Effect of coupling agent and ground tire rubber content on the properties of natural fiber polymer composites / N. Nikpour in INTERNATIONAL POLYMER PROCESSING, Vol. XXXI, N° 4 (08/2016)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXI, N° 4 (08/2016) . - p. 463-471 Titre : Effect of coupling agent and ground tire rubber content on the properties of natural fiber polymer composites Type de document : texte imprimé Auteurs : N. Nikpour, Auteur ; Denis Rodrigue, Auteur Année de publication : 2016 Article en page(s) : p. 463-471 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caoutchouc Chanvre et constituants Le chanvre ou chanvrier (Cannabis sativa L.) est la seule espèce du genre botanique Cannabis. Ce terme latin est souvent utilisé aussi comme nom vernaculaire pour distinguer les variétés de chanvre cultivé à usage industriel des variétés de cannabis à usage récréatif ou médical. C'est une espèce de plante annuelle, de la famille des Cannabaceae. La graine de chanvre s'appelle le chènevis. Composites à fibres végétales Composites à fibres végétales -- Extrusion Composites à fibres végétales -- Propriétés mécaniques Polyéthylène haute densité Polyéthylène maléate Réaction de couplage Index. décimale : 668.4 Plastiques, vinyles Résumé : In this work, high density polyethylene (HDPE)/hemp fiber composites were produced by extrusion compounding followed by injection molding. In particular, the effect of ground tire rubber (GTR) and coupling agent (maleated polyethylene, MAPE) content was studied to modify the mechanical properties of these natural fiber composites (NFC). From the samples produced, a complete characterization was performed including morphology, density, hardness, as well as mechanical properties in tension, flexion, and impact. The results indicate that substantial improvement in NFC impact strength occurred after GTR addition, while tensile and flexural moduli/strengths decreased. On the other hand, the addition of a coupling agent was able to improve adhesion between each phase resulting in better composite properties. Overall, the final properties of the composites represent a balance between elasticity/toughness from GTR and rigidity/strength from hemp and MAPE. From the data obtained, a regression model for different properties is presented to design/control the final properties of these composites. Note de contenu : - MATERIALS - COMPOUNDING - CHARACTERIZATION - EMPIRICAL MODELS - RESULTS AND DISCUSSION : Morphology - Mechanical properties - Properties modeling - Goodness of fit and prediction of the model - Refinement and analysis of the model - Tensile strength - Tensile modulus - Elongation at break - Flexural modulus - Impact strength - Model application - Tensile strentgh - Tensile modulus - Flexural modulus - Impact strength DOI : 10.3139/217.3240 En ligne : https://drive.google.com/file/d/1zZRYj6-Ssra4zKWhikpVGkUFhthSg-_R/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26808 [article]

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Effect of feeding strategy on the mechanical properties of PP/recycled EPDM/PP-G-MA blends / P. Mahallati in INTERNATIONAL POLYMER PROCESSING, Vol. XXIX, N° 2 (05/2014)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXIX, N° 2 (05/2014) . - p. 280-286 Titre : Effect of feeding strategy on the mechanical properties of PP/recycled EPDM/PP-G-MA blends Type de document : texte imprimé Auteurs : P. Mahallati, Auteur ; Denis Rodrigue, Auteur Année de publication : 2014 Article en page(s) : p. 280-286 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alliages polymères Alliages polymères -- propriétés mécaniques Anhydride maléique Caractérisation Compoundage Elastomères thermoplastiques Etat fondu (matériaux) Ethylène-propylène-diène monomère Matières plastiques -- Extrusion Matières plastiques -- Moulage par injection Matières plastiques -- Recyclage Morphologie (matériaux) Polypropylène Index. décimale : 668.9 Polymères Résumé : In this work, thermoplastic elastomers based on polypropylene (PP) and recycled ethylene-propylene-diene monomer (r-EPDM) blends with polypropylene-graft-maleic anhydride (PP-g-MA) as modifier (0 to 8?wt.%) were prepared by melt compounding via twin-screw extrusion followed by injection molding. In particular, the effects of material composition and feeding strategies were studied. The morphological and mechanical properties of the blends were investigated by using scanning electron microscopy (SEM), tensile, flexural, impact, density and hardness tests. The results indicate that good dispersion and compatibility between PP and r-EPDM particles was obtained and that incorporation of r-EPDM leads to significant increase in PP impact strength. Finally, the feeding order of each component in the extruder was found to modify substantially the final morphology of the blend, thus having a direct influence on their mechanical properties. Note de contenu : - EXPERIMENTAL : Materials - Blend preparation - Characterization - RESULTS AND DISCUSSION : Morphologie - Mechanical properties DOI : 10.3139/217.2855 En ligne : https://drive.google.com/file/d/14Gw1NkgW444kEa1WozKrun3OoPs7SNc3/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21323 [article]

