Thermal and Temporal Stability of Ferroelectret Films Made from Cellular Polypropylene/Air Composites

Mellinger, Axel; Wegener, Michael; Wirges, Werner; Mallepally, Rajendar R.; Gerhard, Reimund

doi:10.1080/00150190600737933

Cited by 65 publications

(44 citation statements)

References 18 publications

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“…As can be seen, d 33 constant is bigger for composites than for PVDF film. It reaches 40 pC/N for lower stress and falls The studies concerning possibility of obtaining composites, based on PP, having high piezoelectric constants were suggested earlier by other authors [31,32]. The obtained value of d 33 was several times smaller than that for PP after double expansion process [3,4].…”

Section: Piezoelectrical Propertiesmentioning

confidence: 91%

New piezoelectric composites based on isotactic polypropylene filled with silicate

Kaczmarek

Królikowski

Klimiec

et al. 2017

J Mater Sci: Mater Electron

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Section: Piezoelectrical Propertiesmentioning

confidence: 91%

New piezoelectric composites based on isotactic polypropylene filled with silicate

Kaczmarek

Królikowski

Klimiec

et al. 2017

J Mater Sci: Mater Electron

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“…[7,8,9] We note that high values of the voltage coefficient have been reported for ferroelectret polymers, i.e. soft electroactive films, [10][11][12] but applications are hampered by discharging at elevated temperature. [13] The most widely studied, [14,15] commercially available, [16] polymer is the piezoelectric homopolymer polyvinylidenefluoride (PVDF) and its random copolymer with trifluoroethylene (P(VDF-TrFE) kV.…”

Section: Introductionmentioning

confidence: 99%

Flexible Piezoelectric Touch Sensor by Alignment of Lead‐Free Alkaline Niobate Microcubes in PDMS

Deutz

Mascarenhas

Schelen

et al. 2017

Adv Funct Materials

112

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This state-of-the-art value outperforms bulk piezoelectric ceramics and composites with randomly dispersed particles, and is comparable to the values reported for the piezoelectric polymers PVDF and P(VDF-TrFE). Optimized composite films are incorporated in flexible piezoelectric touch sensors. The high sensitivity is analyzed and discussed. As the fabrication technology is straightforward and easy to implement, applications are foreseen in flexible electronics such wireless sensor networks and biodiagnostics.

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“…7,8 In addition, most of the piezoelectric sensitivity is already lost between 60 and 70°C in polypropylene ͑PP͒ ferroelectrets. 9 Consequently, cellular-foam ferroelectrets with higher thermal stability have been developed from polyethylene terephthalate ͑PET͒ and polyethylene naphthalate ͑PEN͒ by means of physical foaming with supercritical carbon dioxide. 10,11 The polyester ferroelectrets exhibit slightly higher thermal and long-term stabilities that are, however, still not sufficient for many practical applications.…”

Section: Introductionmentioning

confidence: 99%

Template-based fluoroethylenepropylene piezoelectrets with tubular channels for transducer applications

Altafim¹,

Qiu²,

Wirges³

et al. 2009

Journal of Applied Physics

Self Cite

144

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Polarization switching at the nanoscale in ferroelectric copolymer thin films Appl. Phys. Lett. 99, 142904 (2011) Tunable temperature dependence of electrocaloric effect in ferroelectric relaxor poly(vinylidene fluoridetrifluoroethylene-chlorofluoroethylene terpolymer Appl. Phys. Lett. 99, 052907 (2011) Beneficial and detrimental fatigue effects of dielectric barrier discharges on the piezoelectricity of polypropylene ferroelectrets J. Appl. Phys. 110, 024108 (2011) Energy harvesting by nonlinear capacitance variation for a relaxor ferroelectric poly(vinylidene fluoridetrifluoroethylene-chlorofluoroethylene) terpolymer Appl. Phys. Lett. 98, 222901 (2011) Photocrosslinking of ferroelectric polymers and its application in three-dimensional memory arrays Appl. Phys. Lett. 98, 183302 (2011) Additional information on J. Appl. Phys. We describe the concept, the fabrication, and the most relevant properties of a piezoelectric-polymer system: Two fluoroethylenepropylene ͑FEP͒ films with good electret properties are laminated around a specifically designed and prepared polytetrafluoroethylene ͑PTFE͒ template at 300°C. After removing the PTFE template, a two-layer FEP film with open tubular channels is obtained. For electric charging, the two-layer FEP system is subjected to a high electric field. The resulting dielectric barrier discharges inside the tubular channels yield a ferroelectret with high piezoelectricity. d 33 coefficients of up to 160 pC/N have already been achieved on the ferroelectret films. After charging at suitable elevated temperatures, the piezoelectricity is stable at temperatures of at least 130°C. Advantages of the transducer films include ease of fabrication at laboratory or industrial scales, a wide range of possible geometrical and processing parameters, straightforward control of the uniformity of the polymer system, flexibility, and versatility of the soft ferroelectrets, and a large potential for device applications e.g., in the areas of biomedicine, communications, production engineering, sensor systems, environmental monitoring, etc.

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Thermal and Temporal Stability of Ferroelectret Films Made from Cellular Polypropylene/Air Composites

Cited by 65 publications

References 18 publications

New piezoelectric composites based on isotactic polypropylene filled with silicate

New piezoelectric composites based on isotactic polypropylene filled with silicate

Flexible Piezoelectric Touch Sensor by Alignment of Lead‐Free Alkaline Niobate Microcubes in PDMS

Template-based fluoroethylenepropylene piezoelectrets with tubular channels for transducer applications

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