process, temperature in the oven is very high. Current temperature measuring device cannot make real-time measurement and cannot provide the necessary reference for accurate temperature modulation and control. This article provides an analysis of a wireless temperature measurement device which is used in high temperature enclosed environment, researches the structure, the barrier principle of the temperature measurement device. Finally, tests have been done to verify the working performance. Accurate monitoring and control of the temperature parameter during the rotational molding process can not only improve the working efficiency and energy efficiency of the rotational molding machine, but also provide the reference to design the rotational molding device and molds. Note de contenu : - EXPERIMENTAL : Temperature measurement principle - Testing - Equipment - Test facility - Parameters setting - Test conditions - Test goals - Test steps - RESULTS AND DISCUSSION : Communication status - Heat insulation performance - Proofreading the measured values DOI : 10.3139/217.3018 En ligne : https://drive.google.com/file/d/1Q20QzWcloi_2ivHejiMegVDEAeSDihld/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26169 [article]

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Influence on product quality by PVT-optimised processing in injection compression molding / Christian Hopmann in INTERNATIONAL POLYMER PROCESSING, Vol. XXXI, N° 2 (05/2016)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXI, N° 2 (05/2016) . - p. 156-165 Titre : Influence on product quality by PVT-optimised processing in injection compression molding Type de document : texte imprimé Auteurs : Christian Hopmann, Auteur ; A. Reßmann, Auteur ; Julian Heinisch, Auteur Année de publication : 2016 Article en page(s) : p. 156-165 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Matières plastiques -- Moulage par compression Mesure de pression-volume-température Index. décimale : 668.4 Plastiques, vinyles Résumé : The production of functional optical parts made of plastics is a growing market and the associated production processes have to be developed to fulfil the increasing quality requirements. In this paper an alternative injection compression molding process using the pvT-behavior of the plastics material is compared to the conventional processing method using an isobaric process path. For both control strategies a cavity pressure loop-control is implemented and used. According to measurements of the mold surface reproduction accuracy and internal properties of the molded part the processing method using the pvT-behavior results in a higher optical part quality in the same cycle time compared to the isobaric processing method. Note de contenu : - INTRODUCTION : Categorised variables - Quality of optical components - The pvT-optimised process control - Developments in injection compression molding for optics - BASICS FOR THE IMPLEMENTATION OF A PVT-OPTIMISATION - PROCESS SET-UP : Set-up of the injection phase - Implementing a cavity pressure controlled isobaric process - Set-up of a cavity pressure controled pvT-optimisation process - RESULTS OF THE INVESTIGATED PROCESS CONTROL VARIANTS : Design of experiments - Accuracy of the mold surface reproduction DOI : 10.3139/217.3058 En ligne : https://drive.google.com/file/d/1EOfZVW1I10VsNJjACfbA0ZxLWf6iru31/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26170 [article]

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Effect of plug temperature on the strain and thickness distribution of components made by plug assist thermoforming / D. Marathe in INTERNATIONAL POLYMER PROCESSING, Vol. XXXI, N° 2 (05/2016)

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXI, N° 2 (05/2016) . - p. 166-178 Titre : Effect of plug temperature on the strain and thickness distribution of components made by plug assist thermoforming Type de document : texte imprimé Auteurs : D. Marathe, Auteur ; D. Rokade, Auteur ; L. Busher Azad, Auteur ; K. Jadhav, Auteur ; S. Mahajan, Auteur ; Z. Ahmad, Auteur ; S. Gupta, Auteur ; S. Kulkarni, Auteur ; V. Juvekar, Auteur ; Ashish Lele, Auteur Année de publication : 2016 Article en page(s) : p. 166-178 Langues : Anglais (eng) Catégories : Etirement (mécanique) Matières plastiques -- Thermoformage Polymères -- Effets de la température Polystyrène choc Rhéologie Index. décimale : 668.4 Plastiques, vinyles Résumé : Plug temperature is a key parameter affecting the thickness distribution of thermoplastic components made by plug assist thermoforming. For a specified pair of plug and plastic sheet, the variation in plug temperature can alter the coefficient of friction (COF) between the pair. We show here how the temperature dependence of COF influences the nature and extent of biaxial stretching of the sheet and consequently the thickness distribution of the thermoformed component. In the present study, high impact polystyrene (HIPS) sheets were thermoformed into axisymmetric cups using a plug-assist process in which the aluminum plug temperature (Tplug) was varied from ambient to above the glass transition temperature of HIPS (∼100 °C). Biaxial strain maps on the surfaces of the formed cups were measured and quantified using Grid Strain Analysis (GSA). Thickness distributions of the cups were also measured. Temperature dependent COF between HIPS and aluminum was determined independently using a rotational rheometer. The measured COF was low for T < 100 °C, whereas it increased appreciably at and above 100 °C. We conclude that when Tplug < 100 °C the HIPS sheet slips on the plug during forming, and this results in biaxial stretching of the base and walls of the formed cup. In contrast for Tplug > 100 °C, a significant reduction in the magnitude of slip is expected. Here the sheet is gripped at the clamp and by the plug during forming which causes reduced biaxial stretching of the base and increased uniaxial stretching of the walls of the cup. Simulations of plug-assist thermoforming using a temperature dependent COF showed qualitative agreement with the GSA data thereby supporting our inferences. DOI : 10.3139/217.3060 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26171 [article]

