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The purpose of this study was to improve the dielectric, magnetic, and thermal properties of polytetrafluoroethylene (PTFE) composites using recycled Fe 2 O 3 (rFe 2 O 3 ) nanofiller. Hematite (Fe 2 O 3 ) was recycled from mill scale waste and the particle size was reduced to 11.3 nm after 6 h of high-energy ball milling. Different compositions (5-25 wt %) of rFe 2 O 3 nanoparticles were incorporated as a filler in the PTFE matrix through a hydraulic pressing and sintering method in order to fabricate rFe 2 O 3 -PTFE nanocomposites. The microstructure properties of rFe 2 O 3 nanoparticles and the nanocomposites were characterized through X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), and high-resolution transmission electron microscopy (HRTEM). The thermal expansion coefficients (CTEs) of the PTFE matrix and nanocomposites were determined using a dilatometer apparatus. The complex permittivity and permeability were measured using rectangular waveguide connected to vector network analyzer (VNA) in the frequency range 8.2-12.4 GHz. The CTE of PTFE matrix decreased from 65.28×10-6/°C to 39.84×10-6/°C when the filler loading increased to 25 wt %. The real ( ε ') and imaginary ( ε ″) parts of permittivity increased with the rFe 2 O 3 loading and reached maximum values of 3.1 and 0.23 at 8 GHz when the filler loading was increased from 5 to 25 wt %. A maximum complex permeability of 1.1-j0.07 was also achieved by 25 wt % nanocomposite at 10 GHz.

Effects of Recycled Fe2O3 Nanofiller on the Structural, Thermal, Mechanical, Dielectric, and Magnetic Properties of PTFE Matrix