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Thermal, morphological, rheological and deformation under mechanical loading analyses of recycled polyethylene terephthalates / Kivanc Bakir in INTERNATIONAL POLYMER PROCESSING, Vol. 37, N° 3 (2022)
[article]
Titre : Thermal, morphological, rheological and deformation under mechanical loading analyses of recycled polyethylene terephthalates Type de document : texte imprimé Auteurs : Kivanc Bakir, Auteur ; Deniz Aydemir, Auteur ; Timucin Bardak, Auteur ; Murat Emre Kartal, Auteur Année de publication : 2022 Article en page(s) : p. 287-302 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse thermique
Déformations (mécanique)
Eléments finis, Méthode des
Imagerie numérique
Matières plastiques -- Propriétés thermiques
Matières plastiques -- Recyclage
Morphologie (matériaux)
Polyéthylène téréphtalate
RhéologieIndex. décimale : 668.4 Plastiques, vinyles Résumé : This study aims at determining the mechanical deformation behavior of recycled poly (ethylene terephthalate) (r-PET) with digital image correlation (DIC) and finite element method (FEM), and to investigate the morphological, thermal, and rheological properties of r-PETs. Waste bottles were collected in trash bins and granulated with a cutter. Neat PET (n-PET) was also was used to determine accurately the changes in the properties of r-PET. PET test samples were obtained by injection molding at 260, 265, 270, and 275 °C. DIC and FEM were conducted to detect the deformation behavior of the PETs under mechanical loading. The data showed that the behavior of n-PETs and r-PETs were similar, and the stress distribution was found to densify in various areas for both PETs. The mechanical properties generally increased with increasing processing temperature, the best mechanical properties being obtained for thPETs processed at 275 °C. Scanning electron microscopy (SEM) analysis showed that the morphology of all the PETs were similar. Thermal stability was also found to be similar. The rheological moduli of n-PET processed at 260 °C were the highest, while processing r-PET at 275 °C improved its rheological properties. Note de contenu : - MATERIALS AND METHODS : Materials - Preparation of PET test samples - Methods
- RESULTS AND DISCUSSION : Mechanical properties of the PETs and the deformation analysis with DIC and FEM under mechanical testing - Morphological analysis - Thermal properties - Rheological properties
- Table 1 : TGA Data for n-PET and r-PET processed at different temperaturesDOI : https://doi.org/10.1515/ipp-2021-4165 En ligne : https://drive.google.com/file/d/13qTzJI31__flej8f48rzLT0zepAVN-Da/view?usp=shari [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37907
in INTERNATIONAL POLYMER PROCESSING > Vol. 37, N° 3 (2022) . - p. 287-302[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23738 - Périodique Bibliothèque principale Documentaires Disponible Thermal, tensile, electrical, dynamic mechanical thermal and rheological properties of polyvinylidene fluoride and fluoroelastomer composites filled with carbon black / M. D. Moezzi in INTERNATIONAL POLYMER PROCESSING, Vol. XXXIV, N° 1 (03/2019)
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Titre : Thermal, tensile, electrical, dynamic mechanical thermal and rheological properties of polyvinylidene fluoride and fluoroelastomer composites filled with carbon black Type de document : texte imprimé Auteurs : M. D. Moezzi, Auteur ; Mohammed Karrabi, Auteur ; Y. Jahani, Auteur Année de publication : 2019 Article en page(s) : p. 111-120 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alliages polymères
Analyse thermique
Analyse thermomécanique dynamique
Caractérisation
Charges (matériaux)
Composites thermoplastiques -- Propriétés électriques
Composites thermoplastiques -- Propriétés mécaniques
Composites thermoplastiques -- Propriétés thermiques
Conduction électrique
Elasticité
Elastomères
Fluoropolymères
Noir de carbone
Percolation
Polyfluorure de vinylidène
Rhéologie
Traction (mécanique)