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Influence of processing parameters and composition on the effective compatibilization of polypropylene–poly(ethylene terephthalate) blends / E. P. A. van Bruggen in INTERNATIONAL POLYMER PROCESSING, Vol. XXXI, N° 2 (05/2016)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXI, N° 2 (05/2016) . - p. 179-187 Titre : Influence of processing parameters and composition on the effective compatibilization of polypropylene–poly(ethylene terephthalate) blends Type de document : texte imprimé Auteurs : E. P. A. van Bruggen, Auteur ; R. P. Koster, Auteur ; S. J. Picken, Auteur ; Kim Ragaert, Auteur Année de publication : 2016 Article en page(s) : p. 179-187 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alliages polymères Compatibilité chimique et physique Copolymère styrène-éthylène-butadiène Copolymères greffés Méthacrylate de glycidyle Polyéthylène glycol Polyéthylène téréphtalate Polypropylène Index. décimale : 668.4 Plastiques, vinyles Résumé : The effects of the addition of different functionalized compatibilizers on toughness, morphology and rheological properties of a polypropylene (PP) – poly(ethylene terephthalate) (PET) (85–15 wt%) blend were studied. The three compatibilizers compared were: (Styrene Ethylene Butylene Styrene)-grafted-(glycidyl methacrylate); (Styrene Ethylene Butylene Styrene) – grafted – (maleic anhydryde); (polyolefin) – grafted – (glycidyl methacrylate), abbreviated to: SEBS-g-GMA, SEBS-g-MA and POE-g-GMA respectively. The effective grafting content was the same for all three compatibilizers. Before the comparison of the different compatibilizers was done, first the effects of three different processing temperatures and three different compatibilizer contents were investigated, based on the addition of SEBS-g-GMA. The compatibilization effect was significantly improved with an increase in processing temperature from 250 to 300 °C. The toughness was increased with almost a factor two and a decrease in the average domain size of the dispersed phase was observed. An increase in compatibilizer content from 0.25 to 2.5 wt% resulted in a finer dispersity as well as in a steep increase in toughness, which was noted to approach the brittle-to-ductile transition. The comparison of the three compatibilizers was subsequently done at the most promising processing temperature and content: 300 °C and 2.5 wt%. The results showed that the addition of SEBS-g-MA and POE-g-GMA had a less significant positive effect on the compatibilization compared to SEBS-g-GMA. The difference is attributed to a higher reactivity for GMA compared to MA and a higher possibility for migration towards the PP-PET interface for the SEBS chain compared to the POE chain. Note de contenu : - MATERIALS AND METHODS : Materials - Processing - Mechanical testing - Scanning electron microscope - Rheological measurement - RESULTS AND DISCUSSION : Processing temperature - Compatibilizer content - Structural interactivity DOI : 10.3139/217.3124 En ligne : https://drive.google.com/file/d/1-Gy8zgRGrK8PcK7C3XQezkn_HIiwLg9w/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26172 [article]

