- 學位論文
單方向排列多壁奈米碳管強化環氧樹脂之斷裂韌度
Fracture Toughness of Aligned MWCNT-Reinforced Epoxy-Matrix Composites
摘要
本研究以多壁奈米碳管添加入環氧樹脂內之複合材料進行破壞韌性的實驗。因為奈米碳管具有優越的機械性質，所以被廣泛使用於複合材料中的加強材。不過一般研究並未對奈米碳管進行方向性排列，本研究特別藉由介電泳技術操縱奈米碳管在環氧樹脂中具有單一方向性的排列與均勻的分佈，探討不同重量百分比的奈米碳管對環氧樹脂破壞韌性的影響。 實驗結果純環氧樹脂的平均破壞韌度為0.33 MPa∙m1/2，而加入單一方向排列多壁奈米碳管後的複合材料，1 wt%和3 wt%多壁奈米碳管複合材料平均破壞韌度分別增加了72%和116.2%。而1 wt%和3 wt%隨機分佈多壁奈米碳管複合材料平均破壞韌度分別增加了39.3%和67.9%。實驗結果顯示經排列後的多壁奈米碳管能夠大幅加強環氧樹脂的破壞韌度。
並列摘要
In the present work, epoxy-matrix composites reinforced by aligned multi-walled carbon nanotubes (MWCNTs) are prepared and the fracture toughness is experimentally characterized. Since that CNTs have excellent mechanical properties, they are widely used in the reinforcement of the composite materials. Most existing works do not align carbon nanotubes (CNTs) as it is quite challenging to manipulate the nanotubes. of the present work align CNTs within the epoxy matrix by dielectrophoresis and study the toughening effects and CNT weight fraction effect on composites’ fracture toughness. The fracture toughness is determined by the American Standard Test Method (ASTM) D5045 Standard Test Method for Fracture Toughness and Strain Energy Release Rate of Plastic Materials. The average fracture toughness of 1wt% and 3wt% aligned MWCNT/epoxy is 72% and 116.2% higher than that of neat epoxy, respectively. The average fracture toughness of 1wt% and 3wt% random MWCNT/epoxy is 39.3% and 67.9% higher than that of neat epoxy, respectively. It is concluded that MWCNTs can increase the fracture toughness significantly after being aligned by dielectrophoresis.