Abstract
After proper electric charging, polymer foams show the behavior similar to ferroelectric material. Since the charged polymer foams combine the characteristics of ferroelectric materials (hysteresis loop) and electrets (surplus charges), they are named ferroelectrets. This paper introduces a method of preparation of laminated polytetrafluoroethylene (PTFE) and fluoroethylenepropylene (FEP) films with cellular structure. The character of such ferroelectret is that the layers of compact FEP are the electrets storing charges and the layers of porous PTFE are the framework of the cellular structure. The results show the quasi-static piezoelectric d33 coefficients of the laminated films are up to 200-500pC/N and relatively independent on the static applied pressure in the range of 12kPa; after 160 minutes of aging d33 of the complex films can retain 43% of the original and tends to stabilization.
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