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Impact modification of isotactic polypropylene with ethylene-propylene diene monomer rubber / J. Banerjee in INTERNATIONAL POLYMER PROCESSING, Vol. XXXI, N° 2 (05/2016)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXI, N° 2 (05/2016) . - p. 188-197 Titre : Impact modification of isotactic polypropylene with ethylene-propylene diene monomer rubber Type de document : texte imprimé Auteurs : J. Banerjee, Auteur ; P. Soliya, Auteur ; M. B. Pallavi, Auteur ; P. Mukhopadhyay, Auteur ; S. Bandyopadhyay, Auteur ; D. Chakrabarty, Auteur ; Kingshuk Dutta, Auteur Année de publication : 2016 Article en page(s) : p. 188-197 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alliages polymères Anhydride maléique Compatibilité chimique et physique Copolymères -- Propriétés mécaniques Copolymères greffés Ethylène-propylène-diène monomère Peroxyde de dicumyle Polymères isotactiques Polypropylène Index. décimale : 668.4 Plastiques, vinyles Résumé : The present work was done to improve the impact property of isotactic polypropylene (PP), especially at low temperatures, by incorporating ethylene propylene diene monomers (EPDM). This was done by ensuring compatibility between the two polymers with phase modifiers polyethylene grafted with maleic anhydride (PE-g-MA) and initiator dicumyl peroxide (DCP). In addition, attempts were also made to understand the fundamentals of impact toughening as well as fracture toughness, and to correlate the results with that of morphological evidences obtained from scanning electron microscopy (SEM) and X-ray diffraction (XRD) methods. Varying the ratios of all blend composition, mechanical properties were studied. It was observed that as the rubber fraction increased, the impact property as well as fracture toughness increased. All these tests also showed promising results when PE-g-MA was added, leading to more improvement in all the mechanical properties including increase in crystallite size. It had shown plasticization effect on the compositions, which could be further confirmed by differential scanning calorimetry (DSC) compared to the uncompatibilized ones. But when DCP was added, it behaved like an initiator which directly reacted with the PP matrix, decreasing the molecular weight of the blend with decreasing size of the crystallites. Note de contenu : - EXPERIMENTAL : Materials - Sample preparation - Characterization techiques - RESULTS AND DISCUSSION : Analysis of impact strength of the compatibilized and the uncompatibilized blends - Evaluation and characterization of the fracture toughness DOI : 10.3139/217.3143 En ligne : https://drive.google.com/file/d/1B2xYOGcGqh8ojjgsj6Ynl_TNaUTX1wEM/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26173 [article]

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Impact behavior of continuous biaxial reinforced composites based on bio-polyamides and man-made cellulose fibres / Maik Feldmann in INTERNATIONAL POLYMER PROCESSING, Vol. XXXI, N° 2 (05/2016)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXI, N° 2 (05/2016) . - p. 198-206 Titre : Impact behavior of continuous biaxial reinforced composites based on bio-polyamides and man-made cellulose fibres Type de document : texte imprimé Auteurs : Maik Feldmann, Auteur ; Fabian Verheyen, Auteur Année de publication : 2016 Article en page(s) : p. 198-206 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bioplastiques Composites à fibres -- Propriétés mécaniques Composites à fibres de verre Composites à fibres végétales Polyamides Un 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. Polypropylène Index. décimale : 668.4 Plastiques, vinyles Résumé : Composites based on thermoplastic matrix and glass or carbon fibre fabrics, like the so called organic sheets, show high potential for structural parts, e. g. in automotive applications. In this study renewable organic sheets based on bio-polyamides with a melting point above 200 °C and polypropylene for reference purposes were prepared. High energy absorption for these composites were expected regarding the high elongation at break (> 10 %) of the man-made cellulose fibres. In comparison to the cellulose reinforced composites, glass fibre composites were prepared. The complete or partly bio-based composites, with a thickness of approx. 2 mm, were manufactured by a high precision hot-press using the film-stacking-process considering less fibre degradation at high processing temperatures. Besides dart drop tests (penetration mode and impact mode) and optical microscopy were done to characterize the composites. The bio-based composites show lower density, higher energy absorption rates and lower damping values as a consequence of the cellulose fibres properties and the fibre-matrix-adhesion. Note de contenu : - EXPERIMENTAL : Materials - Composites preparation - Characterization - RESULTS AND DISCUSSION : Fibre content - Optical microscopy - Dart drop test (penetration mode) - Dart drop (impact mode) DOI : 10.3139/217.3142 En ligne : https://drive.google.com/file/d/1iWUFHdeQMgGcgtIXx4fuBF0FY-bnqL0V/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26174 [article]

