Journal
POLYMER
Volume 53, Issue 23, Pages 5367-5374Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2012.09.022
Keywords
Carbon nanotubes; Multifunctional composites; Electrical properties
Categories
Funding
- Air Force Office of Scientific Research (AFOSR) [FA9550-09-1-0218]
- Air Force Research Laboratory (AFRL) [FA9550-11-C-0003]
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The thermoresistive behavior of nanocomposites with electrically conductive networks of carbon nanotubes (CNTs) in a vinyl ester polymer matrix were characterized using an in situ electrical resistance measurement during thermomechanical analysis. A series of specimens above the electrical percolation threshold ranging from 0.10 to 1.00 wt% CNT were studied. The results show the thermoresistive behavior is strongly dependent on the CNT concentration, thermal expansion and polymer segmental motion. At higher concentrations of carbon nanotubes the temperature coefficient of resistance (TCR) varied with temperature and could either be positive or negative while specimens with low CNT concentrations near the percolation threshold showed a near-zero but negative TCR. Since the nano-composite bulk resistivity of the specimens is dominated by the tunneling resistance at CNT/CNT junctions the nanotubes effectively act as a network of sensors that can detect thermal transitions and other thermochemical changes in situ. (C) 2012 Elsevier Ltd. All rights reserved.
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