Controlled inflation of voids in cellular polymer ferroelectrets: Optimizing electromechanical transducer properties

M. Wegener (Corresponding Author), W. Wirges, R. Gerhard-Multhaupt, M. Dansachmüller, R. Schwödiauer, S. Bauer-Gogonea, S. Bauer, Mika Paajanen, Hannu Minkkinen, Jaakko Raukola

Research output: Contribution to journalArticleScientificpeer-review

121 Citations (Scopus)

Abstract

When exposed to sufficiently high electric fields, polymer-foam electret materials with closed cells exhibit ferroelectric-like behavior and may therefore be called ferroelectrets. In cellular ferroelectrets, the influence of the cell size and shape distributions on the application-relevant properties is not yet understood. Therefore, controlled inflation experiments were carried out on cellular polypropylene films, and the resulting elastical and electromechanical parameters were determined. The elastic modulus in the thickness direction shows a minimum with a corresponding maximum in the electromechanical transducer coefficient. The resonance frequency shifts as a function of the elastic modulus and the relative density of the inflated cellular films. Therefore, the transducer properties of cellular ferroelectrets can be optimized by means of controlled inflation.
Original languageEnglish
Pages (from-to)392 - 394
Number of pages3
JournalApplied Physics Letters
Volume84
Issue number3
DOIs
Publication statusPublished - 2004
MoE publication typeA1 Journal article-refereed

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voids
modulus of elasticity
transducers
electrets
polymers
cells
polypropylene
foams
frequency shift
electric fields
coefficients

Keywords

  • polymer foams
  • polymer films
  • thin films
  • ferroelectric thin films
  • electrets
  • elastic moduli
  • dielectric resonance
  • piezoelectric transducers

Cite this

Wegener, M., Wirges, W., Gerhard-Multhaupt, R., Dansachmüller, M., Schwödiauer, R., Bauer-Gogonea, S., ... Raukola, J. (2004). Controlled inflation of voids in cellular polymer ferroelectrets: Optimizing electromechanical transducer properties. Applied Physics Letters, 84(3), 392 - 394. https://doi.org/10.1063/1.1641171
Wegener, M. ; Wirges, W. ; Gerhard-Multhaupt, R. ; Dansachmüller, M. ; Schwödiauer, R. ; Bauer-Gogonea, S. ; Bauer, S. ; Paajanen, Mika ; Minkkinen, Hannu ; Raukola, Jaakko. / Controlled inflation of voids in cellular polymer ferroelectrets : Optimizing electromechanical transducer properties. In: Applied Physics Letters. 2004 ; Vol. 84, No. 3. pp. 392 - 394.
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abstract = "When exposed to sufficiently high electric fields, polymer-foam electret materials with closed cells exhibit ferroelectric-like behavior and may therefore be called ferroelectrets. In cellular ferroelectrets, the influence of the cell size and shape distributions on the application-relevant properties is not yet understood. Therefore, controlled inflation experiments were carried out on cellular polypropylene films, and the resulting elastical and electromechanical parameters were determined. The elastic modulus in the thickness direction shows a minimum with a corresponding maximum in the electromechanical transducer coefficient. The resonance frequency shifts as a function of the elastic modulus and the relative density of the inflated cellular films. Therefore, the transducer properties of cellular ferroelectrets can be optimized by means of controlled inflation.",
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Wegener, M, Wirges, W, Gerhard-Multhaupt, R, Dansachmüller, M, Schwödiauer, R, Bauer-Gogonea, S, Bauer, S, Paajanen, M, Minkkinen, H & Raukola, J 2004, 'Controlled inflation of voids in cellular polymer ferroelectrets: Optimizing electromechanical transducer properties', Applied Physics Letters, vol. 84, no. 3, pp. 392 - 394. https://doi.org/10.1063/1.1641171

Controlled inflation of voids in cellular polymer ferroelectrets : Optimizing electromechanical transducer properties. / Wegener, M. (Corresponding Author); Wirges, W.; Gerhard-Multhaupt, R.; Dansachmüller, M.; Schwödiauer, R.; Bauer-Gogonea, S.; Bauer, S.; Paajanen, Mika; Minkkinen, Hannu; Raukola, Jaakko.

In: Applied Physics Letters, Vol. 84, No. 3, 2004, p. 392 - 394.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Controlled inflation of voids in cellular polymer ferroelectrets

T2 - Optimizing electromechanical transducer properties

AU - Wegener, M.

AU - Wirges, W.

AU - Gerhard-Multhaupt, R.

AU - Dansachmüller, M.

AU - Schwödiauer, R.

AU - Bauer-Gogonea, S.

AU - Bauer, S.

AU - Paajanen, Mika

AU - Minkkinen, Hannu

AU - Raukola, Jaakko

N1 - Project code: D1SU00565

PY - 2004

Y1 - 2004

N2 - When exposed to sufficiently high electric fields, polymer-foam electret materials with closed cells exhibit ferroelectric-like behavior and may therefore be called ferroelectrets. In cellular ferroelectrets, the influence of the cell size and shape distributions on the application-relevant properties is not yet understood. Therefore, controlled inflation experiments were carried out on cellular polypropylene films, and the resulting elastical and electromechanical parameters were determined. The elastic modulus in the thickness direction shows a minimum with a corresponding maximum in the electromechanical transducer coefficient. The resonance frequency shifts as a function of the elastic modulus and the relative density of the inflated cellular films. Therefore, the transducer properties of cellular ferroelectrets can be optimized by means of controlled inflation.

AB - When exposed to sufficiently high electric fields, polymer-foam electret materials with closed cells exhibit ferroelectric-like behavior and may therefore be called ferroelectrets. In cellular ferroelectrets, the influence of the cell size and shape distributions on the application-relevant properties is not yet understood. Therefore, controlled inflation experiments were carried out on cellular polypropylene films, and the resulting elastical and electromechanical parameters were determined. The elastic modulus in the thickness direction shows a minimum with a corresponding maximum in the electromechanical transducer coefficient. The resonance frequency shifts as a function of the elastic modulus and the relative density of the inflated cellular films. Therefore, the transducer properties of cellular ferroelectrets can be optimized by means of controlled inflation.

KW - polymer foams

KW - polymer films

KW - thin films

KW - ferroelectric thin films

KW - electrets

KW - elastic moduli

KW - dielectric resonance

KW - piezoelectric transducers

U2 - 10.1063/1.1641171

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Wegener M, Wirges W, Gerhard-Multhaupt R, Dansachmüller M, Schwödiauer R, Bauer-Gogonea S et al. Controlled inflation of voids in cellular polymer ferroelectrets: Optimizing electromechanical transducer properties. Applied Physics Letters. 2004;84(3):392 - 394. https://doi.org/10.1063/1.1641171