11 July 2002 Extensional transduction properties of ionic polymer materials
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A series of experiments are performed to quantify the stress induced in ionic polymer actuators by electrical stimulation. The test fixture is validated by measuring the modulus of hydrated samples comparing the measurements to previous results in the open literature. A series of dynamic tests demonstrates that the modulus of the material can be varied up to approximately 30% through the application of a DC electric field to the polymer. Dynamic tests indicate that the peak in-plane stress is on the order of 10-100 kPa for 1 V step changes in the applied potential. The magnitude of the in-plane stress drops approximately 10 dB per decade as a function of frequency for short duration sinusoidal excitations. Experimental results reveal that out-of-plane bending contributes substantially to the in-plane stress induced in the polymer. Constraining the out-of-plane motion reduces the induced stress by a factor of 4 to 5. Long duration sinusoidal excitation induces a controllable relaxation within the polymer and a dehydration in which the rate of stress is controlled by the amplitude of the excitation. The magnitude of the induced stress is much larger during relaxation or dehydration as compared to the stress induced by electrical stimulation. Stresses on the order of 100 kPa to 1 Mpa are measured.
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Orion Parrott, Orion Parrott, Alyssa Nicolaisen, Alyssa Nicolaisen, Donald J. Leo, Donald J. Leo, } "Extensional transduction properties of ionic polymer materials", Proc. SPIE 4695, Smart Structures and Materials 2002: Electroactive Polymer Actuators and Devices (EAPAD), (11 July 2002); doi: 10.1117/12.475168; https://doi.org/10.1117/12.475168

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