Morphological and mechanical properties of thermoplastic elastomers based on recycled high density polyethylene and recycled natural rubber / A. Fazli in INTERNATIONAL POLYMER PROCESSING, Vol. 36, N° 2 (2021)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 36, N° 2 (2021) . - p. 156-164 Titre : Morphological and mechanical properties of thermoplastic elastomers based on recycled high density polyethylene and recycled natural rubber Type de document : texte imprimé Auteurs : A. Fazli, Auteur ; D. Rodrigue, Auteur Année de publication : 2021 Article en page(s) : p. 156-164 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alliages polymères Alliages polymères -- propriétés mécaniques Caoutchouc Caractérisation Elastomères thermoplastiques Elastomères thermoplastiques -- Propriétés mécaniques Elastomères thermoplastiques -- Propriétés physiques Formulation (Génie chimique) Morphologie (matériaux) Polyéthylène haute densité Produits et matériaux recyclés Index. décimale : 668.4 Plastiques, vinyles Résumé : In this work, thermoplastic elastomers (TPE) are produced by melt mixing of recycled high-density polyethylene (RHD) with two types of off-the-road (OTR) ground tire rubber (GTR). Non-regenerated (NR) and regenerated (RR) rubbers are used to investigate the effect of GTR concentration and regeneration on the blends properties containing up to 90 wt.% GTR. The blend morphology is studied by scanning electron microscopy (SEM) to show incompatibility and low interfacial adhesion between RHD and GTR (NR and RR) especially above 40 wt.% RR. This behavior is attributed to the GTR regeneration process and agglomeration of RR particles with lower surface area and affinity toward RHD compared with NR. In all the compounds, the mechanical properties in tension of RR blends were lower than for NR blends, which is attributed to the degradation of the GTR backbone chains lowering the molecular weight (MW) during the regeneration process. Also, NR has a more important effect on impact strength improvement due to its higher crosslinked structure making the particles more deformable/elastic to absorb the mechanical energy before crack initiation. The experimental results also show that 80 wt.% GTR is the optimum concentration for the production of low cost and eco-friendly TPE based on recycled materials. Note de contenu : - EXPERIMENTAL : Materials - Processing - Characterization - RESULTS AND DISCUSSION : Processability - Morphology - Mechanical Properties - Physical Properties - Table 1 : Coding and formulation of the samples produced - Table 2 : Parameters related to the processability of the compounds produced DOI : https://doi.org/10.1515/ipp-2020-4006 En ligne : https://drive.google.com/file/d/18CmU0Wybroybj7EF3V-XcNsgHX5o5ZLJ/view?usp=shari [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36359 [article]

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Rheological and molecular investigations of polyethylene degradation in a batch mixer / E. Twite-Kabamba in INTERNATIONAL POLYMER PROCESSING, Vol. XXV, N° 4 (09/2010)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXV, N° 4 (09/2010) . - p. 297-303 Titre : Rheological and molecular investigations of polyethylene degradation in a batch mixer Type de document : texte imprimé Auteurs : E. Twite-Kabamba, Auteur ; D. Rodrigue, Auteur Année de publication : 2010 Article en page(s) : p. 297-303 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Ecoulement élongationnel Malaxeurs et mélangeurs Matériaux -- Fatigue Polyéthylène Polyéthylène basse densité Polymères -- Détérioration Rhéologie Index. décimale : 668.9 Polymères Résumé : In this study, polyethylene degradation is related to its thermo-mechanical history from processing in a batch mixer. A focus is made on the rheological and molecular properties of the polyethylene subjected to different processing conditions by changing the temperature, the rotor speed and the time of process. The results indicate that while shear rheological properties changed slightly, the elongational properties were substantially modified, especially the maximum stress and the elongation at break. Due to the formation of macroradicals while processing, macromolecular changes were characterized in terms of molecular weight distribution and the results represent a balance between rates of chain scission and chain branching. It was found that the main parameter to characterize the degradation behaviour was the input power. DOI : 10.3139/217.2365 En ligne : https://drive.google.com/file/d/1aiT5bd8vlg2BA_q2lUoV2Iqkb51UYHcD/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9826 [article]

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The effect of post-extrusion conditions in ribbon extrusion of polymer blend / D. Ramirez-Arreola in INTERNATIONAL POLYMER PROCESSING, Vol. XXI, N° 2 (05/2006)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXI, N° 2 (05/2006) . - p. 121-131 Titre : The effect of post-extrusion conditions in ribbon extrusion of polymer blend Type de document : texte imprimé Auteurs : D. Ramirez-Arreola, Auteur ; D. Rodrigue, Auteur ; R. Gonzàlez-Nùnez, Auteur ; H. Padilla-Lopez, Auteur Année de publication : 2006 Article en page(s) : p. 121-131 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Blends of high density polyethylene and polystyrene were produced via ribbon extrusion to study the effect of post-extrusion conditions on the ribbon final dimensions and morphology. An experimental setup was designed to measure the stretching force as a function of draw ratio and water contact distance for blends of 3, 6 and 9% PS in HDPE. Numerical simulations of the non-isothermal process using Matlab were in good agreement with the experimental data only when both viscous and elastic effects are included. The results show that both draw ratio and water contact distance have a definite influence on the final dimensions of the ribbon and the stretching force. It was found that deformation of the dispersed phase increases with draw ratio, but decreases with water contact distance. DOI : 10.3139/217.0055 En ligne : https://drive.google.com/file/d/1OWf_HCXdMZm4eM8PwZiaIeHPdUWvXQoK/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2905 [article]

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