Modeling the electrical behaviour of conducting elastomers based on inherent conducting polymers
May 10-15, 2015
Printed electronics is a branch of technology dedicated to create devices and gadgets which are able to be portable, flexible, folded if necessary and in consequence very light. These devices will require energy sources with the same characteristics of the device (portable, light and able to be folded). For that reason we have worked on elastomeric conducting materials able to be used as capacitors in galvanic cells or rechargeable batteries 1. These elastomeric composites are the resulting blend from three polymers: SBS or SBR elastomers as matrix; An inherent conducting polymer nano-composite based on poly(3,4-ethylenedioxythiophene) synthetized over halloysite nanotubes or PEDOT:HT; And a extrinsic ionic conducting polymer based on acrylics dispersed with lithium salts in the proper solvent to obtain a kind of elastomeric acrylic. These components are not miscible between themselves, but they were blended in a mixing chamber to disperse the electrically conducting phases in the elastomeric matrix, so we obtain an elastomeric composite able to be processed by extrusion or rolling milling to obtain flexible films. The present job discusses about how these electrically conducting phases were obtained and characterized, but mainly about the distribution of these conducting phases inside the matrix, by employing a scanning electronic microscopy (SEM) and a DualBeam Versa 3D microscopy. An integrated methodology that enabled linking 3D spatial orientation and bulk structure, enables to estimate the volume fraction occupied by the elastomeric matric (SBS or SBR), figure 1. Moreover, we used this information to generate an idealized theoretical distribution of materials, figure 2, as an input, in a Hashin-Shtrikman model 2, to simulate the electrically conductive behavior of the elastomeric composite and compared it with electrical conductivity measures done using a Keithley electrometer at different voltages.
Alberto Rosas, Pedro Roquero, Eduardo Vivaldo-Lima, Patricia Perez-Salinas, Daniel Phifer, and Javier Revilla, "Modeling the electrical behaviour of conducting elastomers based on inherent conducting polymers" in "Polymer Reaction Engineering IX", E. Vivaldo-Lima, UNAM; J. Debling, BASF; F. Zaldo-Garcia, CP-COMEX; J. Tsavalas, Univ. of New Hampshire Eds, ECI Symposium Series, (2015). http://dc.engconfintl.org/polymer_rx_eng_IX/20