Investigation On Piezoresistive Characteristics Of Carbon Nanotube/Carbon Black/Polymer Composites

This paper studies the piezoresistive characteristics of carbon nanotubes/carbon black/polymer. Based on the General Effective Media Theory, throughextend analysis and further correction of GEM model, obtained the pressureresistance calculation model of carbon nanotubes and carbon black filled withsilicone rubber; through experimental comparison and microstructure analysis,specifically expounded the different carbon-based fillers silicone rubberpiezoresistive effect, and analyzed carbon nanotubes and carbon black "Synergyeffect"; through the selection of different matrix materials to improve thepiezoresistive characteristics of conductive composites. The results obtained for thecomposite material used in flexible tactile sensor provides a theoretical basis.The pressure resistance calculation model of carbon nanotubes and carbonblack filled with silicone rubber was studied, through experiments on thecalculation model analysis and correction. The results show that in carbonnanotubes/carbon black/silicone rubber system, select the appropriate componentratio of carbon nanotubes and carbon black, can obtain low percolation threshold,and piezoresistive experimental results and the calculated curve deviation smaller;due to the"synergistic effect"of carbon nanotubes/carbon black and boundaryconditions of the general effective medium theory, when the volume fraction of theconductive filler deviates from the percolation threshold, through certain correction,experimental results and the calculation model curve can be good match, however,when deviating from the threshold further, cannot be corrected to make theanastomosis.The piezoresistive characteristics of CNTs/SR, CB/SR of CNTs/CB/SRconductive composites was studied, and experimental comparison piezoresistivesensitivity and range. The results show that carbon nanotubes and carbon black"synergistic effect", the CNTs/CB/SR have highest piezoresistive sensitivity andmaximum force range. Use of conductive percolation model"synergistic effect" isverified, and further analyzes its microstructure. Results show that there issignificant"Synergistic effect"between carbon nanotubes and carbon black,Percolation model validation, further analysis of the microstructure of carbon nanotubes and carbon black synergies, the mixture filling system has formed acomplete uniform conductive network. The results showed that: there aresignificant "Synergistic effect" between carbon nanotubes and carbon black, themixture filling the system forming a complete and uniform conductive network.The piezoresistive characteristics of force-sensitive conductive composites ofdifferent matrix materials. Through the comparison and analysis of thepiezoresistive characteristics of the conductive silicon rubber and the conductivepolyurethane, and the combination of the microstructure analysis showed that thepiezoresistive characteristics of the composite material can be improved bychanging matrix material.