Transition vitreuseIndex. décimale : 668.4 Plastiques, vinyles Résumé : The present work was focused on studying the effects of different CB loadings on the rheological, thermal, tensile, dynamic mechanical and electrical properties of polyvinylidenefluoride (PVDF) and FKM composites. To these ends, the CB grade and method chosen for compound preparation were CB (N330) and melt mixing, respectively. The composites were melt blended with CB at 190 °C in an internal mixer, after which the properties of filled and unfilled composites were compared. The presence of CB improved the mechanical properties, such as the Young's modulus and tensile strength, and increased thermal stability given the high thermal stability of CB and the interaction between the CB particles and the polymer matrices. The dynamic mechanical thermal analysis (DMTA) showed the glass transition temperatures of the composites. The analysis also revealed that the area under the loss tangent (tan δ) peak decreased and that the tan δ temperature of the rubber phase increased with CB loading. The increase in the electrical conductivity of the composites under different CB loadings was also examined, and the percolation threshold of conductive thermoplastic vulcanizate composite based on conductive CB was observed. The effect of CB and its content on rheological behavior of the PVDF/FKM blends was studied and the experimental data was correlated by a physical model named General Equation Model (GEM). A relation between rheology and conductivity of the blends with filler percolation was found. Note de contenu : - EXPERIMENTAL : Materials - Sample preparation and composition - Composites characterization
- RESULTS AND DISCUSSION : Thermal analysis - DSC - Mechanical properties - DMTA - Electrical properties - Rheological analysisDOI : 10.3139/217.3588 En ligne : https://drive.google.com/file/d/10vtDNZwLGTJBuTNtHl0VwfEQc0opEGwM/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31921
in INTERNATIONAL POLYMER PROCESSING > Vol. XXXIV, N° 1 (03/2019) . - p. 111-120[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 20669 - Périodique Bibliothèque principale Documentaires Disponible Thermoplastic blends of PP and waste rubber powder : Effects of compatibilizer on tensile properties, thermal behavior and decomposition kinetics / J.-N. Yan in INTERNATIONAL POLYMER PROCESSING, Vol. XXXIII, N° 4 (08/2018)
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Titre : Thermoplastic blends of PP and waste rubber powder : Effects of compatibilizer on tensile properties, thermal behavior and decomposition kinetics Type de document : texte imprimé Auteurs : J.-N. Yan, Auteur ; S.-B. Nie, Auteur ; X.-H. Huang ; G.-X. Ding ; J.-B. Zhu Année de publication : 2018 Article en page(s) : p. 460-470 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alliages polymères
Alliages polymères -- propriétés mécaniques
Aminopropyltriethoxysilane
Analyse thermique
Anhydride maléique
Caoutchouc
Caoutchouc -- Recyclage
Caractérisation
Cinétique chimique
Ethylène
Greffage (chimie)
Polypropylène
Poudres
Stabilité thermiqueIndex. décimale : 668.4 Plastiques, vinyles Résumé : To improve the performances of waste rubber powder filled polypropylene (PP/WRP) blends, WRP was modified by γ-aminopropyltriethoxysilane (APTES) via mechano-chemical method, and then maleic anhydride (MAH) grafted PP (mPP) and MAH grafted ethylene-α-octene copolymer (mEOC) were chosen as the interfacial compatibilizers. The PP/WRP blends were prepared by melt-compounding and compression, and their morphological structures, tensile properties and thermal behavior were investigated carefully. Results showed that modification of APTES decreased the surface energy of WRP and facilitated its compatibility to PP. Both mPP and mEOC could further enhance their interfacial bonding and mPP was superior to mEOC in increasing the tensile strength and elastic modulus. Thermal analysis revealed relative lower melting temperature and crystallinity but higher activation energy for PLA/WRP blends in comparison to pristine PP. Note de contenu : - EXPERIMENTAL : Raw materials - Fabrication of samples - Characterization
