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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, 1080-1089 p.Article in journal (Refereed)
Abstract [en]

For the use of poly(vinylidene fluoride) (PVDF) as a piezoelectric material, the processing must include formation of polar β-phase crystallites, as well as the application of electrically conducting charge collectors, i.e. electrodes. In the present paper, results from 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 of varying spinning velocities, draw rates and draw temperatures on the resulting crystalline structure are discussed. The results show that for maximum α-to-β phase transformation, cold drawing should take place at a temperature between 70-90°C and draw ratio as well as 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 the present work, melt spinning of bicomponent fibers with high β-phase PVDF in the sheath and a CB/PP core was successfully realized. The core material remained electrically conductive, this paving the way to using a CB-polymer compound as inner electrode in melt spinning of piezoelectric bicomponent fibers.

Place, publisher, year, edition, pages
Wiley Periodicals Inc. , 2011. Vol. 120, no 2, 1080-1089 p.
Keyword [en]
fibres, melt spinning, piezoelectric
National Category
Other Materials Engineering
Research subject
Textiles and Fashion (General)
Identifiers
URN: urn:nbn:se:hb:diva-3081DOI: 10.1002/app.33239Local ID: 2320/8001OAI: oai:DiVA.org:hb-3081DiVA: diva2:871177
Available from: 2015-11-13 Created: 2015-11-13

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Lund, Anja
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CiteExportLink to record
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Citation style
  • apa
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