%0 Journal Article
%T Poly Meta-Aminophenol: Chemical Synthesis, Characterization and Ac Impedance Study
%A Thenmozhi Gopalasamy
%A Mohanraj Gopalswamy
%A Madhusudhana Gopichand
%A Jayasanthi Raj
%J Journal of Polymers
%D 2014
%R 10.1155/2014/827043
%X The present work is an investigation of AC impedance behaviour of poly(meta-aminophenol). The polymer was prepared by oxidative chemical polymerization of meta-aminophenol in aqueous HCl using ammonium persulfate as an oxidant at 0¨C3¡ãC. The synthesized polymer was characterized by GPC, Elemental analysis, UV-VIS-NIR, FT-IR, 1H NMR, XRD, SEM, and TGA-DTA. The AC conductivity and dielectric response were measured at a temperature range from 303 to 383£¿K in the frequency range of 20£¿Hz to 106£¿Hz. The AC conductivity data could be described by the relation , where the parameter ¡° ¡± and values decrease in the entire range of study and hence follow Correlated Barrier Hopping conduction mechanism. Both dielectric constant and dielectric loss increase with the decrease of frequency exhibiting strong interfacial polarization at low frequency and the dissipation factor also decreases with frequency. Complex electric modulus and dissipation factor exhibit two relaxation peaks, indicating two-phase structure as indicated by a bimodal distribution of relaxation process. The activation energies corresponding to these two relaxation processes were found to be 0.07 and 0.1£¿eV. 1. Introduction Conducting polymers such as polyaniline, polythiophene, and polypyrrole are the subject of scientific interest due to their unique high electrical conductivity and numerous potential applications including rechargeable batteries, antistatic coatings, electromagnetic screens, anticorrosive materials and sensors. Among the conducting polymers, polyaniline attracts greater attention because of its chemical stability under ambient conditions, high electrical conductivity, and simple synthesis [1]. A derivative of polyaniline, aminophenols are interesting electrochemical materials since, unlike aniline and other substituted anilines, they have two groups (¨CNH2 and ¨COH) which can be oxidized. Therefore, they can show electrochemical behavior resembling anilines and phenols. In polymerization of aminophenol, the relative position of amino and hydroxyl group is important [2]. In recent years, electrical, optical, and dielectric properties of conducting polymers like polyaniline and substituted polyaniline synthesized by chemical oxidation polymerization have been studied in great detail. Impedance spectroscopy is a very useful technique in solid state electronic system, because it can resolve the conduction components by differentiating between the transports properties of complex systems [3]. The behavior of AC conductivity according to the frequency and the temperature generally follows
%U http://www.hindawi.com/journals/jpol/2014/827043/