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Dielectric relaxation and resonance spectra of ferroelectric polyamide 11

: Frübing, P.; Kremmer, A.; Ganster, J.; Pissis, P.; Gerhard-Multhaupt, R.

Fleming, R.J. ; IEEE Dielectrics and Electrical Insulation Society:
11th International Symposium on Electrets (ISE 11). Proceedings : 1 - 3 October 2002, Novotel Hotel, Glen Waverley, Melbourne, Australia
Piscataway, NJ: IEEE, 2002
ISBN: 0-7803-7560-2
International Symposium on Electrets (ISE) <11, 2002, Melbourne>
Fraunhofer IAP ()

Ferroelectric polyamide 11 films were prepared by melt-quenching, cold-drawing and electrical poling. Ferroelectricity was checked by dielectric-hysteresis measurements. Dielectric spectroscopy was applied for determining piezoelectric constants from thickness-extension resonances as well as for investigating conformational changes due to quenching, stretching and electrical poling. A remanent polarisation of up to 35 mC/m2, a coercive field of 75 MV/m and a piezoelectric d33 coefficient of 2.7 pC/N were obtained. In the ferroelectric film, the dielectric relaxation is suppressed whereas the relaxation is enhanced.