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Isothermal cure kinetics and thermodynamics of an epoxy–nickel–diamine system
Author(s) -
Ghaemy M,
Rostami AA,
Omrani A
Publication year - 2006
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.1949
Subject(s) - diglycidyl ether , thermodynamics , gibbs free energy , isothermal process , epoxy , materials science , kinetics , enthalpy , polymerization , curing (chemistry) , activation energy , chemistry , polymer , polymer chemistry , bisphenol a , composite material , physics , quantum mechanics
Abstract A study was conducted on the cure kinetics and thermodynamics of a nickel‐containing epoxy polymer obtained by the polymerization of diglycidyl ether of bisphenol A (DGEBA) with a nickel catalyst of diethylenetriamine (Dien) under isothermal condition. The apparent activation energy ( E a ) was determined for the whole conversion range by the model‐free iso‐conversional approach. Isothermal kinetic parameters were estimated using an autocatalytic cure mechanism proposed by Kamal. The model gives a good description of curing kinetics at various temperatures prior to the onset of vitrification. Using the rate constants from the kinetic analysis and transition state (TS) theory, thermodynamic parameters such as enthalpy, entropy and Gibbs free energy changes were also calculated. The thermodynamic functions were shown to be very sensitive parameters for evaluation of the cure reaction. Copyright © 2005 Society of Chemical Industry