Polymer actuators based on Maxwell forces

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Authors
  1. Szabo, J.P.
  2. White, B.
  3. Leidnet, J.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
There are currently two main classes of actuating materials - piezoelectric materials, characterized by high frequency response but very small movements, and shape memory alloys, characterized by very slow response but relatively large movements. Polymeric actuators are an emerging class of materials, which offer the potential to fill the performance gap between piezoelectric materials and shape memory alloys. There are four main classes of polymeric actuators: (i) piezoelectric, (ii) hydrated membranes and hydrogels, (iii) electrostrictive, and (iv) dielectric. In this presentation, the possible applications of dielectric polymers to active noise and vibration control will be presented, along with results of preliminary work to fabricate and characterize these materials. Dielectric actuators based on cast thermoplastic polyurethane films were prepared with brushed-on graphite powder as electrodes. Strains of up to around two percent were measured. This strain corresponds to a stress of approximately 150 kPa. The voltage/strain relationship followed a parabolic relationship as predictd by theoretical considerations. Actuators with similar strain values were prepared by forming longer films and rolling them into tubes.
Keywords
Thermoplastic polyurethane films;Shape memory alloys
Report Number
DREA-SR-2001-094-SES-VIII-PAP-40 — Special Report
Date of publication
01 Oct 2001
Number of Pages
11
DSTKIM No
CA011877
CANDIS No
516455
Format(s):
Hardcopy;Document Image stored on Optical Disk

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