| Titre : |
Constitutive modeling of nonlinear rheological behavior of carbon nanotube-filled polypropylene nanocomposites |
| Type de document : |
texte imprimé |
| Auteurs : |
S. S. Pole, Auteur ; Avraam I. Isayev, Auteur ; J. Zhong, Auteur |
| Année de publication : |
2021 |
| Article en page(s) : |
p. 233-254 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Cisaillement (mécanique)
Matériaux hybrides
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.
Polypropylène
Rhéologie
|
| Index. décimale : |
668.4 Plastiques, vinyles |
| Résumé : |
The rheological behavior of multi-walled carbon nanotube (MWCNT)-filled polypropylene (PP) nanocomposites with different filler loadings was experimentally studied and simulated using constitutive modeling. Rheological behavior was characterized in small amplitude oscillatory shear (SAOS) flow, large amplitude oscillatory shear (LAOS) flow, startup of shear flow, steady shear flow, and stress relaxation after the imposition of a step shear strain. Virgin PP and PP with CNT loadings of 1, 3, and 5 wt% were used. The formation of a rheological percolation network was observed at these loadings. The Leonov and Simhambhatla-Leonov models were used to simulate the rheological behavior. In the linear region, the simulations provided good predictions of the experimental data for both the unfilled and filled PP. In the nonlinear region, the simulations also provided good results for the virgin PP and satisfactory results for the PP/1 wt%CNT nanocomposite under most flow conditions. However, for the other two nanocomposites the model showed mixed results. |
| Note de contenu : |
- SIMULATING RHEOLOGICAL BEHAVIOR USING THE LEONOV AND SIMHAMBHATLA-LENOV CES : Modeling SAOS - Modeling LAOS - Modeling startup and steady shear flow - Modeling stress relaxation after a step strain
- MATERIALS AND METHODS : Materials - Composite preparation - Rheological testing - Model parameters
- RESULTS AND DISCUSSION : SAOS - LAOS - Startup shear - Steady shear - Cox-Merz rule - Philippoff approach - Stress relaxation after a step strain
- Table 1 : Matrix modes for the virgin PP
- Table 2 : The parameters f, Zc, and Gp for the PP/CNT nanocomposites for the Leonov model
- Table 3 : The parameters f , Zc, Gp, and r for the PP/CNT nanocomposites for the Simhambhatla-Leonov model
- Table 4 : Particle modes for the PP/CNT nanocomposites for the Leonov model |
| DOI : |
https://doi.org/10.1515/ipp-2020-4055 |
| En ligne : |
https://drive.google.com/file/d/1klfXR0nsF7XyiVbq-SM8CCc7eIFZOJYa/view?usp=shari [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36367 |
in INTERNATIONAL POLYMER PROCESSING > Vol. 36, N° 3 (2021) . - p. 233-254
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