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Preparation and anti-fouling property of acryloylmorpholine-grafted PVDF membrane : the effect of cross-linking agent / Xueye Shen in INTERNATIONAL POLYMER PROCESSING, Vol. XXXI, N° 2 (05/2016)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXI, N° 2 (05/2016) . - p. 207-216 Titre : Preparation and anti-fouling property of acryloylmorpholine-grafted PVDF membrane : the effect of cross-linking agent Type de document : texte imprimé Auteurs : Xueye Shen, Auteur ; J. Liu, Auteur ; Y. Zhao, Auteur ; L. Chen, Auteur Année de publication : 2016 Article en page(s) : p. 207-216 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adsorption Angle de contact Copolymères -- Synthèse Copolymères greffés Membranes (technologie) Perméation Polyacryloylmorpholine Polyfluorure de vinylidène Protéines Index. décimale : 668.4 Plastiques, vinyles Résumé : Inspired by the hydration capability of hydrogel materials, cross-linked poly(N-acryloylmorpholine) (PACMO) chains were designed into poly(vinylidene fluoride) (PVDF) backbones to synthesize the copolymers (PVDF-g-PACMO) using the radical polymerization method. These copolymers were then cast into the porous membranes via immersion phase inversion. The effects of N,N?-methylenebisacrylamide (MBAA) in the reaction solution on the structure and performance of as-prepared copolymer membranes were evaluated by elemental analysis, X-ray photoelectronic spectroscopy, field emission scanning electron microscopy, water contact angle measurement, protein adsorption and filtration experiment. The grafting degree of PACMO increases with the increase of MBAA amount in the reaction solution, which endows the copolymer membrane with a good hydrophilicity. The protein adsorption and irreversible membrane fouling decrease and then further increase with the elevated grafting degree of PACMO. This result indicates that the anti-fouling property of membrane not only depends on the surface hydrophilicity and but also associates with the grafting structures of PACMO. This work provides a fundamental understanding of various grafting structures governing the performance of anti-fouling properties. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of PVDF-g-PACMO copolymer - Preparation of PVDF-g-PACMO copolymer membrane - Membrane characterizations - Protein adsorption - Filtration experiments - RESULTS AND DISCUSSIONS : Chemical structure of PVDF-g-PACMO membrane - Morphology of PVDF-g-PACMO membrane - Hydrophilicity of PVDF-g-PACMO membrane - Protein adsorption - Permeation performance of PVDF-g-PACMO DOI : 10.3139/217.3150 En ligne : https://drive.google.com/file/d/12AXTiFWlhjB5Ks5rKSxDZOzcwVulLimE/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26178 [article]

