Journal
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
Volume 48, Issue -, Pages 129-136Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2013.01.004
Keywords
Nano-structures; Polymer-matrix composites (PMCs); Electrical properties; Mechanical properties
Funding
- China Postdoctoral Science Foundation [20110491003, 2012T50638]
- National Natural Science Foundation of China-Henan Talents Fostering joint Funds [U1204507]
- National Program on Key Basic Research Project (973 Program) [2012CB025903]
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Resistivity variations of carbon black (CB)/polypropylene (PP) and carbon nanotubes (CNTs)/PP conductive composites subjected to tensile strain, that is, the strain sensing behaviors, were studied detailedly. With increasing strain to the maximum value, 3%, the responsivity (Delta R/R-0, R-0 is the original resistance, Delta R is instantaneous change in resistance) increased in exponential and linear fashion for CB/PP and CNTs/PP, respectively, the phenomenon was explained by the tunneling theory. More interestingly, when 10 extension-retraction cycles were applied, for CB/PP, values of max and min Delta R/R-0 increased gradually with increasing the cycle number; while for CNTs/PP, max and min Delta R/R-0 values became more and more negative. It is suggested that the difference mainly depends on the distinction in the microstructure of conductive fillers, the interaction between fillers and matrix and the hysteresis effect resulting from viscoelastic behavior of composites. A schematic illustration was proposed to illustrate the mechanism of the different sensing behaviors. (C) 2013 Elsevier Ltd. All rights reserved.
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