Actuators6

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  • 1. Conducting polymer actuators
    Pagilagan, Evan Mart P.
  • 2. What is a Conducting polymer?
    Are organic polymers that conduct electricity.
    Generally not plastics.
    Can offer high electrical conductivity but do not show mechanical properties as other commercially used polymers do.
    The electrical properties can be fine-tuned using the methods of organic synthesis and by advanced dispersion techniques.
  • 3. Types of Conducting Polymers
    Ionic Conductive Actuator
    - soft, small, and lightweight.
    - is flexible, made of polymer and metallic materials.
    - low voltage requirement, only 2V.
    The actuator element
    - motion can be controlled electrically.
    - soft as muscles.
    - light.
    - doesn’t generate sound upon operation.
    - Creation of the drive device from 0.1 mm to 10mm is
    possible.
    - combination of element results in living thing like movement.
  • 4. - Power consumption is able to move few for a long time.
    - Although it is driven in water fundamentally, a drive in air is also possible by the design of containing water.
  • 5. In air operation. Robot Hand
  • 6. Conducting Polymer Actuator
    - expand and shrink with doping and dedoping.
    - electrochemically driven for actuation.
    - polyacetylene, polypyrrole, polyphenylene, Polythiophene, Polyaniline, Poly(phenylenevinylene).
  • 7. Polypyrrole (PPy)– conductive polymer
    - oxidation-reduction reaction when voltage is applied
    - redoxinduces ion flow into or out of polymer
    - flow in = expansion
    - requires electrolyte
  • 8.
    • Performance for PPybilayer actuator
    - strain: 12.4%
    - energy density: 0.040 J/g
    - speed: <1Hz
    - output pressure: 22 MPa
    - drive voltage: +/- 1V
  • 9. “Wet” versus “Dry” actuation
    “Wet” – Ionic actuators. Utilize mobility or diffusion of ions.
    polymer-metal composites
    conductive polymers
    others . . .
    “Dry” – Electronic actuators. Utilize Coulomb forces.
    dielectric elastomers
    electrostrictive polymers
    others . . .
  • 10. Electrostricted Polymers
    Electrostricted graft elastomers
    motion achieved through electrostriction
    applied electric field induces a change from one polarized direction to another, or one phase to another.
    flexible backbone
    polarized chain
  • 11. Dielectric Elastomers
    elastomer film is sandwiched between compliant electrodes
    apply electric field: E = V/m
    Maxwell pressure: p = ee0E2
    electrodes squeeze elastomer in thickness
    apply voltage
    V+
  • 12. Dielectric Elastomers
    materials available off-the-shelf
    - 3M VHB acrylic tape
    - various silicone elastomers
    desired features
    - high dielectric constant and breakdown strength
    - low elastic modulus – high % elongation
    - thin film
  • 13. Dielectric Elastomers
    1
    2
    3
    4
    Increase performance through prestrain
    - stretch elastomer film in one planar direction
    - fix motion in prestrained direction
    - allow expansion in other planar direction during activation
    electrode
    V+
    dielectric elastomer
    rigid constraints
  • 14. Dielectric Elastomers
    • Performance
    - strain: >200%
    - energy density: 0.75 – 3.4 J/cm3
    - speed: 10Hz - 20kHz
    - output pressure: 3.0 – 7.2 MPa
    - drive voltage: 5kV
  • 15. ACTUATOR COMPARISON
  • 16. REFERENCES
    http://en.wikipedia.org/wiki/Conductive_polymer
    http://www.eamex.co.jp/tech_e.html
    http://www.eamex.co.jp/denshi_hp/english/denshi_idex_e.htm
    web.me.com/daloy/LOY...Site/Polymer.../conducting%20polymers.ppt
    www.cs.berkeley.edu/~jfc/DR/F03/lectures/lec15/lec15.ppt