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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