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Calorimetric and rheological characterization of a high‐performance epoxy curable at low temperatures
Author(s) -
Rocks J,
Halter M,
George G,
Vohwinkel F
Publication year - 2003
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.1285
Subject(s) - rheology , curing (chemistry) , epoxy , isothermal process , materials science , thermodynamics , kinetics , homogeneous , activation energy , polymer chemistry , composite material , chemistry , physics , quantum mechanics
Curing and gelation of N , N , N ′, N ′‐tetraglycidyl‐ 4,4′ ‐diaminodiphenylmethane (TGDDM, Araldite ® MY721) in the presence of an anhydride hardener mixture were studied by calorimetric and dynamic rheological measurements. The cure kinetics of the homogeneous and low‐temperature‐curable epoxy system were evaluated from 40 to 140 °C, and the apparent activation energies of the curing reaction were calculated from different thermokinetic models. By comparison of different calorimetric and rheological methods, it was found that the results from the isothermal calorimetric measurements are in good agreement with the results obtained from isothermal rheological experiments, while the kinetic parameter calculations based on dynamic calorimetric measurements are not reliable results. These differences mainly arise from the fact that dynamic measurements have many underlying assumptions and do not consider the equilibrium condition. Copyright © 2003 Society of Chemical Industry