Abstract

Electroactive polymers (EAPs) that bend, swell, ripple (first generation materials), and now contract with low electric input (new development) have been produced. Ras Labs also produces EAP materials that quickly contract and then expand, repeatedly, by reversing the polarity of the electric input. Using applied voltage step functions produces varying amounts of contraction, which has enormous potential. A combination of high and low voltages could produce gross and fine motor skills, respectively, with both large motor control and fine motor control (fine manipulation) within the same actuator unit. The mechanism of contraction is not well understood. Radionuclide-labeled experiments were conducted to follow the movement of electrolytes and water in these EAPs. In addition, other experiments were conducted to determine how and why contraction occurs. One of the biggest challenges in developing these actuators, however, is the electrode-EAP interface because of the pronounced movement of the EAP. Plasma treatment of the electrodes, along with other strategies, allows for the embedded electrodes and the EAP material of the actuator to work and move as a unit, with no detachment, by significantly improving the metal–polymer interface, analogous to nerves and tendons moving with muscles during movement.

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