環境效應對改質奈米碳管/環氧樹脂複合材料之機械性質研究

Environmental Effects on Mechanical Properties of Modified CNT/Epoxy Resin Composites

何恭維(Kung-Wei Ho)

指導教授 ： 葉銘泉

國立清華大學/工學院/動力機械工程學系/碩士(2009年)

摘要

奈米碳管擁有許多優良特性，如優秀的機械性質、導電導熱性佳、質輕及高長徑比等，故將奈米碳管作為複合材料的補強材，並用於航太或電子產品等，而這些應用可能在某種環境下使用。以改質後之奈米碳管可加強與基材間之介面強度，增加其應用範圍，故本研究旨在探討在各種不同環境測試下，改質奈米碳管對複合材料的影響，並用SEM觀察印證結果。結果顯示，改質奈米碳管可以有效的增加奈米碳管與環氧樹脂之間的介面強度。在高溫老化、高溫高濕老化及熱循環之環境測試下，改質奈米碳管皆比未改質奈米碳管有較佳的機械性質。且改質奈米碳管藉由介面強度的增強，降低了複合材料的熱膨脹係數及提高了玻璃轉化溫度，進而提升了熱穩定性。

關鍵字

複合材料 ； 奈米碳管 ； 機械性質 ； 環境效應 ； 改質

並列摘要

Carbon nanotubes have many outstanding properties, such as mechanical, electronic, thermal properties, light weight and high aspect ratio, Carbon nanotubes were used as the reinforcement material of composites, and have been applied CNT to aeronautical industries or electrical products. But these applications could be used in many conditions, so the objective of this study was to discuss the effect of composites with modified-CNT in different testing conditions, and the results were examined using scanning electron microscope. The results demonstrated that modified-CNT could enhance the interfacial adhesion between the CNT and epoxy. At high temperature aging, high temperature/ high humidity aging, and thermal cycle testing conditions, the mechanical properties of modified-CNT composites were better than unmodified-CNT. Because of the interfacial adhesion was enhanced by modified-CNT, which reduced the coefficient of thermal expansion and increased the glass transition temperature, promoting the thermal stability.

並列關鍵字

Composites ； CNT ； Mechanical Properties ； Environmental Effects ； Modify

參考文獻

2. G. Overney, W. Zhong and D. Tománek, “Structural Rigidity and Low Frequency Vibrational Modes of Long Carbon Tubules,” Z. Phys. D 27, 93–96. (1993)

3. B. I. Yakabson, C. J. Brabec and J. Bernholc, “Nanomechanics of carbon nanotubes: Instabilities beyond linear response,” Physics Review Letter, 76, 2511–2514. (1996)

4. M. M. J. Treacy, T. W. Ebbesen and J. M. Gibson, “Exceptionally high Young's modulus observed for individual carbon nanotubes,” Nature, 381, 678–680. (1997)

6. R. S. Ruoff and D. C. Lorents, ” Mechanical and thermal properties of carbon nanotubes,” Carbon, 33(7), 925–930. (1995).

8. S. Iijima, “Helical microtubules of graphitic carbon,” Nature, 354, 56-58. (1991)