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Modification of a two‐component system by introducing an epoxy‐reactive diluent: Construction of a time–temperature–transformation (TTT) diagram
Author(s) -
Núñez Lisardo,
Villanueva M.,
Núñez M. R.,
Rial B.,
Fraga L.
Publication year - 2004
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.20122
Subject(s) - diluent , epoxy , differential scanning calorimetry , diglycidyl ether , materials science , isothermal process , activation energy , curing (chemistry) , polymer chemistry , bisphenol a , polymerization , thermodynamics , chemical engineering , composite material , chemistry , nuclear chemistry , polymer , physics , engineering
Curing reactions of a three‐component system consisting of an epoxy resin diglycidyl ether of bisphenol A (DGEBA n = 0), 1,2‐diaminecyclohexane as curing agent, and vinylcyclohexene dioxide as a reactive diluent were studied to calculate a time–temperature–transformation isothermal cure diagram for this system. Differential scanning calorimetry (DSC) was used to calculate the vitrification times. DSC data show a one‐to‐one relationship between T g and fractional conversion α, independent of cure temperature. As a consequence, T g can be used as a measure of conversion. The activation energy for the polymerization overall reaction was calculated from the gel times obtained using the solubility test (58.5 ± 1.3 kJ/mol). This value was similar to the results obtained for other similar epoxy systems. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 92: 1190–1198, 2004