Time-evolution of the structure of organoclay/polypropylene nanocomposites and application of the time/temperature superposition principle

Riadh Zouari 1 Trystan Domenech 1 Bruno Vergnes 1 Edith Peuvrel-Disdier 1
1 CEMEF - Centre de Mise en Forme des Matériaux
Abstract : We investigated the rheological properties of nanocomposites composed of polypropylene, organoclay, and maleic anhydride grafted polypropylene in small amplitude oscillatory shear. Samples were prepared in two steps: a masterbatch was first obtained by melt extrusion and then diluted into polypropylene using an internal mixer. Three formulations were investigated. The measurement of the storage and loss moduli evolution with time showed that these materials were not stable: the nanostructure obtained after steady shear continuously changed with time, due to the disorientation of the clay platelets and the build-up of a 3D network. The kinetics of the structure build-up (followed via the melt yield stress) showed a two-step process. This feature was found to be valid whatever the nanocomposite formulation. Such evolution of the structure is generally assumed to violate the time-temperature superposition principle. We demonstrate in this paper that the time-temperature equivalence always exists if the same nanostructure is probed. This was achieved by using different annealing times for different temperatures or annealing the samples at the highest temperature before measuring at lower values. The time-temperature equivalence evidences that the temperature does not induce any chemical change within the material, whose properties remain governed by the same physical phenomena.
Keywords : extrusion melt processing nanocomposites nanofabrication polymers Rheology Nanocomposite Organoclay Structure Time-temperature principle clay elastic moduli
Type de document :
Article dans une revue
Liste complète des métadonnées

Littérature citée [22 références]  Voir  Masquer  Télécharger
https://hal-mines-paristech.archives-ouvertes.fr/hal-00700469
Contributeur : Magalie Prudon <>
Soumis le : jeudi 13 avril 2017 - 11:21:24
Dernière modification le : lundi 12 novembre 2018 - 10:59:43

Fichier

2012-Zouari-JOR.pdf
Fichiers produits par l'(les) auteur(s)

Identifiants

Collections

INSTITUT-TELECOM | ENSMP | ENSMP_CEMEF | PSL | PARISTECH

Citation

Riadh Zouari, Trystan Domenech, Bruno Vergnes, Edith Peuvrel-Disdier. Time-evolution of the structure of organoclay/polypropylene nanocomposites and application of the time/temperature superposition principle. Journal of rheology, American Institute of Physics, 2012, 56 (4), pp.725-734. ⟨10.1122/1.4708602⟩. ⟨hal-00700469⟩

Exporter

BibTeX TEI DC DCterms EndNote

Partager

Métriques

Consultations de la notice

264

Téléchargements de fichiers

141

Contact

support.ccsd.cnrs.fr
hal.support@ccsd.cnrs.fr
Logo CCSD