Preparation and assessment of piezo- and pyroelectric poly (vinylidene fluoride-hexafluoropropylene) copolymer films |
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Authors: | W Künstler M Wegener M Seiß R Gerhard-Multhaupt |
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Institution: | (1) Applied Condensed Matter Physics, University of Potsdam, Am Neuen Palais 10, 14469 Potsdam, Germany, DE |
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Abstract: | Films of poly(vinylidene fluoride-hexafluoropropylene) copolymer P(VDF-HFP)] were cast from a dimethylsulfoxide (DMSO)/acetone
solution of Solef?85-15 P(VDF-HFP) copolymer powder grade 21508. Undrawn and uniaxially drawn cast copolymer films were investigated
with respect to their piezo- and pyroelectric properties. Quasistatic charge integration was employed for the determination
of the poling-field dependence of the piezoelectric d31 and pyroelectric p3 coefficients. In addition, the thermal stability of the pyroelectric effect was studied with a combination of thermally stimulated
discharge (TSD) and temperature-modulation techniques. Cast copolymer films could withstand electrical poling fields of up
to 400 MV/m. The maximum values of d31=30 pC/N and p3=49 μC/(m2K) for uniaxially drawn samples are similar to those found on commercial PVDF films and much higher than those on pure PVDF
films cast from solution. Samples kept for 5 min at 150 °C still exhibit 30–40% of the initial pyroelectric effect up to
around 20 μC/(m2K)]. After this annealing step, no further decay of the pyroelectric coefficient could be observed during storage at 120 °C
for several hours.
Received: 5 July 2001 / Accepted: 27 July 2001 / Published online: 2 October 2001 |
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Keywords: | PACS: 77 84 Jd 81 05 Lg 77 65 Bn 77 70 +a |
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