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Effect of feeding strategy on the properties of PP/recycled EPDM blends / P. Mahallati in INTERNATIONAL POLYMER PROCESSING, Vol. XXX, N° 2 (05/2015)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXX, N° 2 (05/2015) . - p. 276-283 Titre : Effect of feeding strategy on the properties of PP/recycled EPDM blends Type de document : texte imprimé Auteurs : P. Mahallati, Auteur ; Denis Rodrigue, Auteur Année de publication : 2015 Article en page(s) : p. 276-283 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alliages polymères -- propriétés mécaniques Elastomères thermoplastiques -- Extrusion Elastomères thermoplastiques -- Moulage par injection Essais dynamiques Ethylène-propylène-diène monomère Extrudeuse bi-vis Morphologie (matériaux) Polypropylène Résistance au chocs Technique de la production Index. décimale : 668.4 Plastiques, vinyles Résumé : In this work, thermoplastic elastomers (TPE) were produced based on polypropylene (PP) and recycled ethylene-propylene-diene monomer (r-EPDM) through twin-screw extrusion followed by injection molding. In particular, the effect of different feeding strategies (component introduction order and position along the screw) and r-EPDM content (0, 20, 35, 50 and 65% wt.) were studied. From the materials produced, morphological and mechanical characterizations were carried out. The results show that feeding strategy has a substantial influence on dispersion and compatibility between PP and r-EPDM. The main result is that r-EPDM can significantly increase PP impact strength (495%) with optimized processing conditions. Note de contenu : - EXPERIMENTAL : Materials - Blend preparation - Characterization - RESULTS AND DISCUSSION : Morphology - Mechanical properties DOI : 10.3139/217.3008 En ligne : https://drive.google.com/file/d/16k3RaqJMLISOkklPIKf_-PCB-G1Xt14a/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23910 [article]

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Effect of nano-particles on flow and recovery of polymer nano-composites in the melt state / H. M. Hassanabadi in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 2 (05/2013)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVIII, N° 2 (05/2013) . - p. 151-158 Titre : Effect of nano-particles on flow and recovery of polymer nano-composites in the melt state Type de document : texte imprimé Auteurs : H. M. Hassanabadi ; Denis Rodrigue Année de publication : 2013 Article en page(s) : p. 151-158 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Argile 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. Composites Copolymère éthylène acétate de vinyle Etat fondu (matériaux) Matériaux hybrides Montmorillonite Rhéologie Index. décimale : 668.9 Polymères Résumé : The effect of nano-particle geometry on flow and recovery of polymer melts based on ethylene vinyl acetate (EVA) was investigated. Two nano-particles, calcium carbonate (CaCO3) and montmorillonite clay, were used with concentrations between 2.5 and 15 % by weight. First, by using small amplitude oscillatory shear and transient step shear tests, the linear and non-linear response of the nano-composites was studied. Then, to examine the structure recovery, the same behavior was studied on pre-sheared samples. The linear and non-linear data revealed that the effect of nano-particles in material flow is more important for anisometric particles which can be attributed to their ability to form a fractal structure controlling the rheological properties while spherical particles are not able to form such networks. Recovery experiments revealed that while nano-composites containing spherical particles have relatively similar response in subsequent tests, the rheological properties decreased significantly for platelet particles. The recovery results were also interpreted based on a filler-network mechanism and the reduction of the nano effect for anisometric particles was related to the breakdown of the filler network. These observations were validated by morphological investigations. Note de contenu : - EXPERIMENTS : Materials and samples preparation - Morphological characterization - Rheological analysis - RESULTS AND DISCUSSION : Morphological characterization - Dynamic data - Shear transient response - Recovery properties under flow DOI : 10.3139/217.2631 En ligne : https://drive.google.com/file/d/1Lc85bqDPopAM8EaN8XAKUMb5otrrWia-/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18424 [article]

