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Kinetics of a sterically hindered amine‐cured epoxy resin system
Author(s) -
Buckley Leonard,
Roylance David
Publication year - 1982
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760220306
Subject(s) - steric effects , amine gas treating , materials science , activation energy , epoxy , kinetics , fourier transform infrared spectroscopy , isothermal process , infrared spectroscopy , quenching (fluorescence) , polymer chemistry , chemistry , organic chemistry , thermodynamics , chemical engineering , composite material , fluorescence , physics , quantum mechanics , engineering
Fourier transform infrared spectroscopy (FT‐IR) and torsional braid analysis (TBA) were used to study the reaction of an epoxy resin system cured with a sterically hindered amine. Isothermal torsional braid analysis showed the apparent activation energy to be approximately 42 kJ/mol. The reaction kinetics were also considered from the unreacted freshly mixed condition and a partially reacted “B‐staged” condition using infrared spectroscopy, The B‐staged condition is unreactive and stable at room temperature due to the quenching of the primary amine reaction by the glassy structure and the steric hindrance of the secondary amine reaction. Apparent activation energies for these two conditions were found to be 49.4 kJ/mol and 49.0 kJ/mol respectively. The storage life at room temperature of the B‐staged resin system is predicted to be at least three months based on extrapolation of the experimental kinetic data.