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Mechanical and electrical property improvement in CNT/Nylon composites through drawing and stretching
Authors:Xin WangPhilip D. Bradford  Wei LiuHaibo Zhao  Yoku InoueJon-Paul Maria  Qingwen LiFuh-Gwo Yuan  Yuntian Zhu
Affiliation:a North Carolina State University, 911 Partners Way, Raleigh, NC 27695, USA
b Shizuoka University, Johoku, Hamamatsu 432-8561, Japan
c Suzhou Institute of Nano-Tech and Nano-Bionics, Suzhou 215123, China
Abstract:The excellent mechanical properties of carbon nanotubes (CNTs) make them the ideal reinforcements for high performance composites. The misalignment and waviness of CNTs within composites are two major issues that limit the reinforcing efficiency. We report an effective method to increase the strength and stiffness of high volume fraction, aligned CNT composites by reducing CNT waviness using a drawing and stretching approach. Stretching the composites after fabrication improved the ultimate strength by 50%, 150%, and 190% corresponding to stretch ratios of 2%, 4% and 7%, respectively. Improvement of the electrical conductivities exhibited a similar trend. These results demonstrate the importance of straightening and aligning CNTs in improving the composite strength and electrical conductivity.
Keywords:A. Carbon nanotubes   A. Nanocomposites   A. Polymer-matrix composites (PMCs)   B. Mechanical properties   B. Electrical properties
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