| Titre : |
Tensile, rheological and morphological characterizations of multi-walled carbon nanotube/polypropylene composites prepared by microinjection and compression molding |
| Type de document : |
texte imprimé |
| Auteurs : |
Gulstan S. Ezat, Auteur ; Adrian L. Kelly, Auteur ; Mansour Youseffi, Auteur ; Phil D. Coates, Auteur |
| Année de publication : |
2022 |
| Article en page(s) : |
p. 45-53 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Composites à fibres -- Moulage par compression
Composites à fibres -- Moulage par micro-injection
Composites à fibres de carbone
Composites à fibres de carbone -- Propriétés mécaniques
Dispersions et suspensions
Matériaux hybrides
Morphologie (matériaux)
Nanotubes de carbone à parois multiplesUn nanotube de carbone multifeuillet est constitué de plusieurs feuillets de graphènes enroulés les uns autour des autres. Il existe deux modèles pour décrire la structure des nanotubes multifeuillets :
- le modèle poupée russe: les plans de graphène sont arrangés en cylindres concentriques ;
- le modèle parchemin: un seul feuillet de graphène est enroulé sur lui-même, comme une feuille de papier.
Rhéologie
Traction (mécanique)
|
| Index. décimale : |
668.4 Plastiques, vinyles |
| Résumé : |
Polypropylene (PP) reinforced with 2 and 4Â wt% of multi-walled carbon nanotubes (MWNT) were melt-blended in twin screw extruder and then molded by compression or micromolding process. The impact of injection speed on the surface morphology, rheological and tensile characteristics was investigated by using a scanning electron microscope, parallel plate rheometry, and tensiometry. Results showed that the tensile properties of micro-molded specimens were remarkably higher than those of the compression molded sheets. Compared to compression molded sheets, micromolded specimens demonstrated up to 40 and 244% higher tensile stiffness and yield strength, respectively, most likely due to the alignment of polymer chain segments in the flow direction induced during the micromolding process. It was observed that the fast filling speed caused a drop in the tensile properties of the nanocomposites and polymer. Rheological examination revealed that the presence of a rheological percolation network in the nanocomposites produced by micromolding and the fast injection speed was beneficial for establishing the percolated network. Morphological examination revealed that the size of nanotube agglomerations that appeared in micromolded specimens was up to five times smaller than in compression molded sheets and the agglomeration size decreased with the increase of the injection speed. |
| Note de contenu : |
- EXPERIMENTAL : Materials - Nanocomposite preparation and molding - Measurement of tensile characteristics - Rheological analysis - Morphological characterization
- RESULTS AND DISCUSSION : Tensile properties - Rheological analyzes - Dispersion of MWNT |
| DOI : |
https://doi.org/10.1515/ipp-2021-4156 |
| En ligne : |
https://drive.google.com/file/d/1E0uzUvti86xTq18f8Ez7VPoGMZsI9rij/view?usp=share [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38440 |
in INTERNATIONAL POLYMER PROCESSING > Vol. 37, N° 1 (2022) . - p. 45-53
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Tensile, rheological and morphological characterizations of multi-walled carbon nanotube/polypropylene composites prepared by microinjection and compression molding in INTERNATIONAL POLYMER PROCESSING, Vol. 37, N° 1 (2022)
