Characterization of adansonia digitata (baobab wood) bio-oil and biochar produced using a fixed-bed tubular reactor / Tahar Masri in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES, Vol. 33, N° 1 (02/2023)  

[article]  inREVUE DES COMPOSITES ET DES MATERIAUX AVANCES > Vol. 33, N° 1 (02/2023) . - p. 13-19 Titre : Characterization of adansonia digitata (baobab wood) bio-oil and biochar produced using a fixed-bed tubular reactor Type de document : texte imprimé Auteurs : Tahar Masri, Auteur ; Mohamed Yagoub, Auteur ; Amar Rouag, Auteur ; Adel Benchabane, Auteur ; Belhi Guerira, Auteur Année de publication : 2023 Article en page(s) : p. 13-19 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Biochar Le biochar est un amendement du sol issu de la pyrolyse de biomasse. Il est utilisé en agriculture pour augmenter la qualité des sols, et donc leur productivité ; il est également utilisé dans la lutte contre le réchauffement climatique comme solution de séquestration à long terme de carbone atmosphérique dans les sols. Le biochar se différencie du charbon de bois par son utilisation (comme intrant plutôt que comme combustible) et donc par son impact environnemental (il agit comme un puits de carbone plutôt que de libérer du CO2 dans l'atmosphère lors de la combustion). Caractérisation Composites -- Propriétés mécaniques Composites -- Propriétés physiques Composites -- Propriétés thermiques Composites polymères Huiles et graisses végétales Pneus polymères expansés -- Recyclage Polystyrène Recyclage (déchets, etc.) Thermocinétique Index. décimale : 668.4 Plastiques, vinyles Résumé : This study aims to valorise industrial waste of Expanded Polystyrene Packaging waste (EPS) and used tire waste, in the production of a new composite material. The new composite material RTPC (Rubber Tire Polystyrene Composite) is a mixture of rubber particles from used tires, as reinforcement, and a matrix obtained by recycling EPS with gasoline. In this study, several matrix/reinforcement weight proportions (25%, 30% and 35%) and several reinforcement particle sizes (2-3, 3-4 and 4-5 mm) were considered. Physical, mechanical and thermal characterization were carried out in order to determine the density, the flexural modulus, the maximum stress and the thermal conductivity of the composite material. According to the obtained results, the RTPC material obtained is considered as a light material with a density between 500 and 600 kg/m3. The thermal characterization tests of the RTPC material also showed that the RTPC is an insulating material with thermal conductivity between 0.22 and 0.23 W/m.K. On the other hand, the three-point bending tests showed that the RTPC material has poor bending properties. The RTPC material can be used in the field of building construction as a good thermal insulator. The RTPC material can be used in other applications as a structural component in sandwich structures if its mechanical properties will improve. Note de contenu : - MATERIALS AND METHODS : Materials - RTPC characterizations - RESULTS AND DISCUSSION : Three bending test properties - The density of RTPC material - Thermal conductivity of the RTPC material - Table 1 : Various RTPC tested samples - Table 2 : Mechanical, physical and thermal properties of RTPC material DOI : https://doi.org/10.18280/rcma.330103 En ligne : https://iieta.org/download/file/fid/91636 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39261 [article]

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Co-extrusion with thermal control / Georg Burmann in KUNSTSTOFFE INTERNATIONAL, Vol. 109, N° 9 (09/2019)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 109, N° 9 (09/2019) . - p. 98-101 Titre : Co-extrusion with thermal control : Combining polymers with very different processing temperatures Type de document : texte imprimé Auteurs : Georg Burmann, Auteur ; Patrick Weiss, Auteur Année de publication : 2019 Article en page(s) : p. 98-101 Langues : Anglais (eng) Catégories : Composites polymères Filières d'extrusion circulaire Matières plastiques -- Extrusion Structures multicouches Traitement thermique Tubes Index. décimale : 668.4 Plastiques, vinyles Résumé : New polymer composites for the production of multi-layer small tubes are being developed to give products specific functions. With suitable co-extrusion dies and a thermal barrier option, even complex layer composites with melt temperature differences of more than 50 °C can be processed reliably and in high quality. Note de contenu : - Circular distributor dies avoid flow lines - Demands on co-extrusion dies - Suitable for complex materials combinations - Simulating thermal behavior in the die - A die for less complex materials combinations - Principle of circular distribution - Fig. 1 : The circular distribution principle : A circular distributor and the simulation of radial circumferential distribution after pre-distribution of the melt - Fig. 2 : 5-layer fuel line Tube cross-section and detailed view - Fig. 3 : CV-t 5-layer co-extrusion die in part-sectional view ; the colored areas represent the five materials to be processed, i.e., their distribution. The numbers indicate the individual layer modules within the die - Fig. 4 : Simulation of the thermal condition within the CV-T die duringproduction of a 5-layer fuel line En ligne : https://drive.google.com/file/d/15cLGzZRbNieUu_wA4GFIDro4RFPp4Oup/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33174 [article]

