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Thermal scanning rheometric analysis of curing kinetic of an epoxy resin. I. An anhydride as curing agent
Author(s) -
Ampudia J.,
Larrauri E.,
Gil E. M.,
Rodríguez M.,
León L. M.
Publication year - 1999
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/(sici)1097-4628(19990222)71:8<1239::aid-app4>3.0.co;2-u
Subject(s) - curing (chemistry) , diglycidyl ether , epoxy , materials science , activation energy , rheometry , order of reaction , bisphenol a , differential scanning calorimetry , isothermal process , polymer chemistry , kinetics , composite material , reaction rate constant , chemical engineering , chemistry , polymer , organic chemistry , thermodynamics , physics , quantum mechanics , engineering
The curing reaction of the system diglycidyl ether of bisphenol A (DGEBA), an organic anhydride (HMTPA), as curing agent and a tertiary amine (DMP 30) as initiator has been studied by Thermal Scanning Rheometry (TSR) under isothermal conditions. The gel time, which is defined by several different criteria, has been found to be a good parameter to determine the activation energy of this curing process; on the other hand, the gel time depends on the concentration of the initiator. An empirical model has been used to predict the change in viscosity (η*) of the system with time until the gelation is reached; the first‐order kinetics, the apparent kinetic constant ( k ′), and the activation energy before gelation have been determined. Furthermore, these results are reported together with the reaction mechanism proposed by another authors. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 71: 1239–1245, 1999