MATERIALE PLASTICE ♦53♦No.2♦2016 http://www.revmaterialeplastice.ro 342 Synthesis and Characterization of HY Zeolite-doped Poly(aniline) by Chemical Oxidation Method ZOHRA GHEBACHE 1 , NACER-EDDINE DJELALI 1 *, SAFIDINE ZITOUNI 2 , FAHIM HAMIDOUCHE 1 1 Processing and Formatting Fibrous Polymers Laboratory (LTMFPF), Faculty of Engineering, University M’hamed Bougara, Boumerdes 2 Macromolecular Chemistry Laboratory, Polytechnic School of Algiers, Bordj-El-Bahri City, 16111, PoBox 17, Algiers, Algeria HY zeolite (solid acid) doped poly (aniline) has been synthesized through oxidative polymerization of aniline with ammouim peroxydisulfate used as an oxidant in aqueous medium. The influence of HYzeolite contents (5wt %, 10 wt %, 15wt %, 20wt % and 50 wt %) on the conductivity characteristic, thermal stability, and specific surface area of poly (aniline)/ HYzeolite composites was performed. All samples were characterized by FTIR, UV-Vis, XRD, TGA and SEM techniques. The electrical conductivity was measured using a four- probe method and it was found to be equal to 2.2 S/cm. FTIR spectra has confirmed the presence of poly (aniline) in the form of conducting emeraldine salt and suggest significant interaction of poly(aniline) with HY ze olite . Keywords: conducting polymer, PANI, doping, HY zeolite, conductivity In recent years, conducting polymers such as polyaniline, polypyrrole, polythiophene have received much attention because of their potential applications including anticorrosion coatings, batteries, supercapacitors, photovoltaic devices, photoluminescence devices and sensors [1-4]. Among these polymers, PANI has attracted significant attention because of its commercial viability, good electrical conductivity, and easy synthesis. However, there are also some disadvantages such as low chemical stability and mechanical strength that are unfavorable for PANI-related applications. It has been reported that organic–inorganic hybrid materials can synergize or complement the properties of the pure organic or inorganic materials[5,6]. Strong protonic acid solid such as HYzeolite lowed both the work function and increase the conductivity of poly (aniline) according to the known protonic form of doping mechanism, zeolites are nanoporous aluminosilicate materials in which the presence of aluminium atoms introduces charge defects that are compensated by non- framework cations[7,8]. One important topic in the search of zeolites is the characterization of Brønsted and Lewis acid centers. Zeolites are also well known as environmentally friendly acid solid [9-14]. In the present work, we have investigated structural, optical and electrical properties of chemically synthesized HY zeolite (acid solid) doped PANI composites. Experimental part Materials All chemical were used as they are received, aniline purchased from Merck (purity > 99%), zeolite NH 4 Y [Na 1 (NH 4 ) 52 , 33 Al 53 , 33 Si 138 , 6 7 O 384 ], zeolist international, SiO 2 /Al 2 O 3 = 5.2; Na 2 O = 0.2 %, Si/Al = 2.6 (ZEOLIST  ) were distained from Sigma Aldrich, Ammonium peroxide sulfate (APS) (purity ›99%) was supplied by Panerac, Chloroform (purity ›99.9%) and ammonia solution (with concentration fraction of 25% concentrated) were purchased from Fisher scientific. Methanol was obtained * email: djelnac@yahoo.fr from Biochem, and N-methyl-2-pyrolidone (NMP) were purchased from Biochem. Synthesis of zeolite doped PANI Pure PANI was synthesized at 0-5 °C by in-situ chemical oxidative polymerization method, described in several reports [15, 16]. The PANI/HYcomposite was also prepared by an in-situ chemical oxidation polymerization of aniline using different weight of HY zeolite acid solid (5%wt, 10%wt, 15%wt, 20%wt, 50%wt) as a doping agent, HY was prepared using thermal treatment of NH 4 Y according to the method described in [17] and the oxidizing solution of APS ((NH 4 ) 2 S 2 O 8 ) APS prepared into a ratio of [oxidant]/ [aniline] equal to 1.15. The 0.1 M of aniline was dissolved in 100 mL of distilled water solution and then mixed with 10 mL of HY zeolite for 30 min, the oxidizing solution was added drop wise under continuous mechanical stirring. After four hours, a good degree of polymerization is achieved and the dark green precipitate was recovered. The solution was left in undisturbed position over the night for the completion of chemical reaction. The produced precipitate in the reaction was removed by filtration, washed repeatedly with distil water, and dried under vacuum oven for 48h. Characterization Fourier transform infrared (FT-IR) spectra were obtained using a spectrometer type SHMADZU 8400S with a resolution of 1 cm -1 . All powders measurements were performed according to the absorption mode in spectroscopic grade KBr pellets. UV-Visible spectra of the deprotonated and protonated samples dissolved in N- methyl-2-pyrrolidone (NMP) were recorded using a UV-Vis Spectrometer type SHIMADZU UV-2401, in the wavelength range of 290–900 nm. Electrical conductivity of compressed pellets of the samples is measured using a Four-Point Probe (Model: RST-8 China) with a DC current source, at ambient temperature. Thermal stability of sample was performed on a thermogravimetric analyzer (Model: TG 209 F1 NETZSCH German). XRD patterns were recorded in the range of 5°-70°, 2θ region counting at every 0.02° with a PANalytical, X PerPRO X-ray diffractometer.