Conducting IPNs and Ionic Liquids: Applications to Electroactive Polymer Devices

The synthesis of interpenetrating polymer networks (IPNs) is proposed as an alternative to polyether-based (co)polymers or networks for the design of solid polymer electrolytes (SPEs). IPNs were prepared from an elastomer bringing the mechanical properties and poly(ethylene oxide). These IPNs, swollen by N-ethylmethylimidazolium bis(trifluoromethanesulfonyl)-imide (EMITFSI), possess an ionic conductivity close to 10−3 S cm−1 at 30 °C. In order to form conducting IPNs, chemical polymerization of 3,4-ethylenedioxythiophene (EDOT) has been carried out within the SPE IPN. A pseudo-trilayer configuration has been obtained with the SPE IPN sandwiched between two interpenetrated PEDOT electrodes. Controlling the PEDOT content from 0.3 to 24 wt% in the material, electrochromic, electroreflective, or electromechanical devices is obtained.

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