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The effect of fibre concentration on the α to β-phase transformation, degree of crystallinity and electrical properties of vapour grown carbon nanofibre/poly(vinylidene fluoride) composites

Journal Article


Abstract


  • Vapour growth carbon nanofibres/poly(vinilidene fluoride) - VGCNF/PVDF - composites prepared by solution casting were studied. The spherulitic crystallisation morphology of the pure polymer is maintained for the composites. Mechanical stretching of the composite films induces the α to β-phase transformation within the polymer matrix. This phase transition is accompanied by the destruction of the spherulitic microstructure in favour of a microfibrillar one. The incorporation of the VGCNF in the PVDF matrix increases the degree of crystallinity of the polymer composites for concentrations lower than ∼1%, remaining stable for higher VGCNF concentrations. With respect to the electrical properties, the stretching associated to the phase transformation induces a change in the conduction mechanism: the α-phase composite demonstrates a percolative behaviour on the measured conductivity whereas the β-phase demonstrates typical ionic conduction behaviour. Dielectric measurements in conjunction with the the two exponent percolation phenomenological equation demonstrates that in the β-phase an effective reduction in the ratio VGCNF length/domain length could induce the observed percolation behaviour.

UOW Authors


  •   Costa, P (external author)
  •   Silva, J P. (external author)
  •   Gomes da Silva Sencadas, Vitor
  •   Costa, Carlos M. (external author)
  •   Van Hattum, F W. (external author)
  •   Rocha, José Gerardo (external author)
  •   Lanceros-Méndez, Senentxu (external author)

Publication Date


  • 2009

Published In


Citation


  • Costa, P., Silva, J., Sencadas, V., Costa, C. M., Van Hattum, F. W.J., Rocha, J. G. & Lanceros-Méndez, S. (2009). The effect of fibre concentration on the α to β-phase transformation, degree of crystallinity and electrical properties of vapour grown carbon nanofibre/poly(vinylidene fluoride) composites. Carbon, 47 (11), 2590-2599.

Scopus Eid


  • 2-s2.0-67649884552

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/3737

Number Of Pages


  • 9

Start Page


  • 2590

End Page


  • 2599

Volume


  • 47

Issue


  • 11

Abstract


  • Vapour growth carbon nanofibres/poly(vinilidene fluoride) - VGCNF/PVDF - composites prepared by solution casting were studied. The spherulitic crystallisation morphology of the pure polymer is maintained for the composites. Mechanical stretching of the composite films induces the α to β-phase transformation within the polymer matrix. This phase transition is accompanied by the destruction of the spherulitic microstructure in favour of a microfibrillar one. The incorporation of the VGCNF in the PVDF matrix increases the degree of crystallinity of the polymer composites for concentrations lower than ∼1%, remaining stable for higher VGCNF concentrations. With respect to the electrical properties, the stretching associated to the phase transformation induces a change in the conduction mechanism: the α-phase composite demonstrates a percolative behaviour on the measured conductivity whereas the β-phase demonstrates typical ionic conduction behaviour. Dielectric measurements in conjunction with the the two exponent percolation phenomenological equation demonstrates that in the β-phase an effective reduction in the ratio VGCNF length/domain length could induce the observed percolation behaviour.

UOW Authors


  •   Costa, P (external author)
  •   Silva, J P. (external author)
  •   Gomes da Silva Sencadas, Vitor
  •   Costa, Carlos M. (external author)
  •   Van Hattum, F W. (external author)
  •   Rocha, José Gerardo (external author)
  •   Lanceros-Méndez, Senentxu (external author)

Publication Date


  • 2009

Published In


Citation


  • Costa, P., Silva, J., Sencadas, V., Costa, C. M., Van Hattum, F. W.J., Rocha, J. G. & Lanceros-Méndez, S. (2009). The effect of fibre concentration on the α to β-phase transformation, degree of crystallinity and electrical properties of vapour grown carbon nanofibre/poly(vinylidene fluoride) composites. Carbon, 47 (11), 2590-2599.

Scopus Eid


  • 2-s2.0-67649884552

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/3737

Number Of Pages


  • 9

Start Page


  • 2590

End Page


  • 2599

Volume


  • 47

Issue


  • 11