TY - JOUR
T1 - Investigation of the rheological properties of short glass fiber-filled polypropylene in extensional flow
AU - Férec, Julien
AU - Heuzey, Marie Claude
AU - Pérez-González, José
AU - de Vargas, Lourdes
AU - Ausias, Gilles
AU - Carreau, Pierre J.
N1 - Funding Information:
This work was supported by the France-Québec collaboration program and funded by NSERC (Natural Science and Engineering Research Council of Canada—CIAM program), and by CONACYT (CIAM 51837) and SIP-IPN (20060296-20070642) in México. The authors wish to thank Dr. G. Krotkine from Basell who kindly provided the materials used in this study. We are also thankful to Ms. M.J. Ramirez-Moreno, from the Instituto Politécnico Nacional in Mexico City (Mexico) for the Rheotens measurements, to Mr. J.R. R.-Siffert, from Pontificia Universidade Católica-RJ in Rio de Janeiro (Brazil) for helpful sample preparation and preliminary tests, and to Christophe Mobuchon for the Binding analysis of the slit die data. Finally, the authors wish to acknowledge Dr. S. Dagreou and Dr. F. Leonardi at the University de Pau for the use of their RME.
PY - 2009
Y1 - 2009
N2 - The behavior of short glass fiber - polypropylene suspensions in extensional flow was investigated using three different commercial instruments: the SER wind-up drums geometry (Extensional Rheology System) with a strain-controlled rotational rheometer, a Meissner-type rheometer (RME), and the Rheotens. Results from uniaxial tensile testing have been compared with data previously obtained using a planar slit die with a hyperbolic entrance. The effect of three initial fiber orientations was investigated: planar random, fully aligned in the stretching flow direction and perpendicular to it. The elongational viscosity increased with fiber content and was larger for fibers initially oriented in the stretching direction. The behavior at low elongational rates showed differences among the various experimental setups, which are partly explained by preshearing history and nonhomogenous strain rates. However, at moderate and high rates, the results are comparable, and the behavior is strain thinning. Finally, a new constitutive equation for fibers suspended into a fluid obeying the Carreau model is used to predict the elongational viscosity, and the predictions are in good agreement with the experimental data.
AB - The behavior of short glass fiber - polypropylene suspensions in extensional flow was investigated using three different commercial instruments: the SER wind-up drums geometry (Extensional Rheology System) with a strain-controlled rotational rheometer, a Meissner-type rheometer (RME), and the Rheotens. Results from uniaxial tensile testing have been compared with data previously obtained using a planar slit die with a hyperbolic entrance. The effect of three initial fiber orientations was investigated: planar random, fully aligned in the stretching flow direction and perpendicular to it. The elongational viscosity increased with fiber content and was larger for fibers initially oriented in the stretching direction. The behavior at low elongational rates showed differences among the various experimental setups, which are partly explained by preshearing history and nonhomogenous strain rates. However, at moderate and high rates, the results are comparable, and the behavior is strain thinning. Finally, a new constitutive equation for fibers suspended into a fluid obeying the Carreau model is used to predict the elongational viscosity, and the predictions are in good agreement with the experimental data.
KW - Constitutive equation
KW - Elongational viscosity
KW - Fiber suspensions
KW - Fiber-filled thermoplastics
UR - http://www.scopus.com/inward/record.url?scp=58149178744&partnerID=8YFLogxK
U2 - 10.1007/s00397-008-0309-9
DO - 10.1007/s00397-008-0309-9
M3 - Artículo
SN - 0035-4511
VL - 48
SP - 59
EP - 72
JO - Rheologica Acta
JF - Rheologica Acta
IS - 1
ER -