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Melt spinning of potentially electroactive textile fibres
University of Borås, Swedish School of Textiles.
2009 (English)Conference paper, Poster (Other academic)
Abstract [en]

Poly(vinylidene fluoride) (PVDF) is a polymorphic polymer which, when made to crystallize in its polar form, yields piezo- and pyroelectric properties. In recent years PVDF has found its way towards intelligent textile applications, as researchers have attempted to create e.g. sensors for cardiorespiratory monitoring and energy harvesting by adding a commercially available PVDF film to a textile material. Present work is a first step towards constructing an electroactive fibre or yarn for true integration into textile materials. Important factors for achieving a fibre with useful electromechanical response, are high crystallinity and high content of polar β phase crystallites. The present study attempted to find how the spinning and drawing parameters should be adjusted to achieve such properties. Experimental results showed that crystallinity can be increased significantly (up to 90% crystalline content) by increasing melt draw ratio during spinning. The fibres drawn only in the melt showed mainly non-polar α phase crystallinity, and it was necessary to add a subsequent cold drawing step in which α- to β-phase conversion occurred. It was further seen that while a high crystallinity has a negative effect on the maximum draw ratio of fibres, an increase in the draw ratio during cold drawing had a positive effect on the conversion from α to the β form. Thus there seems to be an antagonistic effect between high degree of crystallinity and high degree of polar crystallites. An interesting finding was that an increased deformation speed during cold drawing appeared to promote conversion to the β form. The results indicate that with some fine-tuning of melt spinning and cold drawing parameters, it is possible to produce PVDF fibres with high crystallinity (above 80%) and almost completely in the β-form.

Place, publisher, year, edition, pages
The polymer processing society , 2009.
Keyword [en]
melt spinning, PVDF, Textile technology
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:hb:diva-6275Local ID: 2320/5839OAI: oai:DiVA.org:hb-6275DiVA: diva2:886962
Conference
Europe/Africa regional meeting of the Polymer Processing Society for 2009, Larnaca, Cyprus
Available from: 2015-12-22 Created: 2015-12-22 Last updated: 2016-07-15Bibliographically approved

Open Access in DiVA

sammanfattning(58 kB)41 downloads
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Type summaryMimetype application/pdf

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Lund, Anja
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CiteExportLink to record
Permanent link

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Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf