Dynamic Characteristics of Selemion CMV-Based IPMC Actuators in High Humidity Environment

H Ngetha,H Tamagawa,K Ikeda,M Sasaki,S Ito

doi:10.4236/jcc.2014.211006

H Ngetha, H Tamagawa + Show 3 more

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https://doi.org/10.4236/jcc.2014.211006

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Abstract

Electrically-induced bending of Selemion IPMC is caused by the charge induced into the IPMC. This induced charge quantity is susceptible to the absolute humidity of environment. There are two types of charges, the charge causing bending and the rest of charge that causes no bending. In the high humidity environments, where absolute humidity is above 10 gm-3, the quantity of charge causing no bending accounts for the large part of whole charge induced into the Selemion IPMC, while quantity of such charge is negligibly small at the absolute humidity of less than 10 gm-3. Estimating the quantity of those two types of charges individually, we successively analyzed the bending stability of Selemion IPMC at the absolute humidity above 10 gm-3. Consequently, we deduced the following conclusions. 1) There exists a large time delay in the current in response to the voltage input, 2) Current is highly dumping, and 3) Bending behavior is marginally stable under the input of any frequency.

Highlights

Electrical control of IPMC bending (IPMC: Ionic Polymer-Metal Composite) is fundamentally, an important task for achieving a practical actuator of IPMC
Bending stability analysis was relatively simple, as long as we considered the bending of Selemion CMV-based IPMC in the environment with the absolute humidity lower than 10 gm−3
We present the result of the bending stability analysis of Selemion CMV-based IPMC in the environment with the absolute humidity above 10 gm−3

Summary

Introduction

Electrical control of IPMC bending (IPMC: Ionic Polymer-Metal Composite) is fundamentally, an important task for achieving a practical actuator of IPMC. It was previously elucidated that the bending controllability of IPMC was significantly improved by the dehydration treatment of the IPMC [1]: The bending curvature of highly dehydrated IPMC became basically proportional to the total charge imposed on it (Note: The IPMC was in the highly dehydrated state and not in the fully dehydrated state). It is assumed that the control of charge quantity imposed on the IPMC leads to the control of IPMC bending. How to cite this paper: Ngetha, H., Sasaki, M., Tamagawa, H., Ito, S. and Ikeda, K. (2014) Dynamic Characteristics of Selemion CMV-Based IPMC Actuators in High Humidity Environment. Three of the authors of this paper, Ikeda, Sasaki and Tamagawa, previously investigated Selemion CMV-

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