Microphones, plastics used

Because PVDF is piezoelectric, it can be used to construct a paper-thin microphone it responds to sound by producing a current proportional to the deformation caused by the sound waves. A ribbon of PVDF plastic one-quarter of an inch wide could be strung along a hallway and used to listen to all... 

Polymeric materials have been used to replace the external part of the ear (usually silicones) and also to replace the ossicles (PTFE, polyethylene, silicones) as well as serving as drainage tubes for the ear (ll). In addition some research has been done in which electrodes are implanted into the cochlea and are connected to an external microphone. Such devices have been able to restore a significant amount of hearing to deaf people. Plastics are used in these primarily as coatings for the wires and electronic parts (lU, 53, 5 ). 

J. F. Sear and R. Catpeniet, Noise cancelling microphone using a piezoelectric plastics transducing dement. EUxu Lett. 77 532 (1975). 

---