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Kinetic and thermodynamic studies of the isothermal curing reaction of the diglycidyl ether of bisphenol A/Ni(II) chelate system
Author(s) -
Ghaemy M.,
Omrani A.,
Rostami A. A.
Publication year - 2005
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.22059
Subject(s) - diglycidyl ether , curing (chemistry) , activation energy , epoxy , bisphenol a , autocatalysis , fourier transform infrared spectroscopy , polymer chemistry , isothermal process , reaction rate constant , order of reaction , chemistry , reaction rate , materials science , ether , chemical engineering , kinetics , thermodynamics , organic chemistry , catalysis , physics , quantum mechanics , engineering
The curing reaction of a system consisting of a diglycidyl ether of bisphenol A (DGEBA) based epoxy and a new inorganic complex curing agent based on Ni(II) chelate with ethylendiamine (en) as a ligand was studied with an isothermal Fourier transform infrared (FTIR) technique. The hardener was prepared and characterized by means of FTIR spectroscopy, elemental analysis, and ICP–plasma techniques. The results of kinetic studies with two kinetic models, Horie et al. and Kamal, showed that the Kamal method gave the best fit to the experimental data. The overall values of the rate constants and activation energy for the DGEBA/Ni(en) 3 Br 2 system were calculated. The activation energy of the curing process was also determined by an isoconversional method, which showed that with the progress of curing time, the activation energy increased. Further, the results obtained from thermodynamic studies give the entropy change of activation, which was more negative for the n th‐order path, whereas the activation heat of the reaction was more negative for the autocatalytic path. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 98: 1540–1547, 2005