Zhanhu GuoUniversity of Tennessee, USA
Dr. Guo, currently an Associate Professor in Chemical & Biomolecular Engineering Department of at the University of Tennessee (UT), obtained his Bachelor degree from Shan-dong University of Science and Technology (1996), Master degree from Beijing University of Chemical Technology (1999), and Ph.D. degree from Louisiana State University (2005). All the degrees were from Chemical Engineering. Before joining UT, Dr. Guo was working in Lamar University from 2008-2014 as Assistant/Associate Professor in Dan F. Smith Department of Chemical Engineering. Meanwhile, Dr. Guo had received a three-year (2005-2008) postdoctoral training in the Mechanical and Aerospace Engineering Department at the University of California Los Angeles. Dr. Guo directs the Integrated Composites Laboratory (ICL) and has authored/coauthored more than 300 peer-reviewed journal papers and five issued patents. Dr. Guo’s current research team focuses on multifunctional light-weight nanocomposites, especially with polymer and carbon as the hosting matrix to solve the energy and sustainability issues. For more information, please visit http://composites.utk.edu.
Title：Multifunctional Responsive Polymer Nanocomposites
SymposiumB20 Rubber Composites
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Abstract
Strain sensors based on the resistance change upon exposure to mechanical deformation have drawn great interests owing to their wide applications including health monitoring, movement detection and structural health monitoring. Recently, conductive polymer composites (CPCs) based strain sensors have attracted attentions due to their quick response in the form of electrical resistance variation when subjected to tensile strain. In this talk, I will share our recent research outcomes from two kinds of high elastic thermoplastic polyurethane (TPU) based CPCs. One is the bulk graphene/TPU CPCs fabricated by the hot pressing technique, the effects of graphene loading, strain amplitude and strain rate on the tensile strain behaviors were studied systematically. The two dimensional graphene and the flexible TPU matrix were found to endow these nanocomposites with a wide range of strain sensitivity and good sensing stability for different strain patterns. In addition, graphene&CNT/TPU CPCs were also prepared to investigate the synergistic effect on the strain sensing behavior.Graphene acted as ‘spacer’ to separate the entangled CNTs from each other and the CNTs bridged the broad gap between individual graphene nanosheets. The built synergism benefited the dispersion of CNT and formation of effective conductive paths, leading to a better electrical conductivity at lower conductive filler content. Besides, ordered and stable conductive networks were formed with the co-addition of graphene and CNT, obtaining stable response patterns with single peak, beneficial for practical applications of strain sensors. The other is the porous CNT/TPU CPCs with highly compressibility fabricated by the freeze-drying technique. The porous structure and good elasticity of TPU endowedthe final finishings with good compressibility as high as 90%. Meanwhile, the studied compression strain sensing behaviors under different demonstrated good sensing ability in a large strain range. All these provide guidelines for the fabrication of CPCs based strain sensors under different practical demands.
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