Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7850235 | Carbon | 2016 | 9 Pages |
Abstract
Wide angle X-Ray scattering was used to measure the progression of alignment when stretching carbon nanotube (CNT) sheets. The nanotubes were grown by an aerogel chemical vapor deposition process and drawn onto a drum rotating at a draw rate of 15 m/min to form a sheet. Samples were cut from this sheet at 0°, 10°, 25°, 45° and 90° with respect to the drawing direction. Samples stretched along the drawing direction reached 28% elongation at failure, whereas samples stretched 90° to the drawing direction reached 44% elongation at failure. In spite of this, the 0° sample had 50% of its nanotubes aligned along the stretching axis, while the 90° sample had 40% of its nanotubes aligned within ±10° of the stretching axis. The strength and modulus of samples cut along the growth direction were 1.8à and 4.9à higher than those cut in the 90° direction, with a smooth drop in strength observed as the cutting direction increased from 0° to 90°. This work reveals the relationship between sheet scale deformation and micro scale CNT reorientation.
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Authors
Joseph Severino, Jenn-Ming Yang, Larry Carlson, Robert Hicks,