The Effect of the Addition of Sulfonate-Doped-Polypyrroles on the Dielectric Properties of Polypyrrole/Silicone Composites

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Authors
  1. Cameron, C.G.
  2. Murphy, J.P.
  3. Underhill, R.S.
Corporate Authors
Defence R&D Canada - Atlantic, Dartmouth NS (CAN)
Abstract
Dielectric polymer actuators that utilize the Maxwell stress effect consist of a thin membrane of elastomer sandwiched between compliant electrodes. When an electrostatic charge is applied across the electrodes, the oppositely charged electrodes attract, resulting in an expansion of the polymer in the plane normal to the compression. In order to maximize performance, the dielectric layer must be non-conducting and have a low Young's modulus and a high dielectric constant. Increasing the dielectric constant of an elastomer can be achieved by adding conductive fillers below the percolation threshold. The goal of this research was to increase the dielectric constant of a silicone elastomer through the addition of a conducting polymer filler. Three different sulfate doped polypyrroles (PPy) were synthesized using a literature method. Composite films using the PPy+dopant filler and a high strength silicone were formed and used to study the effects of changing the dopant and the PPy:silicone ratio on the dielectric properties of the composite film. The different dopant counterions used were sulfate (SO 2-4), ethylbenzene sulfonic acid (EBSA) and polystyrene sulfonate (PSS). The conductivity of the Ppy+dopant was found to increase as PPy-SO 2-4 < PPy-EBSA < PPy-PSS. Increasing the weight percent of PPy+dopant in the silicone matrix corresponded to an increase in the permittivity. These results supply valuable information for the use of high dielectric polymers in actuator and energy

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Keywords
Dielectric actuators;Electroactive polymers;Material properties
Report Number
DRDC-ATLANTIC-TM-2003-249 — Technical Memorandum
Date of publication
01 Jul 2004
Number of Pages
32
DSTKIM No
CA025019
CANDIS No
522544
Format(s):
CD ROM

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