多壁奈米碳管強化高密度聚乙烯的破壞韌性

Fracture Toughness of MWCNT-Reinforced HPDE-Matrix Composites

郭凡瑜(Fan-yu Kuo)

指導教授 ： 余念一

元智大學/工程學院/機械工程學系/碩士(2012年)

https://doi.org/10.6838/YZU.2012.00028

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％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1.08倍。

複合材料中的孔洞含量與碳管在高密度聚乙烯中分離與分佈狀態對破壞韌性具有顯著的影響。因此在本次實驗以高密度聚乙烯粉末直接攪和多壁式奈米碳管製程使得製程簡化且提升分散效果。同時，搭配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，添加奈米碳管對高密度聚乙烯破壞韌性有所提升。

關鍵字

奈米碳管 ； 高密度聚乙烯 ； 破壞

並列摘要

Because of its excellent physical and mechanical properties, multi-walled carbon nanotubes (MWCNTs) have been widely used in various high-tech industries. The carbon nanotube (CNT) is praised highly for the 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.

Our experiments show that the following two factors play important roles in the fracture toughness of MWCNT/HPDE composites: (1) formation of voids and (2) separation and distribution of MWCNTs. In the present work, HPDE powder is directly blended with MWCNTs and sufficient time is spent in the sonication and stirring stage to ensure the separation and uniform distribution of MWCNTs in HPDE. Our conclusion is that adding MWCNT into HPPDE indeed increases the toughness of HDPE.

並列關鍵字

carbon nanotube ； high density polyethylene

參考文獻

何施瑩 (2007)，多壁奈米碳管強化環氧樹脂的製程與破壞韌性，元智大學機械研究所，碩士論文

Anderson, T. L. (1991), Fracture Toughness – Fundamentals and Applications, CRC Press, Inc.

Avic, A., Arikan, H., and Akdemir, A. (2003), “Fracture behavior of glass fiber reinforces polymer composite,” Cement and Concrete Research, 34, pp. 429-434.

Avci, A., Akdemir, A. and Arikan, H. (2004) “Mixed-mode fracture behavior of glass fiber reinforced polymer concrete,” Cement and Concrete Research, 35, pp. 243-247.

Chan, M. K. V., and WILLIAMS, J. G. (1981), “Plane Strain Fracture Toughness Testing of High Density Polyethylene,” Polymer Engineering & Science, 15, pp. 1019-1026.