Dynamic cure kinetics of epoxy resins using an amine‐containing borate as a latent hardener |
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| Authors: | Qiao Yan Liu Jin Bin Chen Shu Mei Liu Jian Qing Zhao |
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| Affiliation: | 1. College of Materials Science and Engineering, South China University of Technology, 510640, Guangzhou, China;2. Key Laboratory of Polymer Processing Engineering, Ministry of Education, South China University of Technology, Guangzhou 510640, China |
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| Abstract: | 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 Ea associated with the cure reaction at different reaction stages. Copyright © 2012 Society of Chemical Industry |
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| Keywords: | epoxy resins latent hardeners cure kinetics differential scanning calorimetry |
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