  Thermoplastic elastomeric nanocomposites based on poly(trimethylene
terephthalate-block-poly(tetramethylene oxide) copolymer (PTT-PTMO) and
graphene oxide-Fe3O4 nanoparticle hybrid were prepared by in situ
polymerization. Superparamagnetic GO-Fe3O4 hybrid nanoparticles before
introducing to elastomeric matrix were characterized by X-ray photoelectron
spectroscopy (XPS), X-ray diffraction (XRD), thermogravimetric analysis (TGA)
and scanning electron microscopy (SEM). The effect of loading (0.3 and 0.5 wt%)
of GO-Fe3O4 nanoparticle hybrid on the phase structure, tensile and magnetic
properties of synthesized nanocomposites was investigated. The phase structure
of nanocomposites was evaluated by differential scanning calorimetry (DSC) and
dynamic mechanical thermal analysis (DMTA). Dispersion of GO-Fe3O4
nanoparticles in elastomeric matrix was evaluated by transmission electron
microscopy (TEM). Magnetic properties of GO-Fe3O4 nanoparticle hybrid and
nanocomposites with their content were characterized by using two different
techniques: dc SQUID magnetization measurements as a function of temperature
(from 2 to 300 K) and external magnetic field and ferromagnetic resonance (FMR)
at microwave frequency.
