Poly(vinyl alcohol) (PVA) loaded with vanadium pentoxide (V 2 O 5 ) nanoparticles was successfully prepared at room temperature and ambient pressure. Transmission electron microscopy was used to characterize the final product. It was found that V 2 O 5 nanoparticles were well dispersed and uniform in shape and that the diameter of the particles was confined to within 8 nm. Addition of small amounts (0.2-1 wt%) of nanoparticulate V 2 O 5 to PVA increased the electrical conductivity as well as the modulus of elasticity. The deformation behaviour after preparing the nanocomposites, irrespective of V 2 O 5 concentration, is similar to that of the unfilled elastomer, implying that the mechanism of large deformation is mainly governed by the matrix.

The interest to ferrite nanoparticles (NPs) is thriving because of their unique applications in life industry. Doping of rubber composites by nanoparticles results in a novel characteristics which is not exist either in the ferrite or rubber alone. In this study, zinc ferrite NPs have been synthesized via sol–gel technique. These nanoferrites embedded into acrylonitrile butadiene rubber (NBR) at different concentrations. The morphology and structure of zinc ferrite and zinc ferrite NPs doped NBR were investigated using X‐ray diffraction and transmission electron microscopy. The influence of zinc ferrite NPs loading on the thermal stability showed that the zinc ferrite enhanced the thermal stability and reduced the rate of thermal degradation of rubber nanocomposites. The effect of zinc ferrite NPs on the mechanical properties of NBR showed that the hardness, tear strength, and tensile stress are improved. The magnetic measurements of these nanocomposites showed that the saturation magnetization is enhanced as the concentration of zinc ferrite NPs increased into NBR nanocomposites. The EPR spectra of zinc ferrite NPs doped NBR indicated that the increase in zinc ferrite NPs content resulted in an increase in the g‐factor and line width. POLYM. COMPOS., 2012. © 2012 Society of Plastics Engineers

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