Hung Ke-Chang, Chang Wen-Chao, Xu Jin-Wei, Wu Tung-Lin, Wu Jyh-Horng
Department of Forestry, National Chung Hsing University, Taichung 402, Taiwan.
Tainan District Agricultural Research and Extension Station, Council of Agriculture, Tainan 712, Taiwan.
Polymers (Basel). 2021 Aug 11;13(16):2681. doi: 10.3390/polym13162681.
The purpose of this study is to compare the characteristics of wood-plastic composites (WPCs) made of polypropylene (PP) and wood fibers (WFs) from discarded stems, branches, and roots of pomelo trees. The results show that the WPCs made of 30-60 mesh WFs from stems have better physical, flexural, and tensile properties than other WPCs. However, the flexural strengths of all WPCs are not only comparable to those of commercial wood-PP composites but also meet the strength requirements of the Chinese National Standard for exterior WPCs. In addition, the color change of WPCs that contained branch WFs was lower than that of WPCs that contained stem or root WFs during the initial stage of the accelerated weathering test, but the surface color parameters of all WPCs were very similar after 500 h of xenon arc accelerated weathering. Scanning electron microscope (SEM) micrographs showed many cracks on the surfaces of WPCs after accelerated weathering for 500 h, but their flexural modulus of rupture (MOR) and modulus of elasticity (MOE) values did not differ significantly during weathering. Thus, all the discarded parts of pomelo trees can be used to manufacture WPCs, and there were no significant differences in their weathering properties during 500 h of xenon arc accelerated weathering.
本研究的目的是比较由聚丙烯（PP）和柚树废弃茎、枝、根中的木纤维（WFs）制成的木塑复合材料（WPCs）的特性。结果表明，由茎中30 - 60目的木纤维制成的木塑复合材料比其他木塑复合材料具有更好的物理、弯曲和拉伸性能。然而，所有木塑复合材料的弯曲强度不仅与商用木塑复合材料相当，而且符合中国室外木塑复合材料国家标准的强度要求。此外，在加速老化试验初期，含枝木纤维的木塑复合材料的颜色变化低于含茎或根木纤维的木塑复合材料，但在500小时氙弧加速老化后，所有木塑复合材料的表面颜色参数非常相似。扫描电子显微镜（SEM）照片显示，在加速老化500小时后，木塑复合材料表面出现许多裂纹，但其弯曲断裂模量（MOR）和弹性模量（MOE）值在老化过程中没有显著差异。因此，柚树的所有废弃部分都可用于制造木塑复合材料，并且在500小时氙弧加速老化过程中它们的老化性能没有显著差异。
