Rheological properties of long glass fiber filled polypropylene |
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| Institution: | 1. CRASP, Ecole Polytechnique, P.O. Box 6079, Stn Centre-Ville, Montreal, Que., Canada H3C 3A7;2. Laboratoire de Génie Mécanique et Matériaux (LG2M), Université de Bretagne Sud, rue de St Maudé, 56325 Lorient, France;1. School of Information Science, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan;2. Bio-medical Research Institute, Kyungpook National University Hospital, 130 Dongdeok-ro, Jung-gu, Daegu 41944, Republic of Korea;1. Department of Chemical Engineering, Virginia Tech, VA 24061, United States;2. Department of Mathematics, Virginia Tech, VA 24061, United States;1. Institute of Polymer Extrusion and Compounding, Johannes Kepler University Linz, Altenberger Str. 69, 4040 Linz, Austria;2. Profactor GmbH, Im Stadtgut A2, 4407 Steyr-Gleink, Austria;3. Kompetenzzentrum Holz GmbH, Altenberger Str. 69, 4040 Linz, Austria;4. Chair of Injection Moulding of Polymers, Department Polymer Engineering and Science, Montanuniversität Leoben, Otto-Glöckel Str. 2, 8700 Leoben, Austria;5. Hirschmann Automotive GmbH, Oberer Paspelsweg 6-8, 6830 Rankweil, Austria;6. Woco Industrietechnik GmbH, Hanauer Landstr. 16, 63628 Bad Soden-Salmünster, Germany;1. Department of Mechanical Engineering, University of Thessaly, Volos, Greece;2. Leibniz-Institut fuer Polymerforschung Dresden e. V. (IPF Dresden), Dresden, Germany;1. ThermoPlastic composites Research Center (TPRC), P.O. Box 770, 7500AT Enschede, The Netherlands;2. Faculty of Engineering Technology, Chair of Production Technology, University of Twente, P.O. Box 217, 7500AE Enschede, The Netherlands |
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| Abstract: | Long glass fiber-filled polypropylene (PP) composites are produced by pultrusion, and the extrudate is cut at different lengths producing composites containing long fibers of controlled length. The rheological properties of such composites in the molten state have been studied using different rheometers. A capillary rheometer has been constructed and mounted on a molding-injection machine. The shear viscosity of filled PP determined from the capillary rheometer, after corrections for entrance effects, was found to be very close to that of unfilled PP. However, large excess pressure losses at the capillary entrance were observed and these data have been used to obtain an apparent elongational viscosity. The apparent elongational viscosity was shown to be considerably larger than the shear viscosity for PP and filled PP, and it increased markedly with fiber length and fiber content. Rotational rheometers with a parallel-plate geometry were used to investigate the viscoelastic properties of these composites and their behavior was found to be non-linear, exhibiting a yield stress. A model is proposed to describe the shear viscosity from a solid-like behavior at low stresses to fluid-like behavior at high shear stresses taking into account fiber content and orientation. A modified model, proposed for elongational flow, describes relatively well the apparent elongational data. |
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