Synthesis and Characterization of Novel Magnetic Poly(urethane-imide)/Fe3O4@SiO2–NH2 Nanocomposites

Resumo

Poly(urethane-imide)/Fe₃O₄@SiO₂–NH₂ nanocomposites were synthesized by the reaction of 4,4′-diphenylmethane diisocyanate (MDI), polypropylene glycol (PPG), 4,4'-(hexafluoroisopropylidene) diphthalic anhydride and Fe₃O₄@SiO₂–NH₂ nanoparticles in propylene carbonate (PC) as an alternative green solvent. Poly(urethane-imide)s combined with Fe₃O₄@SiO₂–NH₂ nanoparticles (NPs) at various NPs ranging from loadings levels of 0.5 and 3.5 pbw were prepared and characterized by fourier transform infrared spectroscopy (FT-IR), proton nuclear magnetic resonance spectroscopy (¹H NMR), thermogravimetric analysis (TGA), X-ray diffraction (XRD) and vibrating sample magnetometery (VSM). The results showed the performances of Fe₃O₄@SiO₂–NH₂ nanoparticles in improving of thermal resistance and magnetic properties of PUI/Fe₃O₄@SiO₂–NH₂ in comparison with pristine poly(urethane-imide).