Abstract
Polypyrrole/hematite magnetic composites are prepared by simple chemical oxidation method with different weight percentages of hematite (0–30 wt %) in polypyrrole (PPy) matrix during in situ polymerization of monomers. The as-synthesized composites are characterized by thermogravimetric analysis, differential scanning calorimetry, vibrating sample magnetometry analysis and dielectric studies. Thermal stability is improved in all the prepared composites. Enhanced AC conductivity and thermal stability in PPy/10% of hematite composite is attributed to the homogeneous dispersion of incorporated hematite particles in PPy matrix, physiochemical interactions and development of interface regions between organic polymer structure and inorganic hematite particles. Interestingly, the organic conducting polymer matrix reinforcement with inorganic hematite dispersive particles is found to transform it from weak antiferromagnetic to ferromagnetic in the range of 10 kOe with coercivity and saturation magnetization as a function of the inorganic phase loading percentage.
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