Synthesis, characterization and properties of polystyrene/NiO nanocomposites

  • Esmaiel Soleimani
  • Mostafa Mohammadi


In this study, polystyrene (PSt)/NiO nanocomposites (NCs) were prepared in three stages. First, NiO2 was prepared by the reaction of Ni(NO3)2⋅6H2O with sodium hypochlorite in the present of CTAB in alkaline solution, and then its oxidation by ethanol, obtained NiO nanoparticles (NPs). Second, the surface of NiO NPs was modified in order to obtain better dispersity and proper compatibility in organic media by oleic acid. Surface modification of NiO NPs was confirmed through lipophilic degree (LD). The results revealed that LD increased with the rising amount of modifier up to 5 wt%. Optimum modification was obtained at 65 °C and 4 h for reaction time. Third, the modified NiO NPs were dispersed in styrene monomer, and PSt/NiO NCs were synthesized via miniemulsion polymerization. The NiO NPs, its modified NPs and PSt/NiO NCs were characterized by XRD, FT-IR, FE-SEM, EDX, XPS and VSM. The average crystallite sizes of NiO were calculated to be 14 nm from XRD patterns. The results of EDX analysis and FT-IR spectra showed that chains of oleic acid have been successfully grafted on surface of NiO NPs. The morphological observation revealed that NiO NPs were embedded homogeneously in the inner part of polystyrene. Thermal stability of PSt/NiO NCs was studied using techniques of TGA and DSC. Compared to polystyrene, PSt/NiO NCs prepared by this method increased the glass transition temperature to 29 °C and increased the thermal degradation temperature that to 45 °C. The VSM results showed that the NiO NPs and PSt/NiO NCs have super paramagnetic properties.



The authors would like to thank the Research Council of Shahrood University of Technology for the financial support of this work.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.


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Authors and Affiliations

  1. 1.Inorganic Chemistry Research Laboratory, Faculty of ChemistryShahrood University of TechnologyShahroodIran

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