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Melt spinning of beta-phase poly(vinylidene fluoride) yarns with and without a conductive core
University of Borås, Swedish School of Textiles.
2011 (English)In: Journal of Applied Polymer Science, ISSN 0021-8995, E-ISSN 1097-4628, Vol. 120, no 2, p. 1080-1089Article in journal (Refereed) Published
Abstract [en]

When poly(vinylidene fluoride) (PVDF) is to be used as a piezoelectric material, the processing must include the formation of polar β-phase crystallites, as well as the application of electrically conducting charge collectors, that is, electrodes. In this article, results from the melt spinning of PVDF yarns and a novel bicomponent PVDF-yarn with a conductive carbon black/polypropylene (CB/PP) core are presented. Melt spinning has been done under conditions typical for industrial large-scale fiber production. The effects on the resulting crystalline structure of varying the spinning velocity, draw rate, and draw temperature are discussed. The results show that, for maximum α-to-β phase transformation, cold drawing should take place at a temperature between 70 and 90°C, and both the draw ratio and the draw rate should be as high as possible. It was observed that the cold drawing necessary to form β-phase crystallinity simultaneously leads to a decrease in the core conductivity of the bicomponent yarns. In this work, the melt spinning of bicomponent fibers with high-β-phase PVDF in the sheath and a CB/PP core was successfully accomplished. The core material remained electrically conductive, paving the way for the use of a CB-polymer compound as inner electrode in the melt spinning of piezoelectric bicomponent fibers.

Place, publisher, year, edition, pages
Wiley Periodicals, Inc. , 2011. Vol. 120, no 2, p. 1080-1089
Keywords [en]
fibers, morphology, WAXS, Smart textiles
National Category
Materials Engineering
Research subject
Textiles and Fashion (General)
Identifiers
URN: urn:nbn:se:hb:diva-1351DOI: 10.1002/app.33239Local ID: 2320/11586OAI: oai:DiVA.org:hb-1351DiVA, id: diva2:869375
Available from: 2015-11-13 Created: 2015-11-13 Last updated: 2017-12-10Bibliographically approved

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Lund, Anja

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CiteExportLink to record
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  • apa
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  • vancouver
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  • de-DE
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