Capacitance dilatometry for the in-situ controlled expansion process of the cellular polymer-filler composites (ferroelectrets)

Johann Leonhartsberger, Harald Salhofer, Reinhard Schwödiauer, Simona Bauer-Gogonea, Siegfried Bauer, Reinhard Fostner, Gerhard Eder, Mika Paajanen, Hannu Minkkinen, Jaakko Raukola

Research output: Contribution to journalArticleScientificpeer-review

7 Citations (Scopus)

Abstract

Ferroelectrets are unusual composites, consisting of a closed-cell polymer-filler foam structure. Ferroelectrets behave like ferroelectric materials during and after internally charging the voids of the cellular structure. In order to optimize the electromechanical properties of ferroelectrets, the voids within the cellular polymer composite are expanded in a controlled manner in a high pressure gas chamber. Thereby, the gas pressure is first increased, subsequently released and finally the expanded structure is stabilized by a heat setting treatment at elevated temperatures. Capacitance dilatometry provides an easy means for the in-situ monitoring of the multi-step foaming process, and therefore allows for the control of the degree of foaming. The mechanical stabilization of the expanded cellular polymer composite structure is explained in terms of the enhanced crystallinity as a result of the heat setting process.
Original languageEnglish
Pages (from-to)181-187
Number of pages7
JournalFerroelectrics
Volume331
Issue number1
DOIs
Publication statusPublished - 2006
MoE publication typeA1 Journal article-refereed

Fingerprint

dilatometry
fillers
Fillers
Polymers
foaming
Capacitance
capacitance
expansion
composite materials
voids
Composite materials
polymers
Gases
heat
ferroelectric materials
composite structures
Composite structures
foams
Ferroelectric materials
gas pressure

Keywords

  • piezoelectricity
  • ferroelectricity
  • polymer-filler composites

Cite this

Leonhartsberger, J., Salhofer, H., Schwödiauer, R., Bauer-Gogonea, S., Bauer, S., Fostner, R., ... Raukola, J. (2006). Capacitance dilatometry for the in-situ controlled expansion process of the cellular polymer-filler composites (ferroelectrets). Ferroelectrics, 331(1), 181-187. https://doi.org/10.1080/00150190600737735
Leonhartsberger, Johann ; Salhofer, Harald ; Schwödiauer, Reinhard ; Bauer-Gogonea, Simona ; Bauer, Siegfried ; Fostner, Reinhard ; Eder, Gerhard ; Paajanen, Mika ; Minkkinen, Hannu ; Raukola, Jaakko. / Capacitance dilatometry for the in-situ controlled expansion process of the cellular polymer-filler composites (ferroelectrets). In: Ferroelectrics. 2006 ; Vol. 331, No. 1. pp. 181-187.
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abstract = "Ferroelectrets are unusual composites, consisting of a closed-cell polymer-filler foam structure. Ferroelectrets behave like ferroelectric materials during and after internally charging the voids of the cellular structure. In order to optimize the electromechanical properties of ferroelectrets, the voids within the cellular polymer composite are expanded in a controlled manner in a high pressure gas chamber. Thereby, the gas pressure is first increased, subsequently released and finally the expanded structure is stabilized by a heat setting treatment at elevated temperatures. Capacitance dilatometry provides an easy means for the in-situ monitoring of the multi-step foaming process, and therefore allows for the control of the degree of foaming. The mechanical stabilization of the expanded cellular polymer composite structure is explained in terms of the enhanced crystallinity as a result of the heat setting process.",
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Leonhartsberger, J, Salhofer, H, Schwödiauer, R, Bauer-Gogonea, S, Bauer, S, Fostner, R, Eder, G, Paajanen, M, Minkkinen, H & Raukola, J 2006, 'Capacitance dilatometry for the in-situ controlled expansion process of the cellular polymer-filler composites (ferroelectrets)', Ferroelectrics, vol. 331, no. 1, pp. 181-187. https://doi.org/10.1080/00150190600737735

Capacitance dilatometry for the in-situ controlled expansion process of the cellular polymer-filler composites (ferroelectrets). / Leonhartsberger, Johann; Salhofer, Harald; Schwödiauer, Reinhard; Bauer-Gogonea, Simona; Bauer, Siegfried; Fostner, Reinhard; Eder, Gerhard; Paajanen, Mika; Minkkinen, Hannu; Raukola, Jaakko.

In: Ferroelectrics, Vol. 331, No. 1, 2006, p. 181-187.

Research output: Contribution to journalArticleScientificpeer-review

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T1 - Capacitance dilatometry for the in-situ controlled expansion process of the cellular polymer-filler composites (ferroelectrets)

AU - Leonhartsberger, Johann

AU - Salhofer, Harald

AU - Schwödiauer, Reinhard

AU - Bauer-Gogonea, Simona

AU - Bauer, Siegfried

AU - Fostner, Reinhard

AU - Eder, Gerhard

AU - Paajanen, Mika

AU - Minkkinen, Hannu

AU - Raukola, Jaakko

N1 - Project code: K1SU00565

PY - 2006

Y1 - 2006

N2 - Ferroelectrets are unusual composites, consisting of a closed-cell polymer-filler foam structure. Ferroelectrets behave like ferroelectric materials during and after internally charging the voids of the cellular structure. In order to optimize the electromechanical properties of ferroelectrets, the voids within the cellular polymer composite are expanded in a controlled manner in a high pressure gas chamber. Thereby, the gas pressure is first increased, subsequently released and finally the expanded structure is stabilized by a heat setting treatment at elevated temperatures. Capacitance dilatometry provides an easy means for the in-situ monitoring of the multi-step foaming process, and therefore allows for the control of the degree of foaming. The mechanical stabilization of the expanded cellular polymer composite structure is explained in terms of the enhanced crystallinity as a result of the heat setting process.

AB - Ferroelectrets are unusual composites, consisting of a closed-cell polymer-filler foam structure. Ferroelectrets behave like ferroelectric materials during and after internally charging the voids of the cellular structure. In order to optimize the electromechanical properties of ferroelectrets, the voids within the cellular polymer composite are expanded in a controlled manner in a high pressure gas chamber. Thereby, the gas pressure is first increased, subsequently released and finally the expanded structure is stabilized by a heat setting treatment at elevated temperatures. Capacitance dilatometry provides an easy means for the in-situ monitoring of the multi-step foaming process, and therefore allows for the control of the degree of foaming. The mechanical stabilization of the expanded cellular polymer composite structure is explained in terms of the enhanced crystallinity as a result of the heat setting process.

KW - piezoelectricity

KW - ferroelectricity

KW - polymer-filler composites

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