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Fine filament formation behavior of polymethylpentene and polypropylene near spinneret in melt blowing process / R. Ruamsuk in INTERNATIONAL POLYMER PROCESSING, Vol. XXXI, N° 2 (05/2016)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXI, N° 2 (05/2016) . - p. 217-223 Titre : Fine filament formation behavior of polymethylpentene and polypropylene near spinneret in melt blowing process Type de document : texte imprimé Auteurs : R. Ruamsuk, Auteur ; W. Takarada, Auteur ; Takeshi Kikutani, Auteur Année de publication : 2016 Article en page(s) : p. 217-223 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Etat fondu (matériaux) Filature Matières plastiques -- Soufflage Mouvement rotatoire Polyméthylpentène Le polyméthylpentène (de sigle PMP ou TPX) est un polymère thermoplastique de la famille des polyoléfines. Son nom dans la nomenclature IUPAC est poly(4-méthylpent-1-ène). Il résulte de la polyaddition du monomère 4-méthylpent-1-ène (numéro CAS 691-37-2) avec catalyse de Ziegler-Natta. Les produits disponibles dans le commerce sont généralement des copolymères. Ils peuvent être extrudés et moulés par moulage par injection ou par moulage par soufflage. À température ambiante, il est parfaitement transparent (bien qu'il soit semi-cristallin) et très perméable aux gaz. Il est hydrophobe, autoclavable à 135 °C et résiste pendant une courte durée à une température d'environ 175 °C (dépend des grades disponibles). Le PMP se classe parmi les polymères thermoplastiques les plus thermostables. Sa température de fusion est élevée, de 230 à 240 °C. Sa densité, de 0,83, est la plus faible des polymères thermoplastiques. Sa rigidité est similaire au polypropylène (PP). Sa résistance à l'oxydation est inférieure à celle du PE. On doit donc lui incorporer des additifs antioxydants. Il est couramment utilisé pour le matériel médical et de laboratoire, mais aussi en cuisine ou pour des composants électroniques. Polypropylène Index. décimale : 668.4 Plastiques, vinyles Résumé : Formation behavior of fine fibers of polymethylpentene (PMP) and polypropylene (PP) in the melt blowing process was investigated through the observation of the spin-line near the spinning nozzle using a high speed camera. Reduction of the polymer throughput rate and increase of the air flow rate were necessary to achieve fine diameter fibers, however these conditions generally cause the instability in the spinning process. Observation of the spin-line at the melt blowing die revealed the periodic accumulation of polymer flow near the spinning nozzle followed by the quick pulling down of the accumulated polymer by the air flow. This behavior caused the periodic fluctuation of fiber diameter as well as the intermittent breakage of the spin-line under extreme conditions. Because of high extrusion viscosity, PMP showed more stable spinning behavior than PP. Frequency of diameter fluctuation became higher with the increases of air flow rate and throughput rate, and the maximum frequency of about 60 Hz was observed for PP spinning with the throughput rate of 0.18 g/min. Diameter distribution of the fibers in the prepared web was also analyzed to compare with the spinning behavior. Fiber diameter distributions were narrow and symmetric under stable spinning conditions, whereas skewed diameter profiles with a maximum at low value and a long tail to the larger diameter region were observed under unstable conditions. Intermittent spin-line breakage caused flaws of "shot" and/or "fly", and the skewed fiber diameter distribution with the presence of a small amount of fiber of extremely large diameter was confirmed. Note de contenu : - EXPERIMENTAL : Materials - Melt blowing equipment and conditions - In-situ observation - Analysis of fiber diameter distribution - RESULTS AND DISCUSSION : Fiber formation behavior near spinneret - Fiber diameter distribution - Estimation of fiber velocity - Some consideration on instability DOI : 10.3139/217.3163 En ligne : https://drive.google.com/file/d/1b9rnzo6zxa4c_0sJGSD0MJiEqWQNWYrE/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26179 [article]