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Preparation and characterization of reduced graphene oxide based natural rubber nanocomposites / F. Shahamatifard in INTERNATIONAL POLYMER PROCESSING, Vol. XXXV, N° 5 (11/2020)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXV, N° 5 (11/2020) . - p. 492-502 Titre : Preparation and characterization of reduced graphene oxide based natural rubber nanocomposites Type de document : texte imprimé Auteurs : F. Shahamatifard, Auteur ; Denis Rodrigue, Auteur ; K. Park, Auteur ; S. Frikha, Auteur ; Fred Mighri, Auteur Année de publication : 2020 Article en page(s) : p. 492-502 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse spectrale Caoutchouc Caractérisation Elasticité Graphite Matériaux hybrides Matériaux hybrides -- Propriétés mécaniques Matériaux hybrides -- Propriétés thermiques Oxyde de graphène Réticulation (polymérisation) Thermocinétique Thermogravimétrie Vulcanisation Index. décimale : 668.4 Plastiques, vinyles Résumé : This work describes the effect of reduced graphene oxide (RGO) addition in natural rubber (NR). Firstly, RGO was synthesized based on the improved Hummer's method then characterized by Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and thermogravimetric analysis (TGA) to confirm that the RGO surface contains hydroxyl, epoxy, and carboxyl functional groups to improve graphene interaction with the NR matrix. In a second step, the synthesized RGO was predispersed in NR latex using the co-coagulation technique then added at different amounts (0 to 2 parts per hundred rubber (phr)) to a basic NR formulation and compounded in an internal mixer. The results show that the crosslink density of the developed NR/RGO nanocomposites increased by 65 % for RGO concentration of 2.0 phr. For the same RGO concentration, a significant increase in tensile strength (53 %) and Young's modulus (31 %) were also observed. Finally, a significant improvement (26 %) of the thermal conductivity was obtained with the addition of only 0.5 phr of RGO. Note de contenu : - EXPERIMENTAL : Materials - Preparation of reduced graphene oxide - Pre-dispersion of reduced graphene oxide in natural rubber latex using the co-coagulation technique - Preparation of natural rubber-based nanocomposites - CHARACTERIZATION : Mechanical properties and thermal behavior - Vulcanization and crosslink density - Fourier Transform infrared Spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS - RESULTS AND DISCUSSION : Graphite and graphene oxide characterization - Curing and properties of the basic NR matrix and its modified NR/G and NR/RGO nanocomposites DOI : https://doi.org/10.3139/217.3987 En ligne : https://drive.google.com/file/d/1a0Ao7lnJdrys6Mvy-R_f1VteBFq2qXtV/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35071 [article]

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Production of thermoplastic elastomers based on recycled PE and ground tire rubber : morphology, mechanical properties and effect of compatibilizer addition / Y.-H. wang in INTERNATIONAL POLYMER PROCESSING, Vol. XXXIII, N° 4 (08/2018)  

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The effect of physical aging on the mechanical properties of raw, treated and compatibilized coir fibers-based polyisoprene bio-composites / C. A. Kakou in INTERNATIONAL POLYMER PROCESSING, Vol. XXXV, N° 5 (11/2020)  

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