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Effect of Carbon Nanotube on Electrical, Thermal and Mechanical Properties of Epoxy

[+] Author Affiliations
Yuanxin Zhou, Biddut Kanti Dey, Shaik Jeelani

Tuskegee University, Tuskegee, AL

Peixuan Wu, Zhongyang Cheng

Auburn University, Auburn, AL

Paper No. IMECE2007-41503, pp. 243-249; 7 pages
doi:10.1115/IMECE2007-41503
From:
  • ASME 2007 International Mechanical Engineering Congress and Exposition
  • Volume 13: Processing and Engineering Applications of Novel Materials
  • Seattle, Washington, USA, November 11–15, 2007
  • Conference Sponsors: ASME
  • ISBN: 0-7918-4307-6 | eISBN: 0-7918-3812-9
  • Copyright © 2007 by ASME

abstract

In this study, electrical, thermal and mechanical properties of multi-walled carbon nanotubes (CNTs) reinforced Epon 862 epoxy have been evaluated. Firstly, 0.1 wt%, 0.2 wt%, 0.3 wt%, and 0.4 wt% CNT were infused into epoxy through a high intensity ultrasonic liquid processor and then mixed with EpiCure curing agent W using a high speed mechanical agitator. The trapped air and reaction volatiles were removed from the mixture using a high vacuum. Neat epoxy sample also was made as reference. Electrical conductivity, dynamic mechanical analysis (DMA, three point bending tests and fracture tests were performed on unfilled, CNT-filled epoxy to identify the loading effect on the properties of composites. Experimental results show significant improvement in electric conductivity. The resistivity of epoxy decreased to 15Ωm with 0.4% CNT. DMA studies revealed that filling the carbon nanotube into epoxy can produce a 90% enhancement in storage modulus and a 17° C increase in Tg, but CNT has little effect on decomposing temperature. Mechanical test results showed that modulus increased with higher CNT loading percentages, but the 0.3 wt% CNT-infusion system showed the maximum strength and fracture toughness enhancement. The decrease in strength and fracture toughness in 0.4% CNT/epoxy was attributed to poor dispersions of nanotubes in the composite.

Copyright © 2007 by ASME

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