Simulation of space charge deposition by barrier discharges in piezoelectric polymer foams

S. Harris, O. Mellinger, A. Mellinger

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

Fig. 2 shows the deposited space charge as a function of pressure p and void height. When V reaches its positive maximum in the charging cycle for the second time, the larger voids (with heights above approx. 12 μm) are charged with a density in excess of 1 mC/m2. The charging of smaller voids is strongly dependent on pressure, as shown by the Paschen curves in the inset of Fig. 3. As p is increased above 100 kPa, their breakdown field decreases towards a minimum, allowing these voids to be charged. However, if p is increased past the minimum of Ec, the increase in the breakdown field reduces the deposited charge according to (1). Therefore, the piezoelectric coefficient shows a pronounced maximum when plotted as a function of pressure (Fig. 3). For cellular polypropylene (PP) film from VTT Processes, Finland (OW50 grade), the optimum charging pressure is 274 kPa, while for inflated PQ-50 film (Nan Ya Plastics, Taiwan), a value of approx. 170 kPa was found. At this pressure, d33 has increased its value at atmospheric pressure by 50 to 120% (depending on the material), in good agreement with experimental findings [10]. After V is brought back to zero, the field generated by the deposited charges causes secondary breakdowns (so-called back discharges [11]), reducing the effective charge density. Again, elevated pressure is beneficial as the higher critical field in the large voids reduces the amount of back discharging.

Original languageEnglish
Title of host publication2011 - 14th International Symposium on Electrets, ISE 2011
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages83-84
Number of pages2
ISBN (Print)9781457710230
DOIs
StatePublished - 2011
Event2011 IEEE 14th International Symposium on Electrets, ISE 2011 - Montpellier, France
Duration: Aug 28 2011Aug 31 2011

Publication series

NameProceedings - International Symposium on Electrets

Conference

Conference2011 IEEE 14th International Symposium on Electrets, ISE 2011
Country/TerritoryFrance
CityMontpellier
Period08/28/1108/31/11

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