TY - GEN
T1 - Ferroelectrets
T2 - 2005 12th International Symposium on Electrets, ISE 12
AU - Wegener, M.
AU - Wirges, W.
AU - Mellinger, A.
AU - Winkler, M.
AU - Gerhard-Multhaupt, R.
PY - 2005
Y1 - 2005
N2 - In ferroelectrets, the piezoelectricity is based on bipolar charging of voids in the foam structure, which then represent (macroscopic) dipoles. It was found that inflation by gas-diffusion expansion is an useful processing step in order to optimize the cellular structure by adjusting the void heights (dipole sizes) and the elastic and piezoelectric properties. Here, we describe the inflation of cellular PP films over a range from the initial film thickness with flat lens-like voids to six-fold film thicknesses with spherical voids. We analyze the resulting void sizes and void-size distributions as well as electrical, elastic and piezoelectric properties of the differently inflated films. Furthermore, the penetration dynamics of different gases such as nitrogen and sulfur hexafluoride into the voided structure are investigated.
AB - In ferroelectrets, the piezoelectricity is based on bipolar charging of voids in the foam structure, which then represent (macroscopic) dipoles. It was found that inflation by gas-diffusion expansion is an useful processing step in order to optimize the cellular structure by adjusting the void heights (dipole sizes) and the elastic and piezoelectric properties. Here, we describe the inflation of cellular PP films over a range from the initial film thickness with flat lens-like voids to six-fold film thicknesses with spherical voids. We analyze the resulting void sizes and void-size distributions as well as electrical, elastic and piezoelectric properties of the differently inflated films. Furthermore, the penetration dynamics of different gases such as nitrogen and sulfur hexafluoride into the voided structure are investigated.
UR - http://www.scopus.com/inward/record.url?scp=33847719843&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:33847719843
SN - 0780391160
SN - 9780780391161
T3 - Proceedings - International Symposium on Electrets
SP - 141
EP - 144
BT - 2005 12th International Symposium on Electrets, ISE 12 - Proceedings
Y2 - 11 September 2005 through 14 September 2005
ER -