Effects of Geometrical Shapes of Wood Particles on the Mechanical and Water-Uptake Properties of the Resulting Wood/High Density Polyethylene Composites
Waste wood particles of different shapes were used to reinforce high density polyethylene (HDPE) to prepare high performance wood/plastic composites (WPC). The wood particles showed a needle-, flake-, strand-, and powder-shape, respectively. The mechanical and water-uptake properties of the composites manufactured using extrusion were tested. The wood needles/HDPE composites (WN-WPC) exhibited slightly higher mechanical strengths and lower density than the composites with the other shapes of wood particles. When the flake-, strand-, and powder-shaped wood particles were replaced by wood needles, the flexural, tensile and impact strengths were increased approximately by 4.24%, 7.61%, and 16.6% on average, respectively, and the density was decreased by about 7.34%. The length and width of WPC specimens changed little when soaked in water, with the thickening on the edge area only. WN-WPC performed the best waterproof stability. Based on the experimental results, the wood needles with lager length-to-diameter ratio would be the most suitable for producing high performance WPC.
Zhenyu Du and X.B Sun
H. G. Wang et al., "Effects of Geometrical Shapes of Wood Particles on the Mechanical and Water-Uptake Properties of the Resulting Wood/High Density Polyethylene Composites", Advanced Materials Research, Vols. 113-116, pp. 674-678, 2010