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Melt spinning of β-phase poly(vinylidene fluoride) yarns with and without a conductive core
University of Borås.
RISE, Swerea, Swerea IVF.
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)
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. © 2010 Wiley Periodicals, Inc.

Place, publisher, year, edition, pages
2011. Vol. 120, no 2, p. 1080-1089
Keywords [en]
fibers, morphology, WAXS
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:ri:diva-13362DOI: 10.1002/app.33239Scopus ID: 2-s2.0-78650861829OAI: oai:DiVA.org:ri-13362DiVA, id: diva2:973568
Available from: 2016-09-22 Created: 2016-09-22 Last updated: 2017-11-21Bibliographically approved

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