Fluorinated cyclic olefin electret film

1. A fluorinated cyclic olefin electret film comprising: a fluorinated cyclic olefin polymer film characterized by having a cyclic olefin polymer grafted with a fluorocarbon alkyl group; and a parylene film over the fluorinated cyclic olefin polymer film.

2. The fluorinated cyclic olefin electret film according to claim 1 , wherein the fluorocarbon alkyl group is grafted on a monomer segment of the cyclic olefin polymer, and the monomer segment comprises at least one of ethylene, propylene, α-olefin and cyclic olefin monomers.

3. The fluorinated cyclic olefin electret film according to claim 1 , wherein the parylene film comprises at least one of parylene N, parylene D and parylene C.

4. The fluorinated cyclic olefin electret film according to claim 1 , wherein the parylene film comprises para-xylylene with at least one of cyano or dicyano substituents.

5. The fluorinated cyclic olefin electret film according to claim 1 , wherein the parylene film the parylene film comprises para-xylylene with at least one of fluorine and chlorine atoms as substituents.

6. The fluorinated cyclic olefin electret film according to claim 1 , wherein the parylene film is formed by evaporation over the fluorinated cyclic olefin polymer.

7. The fluorinated cyclic olefin electret film according to claim 1 , wherein the parylene film has a thickness of about 0.1 to 10 μm.

8. The fluorinated cyclic olefin electret film according to claim 1 further comprising a conductive film on one side of the fluorinated cyclic olefin polymer film.

9. A composition comprising:

about 10% to about 99.5% by weight of a thermoplastic resin; and

about 0.05 to about 90% by weight of the fluorinated cyclic olefin electret film according to claim 1 .