Rheological properties of wood polymer composites at high shear rates |
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| Institution: | 1. Koszalin University of Technology, Faculty of Mechanical Engineering, Raclawicka 15-17, 75-620 Koszalin, Poland;2. University of Warmia and Mazury in Olsztyn, Faculty of Technical Sciences, Oczapowskiego 11, 10-719 Olsztyn, Poland;3. School of Mechanical and Materials Engineering, Washington State University, Pullman, WA, United States;1. Department of Fiber and Polymer Technology, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden;2. BiMac Innovation, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden;3. Laboratory of Paper Engineering and Polymer Materials (LEPAMAP) Group, Department of Chemical Engineering, University of Girona, Campus Montilivi, Building PI, 17071 Girona, Spain;4. Composite Centre Sweden, Luleå University of Technology, SE-971 87 Luleå, Sweden;5. Wallenberg Wood Science Center (WWSC), KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden;1. University of Queensland, School of Chemical Engineering, St. Lucia, Queensland, Australia;2. Promiko AB, Lomma, Sweden;3. Norske Skog Paper Mills (Australia) Ltd, Boyer, Tasmania, Australia;1. Thünen Institute of Wood Research, Leuschnerstraße 91c, 21031 Hamburg, Germany;2. Institute of Mechanical Wood Technology, Department of Wood Sciences, University of Hamburg, Leuschnerstraße 91c, 21031 Hamburg, Germany |
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| Abstract: | This paper presents the rheological properties of wood-polymer composites (WPC) with a polypropylene (PP) matrix in the corrected shear rate range from approx. 20 s?1 to 150 000 s?1. Tests were conducted using a capillary rheometer and a rheological head of the author's construction, for which the working element is a thermoplastic injection moulding machine. The constructed tool was found to be very useful, especially for the determination of the processing characteristics of WPC composites containing a large particle-size filler. It was observed that the rheological properties of wood-polymer composites in the shear rate range of up to several thousand s?1 significantly depended on the filler content of the polymer matrix; at the same time, at higher shear rate, a clear decrease in the effect of the wood filler content on the viscosity of the composites and on the flow behaviour, as described by the power law, took place. |
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| Keywords: | Wood-polymer composites (WPC) High shear rates Rheological properties |
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