- RESULTS AND DISCUSSION : Characterization on the modification of WRP - Morphological structures - Tensile properties - Melt behavior - Thermal stability - Kinetics analysis on the thermal decomposition
- Table 1 : Elemental compositions of the surface of uWRP and WRP by XPS analysis
- Table 2 : Surface energy (γ) and its dispersing (γd) and polar (γp) components for the investigated materials
- Table 3 : Calculated interfacial energies (γAB) for all the possible pairs
- Table 4 : Characteristic parameters of pristine PP and the blends
- Table 5 : Reaction order (n) and activation energy (E) for various samples calculated by Kissinger and Carrasco methodsDOI : 10.3139/217.3439 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30885
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Code-barres Cote Support Localisation Section Disponibilité 20077 - Périodique Bibliothèque principale Documentaires Disponible Toughening of polylactide by bio-based and petroleum-based thermoplastic elastomers / Y. Meyva in INTERNATIONAL POLYMER PROCESSING, Vol. XXX, N° 5 (11/2015)
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Titre : Toughening of polylactide by bio-based and petroleum-based thermoplastic elastomers Type de document : texte imprimé Auteurs : Y. Meyva, Auteur ; Cevdet Kaynak, Auteur Année de publication : 2015 Article en page(s) : p. 593-602 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alliages polymères
Alliages polymères -- propriétés mécaniques
Analyse thermique
Biopolymères -- Propriétés mécaniques
Elastomères thermoplastiques
Essais de résilience
Essais dynamiques
Matières plastiques -- Extrusion
Polyesters
Polylactique, AcideL'acide polylactique (anglais : polylactic acid, abrégé en PLA) est un polymère entièrement biodégradable utilisé dans l'alimentation pour l'emballage des œufs et plus récemment pour remplacer les sacs et cabas en plastiques jusqu'ici distribués dans les commerces. Il est utilisé également en chirurgie où les sutures sont réalisées avec des polymères biodégradables qui sont décomposés par réaction avec l’eau ou sous l’action d’enzymes. Il est également utilisé pour les nouveaux essais de stent biodégradable.
Le PLA peut-être obtenu à partir d'amidon de maïs, ce qui en fait la première alternative naturelle au polyéthylène (le terme de bioplastique est utilisé). En effet, l'acide polylactique est un produit résultant de la fermentation des sucres ou de l'amidon sous l'effet de bactéries synthétisant l'acide lactique. Dans un second temps, l'acide lactique est polymérisé par un nouveau procédé de fermentation, pour devenir de l'acide polylactique.
Ce procédé conduit à des polymères avec des masses molaires relativement basses. Afin de produire un acide polylactique avec des masses molaires plus élevées, l'acide polylactique produit par condensation de l'acide lactique est dépolymérisé, produisant du lactide, qui est à son tour polymérisé par ouverture de cycle.
Le PLA est donc l’un de ces polymères, dans lequel les longues molécules filiformes sont construites par la réaction d’un groupement acide et d’une molécule d’acide lactique sur le groupement hydroxyle d’une autre pour donner une jonction ester. Dans le corps, la réaction se fait en sens inverse et l’acide lactique ainsi libéré est incorporé dans le processus métabolique normal. On obtient un polymère plus résistant en utilisant l'acide glycolique, soit seul, soit combiné à l’acide lactique.Index. décimale : 668.9 Polymères Résumé : The purpose of this study was to improve toughness of inherently very brittle polylactide (PLA) without sacrificing strength and thermal properties, so that biopolymer PLA could be used in engineering applications. For this purpose, PLA was blended with various amounts of two different thermoplastic elastomers; TPU (petroleum-based thermoplastic polyurethane) and TPE (bio-based thermoplastic polyester). Melt blending and specimen shaping were achieved by using a twin-screw extruder and injection molder, respectively. SEM analysis indicated that TPU and TPE were immiscible forming fine and uniform round domains in the PLA matrix. It was revealed that rubber-toughening mechanisms of TPU and TPE were very effective. For instance, using only 10 phr of TPU or TPE increased Charpy impact toughness of PLA more than 300 %, while increases in fracture toughness (KIC and GIC) values of PLA were as much as 35 % and 130 %, respectively. Other mechanical tests (tension, flexure, hardness) and thermal analyses (DSC) revealed that there were no significant detrimental effects of using 10 phr TPU or TPE on the engineering performance of PLA. Note de contenu : - EXPERIMENTAL : Materials, blending and shaping - Testing and analysis
