多壁奈米碳管強化環氧樹脂的製程與破壞韌性

Processing and Experimental Characterization of Fracture Toughness of MWCNT-Reinforced Epoxy-Matrix Composites

何施瑩(Shih-Ying He)

指導教授 ： 余念一

元智大學/工程學院/機械工程學系/碩士(2007年)

https://doi.org/10.6838/YZU.2007.00202

摘要

由於奈米碳管具有傑出的剛度與強度，因此被視為複合材料中理想的加強材料。本研究選擇環氧樹脂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。並比較加入不同重量百分比的多壁奈米碳管對於此環氧樹脂破壞韌性之影響，求得添加3 wt％多壁奈米碳管之環氧樹脂破壞韌性為純環氧樹脂的1.62倍。

實驗結果顯示，複合材料中的孔洞含量與碳管在環氧樹脂中分離與分佈狀態對破壞韌性具有顯著的影響。因此在試片準備過程中添加消泡劑幫助排除複合材料中的氣泡。同時，製程中超音波震盪配合充分攪拌複合材料，確保了複合材料中奈米碳管的分離與均勻分佈。實驗所得結果推定，添加奈米碳管對環氧樹脂破壞韌性有明顯提升。

關鍵字

奈米碳管 ； 環氧樹脂 ； 複合材料 ； 破壞韌性

並列摘要

Due to its excellent stiffness and strength, the carbon nanotube (CNT) is considered as an ideal candidate for the reinforcement in composite materials. In the present work, nanocomposites consisting of multi-wall carbon nanotubes (MWCNTs) embedded in an epoxy resin are fabricated and the composites’ fracture toughness is experimentally determined in accordance with the American Standard Test Method (ASTM) D5045 Standard Test Method for Fracture Toughness and Strain Energy Release Rate of Plastic Materials. The procedures for preparing MWCNT/epoxy composite specimens are developed. Furthermore, the effects of CNT weight fraction on the fracture toughness of MWCNT/epoxy composites are quantitatively characterized. Specifically, specimens containing 1 wt% and 3 wt% MWCNTs are prepared and tested. The fracture toughness of 3 wt%-MWCNT/epoxy composites is 1.62 times of that of unreinforced epoxy.

Our experiments indicate that the following two factors significantly affect the fracture toughness of MWCNT/epoxy composites: (1) formation of voids and (2) separation and distribution of MWCNTs. A degassing-agent is used in specimen preparation to help remove air bubbles from MWCNT/epoxy mixture. Sufficient time is spent in the sonication and manual stirring stage to ensure the separation and uniform distribution of MWCNTs in epoxy. Our conclusion is that adding MWCNTs into epoxy indeed increases the toughness of epoxy significantly.

並列關鍵字

nanotube ； epoxy ； composite ； fracture toughness

參考文獻

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