Static bending and toughness of wood polymer composites (yellow birch and basswood) |
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Authors: | Marc H Schneider Svetlana Vasic Stig Lande Jonathan G Phillips |
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Institution: | (1) Faculty of Forestry and Environmental Management, University of New Brunswick, PO BOX 44555, Fredericton, NB, E3B 6C2, Canada;(2) Centre for structural testing, National Institute for materials and structures, 11000 Belgrade, Bulevar vojvode Misica 43, Serbia and Montenegro;(3) Wood Polymer Technologies ASA, Bjornasvegen 5, 1590 Moss, Norway |
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Abstract: | Wood polymer composites (WPC) were made from basswood and yellow birch using six cell lumen type polymer formulations. The study was designed to get insight into the influence of wood density and polymer formulation on certain WPC mechanical properties. Small specimens were tested for toughness, stiffness, hardness and bending strength using standard ASTM methods. Results showed that stronger and stiffer polymers produce tougher and stronger WPC, but the effect is small. Thus, there is a wide range of polymer properties which produce useful WPC properties. Study of the fracture surfaces using Scanning Electron Microscopy (SEM) showed that WPC made with different polymers fractured differently and polymer containing a coupling agent bonded to the cell wall. However the cell wall bonding had no noticeable influence on WPC mechanical properties. |
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