塑木複合材料(wood plastic composites, WPC)被認為是至今取代非生物可降解高分子的材料之一。 WPC 有著許多優點，如高生物降解性、高強度和彎曲性能，以及低成本等。現今環保意識抬頭，政府的政策逐漸傾向以可再生性材料取代不可再生性材料，因此 WPC 吸引了工業界的大量投入。這之中 WPC 最大的問題是它的耐用性，近年來為了將 WPC 應用於日常生活中，學者們開始投入研究以改善其耐用性。本研究探討木粉之粒徑尺寸及添加劑對 WPC 的影響。本實驗將木粉過篩後(目數為 20, 80, 120)與聚丙烯(polypropylene, PP)混合製備成 WPC，這之中加入 2wt％PP-g-MA 及 1wt％硼酸鋅來改善 WPC 的性質。發現 WPC 樣品的機械性能與粒徑差異無關，然而有添加 PP-g-MA 的樣品其拉伸強度增加了 64%。我們也對 WPC 進行了循環吸水試驗和真菌試驗。實驗結果發現 WPC 的粒徑和添加劑，對循環吸水有著較大的影響，與具較大粒徑且不摻入 PP-g-MA的樣品相比，粒徑小並添加 2 wt％PP-g-MA 的 WPC 樣品有損壞較少。同時，在真菌試驗中，有無添加硼酸鋅的影響非常大，但結果顯示木粉粒徑與真菌攻擊沒有直接關係。當樣品有添加硼酸鋅時，
樣品比較不會被真菌侵蝕。此外，在所有相關測試完成之後，使用 SEM 進行表面裂縫的觀察和粗糙度的分析。

Wood plastic composites (WPC) is considered as one of the advanced materials to
replace the use of non-degradable polymeric materials. Number of advantages are offered,including high biodegradability, great strength and flexural properties, and less costly materials. Therefore, WPC has attracted many manufacturing industries and its renewability has become one of the reasons for government to change non-renewable
composite materials into the renewable one. However, the durability has always been questionable in the area of composites manufacturing. Therefore, current study tried to investigate the durability of WPC to be feasible materials for real-life applications. Presented research investigated the effect of different wood flour particle size and additives on the durability of wood plastic composite (WPC). WPC was prepared by blending wood flour (20, 80, 120 mesh) with polypropylene (PP), 2 wt% PP-g-MA and 1wt% zinc borate were added in the formulation to improve the properties of WPC. Mechanical properties of WPC samples were found to be independent on particle size difference. However, the presence of PP-g-MA increased the tensile strength up to 64%. WPC samples were also subjected to cyclic moisture absorption tests and fungal decay tests. Here, the effect of particle sizes and additives were more pronounced and accumulation of damage was discovered after the exposure of cyclic test to WPC samples. WPC with smaller particle size and 2 wt% PP-g-MA possessed less damage compared to the ones with larger particle size and no incorporation of PP-g-MA. Meanwhile, in the fungal decay test zinc borate influenced more than any variables involved. Mass loss caused by fungi was lesser when zinc borate was present and the result of the fungal decay test was independent of particle size difference. In addition, SEM followed by roughness analysis were conducted to analyze the surface cracks after all involved tests.

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