Synthesis and characterization of a novel paramagnetic polyaniline composite with uniformly distributed metallic nanoparticles sandwiched between polymer matrices

摘要

Polyaniline (PANI) is among one of the most extensively studied electroconductive polymers. The present study involves synthesis of novel sandwiched PANI composite, where cobalt complexes were embedded in between PANI layers. Uniform dispersion of complex on polyaniline matrix was carried out in ace-tonitrile at room temperature via magnetic agitation of polyemeraldine base and Co-complex solution mixtures. Spectroscopic studies (FT-IR, FT-Raman, UV-vis and ~(15)N MAS NMR) have evidenced the interaction of Co-complex with the N-backbone of polymeric chain. The lamellar structure of composite as well as existence of metal containing spherical nanoparticles of Co[SalophH_2]~(2+) ions between them were detected in TEM micrographs with average diameter of 4.78 nm. The thermogravimetric analysis of the prepared nanocomposite displayed four stages of degradation between 29.4 and 897.2℃ with considerable thermal stability. Moreover, determination of magnetic properties of all the prepared materials showed that PANI-Co[SalophH_2]-PANl composite has paramagnetic behavior, while PANI and its emaral-dine base were diamagnetic in nature at room temperature. Thus, the present study holds promise for thermal purposes and magnetic applications of cobalt containing polyaniline composites.