Electroactive polymer transducers

• US 8,248,750 B2
• Filed: 09/19/2008
• Issued: 08/21/2012
• Est. Priority Date: 12/13/2007
• Status: Active Grant

• Current Assignee: Bayer Materialscience AG (Covestro AG)
• Original Assignee: Bayer Materialscience AG (Covestro AG)
• Inventors: Biggs, Silmon James, Russell, Gordon, Johnson, Edward F., White, Luther Lawford III
• Primary Examiner(s): Ha, Nguyen T
• Assistant Examiner(s): Dang, Hung
• Application Number:
  US12/234,023
• Publication Number:
  US 20090154053A1
• Time in Patent Office: 1,432 Days
• Field of Search: 361/273, 361/272, 361/277, 361/305, 361/321.5, 361/303, 310/363, 310/311
• US Class Current: 361/273
• CPC Class Codes: H10N 30/098 Forming organic materials
• CPC Class Codes: H10N 30/206 using only longitudinal or thickness displacement, e.g. d33 or d31 type devices
• CPC Class Codes: H10N 30/883 Further insulation means against electrical, physical or chemical damage, e.g. protective coatings
• CPC Class Codes: Y10T 29/49007 Indicating transducer

Abstract

Dielectric elastomer or electroactive polymer film transducers configured to minimize high electrical field gradients that can lead to partial discharge and corona.

Claims

1. A transducer film comprising:

a dielectric elastomer material having a modulus of elasticity less than about 100 MPa;

an electrode material on at least one side of the dielectric elastomer material; and

a partial discharge suppressant in contact with at least a portion of at least one of the dielectric elastomer material or the electrode material, the partial discharge suppressant having a dielectric constant greater than that of air and a modulus of elasticity no greater than that of the dielectric elastomer.

2. The transducer film of claim 1, wherein the partial discharge suppressant contacts only electrode material.

3. The transducer film of claim 1, wherein the partial discharge suppressant is in contact with an outwardly facing portion of the electrode material.

4. The transducer film of claim 1, wherein the partial discharge suppressant is in contact with an inwardly facing portion of the electrode material.

5. The transducer film of claim 1, wherein the partial discharge suppressant is in contact with only the dielectric elastomer material.

6. The transducer film of claim 1, wherein the partial discharge suppressant is in contact with an outwardly facing portion of the dielectric elastomer material.

7. The transducer film of claim 1, wherein the partial discharge suppressant is in contact with an inwardly facing portion of the dielectric elastomer material.

8. The transducer film of claim 7, wherein the partial discharge suppressant lies between the dielectric elastomer material and the electrode material.

9. The transducer film of claim 1, wherein the partial discharge suppressant is in contact with at least a portion of the dielectric elastomer material and at least a portion of the electrode material.

10. The transducer film of claim 1, wherein electrode material is on both sides of the dielectric elastomer material, and wherein the extent of contact of the partial discharge suppressant is substantially the same on both sides of the dielectric elastomer material.

11. The transducer film of claim 1, wherein electrode material is on both sides of the dielectric elastomer material, and wherein the extent of contact of partial discharge suppressant is different on each side of the dielectric elastomer material.

12. The transducer film of claim 1, wherein the partial discharge suppressant comprises one or more of a low-modulus solid, viscoelastic gel and dielectric liquid.

13. The transducer film of claim 1, wherein the partial discharge suppressant comprises particulates that do one or more of raise the dielectric constant, lower the resistivity of the suppressant, scavenge water vapor and scavenge oxygen.

14. The transducer film of claim 1, wherein the partial discharge suppressant has a minimum linear strain greater than about 5%.

15. The transducer film of claim 1, wherein the elastic modulus of the partial discharge suppressant is less than about 1 MPa.

16. The transducer film of claim 1, wherein the resistivity of the partial discharge suppressant is in the range from about 1E5 to about 1E14 □

m.

17. A transducer device comprising the transducer film of claim 1.