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Local variation of the dielectric properties of poly(vinylidene fluoride) during the α- to β-phase transformation

Journal Article


Abstract


  • The phase transformation from the non-polar α-phase to the polar electroactive β-phase of polyvinylidene fluoride (PVDF) has been investigated using the fluorescence from Nile red. Films of α-PVDF doped with Nile red were stretched at controlled rates at a temperature of 80 °C to produce the α- to β-phase transition. The thermo/mechanical dependent changes in the crystalline structure are related to the physical rotation of the polar (CH2-CF2) group, which can be monitored by steady state fluorescence techniques. The degree of phase transformation is related to variation in the fluorescence, which in turn is linked to local dielectric constant of the polymer. The variation of the refractive index is more associated to the alignment of the polymeric chains than to the phase transformation. Thus, fluorescence is a suitable technique to monitor phase transitions coupled to a variation in the polarity of the dielectric medium.

UOW Authors


  •   Martins, P (external author)
  •   Nunes, J S. (external author)
  •   Hungerford, Graham A. (external author)
  •   Miranda, D (external author)
  •   Ferreira, A (external author)
  •   Gomes da Silva Sencadas, Vitor
  •   Lanceros-Méndez, Senentxu (external author)

Publication Date


  • 2009

Citation


  • Martins, P., Nunes, J. Serrado., Hungerford, G., Miranda, D., Ferreira, A., Sencadas, V. & Lanceros-Méndez, S. (2009). Local variation of the dielectric properties of poly(vinylidene fluoride) during the α- to β-phase transformation. Physics Letters A: General Physics, Nonlinear Science, Statistical Physics, Atomic, Molecular and Cluster Physics, Plasma and Fluid Physics, Condensed Matter, Cross-disciplinary Physics, Biological Physics, Nanosciences, Quantum Physics, 373 (2), 177-180.

Scopus Eid


  • 2-s2.0-57549100412

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/3742

Number Of Pages


  • 3

Start Page


  • 177

End Page


  • 180

Volume


  • 373

Issue


  • 2

Abstract


  • The phase transformation from the non-polar α-phase to the polar electroactive β-phase of polyvinylidene fluoride (PVDF) has been investigated using the fluorescence from Nile red. Films of α-PVDF doped with Nile red were stretched at controlled rates at a temperature of 80 °C to produce the α- to β-phase transition. The thermo/mechanical dependent changes in the crystalline structure are related to the physical rotation of the polar (CH2-CF2) group, which can be monitored by steady state fluorescence techniques. The degree of phase transformation is related to variation in the fluorescence, which in turn is linked to local dielectric constant of the polymer. The variation of the refractive index is more associated to the alignment of the polymeric chains than to the phase transformation. Thus, fluorescence is a suitable technique to monitor phase transitions coupled to a variation in the polarity of the dielectric medium.

UOW Authors


  •   Martins, P (external author)
  •   Nunes, J S. (external author)
  •   Hungerford, Graham A. (external author)
  •   Miranda, D (external author)
  •   Ferreira, A (external author)
  •   Gomes da Silva Sencadas, Vitor
  •   Lanceros-Méndez, Senentxu (external author)

Publication Date


  • 2009

Citation


  • Martins, P., Nunes, J. Serrado., Hungerford, G., Miranda, D., Ferreira, A., Sencadas, V. & Lanceros-Méndez, S. (2009). Local variation of the dielectric properties of poly(vinylidene fluoride) during the α- to β-phase transformation. Physics Letters A: General Physics, Nonlinear Science, Statistical Physics, Atomic, Molecular and Cluster Physics, Plasma and Fluid Physics, Condensed Matter, Cross-disciplinary Physics, Biological Physics, Nanosciences, Quantum Physics, 373 (2), 177-180.

Scopus Eid


  • 2-s2.0-57549100412

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/3742

Number Of Pages


  • 3

Start Page


  • 177

End Page


  • 180

Volume


  • 373

Issue


  • 2