Preparation and Characterization of High Dielectric Constant Polymer Films

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Authors
  1. Harrison, N.
  2. Szabo, J.
Corporate Authors
Defence R&D Canada - Atlantic, Dartmouth NS (CAN);Bodycote Materials Testing Canada Inc, Mississauga Ont (CAN)
Abstract
Electroactive polymers are an emerging class of actuating materials capable of generating large displacements and fast response times. Dielectric actuators operate on the principle of Maxwell stress and their response is highly dependent on the material’s electrical and mechanical properties. Unfilled and composite films based on a thermoplastic polyurethane were prepared using solvent cast methods, and their dielectric properties were determined. Dielectric constants of up to 52.5 at 100 Hz were measured. The observed permittivities of the composites were consistent with the predictions of the Bruggeman model. Dielectric breakdown strength varied greatly from position to position on each film, reflecting the large statistical variation in flaw density over each film’s area. For polyurethane/BaTiO3 composite films, there was no significant change in breakdown strength with increasing barium titanate concentration.

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Keywords
Dielectric actuators;Electroactive polymers;Electrostriction;Material properties;Maxwell stress
Report Number
DRDC-ATLANTIC-TM-2002-159 — Technical Memorandum
Date of publication
01 Sep 2002
Number of Pages
28
DSTKIM No
CA023471
CANDIS No
520786
Format(s):
CD ROM

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