EFFECT OF WOOD SPECIES ON UV WEATHERING RESISTANCE OF WOOD-PLASTIC COMPOSITES
Keywords:
Wood flour/polyethylene, Eucalyptus urophylla, , Acacia mangium,, Pinus caribaea,, weathering, surface propertiesAbstract
The goal of this study was to evaluate accelerated weathering performance of high-density polyethylene (HDPE) -wood flour (WF) composites. The wood flour was obtained from three different plantation species including Eucalyptus urophylla, Acacia mangium, and Pinus caribaea. The samples of WPC were exposed in a QUV accelerated weathering test for a total duration of 2000 h. The flexural strength, impact strength and surface color of the samples were tested. The weathered surface was characterized with Scanning electron microscopy (SEM) and Fourier transform infrared (FTIR) spectroscopy. The results indicate that: (1) the flexural strength and impact strength of the composites were decreased with increasing exposure time of weathering. The highest value of MOE, MOR and impact strength was seen in the Acacia mangium/HDPE composite; (2) The change of color and lightness of WPCs during weathering increased with increasing exposure time. The speed of change depends on wood species. WPC oxidation weather which is assessed by the concentration of carbonyl groups increased parallel with exposure duration. WPC filled with Acacia mangium wood flour had higher ∆E* and ∆L* values after weathering compared to those of filled with Eucalyptus urophylla and Pinus caribae
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