- RESULTS AND DISCUSSION : Morphology and distribution of the elastomeric domains - Melt flow behavior of the blends - Strength, modulus and hardness of the blends - Ductility and toughness of the blends - Toughening mechanisms - Thermal transition temperatures and crystallinity of the blendsDOI : 10.3139/217.3113 En ligne : https://drive.google.com/file/d/1ZeqryfiWoGctlt0vgbf925CTQRaQKUH4/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24822
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Code-barres Cote Support Localisation Section Disponibilité 17557 - Périodique Bibliothèque principale Documentaires Disponible Towards gradient structures in fluorinated acrylate and polyacrylate blend emulsions / Zhaoxia Yin in SURFACE COATINGS INTERNATIONAL, Vol. 101.4 (08-09/2018)
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Titre : Towards gradient structures in fluorinated acrylate and polyacrylate blend emulsions Type de document : texte imprimé Auteurs : Zhaoxia Yin, Auteur ; Yiding Shen, Auteur ; Guoyan Ma ; Xiaorong Wang ; Hua Xin ; Mu Liu Année de publication : 2018 Article en page(s) : p. 210-214 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse spectrale
Analyse thermique
Caractérisation
Energie de surface
Fluoropolymères
Granulométrie
Polyacrylates
Polymères en émulsion
RevêtementsIndex. décimale : 667.9 Revêtements et enduits Résumé : The effect of film formation temperature on the internal structure of self-organised films of fluoroacrylate/polyacrylate emulsions is described. Six fluorinated polyacrylate emulsions bearing varying fluorinated monomers were prepared and blended with the same polyacrylate emulsion. The blends were dried at 30°C, 45°C and 60°C. The minimum film formation temperature (MFFT) was tested by the MFFT-BAR-60 model instrument. The surface properties and morphologies of the blends on both the film-air (F.-A) and the film-glass (F-G) interfaces were characterised by contact angle, particle size distribution and scanning electron microscopy. The elemental composition and structure of films across the section were analysed by scanning electron microscope with energy dispersive X-ray spectroscopy (SEM-EDX) and X-rayphotoelectron spectra (XPS) analysis. Note de contenu : - EXPERIMENTAL : Materials - Preparation of blended emulsions - Characterisation
- RESULTS AND DISCUSSION : ATR-FTIR spectroscopy of BE-1 and BE-6 - Particle size distribution - DSC analysis of sample films - Surface free energy measurements - Fractured surface morphology of BE-1 film - SEM-EDX spectrogram - XPS spectra of the emulsion surface
- TABLES : 1. Sample designation and composition of the fluorinated acrylate emulsions - 2. Summary of Tg and MFFT results for samples 1-7 - 3. Surface free energies of BE1-6 films at different film formation temperatures
- FIGURES : 1. ATR-FTIR spectar of BE-1 and BE-6 - 2. Particle size and distribution of emulsions sample 1, 3, 7 and BE-1 and BE-6 - 3. DSC thermograms of different samples - 4. The fractured surfacemorphology of the BE-1 film at different film formation temperatures - 5. SEM-EDX spectra of F distribution at fractured section of BE-1 film at difference film formation temperatures - 6. XPS spectra of F-G and F-A of BE-1 film at different temperatures and pattern of the fitting peak treatment for the XPS spectra of C 1s signals for the F-G interface at 60°CEn ligne : https://drive.google.com/file/d/1z08THNPC3a9XbAC_4hCbnct5tyoxN1wg/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30939
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