Azomethine-based phenol polymer: Synthesis, characterization and thermal study


DOĞAN F. , KAYA İ. , Bilici A.

SYNTHETIC METALS, cilt.161, ss.79-86, 2011 (SCI İndekslerine Giren Dergi) identifier identifier

Özet

Azomethine-based phenol polymer, poly-2-{[(6-aminopyridin-2-yl)imino]methyl}-phenol (PAPIMP), was synthesized through the combination of condensation reaction and oxidative polymerization. Polymer isolated from aqueous solution was characterized by UV-vis, FT-IR, NMR and TG, SEC analysis. According to the SEC chromatograms, the number-average molecular weight (M(n)), weight-average molecular weight (M(w)) and polydispersity index (PDI) values of PAPIMP were determined to be 33,550, 78,900 g mol(-1) and 2.352, respectively. Also, optical band gaps (E(g)) of APIMP and PAPIMP calculated from cyclic voltammetry (CV) measurements. Also, electrical conductivities of each component measured with four-point probe technique. TG analysis showed that PAPIMP was stable up to 300 degrees C. The thermal decomposition kinetics of PAPIMP was investigated by means of thermogravimetric analysis in dynamic nitrogen atmosphere at four different heating rates: 5, 10, 15 and 20 degrees C min(-1) The apparent activation energies for thermal decomposition of PAPIMP were obtained by Tang, Flynn-Wall-Ozawa (FWO), Kissenger-Akahira-Sunose (KAS) and Coats-Redfern methods (CR) were 96.97, 105.33, 97.28 and 88.60 kJ mol(-1), respectively; the mechanism function and pre-exponential factor were determined by master plots method. The most likely decomposition process was a D(n) Deceleration type in terms of the Coats-Redfern and master plots results. (C) 2010 Elsevier B.V. All rights reserved.