Synthesis of Polyaneline

Topics: Scanning electron microscope, Polymer, Nanocomposite Pages: 5 (1618 words) Published: January 25, 2013
SYNTHESIS AND CHARACTERIZATION OF POLYANILINE/POLY (P-HYDROXYANILINE)/Fe3O4 MAGNETIC NANOCOMPOSITE M. R. SABOKTAKIN, A. M. MAHARRAMOV, M. A. RAMAZANOV Baku State University, Baku, Azarbaijan E-mail: Several composites have been studied for static dissipationand microwave absorbing materials based on polyaniline with metallic oxides. These composites which are conducting polymers have been widely used because of their lower density as well their good environmental stability as in the case of polyaniline (PAN). In the present work , in situ polymerization of aniline was carried out in the presence of Fe3O4 nano particles to synthesize polyaniline/Poly(p-hydroxyaniline)/ Fe3O4 (PAN/PHAN/ Fe3O4) composites. The composites,thus synthesized have been characterized by Fourier transfer infrared(FTIR) spectrophotometer and X-ray diffraction . The morphology of these composites was studied by scanning electron microscopy. (Received September 29, 2009; accepted October 23, 2009) Keywords: Conductivity , polyaniline ,poly(p-hydroxyaniline), Fe3O4 , nanocomposites .

1. Introduction Nowadays the conducting polymers offers a great technological application potential in several areas [1-3], can be cited : static films for transparent packaging of electronic components , electromagnetic shielding , rechargeable batteries, light–emitting diodes, nonlinear optical devices, sensor for medicine and pharmaceutics apparatus, membranes for separation of gas mixture, protection against corrosion, conducting paints and glues and others. The most important application of these polymers is like radar (microwave) adsorbing materials [4].These polymers are generally prepared by adding fillers ina polymeric matrix. One very common way, among the several methods fir preparing conducting polymer blends or composites, is by mechanical mixing of the components[5]. Great interest has been focused on polyaniline (PAN) and Poly(p-hydroxyaniline) (PHAN), within the field of conducting polymers, due to important characteristics that it presents: its conductive form has excellent chemical stability combined with relatively easy, inexpensive and with high – yield. These blends may combine the desired properties of two components ,the electrical conductivity of polyaniline/poly(p-hydroxyaniline) with the physical and mechanical properties of the polymeric matrix[6-7]. We have been studied some microwave absorption properties of polyaniline / Poly(phydroxyaniline) with Fe3O4 nanoparticles[8] . 2. Experimental Nano particles of Fe3O4 were purchased from nanotechnology center of Baku State University. The particles have an average of 10-12 nm. Aniline and 4-aminophenol were purchased from Aldrich chemicals. Aniline was purified by distillation under vacuum. Ammonium persulfate. The images of nanoparticles were investigated using Philips XL30 scanning electron microscope.The Fourier transfer infrared(FTIR , Bruker )spectroscopy was used to identified the polymer on the Fe3O4 nano particles surface.Specta were obtained in the wave number range of 400-4000 cm-1. Spectra of the polyaniline modified Fe3O4 nanoparticles were recorded from KBr in 1:10 (wt/wt) ratio. HCl 1M solution (100 cm3) was prepared. Add 0.558 gram of aniline to solution, and stir for 4 hours. Dissolve 0.006 mol potassium persulfate (KS2O8) with 10 ml distilled water. Mix these two solutions to start the polymerization reaction. The solution turned to dark green. Stir for 24 hours to obtain a homogeneous solution of the polymeric matrix. The polymeric matrix is a dispersion of particle of 100-200 nm in diameter. The infrared absorption spectra of the matrix are consistent with the structure of polyaniline. Stir Fe3O4 dispersive solution with sodium dodecyl sulfate / distillaed water with mechanical stirring. A diluted solution of the PAN polymer is then mixed with Fe3O4 solution (25% Fe3O4) for 10 minutes . The average molar ratio of the components is PAN: Fe3O4 = 1:2 . The...
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