University of agribusiness and rural development, Regional development of Central and Eastern European countries

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A novel tri-functional polyaren: synthesis and characterization
Fatih Doğan, Gülen Türker, Ali Bilici, İsmet Kaya

Last modified: 2015-10-12

Abstract


Conducting polymers containing different functional groups have received increasing attention in the last decade, due to wide application area including corrosion protection systems (Meneguzzi et al., 2001), pH sensors (Xu et al.,1995), or electrochromic devices (Schmitzand et al., 1195). The characteristics of polyarens arouse from the presence of three various functional groups (such as ─NH2, ─OH and ─SO3H) in their structure. The chemical oxidative polymerization of these kinds of monomers has been scarcely reported up to now. In this study, we reported the facile and template-free oxidative synthesis of 6-amino-2-hydroxy-naphthalene-4-sulfonic acid (a tri-functional monomer). The polymerization was performed in aqueous alkaline medium. We also aimed to investigate the kinetic parameters related to the solid state decomposition of the resulting polymer. In order to the calculation of the solid state degradation kinetics we used the TG-DTG and DTA data from ambient temperature to 1000 0C in nitrogen atmosphere. From TG-DTG curves it was clearly understood that the thermal decomposition occurred in one stages. CR (Coats et al., 1964), HM (Horowitz et al., 1963), MC (MacCallum et al., 1970), vK (Van Krevelen, 1951), MKN (Madhusudanan et al., 1993) and WHYC (Wanjun et al., 1993) methods based on single heating rates were used to investigate the thermal decomposition behavior of the resulting polymer. The kinetic parameters are the activation energy E, frequency factor A, reaction order n. We calculated the thermodynamic parameters such as entropy change ΔH, enthalpy change ΔS and Gibbs free energy ΔG, related to the thermal decomposition. The activation energy values from so-called the methods were very close with each other. The mean activation energy of the thermal decomposition was found to be about 100 kJ/mol.

Keywords


activation energy; 6-amino-2-hydroxy-naphthalene-4-sulfonic acid; thermal decomposition

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