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Competitive primary amine/epoxy and secondary amine/epoxy reactions: Effect on the isothermal time‐to‐vitrify
Author(s) -
Wang Xiaorong,
Gillham John K.
Publication year - 1991
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.1991.070431216
Subject(s) - epoxy , diglycidyl ether , isothermal process , amine gas treating , bisphenol a , materials science , curing (chemistry) , polymer chemistry , reaction rate constant , fourier transform infrared spectroscopy , kinetics , chemistry , composite material , thermodynamics , organic chemistry , chemical engineering , physics , quantum mechanics , engineering
The effect of temperature on the ratio of the kinetic rate constants, k 2 / k 1 , has been investigated using FTIR spectroscopy for the competing reactions of epoxy with secondary amine (k 2 ) and primary amine groups (k 1 ) in a trimethylene glycol di‐ p ‐aminobenzoate/diglycidyl ether of the bisphenol A system. The ratio of the rate constants increases from 0.16 to 0.33 in the temperature range 100−160°C. The corresponding difference in the activation energies for the competing reactions is about 3.7 kcal/mol. The effect of the ratio on the time‐to‐vitrify contour of the isothermal time–temperature–transformation (TTT) cure diagram is discussed: The effect is more significant at higher curing temperatures.