387386 Polyaniline Metal Oxides Nanocomposites with Unique Physicochemical Properties

Tuesday, November 18, 2014: 10:36 AM
International 8 (Marriott Marquis Atlanta)
Xi Zhang, Integrated Composites Laboratory (ICL), Dan F. Smith Department of Chemical Engineering, Lamar university, Beaumont, TX, Charles Huynh, Beaumont, Lamar University, 77710-0053, TX, Suying Wei, Department of Chemistry and Biochemistry, Lamar University, Beaumont, TX and John Zhanhu Guo, Dan F. Smith Department of Chemical Engineering, Lamar University, Beaumont, TX

The unique physicochemical properties of polyaniline (PANI)/metal oxides polymer nanocomposites (PNCs) were systematically studied with the PNCs containing different kinds of metal oxides. PANI PNCs with non magnetic nanoparticles (NPs)-barium titanate (BaTiO3) and magnetic NPs-manganese ferrite (MnFe2O4) were synthesized by a surface initiated polymerization method. Giant magnetoresistance (GMR) was observed in the PNCs, and the value was found to depending on the species and the loading of NPs. With the magnetic field of 9E5 Oe, the GMR can reach to -34% for PNCs with 30.0 wt% MnFe2O4 NPs and 30% for PNCs with 1.0 wt% BaTiO3 NPs. And the positive and negative GMR was analyzed theoretically from the wave functional shrinkage model and forward interference model, respectively. Compared with the negative real permittivity of PNCs with BaTiO3 NPs, all the PNCs with MnFe2O4 NPs showed high positive dielectric permittivity and high dielectric loss value, which is due to the interfacial polarization. The electron transportation behavior of the PNCs was studied and for both PNCs, the temperature dependent resistivity result reveals a 3-d variable range hopping (VRH) electron transport mechanism. By varying the loading level of NPs, the crystalline structure, thermal stability and morphology of the PNCs were also systematically studied. And the peak shift observed in the FT-IR spectra of both PNCs indicated a strong interaction between the formed PANI and the metal oxides NPs.

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See more of this Session: Synthesis and Applications of Oxide Materials
See more of this Group/Topical: Materials Engineering and Sciences Division