Magnetic Nanoparticles In Polymers
New magnetic nanomaterials have been synthesized from ferrocene-containing polyphenylenes. The cyclotrimerization of 1,1-diacetylferrocene by condensation reaction catalyzed by p-toluenesulfonic acid in the presence of triethyl orthoformiate both in solution and supercritical carbon dioxide in the temperature range of 70-200ºC is described. The highly branched ferrocene-containing polyphenylenes prepared by this procedure were used as precursors for preparing magnetic nanomaterials. This was achieved by thermal treatment of polyphenylenes in the range of 200-750ºC. The emerging of crystal magnetite nanoparticles of magnetite with the average size of 6 to 22 nm distributed in polyconjugated carbonized matrix was observed due to crosslinking and thermal degradation of polyphenylene prepolymers. Saturation magnetization of such materials came up to 32 Gsּcm3/g in a filed of 2.5 kOe.