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Low cost, large area, lightweight, stretchable ferroelectrets have been fabricated by using commercially available irradiation cross-linked polypropylene (IXPP) foam sheets. Quasi-static piezoelectric d33 coefficients up to 400 pC/N are achieved, which are pressure independent in the range of applied pressure from 1 to 36 kPa. The piezoelectric performance in such IXPP films is well retained for the...
Commercially available polytetrafluoroethylene (PTFE) films, composed of a porous PTFE core and two compact PTFE cover layers, were made piezoelectric (i.e. ferroelectrets) by corona charging. Most of the internal charges probably reside on the inner surfaces of the compact PTFE layers. Typical quasi-static piezoelectric d33 coefficients are in the range of 1000-2000 pC/N at an applied pressure of...
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