Synthesis, Characterization and Thermal Degradation Kinetics of Polyazomethineester


A new polyester containing diimine ring, poly(imino isophthaloyl imino (glyoxal bis(2-methyl-4-hydroxy phenyl)imin)) poly[IPIGI] was synthesized by an Interfacial polycondensation reaction. The structure of poly[IPIGI] was confirmed by FT-IR and solid state 13C NMR techniques. The thermal stability was tested by TG-DTA and solubility was also studied. The kinetics of the thermal degradation of poly[IPIGI] was investigated by thermogravimetric analysis at different heating rates. TG curves showed that the thermal decomposition of poly[IPIGI] occurred in two stages. The apparent activation energies of thermal decomposition for poly[IPIGI], as determined by the Tang method (TM), the Flynn-Wall-Ozawa method (FWD), the Kissenger-Akahira-Sunose method (KAS) and the Coats-Redfern method (CR) are 74.8, 75.2, 76.5 and 83.9 kJ mol-1 for the first stage decomposition and 143.1, 143.7, 147.0 and 156.2 kJ mol-1 for the second stage decomposition, respectively. The mechanisms of each stage decomposition were also investigated by master plots.


Materials Science and Engineering

Keywords and Phrases

carbon 13; imine; poly[imino isophthaloylimino[glyoxal bis(2methyl 4 hydroxyphenyl)imin]]; polyester; polymer; unclassified drug; carbon nuclear magnetic resonance; chemical structure; degradation; infrared spectroscopy; isomerism; kinetics; nuclear magnetic resonance; synthesis; thermal analysis; thermogravimetry; thermostability

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Article - Journal

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© 2008 Indian Chemical Society, All rights reserved.

Publication Date

01 Oct 2008

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