The Piezoelectrically-generated pressure-step method (PPS)
The knowledge about polarization or space-charge distribution in charged polar polymers (polyvinylidene fluoride PVDF, piezo- and pyroelectric material) or in non-polar polymers (polytetrafluoroethylene PTFE, TeflonTM, electret material) is of general interest, both for fundamental research and for applications.
Certain molecular groups act as dipoles and can be oriented in an electric field (permanent polarization).
Certain non-polar polymer materials exhibit excellent charge-storage properties (electret materials).
Depending on the material and the poling or charging conditions we get different polarization or charge profiles:
The PPS method allows for direct determination of polarization or charge profiles in the thickness direction of thin (10-100 µm) dielectrics.
How does the PPS method work? Continue on the next page...