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Fracture toughness of PP/EPDM/nano-ternary composites : the role of distribution of inorganic particles / L. Gong in INTERNATIONAL POLYMER PROCESSING, Vol. XXXI, N° 2 (05/2016)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXI, N° 2 (05/2016) . - p. 224-232 Titre : Fracture toughness of PP/EPDM/nano-ternary composites : the role of distribution of inorganic particles Type de document : texte imprimé Auteurs : L. Gong, Auteur ; S.-H. Chen, Auteur ; W.-M. Hou, Auteur ; B. Yin, Auteur ; L.-P. Li, Auteur ; M.-B. Yang, Auteur Année de publication : 2016 Article en page(s) : p. 224-232 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alliages polymères -- propriétés mécaniques Angle de contact Carbonate de calcium Le carbonate de calcium (CaCO3) est composé d'un ion carbonate (CO32-) et d'un ion calcium (Ca2+), sa masse molaire est de 100,1 g/mole. C'est le composant principal du calcaire et de la craie, mais également du marbre. C'est aussi le principal constituant des coquilles d'animaux marins, du corail et des escargots. Dioxyde de silicium Ethylène-propylène-diène monomère Nanoparticules Polypropylène Résistance au chocs Index. décimale : 668.4 Plastiques, vinyles Résumé : The influence of the distribution of the inorganic particles on the toughness of the PP/EPDM/nano-ternary composites was investigated. Four morphologies for PP/EPDM/nano-ternary composites were obtained by means of adjusting the surface tension of inorganic particles (nano-CaCO3, hydrophobic nano-SiO2 and hydrophilic nano-SiO2) and the compounding sequence (one-step extrusion and two-step extrusion). Morphological observation revealed that the segregated dispersion morphology was formed in the PP/EPDM/CaCO3 composite. For the PP/EPDM/R974 (hydrophobic nano-SiO2) composite, R974 particles were dispersed at the interface between the PP matrix and EPDM dispersed phase. A200 particles (hydrophilic nano-SiO2) continuously dispersed between PP and EPDM phase for PP/EPDM/A200 composites prepared by one-step, while were present in EPDM dispersed phase for the two-step PP/EPDM/A200 composites. The dependence of the toughness on the phase morphology of the components, especially the distribution of nanoparticles, was studied systematically. The impact strength of one-step PP/EPDM/A200 composites was pronouncedly enhanced, increasing 552 % compared to pure PP. Compared with the other three composites, the one-step PP/EPDM/A200 composites exhibits better effect of preventing crack propagation and far higher fracture energies. It is attributed to the A200 particles continuously dispersed between EPDM phase and matrix, which makes EPDM particles have better compatibility with the PP matrix and the overlapping of the stress field with A200 particles. Note de contenu : - EXPERIMENTAL SECTION : Materials - Sample preparation - Scanning electron microscopy (SEM) - Izod impact strength testing - Contact angle measurement - Analysis of the damage zone around the surviving crack tip - Fracture toughness measurements - RESULTS AND DISCUSSION : The control of morphology for PP/EPDM/nanoternary composites - Izod impact strength - Investigation of the fracture and toughening mechanisms - The role of nano-particles distribution on the impact toughness DOI : 10.3139/217.3174 En ligne : https://drive.google.com/file/d/1wEchFcOOTuehwoS7fLqtGW5HFvEKG_-v/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26180 [article]

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CO2 laser ablation of microchannel on PMMA substrate for effective fabrication of microfluidic chips / X. Chen in INTERNATIONAL POLYMER PROCESSING, Vol. XXXI, N° 2 (05/2016)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXI, N° 2 (05/2016) . - p. 233-238 Titre : CO2 laser ablation of microchannel on PMMA substrate for effective fabrication of microfluidic chips Type de document : texte imprimé Auteurs : X. Chen, Auteur ; T. Li, Auteur ; J. Shen, Auteur Année de publication : 2016 Article en page(s) : p. 233-238 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Polyméthacrylate de méthyle Le 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. Puces microfluidiques Usinage par laser Index. décimale : 668.4 Plastiques, vinyles Résumé : This paper reports a simple and rapid method for fabrication of microfluidic chips on polymethylmethacrylate (PMMA) substrate using a flexible and low-cost CO2 laser system. The CO2 laser employed has a wavelength of 10.6 ?m. The laser power used for channel fabrication ranged from 3 and 12 W, the beam travel speeds ranged from 5 to 50 mm/s and the passes were varied in the range of 1 to 3 times. Typical channel depths were between 100 and 900 ?m, while the width of fabricated channels ranged from 100 to 300 ?m. The effects of the process parameters (the laser power, the beam travel speed of the laser beam and the number of passes) on the dimensional quality (the depth, the width and their aspect ratio) of the microchannel manufactured from PMMA were experimentally investigated. The change law of the channel geometry depending on process parameters was obtained. A high reproducibility of micro-channel geometry was attained. At last, a CO2 laser output power of 5.5 W and a laser beam travel speed of 35 mm/s combining a hot press bonding technique were chosen to fabricate a microfluidic chip within half hour. The pattern qualities and experimental results confirm that the CO2 laser micromachining technology has a great potential for application in flexible, rapid and economic production of polymeric microfluidic chips. Note de contenu : - MATERIALS AND METHODS : Materials and reagents - Experimental set up - Laser ablation process of microchannel - RESULTS AND DISCUSSION : Channel profile - Effects of laser power and beam travel speed on depth of microchannel - Effects of laser power and beam travel speed on width of microchannel - Effects of the pass on depth of microchannel - Effects of the pass on width of microchannel - Fabrication of large aspect ratio of microchannel - Hot press bonding of microchannel DOI : 10.3139/217.3184 En ligne : https://drive.google.com/file/d/1T_p4aH5CnIMAx_7J41UGIYq8jjwd8Ygx/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26181 [article]

