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Paridokht Mahallati, Hojjat Mahi Hassanabadi, Manfred Wilhelm, Denis Rodrigue
Rheological characterization of thermoplastic elastomers (TPE) based on PP and recycled EPDM

Appl. Rheol. 26:3 (2016) 33503 (7 pages)

The rheological behavior of thermoplastic elastomers (TPE) based on 50/50 recycled ethylenepropylene-diene monomer (r-EPDM)/polypropylene (PP) was studied to determine the effect of feeding strategy when preparing these blends using twin-screw extrusion. In particular, small and large deformation characterizations have been performed to better understand the relationships between sample preparation and final properties of the blends. It was found that small changes in blend morphology (particle size and interfacial adhesion) are better distinguished in rheological properties (melt state) under large deformation (LAOS and step shear) compared to small deformation (SAOS).

Cite this publication as follows:
Mahallati P, MahiHassanabadi H, Wilhelm M, Rodrigue D: Rheological characterization of thermoplastic elastomers (TPE) based on PP and recycled EPDM, Appl. Rheol. 26 (2016) 33503.

D. Rodrigue, M.-C. Heuzey, C. Dubois, D. De Kee
Prof. Pierre J. Carreau 65th Birthday Symposium, 2004, Montreal, Canada

Appl. Rheol. 15:1 (2005) 48

Cite this publication as follows:
Rodrigue D, Heuzey M-C, Dubois C, DeKee D: Prof. Pierre J. Carreau 65th Birthday Symposium, 2004, Montreal, Canada, Appl. Rheol. 15 (2005) 48.

A.Martinez-Ruvalcaba, E. Chornet, D. Rodrigue
Dynamic rheological properties of concentrated Chitosan solutions

Appl. Rheol. 14:3 (2004) 140-147

A detailed analysis of the dynamic flow properties of chitosan in solution at different temperatures (25 - 45 C), chitosan concentration (0.5% - 2.0%), solvent type (acetic, lactic, and hydrochloric acid), and ionic strength (0 and 0.2M NaCl) has been undertaken. The storage modulus, G', loss modulus, G'' and complex viscosity, h* have been determined over a wide range of frequencies and the results are presented using master curves. For the conditions studied, at low frequencies chitosan solutions show a constant complex viscosity which decreases as frequency increases. Likewise, storage modulus, G' and loss modulus, G'' increase as frequency increases with G'' being always greater than G' indicating that viscous effects are more important than elastic effects. For modelling the oscillatory-shear results we used the generalized Maxwell model. Two empirical equations were used to correlate the data: Cox-Merz rule for viscosity and Laun's rule for primary normal stress difference. Both relations were found to represent our data for the experimental conditions studied.

Cite this publication as follows:
Martinez-Ruvalcaba A, Chornet E, Rodrigue D: Dynamic rheological properties of concentrated Chitosan solutions, Appl. Rheol. 14 (2004) 140.


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