EventsThe Eighteenth International Conference of Experimental Mechanics
Event submissions
Published
with-doi10.3390/ICEM18-05228
This submission belongs to the session ICEM. ICEM 2018 of the event The Eighteenth International Conference of Experimental Mechanics
Published date
15 May, 2018
Citation
Jeffrey L. Gair, Dale L. Lidston, Daniel P. Cole, Robert H. Lambeth, Alex J. Hsieh, Hugh A. Bruck, Asha J. Hall, Mark L. Bundy, Brian L. Wardle, Ultrahigh Carbon Nanotube Volume Fraction Effects on Micromechanical Quasi-Static & Dynamic Properties of Poly(Urethane-Urea) Filled Nanocomposites, in Proceedings of The Eighteenth International Conference of Experimental Mechanics, Brussels, 1 July–5 July 2018, MDPI: Basel, Switzerland, doi: 10.3390/ICEM18-05228
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Ultrahigh Carbon Nanotube Volume Fraction Effects on Micromechanical Quasi-Static & Dynamic Properties of Poly(Urethane-Urea) Filled Nanocomposites

Jeffrey L. Gair 1
Dale L. Lidston 2
Daniel P. Cole 3
Robert H. Lambeth 4
Alex J. Hsieh 4
image
Hugh A. Bruck 5
Asha J. Hall 3
Mark L. Bundy 3
Brian L. Wardle 2
1. U.S. Army Research Laboratory, RDRL-VTM, Aberdeen Proving Ground, MD 21005-5069, USA Department of Mechanical Engineering, University of Maryland, College Park, MD 20742, USA Department of Aeronautics and Astronautics, Massachusetts Institute of Technol
2. Department of Aeronautics and Astronautics, Massachusetts Institute of Technology, Cambridge,MA 02139, USA
3. U.S. Army Research Laboratory, RDRL-VTM, Aberdeen Proving Ground, MD 21005-5069, USA
4. U.S. Army Research Laboratory, RDRL-WMM, Aberdeen Proving Ground, MD 21005-5069, USA
5. Department of Mechanical Engineering, University of Maryland, College Park, MD 20742, USA
Abstract

Poly(urethane-urea) (PUU) has been infused into ultrahigh volume fraction carbon nanotube (CNT) forests using a heat-curable polymer formula. Polymer nanocomposites with carbon nanotube volume-fractions of 1, 5, 10, 20, and 30% were fabricated by overcoming densification and infusion obstacles. These polymer nanocomposites were nanoindented quasi-statically and dynamically to discern process-structure-(mechanical) property relations of polymerizing PUU in such densely-packed CNT forests. A 100× increase in indentation modulus has been observed, which is attributed not only to CNT reinforcement of the matrix, but also to molecular interactions in the matrix itself. Quasi-static elastic moduli ranging from 10MPa – 4.5GPa have been recorded. Storage modulus for all materials is found to track well at loadings of 200Hz, with little effect observed from increasing CNT volume fraction.

Keywords
carbon nanotubes
polymer nanocomposites
polyurethane urea
self-assembly
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