- 學位論文
奈米碳管/高密度聚乙烯的破壞韌性實驗
Experimental Characterization of Fracture Toughness of CNT/HDPE Composites
摘要
奈米碳管擁有傑出的機械性質，因此被視為複合材料中理想的加強材料。本研究選擇高密度聚乙烯添加多壁奈米碳管之複合材料，依照ASTM規範D5045進行此複合材料之破壞韌性實驗，求得添加0.5 wt％及1 wt%多壁奈米碳管之高密度聚乙烯破壞韌性為純高密度聚乙烯的1.05及1.16倍。 多壁奈米碳管在高密度聚乙烯中分離與分佈狀態及複合材料中的氣泡含量對破壞韌性有顯著的影響。因此本實驗以高密度聚乙烯粉末直接攪和多壁奈米碳管，同時，搭配超音波震盪配合攪拌機充分混合複合材料，確保了複合材料中奈米碳管的分離與均勻分佈，且在加溫過程中抽真空以減少複合材料裡氣泡殘留。實驗所得結果推定，添加奈米碳管對高密度聚乙烯破壞韌性有所提升，且隨著重量百分比的增加，提升效果更為顯著。
並列摘要
Because of its excellent mechanical properties, the carbon nanotube (CNT) is an ideal reinforcement in composite materials. The present work develops processing for nanocomposites consisting of multi-wall carbon nanotubes (MWCNTs) embedded in a high-density polyethylene (HPDE). The composite’s fracture toughness is experimentally determined according to the American Standard Test Method (ASTM) D5045 Standard Test Method for Fracture Toughness and Strain Energy Release Rate of Plastic Materials. The experimental results indicate that the average fracture toughness of 0.5 wt%- and 1 wt%-MWCNT/ HDPE composites increases 5.7% and 16.7% in comparison with that of pure HDPE. The separation and distribution of MWCNTs and formation of voids affect prominently the fracture toughness of MWCNT/HPDE composites. In the present work, HPDE powders are directly mixed with MWCNTs and sufficient time is spent in the sonication and stirring stage to ensure the separation and uniform distribution of MWCNTs in HPDE. Moreover, vacuuming to reduce bubbles left in the composites in the heating process. The conclusion is that adding MWCNTs into HPPDE increases the fracture toughness of HDPE. Furthermore, the effect is more pronounced with an increase in weight fraction of MWCNT.