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Title: Melt spinning of beta-phase poly(vinylidene fluoride) yarns with and without a conductive core
Authors: Lund, Anja
Hagström, Bengt
Department: University of Borås. Swedish School of Textiles
Issue Date: 2011
Journal Title: Journal of applied polymer science
ISSN: 0021-8995
Volume: 120
Issue: 2
Pages: 1080-1089
Publisher: Wiley Periodicals, Inc.
Media type: text
Publication type: article, peer reviewed scientific
Keywords: fibers
Subject Category: Subject categories::Engineering and Technology::Materials Engineering
Area of Research: Smart textiles
Strategic Research Area: Textiles and fashion
Abstract: 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.
DOI: 10.1002/app.33239
Sustainable development: -
Appears in Collections:Artiklar och rapporter / Articles and reports (THS)

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