Graphene, 2015, 4, 7-19 Published Online January 2015 in SciRes. http://www.scirp.org/journal/graphene http://dx.doi.org/10.4236/graphene.2015.41002 How to cite this paper: Regueira, R., Suckeveriene, R.Y., Brook, I., Mechrez, G., Tchoudakov, R. and Narkis, M. (2015) Inves- tigation of the Electro-Mechanical Behavior of Hybrid Polyaniline/Graphene Nanocomposites Fabricated by Dynamic Inter- facial Inverse Emulsion Polymerization. Graphene, 4, 7-19. http://dx.doi.org/10.4236/graphene.2015.41002 Investigation of the Electro-Mechanical Behavior of Hybrid Polyaniline/Graphene Nanocomposites Fabricated by Dynamic Interfacial Inverse Emulsion Polymerization Rami Regueira 1,2 , Ran Yosef Suckeveriene 2,3 , Irena Brook 1,2 , Guy Mechrez 2 , Roza Tchoudakov 2 , Moshe Narkis 2* 1 Interdepartmental Program in Polymer Engineering, Technion-IIT, Haifa, Israel 2 Department of Chemical Engineering, Technion-IIT, Haifa, Israel 3 Department of Water Industries Engineering, Kinneret College in the Jordan Valley, Zemach, Israel Email: * narkis@tx.technion.ac.il Received 30 December 2014; accepted 18 January 2015; published 26 January 2015 Copyright © 2015 by authors and Scientific Research Publishing Inc. This work is licensed under the Creative Commons Attribution International License (CC BY). http://creativecommons.org/licenses/by/4.0/ Abstract This paper describes a study on electrical resistivity under loading of polyaniline (PANI)/gra- phene nanocomposite powders and compacts. The composites were prepared by an in-situ inter- facial dynamic inverse emulsion polymerization technique under sonication of aniline in the presence of graphene sheets in chloroform. During polymerization the graphene nanoplatelets are coated with PANI and are well dispersed both in the polymeric suspension and then in the dried polymer matrix as evidenced by cryogenic transmission electron microscopy (Cryo-TEM) and high resolution scanning microscopy (HRSEM). The presence of graphene nanoplatelets lowers the electrical resistivity of the polyaniline by two orders of magnitude for both the powder and the compact composites as demonstrated by their electrical resistance measurements conducted un- der loading. The lowest measured electrical resistivity values were 5 Ω∙cm for 33% wt. graphene powder and 8 Ω∙cm for 41% wt. graphene compacted composites. Cyclic electrical measurements under loading showed a distinct reproducible dependence of the bulk resistivity vs. applied pres- sure. This repetition is a key component for electro-mechanical sensors. To the authors’ best knowledge, this is the first report on polymerization of aniline in presence of graphene by the in-situ interfacial dynamic inverse emulsion polymerization technique and also the first report on cyclic electrical measurements under pressure of PANI/graphene nanocomposites. Keywords Nanocomposites, Polyaniline, Graphene, Electro-Mechanical Sensors, Inverse Emulsion * Corresponding author.