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http://dx.doi.org/10.17702/jai.2012.13.3.137

Effect of Interfacial Bonding on Piezoresistivity in Carbon Nanotube and Reduced Graphene Oxide Polymer Nanocomposites  

Hwang, Sang-Ha (School of Mechanical and Advanced Materials Engineering, Ulsan National Institute of Science and Technology)
Kim, Hyeon-Ju (School of Mechanical and Advanced Materials Engineering, Ulsan National Institute of Science and Technology)
Sung, Dae-Han (School of Mechanical and Advanced Materials Engineering, Ulsan National Institute of Science and Technology)
Jung, Yeong-Tae (School of Mechanical and Advanced Materials Engineering, Ulsan National Institute of Science and Technology)
Kang, Ku-Hyek (School of Mechanical and Advanced Materials Engineering, Ulsan National Institute of Science and Technology)
Park, Young-Bin (School of Mechanical and Advanced Materials Engineering, Ulsan National Institute of Science and Technology)
Publication Information
Journal of Adhesion and Interface / v.13, no.3, 2012 , pp. 137-144 More about this Journal
Abstract
Chemical functionalization of carbon nanomaterials (CNMs) is generally carried out for increasing interfacial adhesion between filler and polymer matrix for CNM-polymer nanocomposites. The chemically functionalized CNTs can produce strong interfacial bonds with many polymers, allowing CNT based nanocomposites to possess high mechanical and functional properties. Hence, increased surface adhesion can be measured indirectly by observing increased mechanical properties. However, there is a more direct way to observe interfacial bonds between polymer and CNM by measuring piezoresistivity behavior so that we can imagine the behavior of CNM particles in polymer matrix under deflection. Fuctionalization of MWCNT and rGO was carried out by oxidization reaction of MWCNT and rGO with $H_2SO_4/HNO_3$ solution. Electrical resistivities of MWCNT-PMMA and rGO-PMMA composites were decreased after functionalization because of the destructive fuctionalization process. Meanwhile, piezoresistivities of functionalized CNM-PMMA composites showed more sensitive behavior under the same deflection as compared to pristine CNM-PMMA composites. Therefore, mobility of CNM in polymer matrix was found to be improved with chemical functionalization.
Keywords
MWCNT; rGO; nanocomposite; PMMA; electrical resistivity; piezoresistivity;
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