Gas diffusion expansion-increased thickness and enhanced electromechanical response of cellular polymer electret films

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

54 Citations (Scopus)

Abstract

With a high-pressure gas treatment it is possible to force extra gas inside a cellular polymer film structure, expand the film and thus reduce the film stiffness. A permanent increase in the film thickness can be in the range of 100% when using ambient temperature of about 90°C and gas pressure of about 20 bar during an 8-min long gas expansion process. High-pressure treatment at lower temperatures will increase the elastic nature of the film expansion and thus decrease the permanent increase in the film thickness. The results show that a clear increase in the electromechanical response up to 480 or 330 pCN-1 was achieved with 45 or 60 µm thick polypropylene sample films, respectively. The corresponding gas contents were 48 and 39%, respectively.
Original languageEnglish
Title of host publicationProceedings, 11th International Symposium on Electrets
PublisherIEEE Institute of Electrical and Electronic Engineers
Pages191-194
ISBN (Print)0-7803-7560-2
DOIs
Publication statusPublished - 2002
MoE publication typeA4 Article in a conference publication
Event11th International Symposium on Electrets, ISE11 - Melbourne, Australia
Duration: 1 Oct 20023 Oct 2002

Conference

Conference11th International Symposium on Electrets, ISE11
CountryAustralia
CityMelbourne
Period1/10/023/10/02

Keywords

  • cellular film
  • gas content
  • electret
  • piezoelectricity
  • gas diffusion expansion

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    Paajanen, M., Minkkinen, H., & Raukola, J. (2002). Gas diffusion expansion-increased thickness and enhanced electromechanical response of cellular polymer electret films. In Proceedings, 11th International Symposium on Electrets (pp. 191-194). IEEE Institute of Electrical and Electronic Engineers. https://doi.org/10.1109/ISE.2002.1042976