Rheology, mechanical and thermal properties of (C18-CNT/LDPE) nanocomposites / S. H. Abbasi in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 1 (03/2013)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVIII, N° 1 (03/2013) . - p. 3-13 Titre : Rheology, mechanical and thermal properties of (C18-CNT/LDPE) nanocomposites Type de document : texte imprimé Auteurs : S. H. Abbasi, Auteur ; A. A. Adesina, Auteur ; M. A. Atieh, Auteur ; U. Ul-Hamid, Auteur ; Ibnelwaleed A. Hussein, Auteur Année de publication : 2013 Article en page(s) : p. 3-13 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Copolymères greffés Etat fondu (matériaux) Matériaux hybrides -- Propriétés mécaniques Matériaux hybrides -- Propriétés thermiques Nanotubes Polyéthylène basse densité Polyéthylène greffé anhydride maléique Rhéologie Index. décimale : 668.4 Plastiques, vinyles Résumé : Nanocomposites of low density polyethylene (LDPE)/C18 modified multi wall carbon nanotubes (C18-CNT) were prepared by melt blending. The effect of C18-CNT loading and compatibilizer (maleic anhydride modified polyethylene, MAPE) on the morphology, mechanical, thermal and rheological properties of LDPE was studied. FE-SEM images of nanocomposites show reduced agglomeration of the in LDPE/C18-CNT in comparison with uncompatibilized C18-CNT. For uncompatibilized nanocomposites, yield strength and Young’s modulus increased with loading of C18-CNT. Ultimate strength, show improvement up to 2 wt% loading. However, percent elongation and toughness were reduced for C18-CNT at all loadings. Apart from elongation and toughness, addition of compatibilizer improved all mechanical properties as compared to pure LDPE and nanocomposites without compatibilizer. Percent crystallinity shows a correlation with Young’s modulus. Both, Young’s modulus and total crystallinity increased with C18-CNT loading and further increase with the incorporation of compatibilizer was observed. Results of phase angle suggest no presence of network. Also, addition of C18-CNT did not increase strain hardening, maintained extensional viscosity and time of break up to 1.5 s–1 Hencky rate. The C18 modifier is viewed to act similar to a long chain branching on linear polymers. The C18 modification of CNT resulted in reduced viscous and elastic properties of the composites. In turn, this is expected to lead to enhancement in the processing of these composites. Overall, compatibilized C18-CNT resulted in improved mechanical properties and better processing behavior. Note de contenu : - EXPERIMENTAL : Materials - Surface functionalization of MCNT with 1-octadecanol - Infrared spectroscopy - Thermal degradation analysis of functionalized carbon nanotubes - Melt processing and morphology characterization - Mechanical testing - Differential scanning calorimetry (DSC) - Rheological characterization - RESULTS AND DISCUSSION : Morphology of the LDPE/C18-CNT composites - Mechanical testing - Thermal characterization - Rheological characterization DOI : 10.3139/217.2587 En ligne : https://drive.google.com/file/d/1dfYXnF_-Iszt6pMVwUvTgBac7olnLk0O/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17759 [article]

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Thermorheology of polyethylene wax modified sulfur asphalt / M. A. Parvez in INTERNATIONAL POLYMER PROCESSING, Vol. XXX, N° 2 (05/2015)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXX, N° 2 (05/2015) . - p. 202-209 Titre : Thermorheology of polyethylene wax modified sulfur asphalt Type de document : texte imprimé Auteurs : M. A. Parvez, Auteur ; Al-Abdul Wahhab, Auteur ; Ibnelwaleed A. Hussein, Auteur ; M. Al-Mehthel, Auteur Année de publication : 2015 Article en page(s) : p. 202-209 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cires -- Applications industrielles Epaississants Liants Matériaux bitumineux Polyéthylène Revêtements (voirie) Rhéologie Soufre Index. décimale : 668.4 Plastiques, vinyles Résumé : The possibility of using polyethylene (PE) wax to modify the rheology of sulfur asphalt binders is investigated. In this study, two industrial wastes namely sulfur and PE wax are used to modify asphalt for pavement applications. Asphalt binders with different amounts of sulfur and wax content are prepared in a high shear blender and rheological tests were carried out in ARES rheometer. PE wax content was varied from 2 to 8 % and sulfur of up to 40 % is used in asphalt binder. Melt rheology is characterized by dynamic frequency sweep, temperature sweep and artificial ageing techniques. Pure and modified asphalt binders are also characterized by Fourier transform infrared spectra (FTIR). Improvement in the viscoelastic properties (G? and G?) of the sulfur asphalt binders is obtained due to the addition of PE wax. PE wax modification has reduced temperature susceptibility of sulfur asphalt and increased the upper performance temperature. In addition, this wax modification has increased the activation energy and the zero shear viscosity of sulfur asphalt. Optimum sulfur and PE wax contents of the asphalt binder are recommended. Utilization of PE wax and sulfur wastes in asphalt modification proved to enhance asphalt pavement life. Note de contenu : - EXPERIMENTAL : Materials - Sample preparation - Softening point test - Penetration test - FTIR measurements - Rolling thin film oven (RTFO) test - Rheological tests - RESULTS AND DISCUSSION : Softening point and penetration test results of selected binders - FTIR results of asphalt binders - Rheology results - Rolling thin film oven (RTFO) test DOI : 10.3139/217.2977 En ligne : https://drive.google.com/file/d/1GWIE73xRqBxc_vxYEFrleV7YM5YRxtrq/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23893 [article]

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