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Nickel ferrite loaded (NiFe2O4) segmented polyurethane (SPU) nanocomposites prepared by melt mixing method using microcompounder at temperature 185 °C in recirculation mode to ensure proper dispersion and distribution of nanoparticles at optimized residency time of 5 min. Three different weight percentages of nanocomposites (3, 5, and 10 wt %) was prepared and studied the electromagnetic property of nanocomposites obtained from complex permittivity and permeability. The effect of nanofiller (NiFe2O4) has been studied to assess their thermal properties using thermogravimetric analysis, differential scanning calorimetry, and thermomechanical analysis. The nanocomposites (NiFe2O4/SPU) have further been studied using FE‐SEM, and the micrographs show embedded NiFe2O4 filler uniformly dispersed in SPU matrix without agglomeration (size 20–40 nm). It is also evident that further loading of nanofiller resulted in saturation effect yielding no applicable change in thermal behavior and revealed lesser melting enthalpy due to the coalescence of the nanofillers. X‐ray diffraction and vibrating sample magnetometer also support the formation of the nanocomposite. The electric and magnetic properties of NiFe2O4 incorporated nanocomposite (NiFe2O4/SPU) may have potential application in microwave absorption. © 2020 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 137, 48645. [ABSTRACT FROM AUTHOR]

In this study, nanocomposites of Ni0.5Zn0.5Fe2O4/polyurethane were prepared by melt mixing method and determined the influence of amount of Ni0.5Zn0.5Fe2O4 (0, 0.5, 1, 2, and 3 wt%) fillers on magnetic induction of segmented polyurethane composites with optimum processing conditions. The obtained nanocomposites particles of all the samples were characterized by TGA (Thermogravimetric Analysis), DSC (Differential Scanning Calorimetry), XRD (X-Ray Diffraction), FTIR (Fourier transform infrared spectroscopy), SEM (Scanning electron microscopy) and Hysteresis measurements (P-E Loop tracer) & VSM (Vibrating Sample Magnetometer). XRD showed the strong characteristic diffraction peaks for ferrite while diffused diffraction pattern for polyurethane. Moreover on increasing nano fillers concentration causes the agglomeration in the composites owing to irregular distribution and consequently the strength of the material reduced. FTIR spectroscopy showed that the positions of peaks for distinctive functional groups of both ferrite and SPU. Micrographs showed that Ferrite/SPU nanocomposites having good dispersion of filler in matrix. [ABSTRACT FROM AUTHOR]