Comparative experimental study of ionic polymer–metal composites with different backbone ionomers and in various cation forms

摘要: An ionic polymer–metal composite (IPMC) consisting of a thin perfluorinated ionomer (usually, Nafion or Flemion) strip, platinum, and/or gold plated on both faces and neutralized by certain amount appropriate cations undergoes large bending motion when, in hydrated state, small electric field is applied across its thickness. When the same membrane suddenly bent, voltage order millivolts produced surfaces. Hence IPMCs can serve as soft actuators sensors. This coupled electrical–chemical–mechanical response depends structure backbone polymer, morphology conductivity metal electrodes, nature cations, level hydration (or other solvent uptake). We have carried out extensive experimental studies Nafion- Flemion-based various cation forms, seeking to understand fundamental properties these composites, explore mechanism their actuation, finally, optimize performance for potential applications. The results some tests with alkali-metal alkyl-ammonium are reported here. Compared Nafion-based IPMCs, fine dendritic goldelectrodes higher ion-exchange capacity, better surface conductivity, longitudinal stiffness. They also display greater actuation under voltage. In addition, they do not reverse relaxation sustained dc voltage, which typical form. Flemion thus promising composites application actuators.