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Preparation and Actuation Performance of Ionic Polymer-Metal Composite Actuators Based on Nafion-Alumina Composite Membranes  

Lee, Jang-Woo (Department of Materials Chemistry and Engineering, Artificial Muscle Research Center, Konkuk University)
Kim, Woo-Sung (Department of Materials Chemistry and Engineering, Artificial Muscle Research Center, Konkuk University)
Yoo, Young-Tai (Department of Materials Chemistry and Engineering, Artificial Muscle Research Center, Konkuk University)
Publication Information
Polymer(Korea) / v.33, no.4, 2009 , pp. 377-383 More about this Journal
Abstract
Ionic polymer-metal composite (IPMC) actuator generates bending actuation via ion/water flux to the cathode side under an electric field. Polyelectrolytes in IPMC should possess high water-retention capability, proton conductivity, and Young's modulus. In this study. for endowing IPMCs with these properties, Nafion-alumina composite membranes containing $\alpha$- or $\gamma$-aluminas of $4{\sim}8$ wt% were prepared. Mechanical moduli of Nafion-alumina composite membranes were $7{\sim}3$ MPa higher than that of Nafion, with the slight decrease in proton conductivity. At DC 3 V. the actuation performance of the Nafion-$\alpha$-alumina (8 wt%)-IPMC was superior to that of the typical Nafion-IPMC. exhibiting 2.7 times the displacement with an enhanced blocking force. The enhanced actuation performance with the Nafion-$\alpha$-alumina composite membranes was attributed to the higher proton conductivity, the elevated ion/water flux, and the lower interfacial electric resistance of platinum electrodes and membrane, compared with those containing $\gamma$-alumina.
Keywords
ionic polymer-metal composite; actuators; alumina; Nafion;
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