Non-linear time variant model intended for polypyrrole-based actuators

Meisam Farajollahi; John D. W. Madden; Farrokh Sassani

doi:10.1117/12.2046073

26 March 2014 Non-linear time variant model intended for polypyrrole-based actuators

Meisam Farajollahi, John D. W. Madden, Farrokh Sassani

Proceedings Volume 9056, Electroactive Polymer Actuators and Devices (EAPAD) 2014; 90561T (2014) https://doi.org/10.1117/12.2046073
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2014, San Diego, California, United States

Abstract

Polypyrrole-based actuators are of interest due to their biocompatibility, low operation voltage and relatively high strain and force. Modeling and simulation are very important to predict the behaviour of each actuator. To develop an accurate model, we need to know the electro-chemo-mechanical specifications of the Polypyrrole. In this paper, the non-linear time-variant model of Polypyrrole film is derived and proposed using a combination of an RC transmission line model and a state space representation. The model incorporates the potential dependent ionic conductivity. A function of ionic conductivity of Polypyrrole vs. local charge is proposed and implemented in the non-linear model. Matching of the measured and simulated electrical response suggests that ionic conductivity of Polypyrrole decreases significantly at negative potential vs. silver/silver chloride and leads to reduced current in the cyclic voltammetry (CV) tests. The next stage is to relate the distributed charging of the polymer to actuation via the strain to charge ratio. Further work is also needed to identify ionic and electronic conductivities as well as capacitance as a function of oxidation state so that a fully predictive model can be created.

Citation Download Citation

Meisam Farajollahi, John D. W. Madden, and Farrokh Sassani "Non-linear time variant model intended for polypyrrole-based actuators", Proc. SPIE 9056, Electroactive Polymer Actuators and Devices (EAPAD) 2014, 90561T (26 March 2014); https://doi.org/10.1117/12.2046073

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