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

doi:10.1080/00150190600737735

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 journal › Article › Scientific › peer-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 language	English
Pages (from-to)	181-187
Number of pages	7
Journal	Ferroelectrics
Volume	331
Issue number	1
DOIs	https://doi.org/10.1080/00150190600737735
Publication status	Published - 2006
MoE publication type	A1 Journal article-refereed

Keywords

piezoelectricity
ferroelectricity
polymer-filler composites

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10.1080/00150190600737735

Cite this

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

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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author = "Johann Leonhartsberger and Harald Salhofer and Reinhard Schw{\"o}diauer and Simona Bauer-Gogonea and Siegfried Bauer and Reinhard Fostner and Gerhard Eder and Mika Paajanen and Hannu Minkkinen and Jaakko Raukola",

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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

U2 - 10.1080/00150190600737735

DO - 10.1080/00150190600737735

M3 - Article

SN - 0015-0193

VL - 331

SP - 181

EP - 187

JO - Ferroelectrics

JF - Ferroelectrics

IS - 1

ER -

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

Abstract

Keywords

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