Study On The Synthesis And Electromagnetic Properties Of Polypyrrole/Fe₃O₄ Nanocomposites

Conducting polymer-inorganic nanocomposites have received great research attention across the fields of Physical chemistry, Polymeric chemistry and materials chemistry, because they combine the merits of the inorganic materials and the organic polymers, exhibiting the good optical, electrical, mechanical, magnetic properties. Polypyrrole (PPy) have been extensively studied due to their adjustable conductivity, good environment stability and relatively easy preparation.In this article, Polypyrrole has been synthesized by the way of chemical oxidation, The materials were analyzed and studied referring to SEM,FTIR,XRD, four probe conductance law and coaxial transmission method law. The result show that:(1) The faction, such as oxidant, Time placed in the air etc. influence the conductance of Polypyrrole. Meanwhile, the conductance of Polypyrrole has distributed near the 101s/cm, which was in the range of semiconductor material. (2) The infrared emittance of polypyrrole has distributed between 0.6 and 0.8, and microwave absorbing has distributed between-1.2dB and-6dB. The electrical properties of polypyrrole is better than the magnetic properties.The Fe3O4 nanoparticles with about 57nm dismeter were firstly prepared with titration method, then the polypyrrole/Fe3O4 nanoparticles were synthesized in the suspen-sion solution of Fe3O4 nanoparticles via in situ chemical oxidative polymerization under the direction of cationic surfactant. Meanwhile, the structures and properties of the nanocomposites were studied. The result show that:(1) There were interactions between Fe3O4 nanoparticles and PPy, which made that pyr role monomer pol ymerize prefe rentially at the surfaces of the Fe3O4 nanoparticles so that the Fe3O4 nanoparticles were coated by PPy. When coated Fe3O4 nanoparticles, the conductance of composite material was very low conductivity change, which was in the range of non-conductor material. (2) The infrared emittance of composite material became poor. The magnetic loss of composite material has inproved, and the dielectric loss was not reduced. The magnetic loss and the dielectric loss of composite material was better than that of polyrrple.