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Dynamic cure kinetics of epoxy resins using an amine‐containing borate as a latent hardener
Author(s) -
Liu Qiao Yan,
Chen Jin Bin,
Liu Shu Mei,
Zhao Jian Qing
Publication year - 2012
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.4165
Subject(s) - epoxy , differential scanning calorimetry , fourier transform infrared spectroscopy , curing (chemistry) , diglycidyl ether , materials science , activation energy , boric acid , polymer chemistry , kinetics , arrhenius equation , amine gas treating , bisphenol a , chemical engineering , chemistry , organic chemistry , composite material , thermodynamics , physics , quantum mechanics , engineering
An amine‐containing borate (labeled NBD) was obtained by a one‐step esterification using neopentyl glycol, boric acid and N , N ‐dimethylethanolamine (DMEA) as reactants, and nuclear magnetic resonance as well as Fourier transform infrared (FTIR) measurements were used to characterize its chemical structure. The thermally latent curing properties of NBD were confirmed by differential scanning calorimetry (DSC), FTIR and gelation time results. The cure processes of bisphenol A diglycidyl ether epoxy resins (E51) using NBD as a latent hardener in comparison with a common hardener, DMEA, were studied by DSC measurements. The Avrami and Arrhenius methods as well as the Horowitz‐Metzger method were used to calculate kinetic parameters. These methods also revealed a transition at which the cure reaction mechanism showed a marked change and provided the apparent activation energy E a associated with the cure reaction at different reaction stages. Copyright © 2012 Society of Chemical Industry