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Effect of addition of styrene-ethylene/butylene-styrene and the type of mica on the mechanical properties of mica-filled polyethylene/polypropylene blends / Tetsuto Kajiyama in INTERNATIONAL POLYMER PROCESSING, Vol. XXXIII, N° 4 (08/2018)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXIII, N° 4 (08/2018) . - p. 564-573 Titre : Effect of addition of styrene-ethylene/butylene-styrene and the type of mica on the mechanical properties of mica-filled polyethylene/polypropylene blends Type de document : texte imprimé Auteurs : Tetsuto Kajiyama, Auteur ; T. Yasuda, Auteur ; T. Yamanaka ; K. Shimizu ; T. Shimizu ; E. Takahashi ; A. Ujiie ; K. Yamamoto ; T. Koike ; Y. Nishitani Année de publication : 2018 Article en page(s) : p. 564-573 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alliages polymères Composites polymères Composites thermoplastiques -- Moulage par injection Composites thermoplastiques -- Propriétés mécaniques Copolymère styrène-éthylène-butadiène Essais dynamiques Matières plastiques -- Extrusion Mica Microscopie électronique à balayage Polyéthylène Polypropylène Taille des particules Index. décimale : 668.4 Plastiques, vinyles Résumé : The mechanical properties of polyethylene (PE)/polypropylene (PP)/styrene-ethylene/butylene-styrene (SEBS)/mica composites were investigated as a model composition. Four types of mica with different particle sizes and different aspect ratios were used. These composites were extruded by a twin-screw extruder and subsequently injection molded, and their mechanical properties, including their tensile, bending, and impact properties were evaluated. The addition of mica to PE/PP/SEBS effectively improved its mechanical properties; the addition of SEBS as a compatibilizer likewise enhanced the mechanical properties compared with those of PE/PP composites without SEBS. The use of larger average particle size and higher aspect ratio mica, such as M-35, M-27, and P-33, effectively increased the tensile and bending properties of the PE/PP/SEBS/mica composites. The morphologies of the composites with an added mica as observed by scanning electron microscopy, showed good dispersion between the matrix polymer and the mica. Note de contenu : - EXPERIMENTS : Materials - Mixing of materials - Molding of composites - Mechanical tests of composites - SEM observations - RESULTS AND DISCUSSION : Effect of addition of SEBS and mica on mechanical properties - Effect of the addition of four types of mica on the tensile, bending, and impact properties - Morphology of PE/PP, PE/PP/SEBS, PE/PP/mica and PE/PP/SEBS/mica composites DOI : 10.3139/217.3568 En ligne : https://drive.google.com/file/d/1iVXN53SJLd6VGni0y4QO5Gy7sgVJjdrP/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30896 [article]

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Enhanced dispersion and mechanical behavior of polypropylene composites compounded using extension-dominated extrusion in INTERNATIONAL POLYMER PROCESSING, Vol. XXXV, N° 3 (07/2020)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXV, N° 3 (07/2020) . - p. 281-301 Titre : Enhanced dispersion and mechanical behavior of polypropylene composites compounded using extension-dominated extrusion Type de document : texte imprimé Année de publication : 2020 Article en page(s) : p. 281-301 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Charges (matériaux) Cisaillement (mécanique) Composites -- Propriétés mécaniques Composites polymères Dispersions et suspensions Extrudeuse bi-vis Graphène Le graphène est un cristal bidimensionnel (monoplan) de carbone dont l'empilement constitue le graphite. Il a été isolé en 2004 par Andre Geim, du département de physique de l'université de Manchester, qui a reçu pour cette découverte le prix Nobel de physique en 2010 avec Konstantin Novoselov. Il peut être produit de deux manières : par extraction mécanique du graphite (graphène exfolié) dont la technique a été mise au point en 2004, ou par chauffage d'un cristal de carbure de silicium, qui permet la libération des atomes de silicium (graphène epitaxié). Record en conduction thermique jusqu'à 5300 W.m-1.K-1. C'est aussi un matériaux conducteur. Matières plastiques -- Extrusion Nanoparticules Nanotubes Noir de carbone Polypropylène Rhéologie Index. décimale : 668.4 Plastiques, vinyles Résumé : The process of dispersing filler in polymer matrix is vital to the behavior of polymer composites. The current study involves understanding the extent of dispersion of filler by only varying the nature of mixing during the process. Identical polymer composite materials are processed via two different kinds of mixing sections on the screw in a twin-screw extruder, differing in the type and amount of stress they impose on the filler agglomerate. An aggressive (900) Kneading Block (KB) mixing section is compared with recently developed Extensional Mixing Elements (EMEs), which impart extension dominated mixing while KB imparts shear dominated mixing. Various EME geometries of different levels of aggressiveness were computationally studied and validated. Composites obtained from KB are compared with composites processed using five different EME geometries. Three composites of Polypropylene (PP) filled with carbon black, graphene nano platelets and carbon nanotubes were studied independently. Composites processed through EMEs display about an order of magnitude better dispersion of filler agglomerate over the composites processed through KB. In addition, enhanced modulus and yield stress is observed for composites processed through EMEs. An improvement of 63% to 266% in the strain achieved for EME processed composites is seen under biaxial film stretching. Note de contenu : - INTRODUCTION : Previous work - Extensional Mixing Element (EME) - Polymer systems of interest - COMPUTATIONAL VALIDATION OF EMEs OF VARYING DEGREES OF AGGRESSIVENESS - EXPERIMENTAL : Materials - Dispersion and liquid feeding - Extrusion - Injection molding - Shear rheometry - Scanning Electron Microscopy - Optical microscopy - Mechanical studies - Biaxial stretching - Differential Scanning Calorimetry - RESULTS AND DISCUSSION : Processability - Shear behavior - Dispersion performance - Optical analysis - Mechanical behavior DOI : https://doi.org/10.3139/217.3899 En ligne : https://drive.google.com/file/d/1_aeFg7HIJbuJL8hMm38x_T9BSX1ys3OB/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34494 [article]

