Tensile Piezoresistive Behavior of Polyethylene Terephthalate/Carbon Black Composite
Publication: Journal of Materials in Civil Engineering
Volume 30, Issue 6
Abstract
The polyethylene terephthalate/carbon black (PET/CB) composite was fabricated by twin-screw extrusion and injection molding method. The morphology, electrical conductive percolation threshold, tensile piezoresistivity, and stress-strain behavior of the composite were investigated. A scanning electron microscope showed that the carbon black was dispersed in the PET matrix homogeneously, but some little visible carbon black agglomerates can also be detected in the composite. The electrical conductive percolation threshold of composite was 15% by weight of carbon black. When the carbon black content changed from 15 to 20% by weight, the PET/CB composite had the tensile piezoresistivity. At the axial tensile strain from 0 to 0.001, the composite with 20% by weight carbon black had the highest value of fractional change in resistivity, which had a linear relationship to tensile strain. After five times cyclic tensile loading and 100,000 cycles fatigue tensile loading, the composite showed good repeatability in tensile piezoresistivity. The yield strength and tensile strength of composite were 18 and 23.8 MPa, respectively. The results showed the potential way of using PET/CB composite as strain sensors for civil engineering.
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Acknowledgments
Sincere acknowledgements are given to Zhi Ge and Ning Zhang for their great help in the lab. This work was supported by the China Ministry of Transport Enterprise Technical Innovation Project (Grant No. 2015 315 Q15 070).
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Published In
Journal of Materials in Civil Engineering
Volume 30 • Issue 6 • June 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Aug 10, 2017
Accepted: Nov 14, 2017
Published online: Apr 9, 2018
Published in print: Jun 1, 2018
Discussion open until: Sep 9, 2018
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