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A novel micro wall slip model based on chain length and temperature / Y. Lou in INTERNATIONAL POLYMER PROCESSING, Vol. XXXI, N° 2 (05/2016)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXI, N° 2 (05/2016) . - p. 239-246 Titre : A novel micro wall slip model based on chain length and temperature Type de document : texte imprimé Auteurs : Y. Lou, Auteur ; J.-L. Bai, Auteur ; P.-Q. He, Auteur Année de publication : 2016 Article en page(s) : p. 239-246 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Etat fondu (matériaux) Matières plastiques -- Moulage par injection Polypropylène Polystyrène Rhéologie Index. décimale : 668.4 Plastiques, vinyles Résumé : A micro chain length and temperature (MCLT) wall slip model of polymer was developed on the basis of chain length and temperature. The effectiveness and accuracy of the MCLT slip model were verified through a micro-square-column filling rate experiment for Polypropylene (PP) material and a micro-square-column pressure difference experiment for Polystyrene (PS) material. The difference between the simulated data of the MCLT slip model and the experimental data decreased with decreasing feature size. The accuracy of the MCLT slip model was enhanced by decreasing the feature size. When the feature size was decreased to 200 ?m, the maximum deviation between the simulated filling rate by the MCLT slip model and the experimental result was 8.67 %. Moreover, under different shearing rates, the simulated pressure drop by the MCLT slip model was closer to the experimental result than that by the conventional slip model. The micro-scale flow characteristics of the melt were also explored using the MCLT slip model. Melt flow velocity decreased from the center of the micro-channel to the wall, and the wall slip phenomenon was beneficial to the melt flow. Note de contenu : - Establishment of MCLT slip model - Micro-square-column injection filling rate experiment - Micro-square-column pressure difference experiment - Influence of wall slip on flow velocity distribution DOI : 10.3139/217.3191 En ligne : https://drive.google.com/file/d/15Vy55Jfde6m1wO2_vUNfclxtd41Y2P8z/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26182 [article]

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Electrical and mechanical properties of antistatic poly(vinyl chloride) composites filled with silver plated hollow glass microspheres / J. Wang ; X. L. Chen ; S. H. Qi in INTERNATIONAL POLYMER PROCESSING, Vol. XXXI, N° 2 (05/2016)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXI, N° 2 (05/2016) . - p. 247-253 Titre : Electrical and mechanical properties of antistatic poly(vinyl chloride) composites filled with silver plated hollow glass microspheres Type de document : texte imprimé Auteurs : J. Wang, Auteur ; X. L. Chen, Auteur ; S. H. Qi, Auteur Année de publication : 2016 Article en page(s) : p. 247-253 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Antistatiques Argent Charges (matériaux) Chlorure de polyvinyle Composites -- Propriétés électriques Composites -- Propriétés mécaniques Microsphères Verre Index. décimale : 668.4 Plastiques, vinyles Résumé : Antistatic poly(vinyl chloride) (PVC) composites filled with silver plated hollow glass microspheres (Ag-HGMs) were prepared using the melt-mixing method. Electrical resistivity and mechanical properties of the Ag-HGMs/PVC composites were subsequently investigated. The results show that the HGMs were successfully coated with a uniform and compact silver layer. With increasing Ag-HGMs content, the volume resistivity of Ag-HGMs/PVC composites decreases nonlinearly. With an Ag-HGMs content of about 120 phr, reaching the percolation concentration, the composites meet the antistatic requirements for commercial antistatic PVC materials. Furthermore, the tensile strength of Ag-HGMs/PVC composites decreases with increasing content of Ag-HGMs, while the impact strength increases with increasing content of Ag-HGMs from 0 phr to 150 phr. We especially found that with a Ag-HGMs/PVC composites exhibit great impact strength. Note de contenu : - EXPERIMENTAL SECTION : Materials - Preparation of Ag-HGMs - Preparation of Ag-HGMs/PVC composites - Characterization - RESULTS AND DISCUSSION : Structures of Ag-HGMs - Conductivity characteristic of Ag-HGMs/PVC - Structure of Ag-HGMs/PVC composites - Mechanical properties of Ag-HGMs/PVC composites DOI : 10.3139/217.3202 En ligne : https://drive.google.com/file/d/1PK5QPUhEv3kvhHOKpoca1IL2sn3WbmPU/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26183 [article]

