Magnetite enhanced PVDF EMI shielding material

“

The enhanced dispersion of nanofillers in the PVDF matrix was confirmed by high-resolution transmission electron microscopy (HRTEM), field emission scanning electron microscopy (FESEM) and impedance analyses. The hybrid nanocomposites contain predominantly the electroactive gamma phase of PVDF as confirmed by X-ray diffraction (XRD), Fourier transform infra-red spectroscopy (FTIR) and differential scanning calorimetry (DSC) analyses. The solution blended, 0.1 mm thick PVDF–9 wt% CNF–3 wt% Fe3O4 hybrid nanocomposite film exhibits an electromagnetic interference shielding effectiveness (EMI SE) of 17.1 dB at 10 GHz dominated by absorption phenomenon. Additionally, the onset and main chain degradation temperatures of PVDF in the hybrid nanocomposites (with 1 and 3 wt% Fe3O4) are increased by more than 40 °C compared to PVDF–9 wt% CNF nanocomposites with 1 wt% PVP. The storage modulus of the hybrid nanocomposites was increased to about 164.2% at 40 °C in comparison to neat PVDF film with PVP as evidenced by dynamical mechanical analysis (DMA). Thus, the solution blended PVDF–CNF–Fe3O4 hybrid nanocomposite film with improved electrical, mechanical, thermal and EMI shielding properties can be used for microwave absorption application.

”