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Isothermal cure of an epoxy/cycloaliphatic amine system. Vitrification and gelation
Author(s) -
Barral L.,
Cano J.,
López A. J.,
López J.,
Nogueira P.,
Ramírez C.
Publication year - 1995
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.1995.210380406
Subject(s) - diglycidyl ether , epoxy , vitrification , materials science , isothermal process , glass transition , bisphenol a , curing (chemistry) , activation energy , cyclohexane , polymer chemistry , composite material , chemical engineering , thermodynamics , polymer , chemistry , organic chemistry , medicine , physics , andrology , engineering
Times to gelation and times to vitrification during isothermal curing for the epoxy system diglycidyl ether of bisphenol A and 1,3‐bisaminomethyl‐cyclohexane were measured at different curing temperatures between 50 and 100°C. Gelation occurs around 56% conversion. Vitrification was determined from data curves of glass transition temperature, T g , versus curing time obtained from DSC experiments. The minimum and maximum T g determined for this epoxy system were T go = −37°C and T g∞ = 150°C. Values of activation energy of the epoxy/amine cure reaction of 58 kJ/mol and 49.5 kJ/mol were obtained from T g versus time shift factors and gel time measurements respectively. The isothermal time–temperature–transformation diagram has been established.