Fecha de publicación: -- Fuente: Journal of applied polymer Lugar: RESEARCH ARTICLE PVDF-HFP films and fiber mats, with/without GO, were produced by various techniques.

Samples were characterized at RT by dielectric and Raman spectroscopies.

From dielectric spectra, PVDF β phase is dominant in investigated insulator samples.

Raman spectra well agree with dielectric data and confirm a good GO insertion.

In the electrically conductive PVDF-HFP-GO film, the α phase content increases.


ABSTRACT
Poly(vinylidenefluoride-co-hexafluoropropylene) (PVDF-HFP) and graphene oxide (GO) were utilized to produce four types of samples: PVDF-HFP films, PVDF-HFP/GO films, PVDF-HFP fiber mats and PVDF-HFP/GO fiber mats. The so-obtained samples were characterized at room temperature by dielectric and Raman spectroscopies and the deduced results were compared with each other. Since the PVDF-HFP/GO films were found to be electrically conductive, they were not included in the comparative dielectric characterization. The real part ε
1 of permittivity, the loss tangent tan𝛿 and the ac electrical conductivity 𝜎
ac of PVDF-HFP films, PVDF-HFP fiber mats and PVDF-HFP/GO fiber mats were analyzed as a function of frequency in the (103÷106) Hz range. The obtained dielectric data have suggested that in PVDF-HFP films, PVDF-HFP fiber mats and PVDF-HFP/GO fiber mats the PVDF β-phase is dominant. This suggestion was confirmed by the relative Raman spectra performed in the (380÷3250) cm−1 range. In PVDF-HFP/GO films the β phase content decreased in favor of the α phase in disagreement with the literature, even if the presence of well-defined D, G and 2D bands demonstrated that GO was successfully incorporated in PVDF-HFP film. The performed dielectric and Raman spectra are presented and discussed.