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Exploring the applicability of a simplified fully coupled flow/orientation algorithm developed for polymer composites extrusion deposition additive manufacturing / Zhaogui Wang in INTERNATIONAL POLYMER PROCESSING, Vol. 37, N° 1 (2022)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 37, N° 1 (2022) . - p. 106-119 Titre : Exploring the applicability of a simplified fully coupled flow/orientation algorithm developed for polymer composites extrusion deposition additive manufacturing Type de document : texte imprimé Auteurs : Zhaogui Wang, Auteur Année de publication : 2022 Article en page(s) : p. 106-119 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Algorithmes Chlorure de polyvinyle Composites polymères Impression tridimensionnelle par dépôt par extrusion Polyamide 6 Polycarbonates Polypropylène Rhéologie Index. décimale : 668.4 Plastiques, vinyles Résumé : Prior literature employed a finite element based fully coupled algorithm that solved the flow/orientation coupling effects in extrusion deposition additive manufacturing, i.e., a key component for identifying the material properties of solidified deposited polymer composites. However, the complex iterative solution protocol reduces the computational capability of the algorithm. This paper simplifies the finite element based fully coupled algorithm by employing a scalar representation of the fourth order orientation tensor affected viscosity tensor. The revised code predicts similar fiber orientation results as compared to a related prior study. With the simplified fully coupled algorithm, effects of material deposition rate and fiber aspect ratio on a 2D planar large area extrusion deposition flow are explored, where the power law rheology model is employed for the flow simulation. Computed results show that an increased material deposition rate reduces the extrudate-swell ratio of the melt front and varies the local fiber orientation of the deposited bead especially near the flow region in contact with the substrate. Higher fiber aspect ratio enhances the principal fiber alignment of the extrusion and deposition flows, where the maximum local difference of the principal A 11 component is 23% with increasing fiber aspect ratio from 10 to 25. Note de contenu : - METHODOLOGY : Governing equations - Simplification of anisotropic viscosity tensor - EXTRUSION DEPOSITION FLOW MODELLING - NUMERICAL SIMULATION RESULTS : Material deposition rate - Fiber aspect ratio - Table 1 : Convergence performance of simplified algorithm when applyong different material deposition rates DOI : https://doi.org/10.1515/ipp-2021-4186 En ligne : https://drive.google.com/file/d/19eRubrMaV5RArAcDhshUrISduOrvwmpC/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38445 [article]

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Extraction des propriétés mécaniques locales d’un élastomère par nanoindentation : développement des protocoles et application / Clémence Fradet in MATERIAUX & TECHNIQUES, Vol. 105, N° 1 (2017)  

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Facile preparation of fluoroalkyl end-capped vinyltrimethoxysilane oligomer/a, w-dihydroxy-terminated poly(dimethylsiloxane) composite rubber : application to effective removal of fluorinated aromatic compound from aqueous methanol solution by fluoroalkylated silicone composite rubber / Katsumi Yamashita in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 1 (01/2021)  

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Feasibility of a polybisphenol A epichlorohydrin (PBAE)/antimony-doped tin oxide polymer composite as an NIR absorption coating for outdoor applications / Ju Yong Sim in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 4 (07/2018)  

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Influence of zinc oxide and titanium dioxide nanoparticules on kevlar/epoxy composites / Sawsan D. A. Shubbar in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES, Vol. 33, N° 3 (06/2023)  

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Infrared-responsive shape memory self-healing and fluorescent damage-indication anti-corrosion coatings for aluminum alloys / Xue-qi Zhang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 4 (07/2024)  

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Numerical analysis of polymer composites for actuation / Shivashankar Hiremath in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES, Vol. 30, N° 5-6 (12/2020)  

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Preparation and performance evaluation of SPEEK/polyaniline composite membrane for direct methanol fuel cell / A. S. Sultan in INTERNATIONAL POLYMER PROCESSING, Vol. XXXII, N° 1 (03/2017)  

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Preparation of PVDF/PVA composite films with micropatterned structures on light-cured 3D printed molds for hydrophilic modification of PVDF / Shengkai Li in INTERNATIONAL POLYMER PROCESSING, Vol. 39, N° 2 (2024)  

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