Eucalyptus urophylla, Acacia mangium, and Pinus caribaea are the primary species for the wood industry in Vietnam. Wood residues of these species were used to reinforce high-density polyethylene (HDPE) composites. The flexural or bending property, impact strength and surface color were evaluated after exposure to accelerated ultraviolet weathering up to 2000 h. The weathered surface was characterized by scanning electron microscopy (SEM) and Fourier transform infrared (FTIR) spectroscopy. The results indicate that A. mangium/HDPE composites had the lowest color change and least fading, and remained stable after 1500 h exposure. FTIR spectroscopy showed that the oxidation of the composites increased in parallel with duration of exposure by assessing the concentration of carbonyl groups on the surfaces. SEM showed that all three species reinforced composites exhibited similar severe cracks after 1000 h; however, at the end of the weathering test, E. urophylla and P. caribaea composites were more severely cracked than A. mangium composites. A. mangium also had the highest flexural strength, impact strength and crystallinity during weathering. A. mangium is the most preferable among the three species to reinforce HDPE.

尾叶桉，马占相思和加勒比松是越南木材工业的主要树种。这些种类的木材残留物用于增强高密度聚乙烯（HDPE）复合材料。在暴露于加速紫外线风化下长达2000 h后，评估其弯曲或弯曲性能，冲击强度和表面颜色。风化的表面通过扫描电子显微镜（SEM）和傅里叶变换红外（FTIR）光谱进行表征。结果表明，A。mangium/ HDPE复合材料具有最低的颜色变化和最少的褪色，并且在暴露1500 h后仍保持稳定。FTIR光谱表明，通过评估表面上羰基的浓度，复合材料的氧化与暴露时间平行增加。扫描电镜显示，这三种增强复合材料在1000 h后均表现出相似的严重裂纹。然而，在风化试验结束时，尾叶E. urophylla和P. caribaea复合材料比A. mangium复合材料更严重地破裂。在风化过程中，芒果曲霉还具有最高的弯曲强度，冲击强度和结晶度。在三种物种中，最优选A. mangium来增强HDPE。