Morphological and rheological properties of PET/clay nanocomposites |
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Authors: | Abbas Ghanbari Marie-Claude Heuzey Pierre J. Carreau Minh-Tan Ton-That |
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Affiliation: | 1. Center for Applied Research on Polymers and Composites (CREPEC), Chemical Engineering Department, Ecole Polytechnique de Montreal, PO Box 6079, Stn Centre-Ville, Montreal, QC, H3C 3A7, Canada 2. Automotive Portfolio, National Research Council Canada, 75 Mortagne Blvd, Boucherville, QC, J4B 6Y4, Canada
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Abstract: | This work investigates the effects of clay chemistry and concentration on the morphology and rheology of polyethylene terephthalate (PET)/clay nanocomposites. The complex viscosity of the PET nanocomposites exhibited a more solid-like behavior, in contrast to the matrix that had a frequency-independent viscosity. In addition, at high frequencies where the behavior of the matrix should be dominant, a lower complex viscosity of the nanocomposites was observed due to PET degradation in the presence of the organoclays. The high-frequency data were used to estimate the matrix degradation using the Maron–Pierce equation. The apparent molecular weight of the PET matrix was found to decrease from 65 kg/mol for the neat PET to 30 kg/mol for a PET nanocomposite containing 8 wt% Cloisite®; 30B. The apparent yield stress in the nanocomposites was determined using the Herschel–Bulkley model. Yield stress increased with the level of exfoliation and clay concentration, from ~0 to 166 Pa when the clay concentration increased from 2 to 8 wt%. |
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