[article]
| Titre : |
Dynamically vulcanized nanocomposite thermoplastic elastomers based on EPDM/PP (rheology & morphology) |
| Type de document : |
texte imprimé |
| Auteurs : |
Ghasem Naderi, Auteur ; P. G. Lafleur, Auteur ; C. Dubois, Auteur |
| Année de publication : |
2007 |
| Article en page(s) : |
p. 284-292 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Index. décimale : |
668.9 Polymères |
| Résumé : |
This study examines the rheological and morphological properties of dynamically vulcanized nanocomposite thermoplastic elastomers (TPV nanocomposites) based on PP/EPDM. Rubber contents of 20, 40, and 60 % were used with polypropylene of different viscosities at 2wt.% of nanoclay. We performed rheological and morphological characterizations on the nanocomposites using X-ray diffraction, transmission electron microscopy, scanning electron microscopy and rheometry in small amplitude oscillatory shear. The effects of polypropylene viscosity, maleic anhydride grafted polypropylene (PPMA), and composition were also investigated. The storage modulus (G') of the TPV nanocomposites (without PPMA) containing 20, 40, and 60 % rubber significantly increased in comparison with similar but unfilled samples and also a further increase in the G0 from the incorporation of the PPMA in the samples. The agglomeration of the clay considerably decreased when the rubber content was increased in the TPV nanocomposites. The yield stress of the prepared TPV nanocomposite, based on a low-viscosity PP, increased more than that of the sample from high viscosity PP. The TPV nanocomposites containing 20, 40 and 60 % EPDM exhibited a strong elastic modulus that tended to level off (plateau) at low shear rates. These results were attributed to strong interfacial interactions between the nanoclay and TPV matrix and, also, the existence of the physical three-dimensional network structure formed between the cured rubber particles, as evidenced by the morphological features of the samples. A Carreau-Yasuda law with yield stress and a linear viscoelastic model, taking into account the maximum packing volume (Phi m) were used to describe the melt linear viscoelastic properties of the TPV nanocomposites. |
| DOI : |
10.3139/217.1017 |
| En ligne : |
https://drive.google.com/file/d/1673yLXkmeY_PMCL6_0VP1Moes1SC8UNq/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2706 |
in INTERNATIONAL POLYMER PROCESSING > Vol. XXII, N° 3 (07/2007) . - p. 284-292
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Dynamically vulcanized nanocomposite thermoplastic elastomers based on EPDM/PP (rheology & morphology) in INTERNATIONAL POLYMER PROCESSING, Vol. XXII, N° 3 (07/2007)
