Vinylidene fluoride and trifluoroethylene containing polymers

1. A polymer comprising recurring units derived from vinylidene fluoride (VDF) and trifluoroethylene (TrFE), said polymer comprising end groups of formula —CF 2 H and/or —CF 2 CH 3 in a combined amount of at least 60 mmoles per kg of VDF recurring units [polymer (F)].

2. The polymer of claim 1 , comprising 10 to 50% by moles of recurring units derived from TrFE.

3. The polymer of claim 2 , consisting essentially of:

from 10 to 50% by moles of recurring units derived from TrFE; and

from 50 to 90% moles of recurring units derived from VDF.

4. The polymer of claim 2 , consisting essentially of:

from 15 to 40% by moles of recurring units derived from TrFE;

from 55 to 76% moles of recurring units derived from VDF; and

from 5 to 16% by moles of recurring units derived from chlorotrifluoroethylene (CTFE).

5. The polymer of claim 1 , comprising at least 70 mmoles per kg of VDF recurring units of end groups of formula —CF 2 H and/or —CF 2 CH 3 .

6. The polymer of claim 1 , having a Melt Flow Index (MFI) determined according to ASTM D 1238 (230° C./5 kg) of from 0.5 to 500 g/10 min.

7. The polymer of claim 1 , being in the form of substantially bidimensional parts.

8. An electric or electronic device in which the polymer (F) of claim 1 is used as ferroelectric, piezoelectric, dielectric or pyroelectric material.

9. The device according to claim 8 , being selected from the group consisting of transducers, sensors, actuators, ferroelectric memories, and capacitors.

10. The device according to claim 8 , wherein the polymer (F) comprised in said device is in the form of substantially bidimensional parts.

11. The device according to claim 10 , wherein the substantially bidimensional parts are films or sheets.