Broadband dielectric spectroscopy of nanocomposites based on PVDF and expanded graphite

A Linares (1) , J C Canalda (1) , A Sanz (1) , A Szymczyk (2) , Z Rosłaniec (2) , T A Ezquerra (1)

1 Instituto de Estructura de la Materia (IEM-CSIC)
2 West Pomeranian University of Technology Szczecin

Nanocomposites based on poly (vinylidene fluoride) (PVDF) and expanded graphite (EG) were prepared by non-solvent precipitation from solution with different EG concentrations. Films were obtained by compression molding and their structural and dielectric properties studied. From Wide Angle X-ray Scattering (WAXS) experiments, it can be assessed that for all EG concentrations the -crystalline phase of PVDF is the predominant crystalline form. However, for composites with high nanoadditive content, higher than 3 wt.%, the -crystalline phase is also detected. Dielectric spectroscopy results showed that the nanocomposites present both high dielectric constant and electrical conductivity at low percolation threshold.

Mots clés: Soft matter; liquids and polymers Condensed matter: electrical; magnetic and optical Condensed matter: structural; mechanical & thermal Nanoscale science and low-D systems

Domaines: Matériaux; Physique [physics]

A Linares, J C Canalda, A Sanz, A Szymczyk, Z Rosłaniec, et al.. Broadband dielectric spectroscopy of nanocomposites based on PVDF and expanded graphite. IOP Conference Series: Materials Science and Engineering, 2014, 64, pp.012003. ⟨10.1088/1757-899X/64/1/012003⟩. ⟨hal-01115969⟩