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  • 1.
    Guo, Zengwei
    et al.
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Nilsson, Erik
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Rigdahl, M.
    Chalmers University of Technology.
    Hagström, Bengt
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Melt spinning of PVDF fibers with enhanced β phase structure2013In: Journal of Applied Polymer Science, ISSN 0021-8995, E-ISSN 1097-4628, Vol. 130, no 4, p. 2603-2609Article in journal (Refereed)
    Abstract [en]

    Polyvinylidene fluoride (PVDF) fibers with a high amount of β phase crystal structure were prepared by melt spinning. With this technique, the cold drawing process is critical and efficient when aiming for a high amount of β phase. During the cold drawing process, more than 80% of the originally formed α phase crystal structure was converted into the β phase structure. In addition, the incorporation of 0.01 wt % of amino-modified double wall carbon nanotube (NH2-DWCNT) could further enhance the β phase content in the PVDF fibers. FTIR and DSC studies showed that the addition of NH2-DWCNT to PVDF fibers could increase both the total crystallinity and β phase fraction in PVDF. The addition of nanoclay was found to be less efficient in this respect. © 2013 Wiley Periodicals, Inc.

  • 2. Lund, A
    et al.
    Nilsson, Erik
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Hagström, Bengt
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Melt spun piezoelectric textile fibres demonstrated2013Conference paper (Other academic)
  • 3.
    Nilsson, Erik
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    On the development of novel piezoelectric fibre sensor2012Conference paper (Other academic)
  • 4.
    Nilsson, Erik
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Piezoelektrisk textilfiber för medicinska applikationer2013Conference paper (Other academic)
  • 5.
    Nilsson, Erik
    et al.
    RISE - Research Institutes of Sweden, Swerea.
    Lund, A
    Elektriskt ledande textil värmer dig och kollar din puls2013Conference paper (Other academic)
  • 6.
    Nilsson, Erik
    et al.
    RISE - Research Institutes of Sweden, Materials and Production, IVF.
    Lund, Anja
    Chalmers University of Technology, Sweden.
    Jonasson, C.
    RISE, Swedish ICT, Acreo.
    Johansson, C.
    RISE, Swedish ICT, Acreo.
    Hagström, Bengt
    RISE - Research Institutes of Sweden, Materials and Production, IVF.
    Poling and characterization of piezoelectric polymer fibers for use in textile sensors2013In: Sensors and Actuators A-Physical, ISSN 0924-4247, E-ISSN 1873-3069, Vol. 201, p. 477-486Article in journal (Refereed)
    Abstract [en]

    This study reports on the poling and characteristics of a melt-spun piezoelectric bicomponent fiber with poly(vinylidene fluoride) (PVDF) as its sheath component and a conductive composite with carbon black (CB) and high density polyethylene (HDPE) as its core component. The influence of poling conditions on the piezoelectric properties of the fibers has been investigated. The poling parameters temperature, time and poling voltage have been varied and the piezoelectric effect of both contact- and corona-poled yarns have been evaluated. The results show that a high piezoelectric effect is achieved when the poling voltage is high as possible and the poling temperature is between 60° C and 120 °C. It was also shown that permanent polarization is achieved in a time as short as 2 s in corona-poled fibers. A yarn exposed to a sinusoidal axial tension of 0.07% strain (the corresponding force amplitude was 0.05 N) shows an intrinsic voltage output of 4 V. The mean power from a 25 mm length of yarn is estimated to be 15 nW. To demonstrate the fibers sensor properties, they are woven into a textile fabric from which a force sensor is manufactured and used to detect the heartbeat of a human. © 2013 Elsevier B.V. All rights reserved.

  • 7.
    Nilsson, Erik
    et al.
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Rundqvist, K
    Lund, A
    Piezoelectric textilefibers in different weave constructions for sensor application2013Conference paper (Other academic)
  • 8.
    Rundqvist, Karin
    et al.
    University of Borås, Sweden.
    Sandsjö, Leif
    University of Borås, Sweden.
    Lund, Anja
    University of Borås, Sweden.
    Persson, Nils-Krister
    University of Borås, Sweden.
    Nilsson, Erik
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Hagström, Bengt
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Registrering av fotnedsättning baserat på piezoelektriska fibrer2014Conference paper (Other academic)
  • 9.
    Åkerfeldt, Maria
    et al.
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF. University of Borås.
    Nilsson, Erik
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF. Chalmers University of Technology.
    Gillgard, Philip
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Walkenström, Pernilla
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Textile piezoelectric sensors – melt spun bi-component poly(vinylidene fluoride) fibres with conductive cores and poly(3,4-ethylene dioxythiophene)-poly(styrene sulfonate) coating as the outer electrode2014In: Fashion and Textiles, ISSN 2198-0802, Vol. 1, no 13Article in journal (Refereed)
    Abstract [en]

    The work presented here addresses the outer electroding of a fully textile piezoelectric strain sensor, consisting of bi-component fibre yarns of β-crystalline poly(vinylidene fluoride) (PVDF) sheath and conductive high density polyethylene (HDPE)/carbon black (CB) core as insertions in a woven textile, with conductive poly(3,4-ethylene dioxythiophene)-poly(styrene sulfonate) (PEDOT:PSS) coatings developed for textile applications. Two coatings, one with a polyurethane binder and one without, were compared for the application and evaluated as electrode material in piezoelectric testing, as well as tested for surface resistivity, tear strength, abrasion resistance and shear flexing. Both coatings served their function as the outer electrodes in the system and no difference in this regard was detected between them. Omission of the binder resulted in a surface resistivity one order of magnitude less, of 12.3 Ω/square, but the surface resistivity of these samples increased more upon abrasion than the samples coated with binder. The tear strength of the textile coated with binder decreased with one third compared to the uncoated substrate, whereas the tear strength of the coated textile without binder increased with the same amount. Surface resistivity measurements and scanning electron microscopy (SEM) images of the samples subjected to shear flexing showed that the coatings without the binder did not withstand this treatment, and that the samples with the binder managed this to a greater extent. In summary, both of the PEDOT:PSS coatings could be used as outer electrodes of the piezoelectric fibres, but inclusion of binder was found necessary for the durability of the coating.

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