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Prototype system to study the effect of weld lines on the performance of extruded profiles / Olga. S. Carneiro in INTERNATIONAL POLYMER PROCESSING, Vol. XXXI, N° 2 (05/2016)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXI, N° 2 (05/2016) . - p. 254-261 Titre : Prototype system to study the effect of weld lines on the performance of extruded profiles Type de document : texte imprimé Auteurs : Olga. S. Carneiro, Auteur ; A. R. Mota, Auteur ; Y. Sitotaw, Auteur ; J. M. Nóbrega, Auteur Année de publication : 2016 Article en page(s) : p. 254-261 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Lignes de soudure Matières plastiques -- Extrusion Profilés Prototypes Index. décimale : 668.4 Plastiques, vinyles Résumé : In several thermoplastic extrusion based processes the melt flow has to be divided into independent streams that are merged before the flow channel outlet. This promotes the formation of weld lines, usually related to mechanical weak zones and aesthetic imperfections. There is a large amount of scientific publications related to weld lines formed in other processing techniques, e. g. injection molding. However, studies related to extrusion are scarce. This work presents the conception of a new prototype system that allows performing systematic studies aiming a better understanding of the effect of weld lines in extrusion. A case study illustrates the employment of the developed device to study the effect of several process parameters (e. g. spider leg location, processing temperature and flow rate) on the mechanical performance of the extruded profiles. Note de contenu : - PROTOTYPE SYSTEM : Description - Potential - Case study - RESULTS AND DISCUSSION : Effect of the spider leg location - Effect of extrusion temperature - Effect of flow rate DOI : 10.3139/217.3200 En ligne : https://drive.google.com/file/d/1FZcrG6VJKc5UdqeuDP0ztIS8puG9pDnU/view?usp=drive [...] Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26184 [article]

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Extrudate swell of high density polyethylenes in slit (flat) dies / V. K. Konaganti in INTERNATIONAL POLYMER PROCESSING, Vol. XXXI, N° 2 (05/2016)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXI, N° 2 (05/2016) . - p. 262-272 Titre : Extrudate swell of high density polyethylenes in slit (flat) dies Type de document : texte imprimé Auteurs : V. K. Konaganti, Auteur ; E. Behzadfar, Auteur ; M. Ansari, Auteur ; Evan Mitsoulis, Auteur ; Savvas G. Hatzikiriakos, Auteur Année de publication : 2016 Article en page(s) : p. 262-272 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Matières plastiques -- Extrusion Mesure Modèles mathématiques Polyéthylène haute densité Rhéologie Index. décimale : 668.4 Plastiques, vinyles Résumé : Extrudate swell of industrial-grade high-molecular mass high-density polyethylenes (HDPEs) in flat/slit dies is studied using both experiments and simulations. The experimental set-up consists of an optical micrometer to measure the extrudate dimensions and a pair of radiation heaters to control the extrudate temperature outside the die attached to the capillary rheometer. The simulation of extrudate swell phenomenon is carried out by using a well-known integral K-BKZ model. The effects of several rheological characteristics, die characteristics, and processing conditions on swell measurements are studied systematically, and the corresponding two-dimensional, steady-state numerical predictions are presented in this paper. This study includes the effects of polymer molecular characteristics, apparent shear rate, die geometrical characteristics (length to die gap (L/H) and width to die gap (W/H)), and distance from the die exit. It is found that the integral K-BKZ model predicts well both the width and thickness extrudate swells. Extrudate swell measurements demonstrate that the thickness swell is predominant in comparison with width swell. Note de contenu : - EXPERIMENTAL : Materials and rheological methods - Extrudate swell measurements - MATHEMATICAL MODELING : Governing equations - Constitutive equations - Boundary conditions - Method of solution - RESULTS AND DISCUSSION : Rheological characterization - Extrudate swell measurements DOI : 10.3139/217.3215 En ligne : https://drive.google.com/file/d/1PwNvpZbFckA66bu9PWrEohRbc7-6GBU4/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26185 [article]

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