Journal
JOURNAL OF MATERIALS RESEARCH
Volume 28, Issue 17, Pages 2415-2425Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1557/jmr.2013.218
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Funding
- Natural Science and Engineering Research Council (Canada)
- Canada Research Chairs Program
- Canada Foundation for Innovation
- Ontario Government
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The development and characterization of pressure sensing porous nanocomposites are reported here. A thermoplastic polyurethane (TPU) was chosen as an elastomeric matrix, which was reinforced with multiwall carbon nanotubes (MWNTs) by high shear twin screw extrusion mixing. Porosity was introduced to the composites through the phase separation of a single TPU-carbon-dioxide gas solution. Interactions between MWNT and TPU were elucidated through calorimetry, gravimetric decomposition, conductivity measurements, and microstructure imaging. The piezoresistance (pressure-resistance) behavior of the nanocomposites was investigated and found to be dependent on MWNT concentration and nanocomposite microstructure. Mechanisms of piezoresistance in solid and porous nanocomposites are proposed.
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