Embedding polyethylene oxide (PEO) in polypyrrole doped with dodecylbenzenesulfonate (PPy/PEO-DBS) leads to increase linear actuation due to improved ionic conductivity. In this research our goal is to investigate the effect of solvent exchange from aqueous (aq) to propylene carbonate (PC) using same concentration of electrolyte bis(trifluoromethane) sulfonamide lithium (LiTFSI). As previously observed for the case of PPy/DBS films, the actuation direction of PPy/PEO-DBS changed from purely cation-driven in (aqueous) LiTFSI-aq to purely anion driven in (propylene carbonate) LiTFSI-PC. Cyclic voltammetry driven electro-chemo-mechanical-deformation (ECMD) measurements showed that the strain in LiTFSI-PC was more than double than that of aqueous electrolyte consuming only half of the charge density. The diffusion coefficients were determined from the chronoamperometric measurements with higher values found in LiTFSI-PC. Energy dispersive X-Ray spectroscopy and scanning electronic microscopy measurements were performed to characterize the PPy/PEO-DBS films.
Roshan Khadka, Zane Zondaka, Jadranka Travas-Sejdic, Tarmo Tamm, and Rudolf Kiefer, "Polypyrrole with polyethylene oxide: linear actuation in organic and aqueous electrolytes," Proc. SPIE 10594, Electroactive Polymer Actuators and Devices (EAPAD) XX, 105941W (Presented at SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring: March 09, 2018; Published: 27 March 2018); https://doi.org/10.1117/12.2300145.
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