Actuators6

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Actuators6

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