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Curing reaction of epoxy resins with diamines
Author(s) -
Riccardi C. C.,
Adabbo H. E.,
Williams R. J. J.
Publication year - 1984
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.1984.070290805
Subject(s) - autocatalysis , curing (chemistry) , epoxy , activation energy , differential scanning calorimetry , diglycidyl ether , order of reaction , polymer chemistry , isothermal process , atmospheric temperature range , glass transition , reaction rate , materials science , standard enthalpy of reaction , chemistry , chemical engineering , bisphenol a , kinetics , thermodynamics , composite material , organic chemistry , catalysis , polymer , reaction rate constant , enthalpy , physics , engineering , quantum mechanics
The curing reaction of a commercial bisphenol A diglycidyl ether (BADGE) with ethylenediamine (EDA) was studied by differential scanning calorimetry. Different kinetic expressions were found with isothermal (low temperature range) and dynamic (high temperature range) runs. Two competitive mechanisms are shown to be present: an autocatalytic one (activation energy E = 14 kcal/mol) and a noncatalytic path characterized by a second‐order reaction with E = 24.5 kcal/mol. At low temperatures both mechanisms took place simultaneously, showing a significant decrease in the reaction rate after the gel point. At high temperatures only the noncatalytic reaction was present, without showing a noticeable rate decrease in the rubber region. Also, a third‐order dependence of the glass transition temperature on reaction extent is shown.