Processing of wood plastic composites: The influence of feeding method and polymer melt flow rate on particle degradation |
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| Authors: | Laura Teuber Holger Militz Andreas Krause |
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| Affiliation: | 1. Faculty of Forest Sciences and Forest Ecology, Section of Wood Biology and Wood Products, University of G?ttingen, G?ttingen, Germany;2. DFG Research Training Group GRK 1703 “Resource Efficiency in Interorganizational Networks”, University of G?ttingen, G?ttingen, Germany;3. Institute of Mechanical Wood Technology, Department of Wood Sciences, University of Hamburg, Hamburg, Germany |
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| Abstract: | Spruce wood particle (WP)/polypropylene (PP) compounds were prepared in an internal mixer using different rotor speeds. To analyze the effect of feeding method on particle degradation, WP and PP were either fed as dry‐blend or WP was fed into the PP melt. To prevent melt freezing, pre‐heated WP were used as comparison to cold WP. In addition, WPs were compounded with different grades of PP or high‐density polyethylene (HDPE) to analyze the effect of polymer matrix melt flow rate (MFR) on particle degradation. Mixing behavior of compounds containing 30% and 70% (w/w) WP depended on feeding method, represented by a changing relation of final torque values. Feeding as dry‐blend and using pre‐heated particles led to stronger WP degradation. Degradation decreased with increasing polymer MFR. For PP compounds, particle degradation was stronger when containing 70% WP, for HDPE the difference due to WP content was only marginal. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133, 43231. |
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| Keywords: | cellulose and other wood products composites degradation morphology thermoplastics |
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